Introduction

Essential oils (EO) have received considerable awareness in the area of food preservation since they generally act as a natural antimicrobial through high lethality against an extensive assortment of microbes and also have potential health benefits.¹ EO are volatile molecules which are obtained from different plant parts as secondary metabolites. Due to the volatile and aromatic nature, EO has been utilized for flavoring the foods.² Nourishment well being has constantly been on spotlight because of proceeded with events of foodborne diseases caused by pathogenic infections and bacteria.³ Despite the enlargement of novel techniques and advancements, starting late the occurrence of foodborne contaminations is not decreasing.⁴ Therefore, actions are as yet expected to viably control the pathogenic microorganisms and to enhance the sustenance security. For the preservation of food, the conventional techniques incorporate drying out, warm treatment, antimicrobials, water movement, pH and changed environment are still generally utilized in various food manufacturing plants.⁵ Throughout the previous 30 years, hurdle technology has been progressively created and utilized everywhere throughout the world.⁶ Among many preservation methods, food antimicrobials assume a noteworthy part in inhibiting thedevelopment of pathogenic microbes. Therefore, they can be composed as artificially prepared or normally occurring antimicrobials.⁷ In another study by Satyal et al.,(2017) EO from both, garlic (Allium sativum) and wild garlic (Allium vineale) which is the another sort of garlic approximately used as its additional flavoring agents in different food stuffs.⁸ The use of numerous caused antimicrobials in nourishments which are esters as well as some organic acids (e.g. acetic acid derivations, benzoic acid,and benzoates) have been permitted by some organizations.⁹ Compared with natural and manufactured antimicrobials, isolated from animals and plants sources  which are more attractive to fulfill customer requirements for natural food.¹⁰ Some of the biopolymers that are extensively used areanimal-basedorigins like chitosan, which have antimicrobials properties. EO are a tremendous accumulation of various plant root antimicrobials; natamycin formed by microscopic organisms which are observed as bacteriocins.¹¹ Nanoemulsions are actively stable emulsions in which surfactant molecules are used to stabilize water and oil phases by reducing their surface tension and sometimes using co-surfactant.¹² Nanoemulsions serve as attractive target conveyance methods which are mostly utilized in food, pharmaceutical and cosmetic industries.¹³ There are numerous remunerations for using nanoemulsions having high stability and low turbidity rate which makes them attractive delivery systems.¹⁴ Due to reduced droplet size nanoemulsions are more prominent.¹⁵ The interesting physicochemical belongings of nanoemulsion leads to use in different fields like medicine, agriculture, food, cosmetics, drug and diagnostics treatments.¹⁶ Nanoemulsions capably add to support the application of EO in food products by expanding their dispersibility in the sustenance areas where the microbes develop and multiply by decreasing the effect, and in addition by increasing their antimicrobial action.¹⁷

Properties of Essential Oil

Composition of the Essential Oil

EO comprise around 20-60 compounds which are unsaturated hydrocarbons oxygenated. They are for the most part constituted by 85% major compounds and variety of other trace compounds, respectively.¹⁸ The major compounds which actas an antimicrobial agent can be characterized by their constituent resemblances, for example, aldehydes, terpenes,and phenols.¹⁹ In cinnamon bark oil, cinnamaldehyde is a major constituent which is an aldehyde.²⁰ Terpenes can be organized by their atomic structural configuration into different forms like cyclic, monoterpenes, diterpenes such as the essential part of the lavender oil i.e., linalool. Linalool contains monoterpene alcohols that showed high antimicrobial activity. The monoterpenes,menthol, and terpinenolare present in mint and tea tree oils.²¹ Fragrant mixes in clove, oregano and thyme oils which incorporate several phenolic compounds like thymol, carvacrol, and eugenolarevery effective due to the presence of antimicrobial actions.²² Both alcohols and phenols have activities that generally perceived by the proximity of hydroxyl group.The structural variation and chemical composition of plant derived compounds like ketones, esters and terpenes is enormous and therefore, the impact of antimicrobial action they produce against microorganisms depends on their structural configuration.²³

Modes of Actions of Essential Oil

The actual mechanism of EO based antimicrobial activity are as yet not clear, even though a few methods of activities have been studied.²⁴ A summed up display is related with the hydrophobic impression of EO mechanisms, which empower them to go into the cell film, aggravating the structure and expanding its penetrability, and therefore due to increased permeability, there is the release of cell content happens,²⁵ for instance,nucleic acids, amino acids, particles,and ATP. Different EO and their mixes which may act in a few different ways against various microorganisms.²⁶ For instance, carvacrol, a noteworthy phenolic compound in oregano and thyme oil, can disturb the external layer of different sorts of gram-negative microscopic organisms discharges endotoxins and furthermore builds the film penetrability.²⁷ It has been examined that carvacrol caused the loss of potassium particles from Bacillus cereus by trading its hydroxyl gathering and consequently diminishes intracellular ATP level adjacent to through the expansion of extracellular ATP on Escherichia coli.²⁸ Eugenol, a principle segment in clove oil and proficient to block the development of a few catalysts, for example, amylase in Bacillus cereus.²⁹ It likewise revealed for the anticipation of enzymatic activity in some gram-negative microbes like Klebsiellapneumoniae by authoritative to proteins with its hydroxyl group.³⁰ An aldehyde constituent of cinnamon oil is cinnamaldehyde, not quite the same as phenols, did not decay the cell wall or reduce the intra cellular ATP. However, it caused partial membrane disruption due to the out flow of small ions, and showed the activity of amino corrosive decarboxylases in Klebsiellapneumoniae which was caused by the binding energy between carbonyl and proteins group.³¹

Antimicrobial Activity of Plant-Based Essential Oil

The EO constituents and their antimicrobial activities are generally utilized as a part of preservatives in foods, therapies and in pharmaceuticals.³² Many EO are extremely effected against a wide series of microbes including some main foodborne pathogens (e.g. Listeria monocytogenes, Staphylococcus aureus, Salmonella enteritidis, and Campylobacter jejuni).³³ EO from thyme, geranium, oregano, clove and black pepper exhibited different inhibitory properties against 25 microorganisms which include both animal and plant-based pathogens moreover like spoilage bacteria in food poisoning.³⁴ Among these tested oils, thyme oil showed the extensive range of action, followed by oregano and clove.³⁵ In another study, cinnamon and clove oils both were analyzed and observed to be correspondingly effective against the microbes which cause food illness.³⁶ Furthermore, lemon and peppermint oil both showed more significant antimicrobial action against Bacillus cereus when contrasted with gram-negative bacteria. These EO constituents likewise have afar-reaching variety that happens in antimicrobial action when used independently or more viable in assortment because of some synergistic antimicrobial effects.³⁷

Stability and Challenges of Essential Oil in Foods

The higher antimicrobial viability of EO and their segments are mostly perceived by the nature of  hydrophobicity.³⁸ Due to its hydrophobic nature they are not dissolvable in water, and decreasing their antimicrobial capability when consolidated in food items.³⁹ Moreover, the adequate supplements existing in foodstuffs may permit the injured cells to improve earlier in correlation with the growth media.⁴⁰ For instance, low or no antimicrobial effectiveness against Listeriamonocytogenes were accounted for when EO were utilized on beef.⁴¹ Higher focuses upto 100-overlay more prominent of EO are required to acquire viable antimicrobial capability in nourishments as acontrast with growth media.⁴² Higher application of EO might be cause organoleptic issues due to the fact that EO can clearly influence the taste and sort of sustenance and make them improper.^{43, 44} Therefore it is required to develop some conveyance systems for EO promising techniques to get the high antimicrobial productivity of EO in nourishments.

Essential Oil for Delivery Systems       

Plant-Based Essential Oil Source for Nanoemulsion Formulation

The preparation of nanoemulsion by the utilization of plant oils is cheap, readily scalable and environment-friendly. Nanoemulsion is comprised of two immiscible phase, oil, and anaqueous phase, while the size of nanoemulsion droplets ranges from 10-100 nm.⁴⁵ They are optically translucent and thermodynamically very unstable means phase separation occurs eventually in given sufficient time.⁴⁶ Hence due to composed of very small droplet globules that are much more kinetically stable as associated with the macroemulsions contrast to coalescence, flocculation,and sedimentation.⁴⁷ Consequently, EO are frequently carried in nanoemulsions to acquire high stability relatively than the macroemulsions. The nanoemulsions which are made up of different plant-based oils by the use of nonionic surfactant are very safe, biocompatible and having high stability.³⁵ The surfactant chosen must be able to lower interfacial tension to a very small value to assist dispersion process during the preparation of the nanoemulsion.⁴⁸

The “Ultrasonication” and “High-pressure homogenization” are the mainly used approaches for nanoemulsion formation with plant oils. After one pass with microfluidizer and with ultrasonication (> 20 KHz) for about 5 minutes,the minimum size of the droplet was achieved in both the process.⁴⁹ The evidenceis also provided that more passes or increased sonication time would be effective to reduce the size of thedroplet further, similar size propagations were reported by means of both methods. Preparations of nanoemulsions by use of microfluidizer is not a convenient approach due to high-pressure usages and elongated time for emulsion formation.⁵⁰ A rigid location of shearing forces around the single extreme force is produced by microfluidizer, and by the use of sonication water and oil breaks into smaller droplets with the help of widely distributed forces exerted by sonicator. Uncountable droplets of the emulsion are formed due to increased emulsification.⁵¹ The preparation of nanoemulsion from plant oils with the usage of the ultrasonication method was developed which is novel for food grade nanoemulsion fabrication.⁵² From several other studies the convention for the improvement of thyme and lemon oil based nanoemulsions, the microfluidization techniques have been suggested.⁵³ Similarly, Donsi et al., in 2012, formulated nanoemulsions by use of homogenizer with extended pressure having a mixture of EO which contain d-Limonene and carvacrolto boost antimicrobial strength that has 154.6 nm droplet size.⁵⁴ The differences in droplet globule measure in these two techniques is because of different EO and their atomic structure, centralization of volatile compounds, consistency, and surfactant affinity.⁵⁵ The impact of charged surfactant towards the improvement of droplets of nanoemulsion and its impact was accounted with employment of thyme oil nanoemulsions on various pathogens related to food born diseases.⁵⁶

In phase separation, the development of nanoemulsions was observed to be particularly unstable which was inclined to Ostwald ripening for the reason of high solubility of water in oil. Accordingly, this may perhaps be restricted through corn oil which contains ripening inhibitor having oil phase.Vegetable oils, when used as a ripening inhibitor for emulsions,results in larger droplet size.⁵⁷ In reality, during homogenizati on there is increase in the viscosity of oil phase and therefore higher forces are applied to interrupt the oil which produces tiny droplet.⁵⁸ Another group formulated nanoemulsions with 120nm droplet sizes by means of oils having very high viscosity and nanoemulsionss howed the droplet size about 80nm which were by the use of oils having low viscosity.⁵⁹ For the maximum part, the preparation of oils from the plantare of low thickness due to the proximity of compounds having low subatomic weight and contain unsaturated fatty acids. Ongoing investigations have demonstrated an improvement in the substance and physicalproperties of nanoemulsions loaded by EO as compared to the formulations made by conventional methods.⁶⁰ The ongoing attempt was made towards the known mechanism by which EO works against microbes. The slow movement of resolving this matter occurred due to following two reasons.The first reason is due to the complexity of the molecules contained in a mixture, preparative methods and its raw material composition. And the second reason is the hydrophobic nature of EO and its constitutes and protocols which are well standardized to access antimicrobials reported for molecules which are hydrophilic in nature.⁶¹

Correlation of Low Versus High Energy Techniques

A few scientists have discovered that in certain surfactant-oil-water frameworks high energy merhod create little droplet sizes than low energy techniques. For instance, when utilizing orange and grape seed oil, emulsions made with a microfluidizer were little than those made in similar conditions utilizing spontaneous emulsification.⁶² Furthermore, an extensively higher grouping of surfactant is required to create practically alike molecule measure. In an investigation of 20 % medium chain triglycerides oil-in-water emulsions, it was discovered that a little mean droplet range less than 100 nm could be accomplished with a surfactant-to-oil proportion with a similar framework using spontaneous emulsification.⁶³ When contrasting with emulsion phase inversion method, a surfactant-to-oil ratio higher than 0.7 was required to accomplished a particle directs comparable toward microfluidization surfactant-to-oil proportion at a 0.1.⁶⁴ This high measure of manufactured surfactant is inconvenient from a cost, taste and threat view. High energy techniques require considerably less surfactant to accomplish little droplet size as compared to phase inversion method.⁶⁵ Every framework may should be explored to decide whether a high or low energy strategy would be more suitable.

Advantages of Low Energy Techniques

There are numerous circumstances in which low-energy techniques might be favored over high-energy strategies. For example, if the primary capital cost of high energy equipment might be too vast to survive, low-energy techniques might be the arrangement.⁶⁶ Moreover, in specific circumstances the real disadvantage of the low energy methods high utilization of manufactured surfactants might be inundated by making dilutions of original emulsion, e.g., in drinks where the final oil and surfactant fixations are low (< 0.1%).⁶³ Besides, some bioactive mixes can’t be fabricated by utilizing high-energy strategies because of the rise in temperature caused by the high measure of energy.⁶⁴ There are certain solutions for this, for example, the utilization of ice to incorporate a homogenizer, however these cooling strategies will eventually contribute more to the expense of utilizing high-energy techniques.⁶⁷ In these cases, isothermal strategies might be helpful to illustrate that are warm delicate since no high temperatures are required.

Disadvantages of Low Energy Techniques

While low energy strategies have a few points of interest over high energy techniques, the kinds of oils and emulsifiers that can be utilized regularly restrain them. Previous investigations recommend that medium chain triglycerides are the best sort of oils to use to frame nanoemulsions utilizing low energy techniques.⁶⁸ Generally by low energy methods it’s hard to create little droplet utilizing long chain triglycerides, which restricts this technique for some applications, e.g., fish oils.  It is in some cases conceivable to conquer this issue by blending long chain triglycerides oils with different oils like flavored oils that encourage nanoemulsion improvement.⁶⁹ The solubility of oil increases with diminishing droplet measure so expansive droplet develop to the drawback of littler ones. As of now, low-energy techniques have just been appeared to work with synthetic  surfactants, for example, Tweens and Spans.⁷⁰ Generally high convergences of these synthetic surfactants are required to formulate nanoemulsions  which could be limited only for some applications like taste, health safety and financial reasons.⁷¹

Nanoemulsions Arranged with Surfactants

It has been by and large enumerated that the surfactant blends are ordinarily more capable than particular uses for innumerable applications,⁷² especially when a lipophilic and hydrophilic surfactant, for example, Span in addition to Tween are mixed, and it is frequently investigated.⁷³ These surfactant mixes use synergism of hydrophilic and lipophilic properties of different surfactants. Surfactant mixes can decrease the size of the droplet and increment the inflexibility and quality of interfacial layer by adjusting of surfactant atoms through controls, for example, hydrogen bonding.⁷⁴ The combination of Tween 40 with Span 20 was seen to be accomplished by delivering ideal mineral oil emulsions.⁷⁵ The lipophilic tail of Tween 40 infiltrates between the adsorbed Span 20 particles that are more oil dissolvable, and the interlinking chains of Tween 40 which are hydrophilic in nature may shaped a gel-like structure in the aqueous phase to diminish coalescence of droplet.⁷⁶ The mixed surfactant frameworks have moreover been analyzed in the creation of nanoemulsions to get more alluring properties in nourishment, pharmaceutical as well as in cosmetics. For illustration, nanoemulsions arranged to utilize just sucrose monopalmitate, a non-ionic nourishment review surfactant, was extraordinarily variable to the collectionat low pH, which constrained its uses in different items.⁷⁷ The control of lemon oil nanoemulsions was enhanced by blending Tween 80 with sucrose monopalmitate. Stable nanoemulsions shaped utilizing surfactant which can more often than not be acquired by changing the surfactant composes and their proportions depend upon its blending properties.⁷⁸ At the moment that oil-in-water emulsions were set up with mixes containing one hydrophilic surfactant Tween 80 and one lipophilic surfactant Span 80.⁷⁹ The blend of Tween and Span 80 demonstrated the best synergistic result in resolving nanoemulsions.⁸⁰

Natural Emulsifying Agents

A lot of surfactants which are synthetic based like mono-and diacylglycerols, has been delivered and approximately utilized as a piece of nutrition based items because of their compact surface activity.⁸¹ However, as customers turn out to be more stressed over the potential harmful properties of synthetic food based substances.⁸² Some natural derived biopolymers like polysaccharides and proteins which have amphiphilic structures generally used as an emulsifying specialist. Example of normal emulsifying agents, for example, as follows

Proteins

The plant and animal-based proteins, e.g. whey protein and casein which is milk based,and gelatin have been much of the time used to streamline the advancement and enhancing the faithfulness of sustenance emulsions.⁸³ These proteins with contains higher measure of non-polar gatherings, are prepared to do quickly retaining to oil-water limits and formed layers which are electrically charged throughout homogenization technique.⁸⁴ Some steric repulsion are given by interfacial layers, whereas the huge component used to avoid electrostatic repulsive  flocculation in globule.⁸⁵ Whey proteins, an important manufactured result regained from cheddar and paneer that have been customarily utilized as sustenance on account of their exceptional useful and supporting belongings.⁸⁶ Whey protein fixings are included β lactoglobulin and α-lactalbumin whereas cow like serum egg whites and some minor constituents, for instance, immunoglobulins.⁸⁷ β-lactoglobulin and α-lactalbumin, make up around 70-80% of entire whey protein which was responsible for handy properties, for instance, emulsifying and foaming properties. Whey protein fixings are includedβ-lactoglobulin, α-lactalbumin, cow-like serum egg whites,and minor components, like- immunoglobulins.⁸⁷ They make up around 70-80% of whole protein which was in charge of useful associated properties, for example, emulsifying and frothing properties.⁸⁸ Constituents of whey proteins contains >90% protein, is ordinarily used as an emulsifier for the advancement of oil-in-water nanoemulsions.⁸⁹ A vital drawback of whey protein-offset emulsions is the denaturation of the globular proteins over an unmistakable temperature and the subsequent droplet globule formation.⁹⁰ To enhance heat device, whey proteins can be combined with decreasing saccharides for example by Maillard response.⁹¹ Sodium caseinate (NaCas) the most habitually used regular emulsifying operators in the nourishment based ventures due to the recognized emulsifying properties is sodium caseinate.⁹² It is created from drain through consequent developments of the isoelectric point of caseins, equilibrium of the accelerated casein with NaOH, or by spray drying.⁹³ The NaCas is made out of four kinds of caseins: α1-, α2-, β-, caseins. β and α1-caseins declare to more than 75% of the aggregate protein and are unaffected surface dominant components.⁹⁴ Unlike as of globular proteins, for example, the structure of casein is intensely confused in whey proteins, which empowers their quick ingestion on oil globule sides through emulsification process.⁹⁵ The creation of animpenetrable coating (up to 10 nm) of caseins and the solid electrostatic forces which can adequately secure the globules against coalescence as well flocculation. Besides, NaCas-balanced out emulsions have a higher heat equilibrium yet are more penetrating to low pH (underneath 4.5).⁹⁶ Gelatin is one more class of proteins by means of numerous useful properties like blending, frothing, developing, and utilized in the nourishment applications.⁹⁷ The structure of the protein is straight with extremely higher sub-atomic weight i.e ~ 40,000 to 90,000 Da.⁹⁸ Gelatin is conveyed by breakdown of animal-based collagens from bovine at acidic or soluble pH.⁹⁹ Individually , An isoelectric point where pH of different gelatins is pH ~7-9 and pH~5, which create them using innumerable charges at an equivalent pH which results in different applications. As an emulsifying agent, gelatin is equipped for encouraging the alteration of emulsions.¹⁰⁰ Some examinations have shown that the plan of emulsions with gelatin had by and large broad atom appraise and was not astoundingly stable.¹⁰¹ Hence, gelatin was regularly hydrophobically adjusted or utilized as a bit of blend with various biopolymers, for instance, gelatin and whey protein to update it’s emulsifying and balancing out properties.¹⁰²

Phospholipids

These are natural, highly surface-dynamic composites generally utilized for the arrangement of nourishment emulsions.¹⁰³ The typically utilized emulsifiers in phospholipids contains phosphatidyl choline (PC)which is best known for emulsion stabilization.¹⁰⁴ Lecithin is a basic combination of innumerable phospholipids and different mixes, for example, starches, unsaturated fats,and triglycerides.¹⁰⁵ Lecithin is an average ordinary emulsifier with a few well being focal points and consequently broadly surely understood by users. Industry-based lecithin is typically developed from vegetables based oil seeds (e.g. soybeans and sunflower seeds).¹⁰⁶ Soybean is the essential well spring of vegetable lecithin and soy lecithin is isolated from the synthesis of soybean oil.¹⁰⁷ PCs, known as the most nutritious important lipid which is the fundamental constituents in soy lecithin.¹⁰⁸ It has been regularly utilized independently or joined with different emulsifiers for improving emulsion stability.¹⁰⁹

Polysaccharides

The polysaccharides additionally have resolving properties in nourishment applications, for example dessert and sauces.^{110, 111} Mostly, polysaccharides are successful in controlling emulsion time duration of usability, however just a pair of polysaccharides, e.g. gum arabic, some gelatin and galactomannans can be used as emulsifiers.¹¹² Contrasting proteins, polysaccharides are less delicate towards the pH, and thus emulsions become stable with the help of polysaccharides at a wide pH extend. Gum arabic, which is acquired from the common excretion of Acacia Senegal, a stand out among the most widely utilized polysaccharide emulsifiers in the foodstuff based industries, particularly in enhance drink emulsions because of its noble emulsifying properties and having exceptional low viscosity.¹¹³ It is a compound stretched hetero polyelectrolyte and made out of no less than three distinctive high nuclear weight biopolymer portions having arabinogalactan, glycoprotein, and arabinogalactan-protein complex.¹¹⁴ The arabinogalactan-protein complex, containing a couple of polysaccharide units associated with a common protein center which is accepted to be tremendously liable for the surface-movement of gum arabic.¹¹⁵ The hydrophobic protein chain can immovably assimilate to oil globules surface and the hydrophilic arabinogalactan separations reach out previously to  aqueous resolution, protection of  globules from flocculation through strong steric hindrance.¹¹⁶

Antimicrobial Activity of Plant Oil Based Nanoemulsions

The usage of nanoemulsion as an antimicrobial agent is another and promising development. The nanoemulsion is stable when combining with lipid-containing microorganisms. This type of combination hence is improved by the electrostatic attraction among the particles of emulsion which possesses acationic charge and anionic charge on the surface of the pathogen.¹¹⁷ At that point when enough nano emulsions combine through the microbes, they discharge some portion of the vitality caught inside the emulsion. Both the dynamic fixing and the vitality discharged destabilize the pathogen lipid film, bringing about cell lysis.¹¹⁸ The nanoemulsion has an inclusive assortment of the movement against microbe e.g. Staphylococcus aureus, Escherichiacoli, viruses like HIV, Herpes simplex, parasites e.g. candida, dermatophytes, and spores e.g., Bacillus anthracis. The examination concerning about the application of nanoemulsion as an antimicrobial factor was activated through the well-known issue of enhancement of antimicrobial safe strains experienced with the use of existing operators because of the extensive predominant, utilization of anti-infection agents, disinfectants and cleaning agents.¹¹⁹ These disadvantages explains additionally innovative work of new antimicrobial factors which has been focusing on particular pathogens while being alright for the host.¹²⁰ Since the system of action of nanoemulsions seems, by all accounts, to be the non-particular interruption of bacterial cell layers, nanoemulsions would not bring about the improvement of safe strains. Utilization of nanoemulsion as an antimicrobial specialist is a promising and new development. The utilization of EO as common antimicrobial specialists has as of late pulled in critical consideration for food waste and other pathogenic microorganisms.¹²¹ A wide range of utilization of nanoemulsions have been accounted for incorporating additives in case of food, pesticide transmission in agrochemicals formulation and antimicrobial agents used as disinfectants.To create and deliver EO nanoemulsions in pharmaceutics and food based industries as antimicrobials require a low measure of surfactant as well as oil used in low concentration.¹²² Due to the fine size of droplets and having characteristic property of not to clearly disseminate light these nanoemulsions are widely utilized in food items prepared in industries.¹²³ Similarly a few reports on oils like eugenol, thymol,andterpene as nanoemulsions was also reported for improved delivery of antimicrobials.¹²⁴ The various plant-based oils of peppermint, clove, and thyme loaded nanoemulsion was additionally showed antimicrobial activity against an extensive variety of gram negative and gram positive microbes.¹²⁵ The fundamental oil based nanoemulsions shows higher antibacterial efficacy as compared to the pure oil. The EO loaded nanoemulsions being used in food systems was previously reported. In 2005, Holley and Patel discussthe use of EO nanoemulsionson fresh and cooked meats, handled foods and various vegetables items as bactericidal agents.¹²⁶ It has been discovered that the nanoemulsion is utilized in low quantity in food items as compared to the pure oil. The eugenol which contains nano-based surfactant micelles which shows a decline in the growth of microbial count which was tested in different media.¹²⁷ Bhargava et al., (2015) contemplated nanoemulsions formulated of oregano oil,having 148 nm size of droplet which potentiallydecreases the microorganism number of various microbes like Listeria monocytogenes, Escherichia coli, and Salmonella typhimurium. They proposed that the promising carriage of safer nanoemulsions was another option to manufactured synthetic chemical usage.¹²⁸ The omega-3 unsaturated fatty acids have low solubility in water and it was used to formulate the nanoemulsions with improved bioavailability made them appropriate to use in nourishment and strengthening agents in many drinks.¹²⁹ On the basis of Food grade, carvacrolnanoemulsion was produced for its viability and studied contaminated with bean seeds which were studied against Salmonella enteritidis and Escherichia coli.The antimicrobial nanoemulsions totally inactivated the microorganisms than the conventional formulations. Kim et al., in the year 2013 proposed that the oil-containing lemongrass on plum coated nanoemulsions exhibited higher immovability than uncoated ones placed at 4ºC and the inhalation rate of plum was also reduced during the storage conditions.¹³⁰ These coated plums showed higher activity against Salmonella enteritidis and Escherichia coli which helps in prolonging the mean life of the plum. The palm and pomegranate seed oil based nanoemulsions have been utilized for treatment of neurode generative and meningitis disorders.¹³¹ The imperative vector of a few tropical sicknesses, including intestinal sickness, and other parasitic infections such as filariasis and yellow fever. The mechanism of mosquitoes globally is done basically on supported utilizations of manufactured larvicides i.e. organophosphates (e.g. temephos) and bug development controllers (e.g. diflubenzuron, methoprene, and so forth.).¹³² These larvicides are observed to be extremely powerful in mosquito larval control. Be that as it may, the dreary utilization of these larvicides has energized a few well beings and natural worries by flare-ups of other irritation species and advancement of opposition.¹³³ These worries have featured the condition for the advancement of new techniques to control mosquito hatchling. The plant-based nanoemulsions have regular pesticidalaction, because of essential bioactive constituents that charge ofthe movements. The harmful impact of formulated pesticides on the earth can be decreased by utilizing nano-based pesticides.¹³⁴ The water-in-oil eucalyptus oil nanoemulsion indicates potential antibacterial action against Proteus mirabilis.¹³⁵ The formulation of EO based nanoemulsion with different surfactants and their targeted microbes has been shown in (table 1).

Table 1: Essential Oil Loaded Nanoemulsions with their Targeted Microorganisms

The preparation of nanoemulsion was based upon eucalyptus oil developed with the help of high energy methods forms smaller droplet size which would exhibit higher rates of antibacterial action than eucalyptus oil alone. As of late, for controlling vector-borne infections against Culexquinquefasciatus by utilizing nanoemulsion formulated with neem oil will be of good option with the manufactured pesticides.¹⁴⁴ The use of citronella oil nanoemulsion arranged by high-weight homogenization, was discussed in comparison to the droplet size stability and in vivo mosquito defense.¹⁴⁵ Recently there is an expanded in enthusiasm for utilizing EO or structured emulsion systems for specific functional applications. The enclosing action of these EO with the rate of different biopolymers, for example, polysaccharides, proteins, and starch have been accounted for the slow and sustained release of the bioactive substances.¹⁴⁶ It has remained showed on the application of emulsion-based delivery systems for lipophilic ingredients like flavors, fat-soluble supplements and antimicrobial EO.¹⁴⁷ Mustard oil and mustard oil-based formulations also exhibited the antibacterial activity.¹⁴⁸ Mustard oil is tested to have chemo-preventive impacts on theadvancement of colon tumor Mustard flours have been supplemented in the combination for making rusks which helps to improve nutritional and textural qualities and furthermore as a food additive.¹⁴⁹ Nanoemulsions based cinnamon oil displaying high antimicrobial movement against Escherichia coli by utilizing the low energy approach. Besides, cinnamon oil nanoemulsion has been accounted for to effectively restrain development of Bacillus cereus.¹⁵⁰ There is budding eagerness inside the food and drink items for the usage of nanoemulsions as colloidal passage frameworks for the deliverance of bioactive mixes, which includes antimicrobials, flavors, nutrients, and nutraceuticals. Nanoemulsions fill in as colloidal passage specialists for lipophilic bioactive assortments as flavoring agents in the nourishment, drug delivery in the pharmaceutics and as a vehicle for skincare agents.^{151, 152}

Conclusion

The article features the prospective of nanoemulsions with plant-based EO that efficiently deliver the antimicrobial compounds. Nanoemulsion formulation is considered as a functional behavior for food stuffs because of their increased surface area and small droplet size. Nanoemulsions can be fabricated by using different emulsifiers which act as antimicrobial preservation for improving the food safety. Consequently, the delivery systems of EO loaded nanoemulsions in food offers various benefits, regarding essential oil effect on natural action, physicochemical equilibrium and in product behavior. In an account, the essential oil based nanoemulsions show higher antimicrobial properties due to non-phospholipid-based, inexpensive, stable, non-toxic, antimicrobial agents that may have clinical applications.

Acknowledgments

We are very thankful to Shoolini University for encouragement and facilities provided to complete the work.

References

1. Davidson P. M. Food antimicrobials: Back to nature. InI International Symposium on Natural Preservatives in Food Systems 709. 2005 Mar 30. 29-34.
2. El Asbahani A., Miladi K., Badri W., Sala M., Addi E.A., Casabianca H., El Mousadik A., Hartmann, D., Jilale A., Renaud F.N., Elaissari A. Essential oils: from extraction to encapsulation. International journal of pharmaceutics. 2015;483(1-2):220-243.
   CrossRef
3. McCabe-Sellers B. J., Beattie S. E. Food safety: emerging trends in foodborne illness surveillance and prevention. Journal of the American Dietetic Association. 2004;104(11):1708-1717.
   CrossRef
4. Centers for Disease Control and Prevention. Foodborne Disease Active Surveillance Network (FoodNet) [(accessed on 15 June 2013)].
5. Rahman M. S. Food Preservation. InHandbook of Food Preservation, Second Edition 2007 Jul 16 .14-29. CRC press.
6. Leistner L. Basic aspects of food preservation by hurdle technology. International journal of food microbiology. 2000;55(1-3):181-186.
   CrossRef
7. López-Malo A., Alzamora S. M., Guerrero S. Natural antimicrobials from plants. Minimally Processed Fruits and Vegetables. Fundamentals Aspects and Applications. 2000:237.
8. Satyal P., Craft J. D., Dosoky N. S., Setzer W. N. The chemical compositions of the volatile oils of garlic (Allium sativum) and wild garlic (Allium vineale). Foods. 2017;6(8):63.
   CrossRef
9. Davidson P. M., Taylor T. M., Schmidt S. E. Chemical preservatives and natural antimicrobial compounds. InFood microbiology. American Society of Microbiology. 2013;765-80
10. Davidson P., Taylor T., Doyle M., Beuchat L. Chemical peservatives and natural antimicrobial compounds. Food microbiology: Fundamentals and frontiers. 2007;713-745.
11. Tiwari B.K., Valdramidis V. P., O’Donnell C. P., Muthukumarappan K., Bourke P., Cullen P. J. Application of natural antimicrobials for food preservation. Journal of agricultural and food chemistry. 2009;57(14):5987-6000.
    CrossRef
12. Tadros T., Izquierdo P., Esquena J., Solans C. Formation and stability of nano-emulsions. Advances in colloid and interface science. 2004;108:303-318.
    CrossRef
13. Kong M., Park H. J. Stability investigation of hyaluronic acid based nanoemulsion and its potential as transdermal carrier. Carbohydrate polymers. 2011;83(3):1303-1310.
    CrossRef
14. Thiagarajan P. Nanoemulsions for drug delivery through different routes. Research in Biotechnology. 2011;2(3).
15. Li P. H., Chiang B. H. Process optimization and stability of D-limonene-in-water nanoemulsions prepared by ultrasonic emulsification using response surface methodology. Ultrasonicssonochemistry. 2012;19(1):192-197.
    CrossRef
16. Silva H. D., Cerqueira M. Â., Vicente A. A. Nanoemulsions for food applications: development and characterization. Food and Bioprocess Technology. 2012;5(3):854-867.
    CrossRef
17. Donsì F., Annunziata M., Sessa M., Ferrari G. Nanoencapsulation of essential oils to enhance their antimicrobial activity in foods. LWT-Food Science and Technology. 2011;44(9):1908-1914.
    CrossRef
18. Bakkali F., Averbeck S., Averbeck D., Idaomar M. Biological effects of essential oils–a review. Food and chemical toxicology. 2008;46(2):446-475.
    CrossRef
19. Ceylan E., Fung D. Y. Antimicrobial activity of spices 1. Journal of Rapid Methods & Automation in Microbiology. 2004;12(1):1-55.
    CrossRef
20. Thormar H. editor. Lipids and essential oils as antimicrobial agents. John Wiley & Sons; 2010 Dec 28.
21. Hüsnü K., Başer C., Demirci F. Chemistry of essential oils. InFlavours and Fragrances. 2007;43-86. Springer, Berlin, Heidelberg.
22. Burt S. Essential oils: their antibacterial properties and potential applications in foods—a review. International journal of food microbiology. 2004;94(3):223-253.
    CrossRef
23. Modzelewska A., Sur S., Kumar S. K., Khan S. R. Sesquiterpenes: natural products that decrease cancer growth. Current Medicinal Chemistry-Anti-Cancer Agents. 2005;5(5):477-499.
    CrossRef
24. Lambert R. J., Skandamis P. N., Coote P. J., Nychas G. J. A study of the minimum inhibitory concentration and mode of action of oregano essential oil, thymol and carvacrol. Journal of applied microbiology. 2001;91(3):453-462.
    CrossRef
25. Sikkema J., de Bont J. A., Poolman B. Interactions of cyclic hydrocarbons with biological membranes. Journal of Biological Chemistry. 1994;269(11):8022-8028.
26. Lv F., Liang H., Yuan Q., Li C. In vitro antimicrobial effects and mechanism of action of selected plant essential oil combinations against four food-related microorganisms. Food Research International. 2011;44(9):3057-30564.
    CrossRef
27. Ultee A., Bennik M. H., Moezelaar R. The phenolic hydroxyl group of carvacrol is essential for action against the food-borne pathogen Bacillus cereus. Applied and environmental microbiology. 2002;68(4):1561-1568.
    CrossRef
28. Helander I. M., Alakomi H. L., Latva-Kala K., Mattila-Sandholm T., Pol I., Smid E. J., Gorris L. G., von Wright A. Characterization of the action of selected essential oil components on Gram-negative bacteria. Journal of agricultural and food chemistry. 1998;46(9):3590-3595.
    CrossRef
29. THOROSKI J., BLANK G., BILIADERIS C. Eugenol induced inhibition of extracellular enzyme production by Bacillus subtilis. Journal of Food Protection. 1989;52(6):399-403.
    CrossRef
30. Wendakoon C. N., Sakaguchi M. Inhibition of amino acid decarboxylase activity of Enterobacteraerogenes by active components in spices. Journal of Food Protection. 1995; 58(3):280-283.
    CrossRef
31. Gill A. O., Holley R. A. Mechanisms of bactericidal action of cinnamaldehyde against Listeria monocytogenes and of eugenol against L. monocytogenes and Lactobacillus sakei. Applied and environmental microbiology. 2004;70(10):5750-5755.
    CrossRef
32. Lis‐Balchin M., Deans S. G. Bioactivity of selected plant essential oils against Listeria monocytogenes. Journal of applied microbiology. 1997;82(6):759-762.
    CrossRef
33. Smith-Palmer A., Stewart J., Fyfe L. Antimicrobial properties of plant essential oils and essences against five important food-borne pathogens. Letters in applied microbiology. 1998;26(2):118-122.
    CrossRef
34. Dorman H. J., Deans S. G. Antimicrobial agents from plants: antibacterial activity of plant volatile oils. Journal of applied microbiology. 2000;88(2):308-316.
    CrossRef
35. Ziani K., Chang Y., McLandsborough L., McClements D. J. Influence of surfactant charge on antimicrobial efficacy of surfactant-stabilized thyme oil nanoemulsions. Journal of agricultural and food chemistry. 2011;59(11):6247-6255.
    CrossRef
36. Gupta C., Garg A. P., Uniyal R. C., Kumari A. Antimicrobial activity of some herbal oils against common food-borne pathogens. African journal of microbiology research. 2008;2(10):258-261.
37. García‐García R., López‐Malo A., Palou E. Bactericidal action of binary and ternary mixtures of carvacrol, thymol, and eugenol against Listeria innocua. Journal of food science. 2011;76(2):M95-100.
    CrossRef
38. Aureli P., Costantini A., Zolea S. Antimicrobial activity of some plant essential oils against Listeria monocytogenes. Journal of food protection. 1992;55(5):344-348.
    CrossRef
39. Tassou C. C., Drosinos E. H., Nychas G. J. Effects of essential oil from mint (Menthapiperita) on Salmonella enteritidis and Listeria monocytogenes in model food systems at 4 and 10 C. Journal of Applied Bacteriology. 1995; 78(6):593-600.
    CrossRef
40. Gill A. O., Delaquis P., Russo P., Holley R. A. Evaluation of antilisterial action of cilantro oil on vacuum packed ham. International journal of food microbiology. 2002;73(1):83-92.
    CrossRef
41. Uhart M., Maks N., Ravishankar S. Effect of spices on growth and survival of Salmonella typhimurium DT 104 in ground beef stored at 4 and 8C. Journal of Food Safety. 2006;26(2):115-125.
    CrossRef
42. Solomakos N., Govaris A., Koidis P., Botsoglou N. The antimicrobial effect of thyme essential oil, nisin, and their combination against Listeria monocytogenes in minced beef during refrigerated storage. Food microbiology. 2008;25(1):120-127.
    CrossRef
43. Gutierrez J., Barry-Ryan C., Bourke P. The antimicrobial efficacy of plant essential oil combinations and interactions with food ingredients. International journal of food microbiology. 2008;124(1):91-97.
    CrossRef
44. Gutierrez J., Barry-Ryan C., Bourke P. Antimicrobial activity of plant essential oils using food model media: efficacy, synergistic potential and interactions with food components. Food microbiology. 2009;26(2):142-150.
    CrossRef
45. Prakash A., Baskaran R., Paramasivam N., Vadivel V. Essential oil based nanoemulsions to improve the microbial quality of minimally processed fruits and vegetables: A review. Food Research International. 2018 May 29.
    CrossRef
46. Sharma N., Bansal M., Visht S., Sharma P. K., Kulkarni G. T. Nanoemulsion: A new concept of delivery system. Chronicles of Young Scientists. 2010;1(2):2.
47. Weiss J., Gaysinsky S., Davidson M., McClements J. Nanostructured encapsulation systems: food antimicrobials. InGlobal issues in food science and technology. 2009;425-479.
48. McClements D. J. Food emulsions: principles, practices, and techniques. 2015;CRC press.
    CrossRef
49. Tan S. F., Masoumi H. R., Karjiban R. A., Stanslas J., Kirby B. P., Basri M., Basri H. B. Ultrasonic emulsification of parenteral valproic acid-loaded nanoemulsion with response surface methodology and evaluation of its stability. Ultrasonicssonochemistry. 2016;29:299-308.
    CrossRef
50. Cook E. J., Lagace A. P. inventors; Biotechnology Development Corp, assignee. Apparatus for forming emulsions. United States patent US 4,533,254. 1985 Aug 6.
51. Mahdi Jafari S., He Y., Bhandari B. Nano-emulsion production by sonication and microfluidization—a comparison. International Journal of Food Properties. 2006;9(3):475-485.
    CrossRef
52. Ghosh V., Mukherjee A., Chandrasekaran N. Ultrasonic emulsification of food-grade nanoemulsion formulation and evaluation of its bactericidal activity. Ultrasonicssonochemistry. 2013;20(1):338-344.
    CrossRef
53. Rao J., McClements D. J. Food-grade microemulsions and nanoemulsions: Role of oil phase composition on formation and stability. Food hydrocolloids. 2012;29(2):326-334.
    CrossRef
54. Donsì F., Annunziata M., Vincensi M., Ferrari G. Design of nanoemulsion-based delivery systems of natural antimicrobials: effect of the emulsifier. Journal of biotechnology. 2012;159(4):342-350.
    CrossRef
55. McClements D. J. Edible nanoemulsions: fabrication, properties, and functional performance. Soft Matter. 2011;7(6):2297-2316.
    CrossRef
56. McClements D. J., Li Y. Structured emulsion-based delivery systems: controlling the digestion and release of lipophilic food components. Advances in colloid and interface science. 2010;159(2):213-228.
    CrossRef
57. Qian C., McClements D. J. Formation of nanoemulsions stabilized by model food-grade emulsifiers using high-pressure homogenization: factors affecting particle size. Food Hydrocolloids. 2011; 25(5):1000-1008.
    CrossRef
58. Håkansson A., Trägårdh C., Bergenståhl B. studying the effects of adsorption, recoalescence and fragmentation in a high-pressurehomogenizer using a dynamic simulation model. Food Hydrocolloids. 2009;23(4):1177-1183.
    CrossRef
59. Wooster T. J., Golding M., Sanguansri P. Impact of oil type on nanoemulsion formation and Ostwald ripening stability. Langmuir. 2008;24(22):12758-12765.
    CrossRef
60. Salvia-Trujillo L., Rojas-Graü M. A., Soliva-Fortuny R., Martín-Belloso O. Use of antimicrobial nanoemulsions as edible coatings: Impact on safety and quality attributes of fresh-cut Fuji apples. Postharvest Biology and Technology. 2015;105:8-16.
    CrossRef
61. Nychas G. J., Skandamis P. N., Tassou C. C. Antimicrobials from herbs and spices. InNatural antimicrobials for the minimal processing of foods. 2003;176-200.
62. Davidov-Pardo G., McClements D. J. Nutraceutical delivery systems: resveratrol encapsulation in grape seed oil nanoemulsions formed by spontaneous emulsification. Food chemistry. 2015;167, 205-212.
    CrossRef
63. Yang Y., Marshall-Breton C., Leser M. E., Sher A. A., McClements D. J. Fabrication of ultrafine edible emulsions: Comparison of high-energy and low-energy homogenization methods. Food Hydrocolloids. 2012;29(2):398-406.
    CrossRef
64. Ostertag F., Weiss J., McClements D. J. Low-energy formation of edible nanoemulsions: factors influencing droplet size produced by emulsion phase inversion. Journal of colloid and interface science. 2012;388(1):95-102.
    CrossRef
65. Mayer S., Weiss J., McClements D. J. Vitamin E-enriched nanoemulsions formed by emulsion phase inversion: factors influencing droplet size and stability. Journal of colloid and interface science. 2013;402:122-130.
    CrossRef
66. Patel R. P., Joshi J. R. An overview on nanoemulsion: a novel approach. International Journal of Pharmaceutical Sciences and Research. 2012;3(12):4640.
67. Yu L., Li C., Xu J., Hao J., Sun D. Highly stable concentrated nanoemulsions by the phase inversion composition method at elevated temperature. Langmuir. 2012;28(41):14547-14552.
    CrossRef
68. Wooster T. J., Golding M., Sanguansri P. Impact of oil type on nanoemulsion formation and Ostwald ripening stability. Langmuir. 2008;24(22):12758-12765.
    CrossRef
69. Guttoff M., Saberi A. H., McClements D. J. Formation of vitamin D nanoemulsion-based delivery systems by spontaneous emulsification: factors affecting particle size and stability. Food Chemistry. 2015;171:117-122.
    CrossRef
70. Roger K., Cabane B., Olsson U. Emulsification through surfactant hydration: the PIC process revisited. Langmuir. 2010;27(2):604-611.
    CrossRef
71. Piorkowski D. T., McClements D. J. Beverage emulsions: Recent developments in formulation, production, and applications. Food Hydrocolloids. 2014;42:5-41.
    CrossRef
72. Vilasau J., Solans C., Gómez M.J., Dabrio J., Mújika-Garai R., Esquena J. Phase behavior of a mixed ionic/nonionic surfactant system used to prepare stable oil-in-water paraffin emulsions. Colloids and Surfaces A: Physicochemical and Engineering Aspects. 2011;384(1-3):473-481.
    CrossRef
73. Fu Z., Liu M., Xu J., Wang Q., Fan Z. Stabilization of water-in-octane nano-emulsion. Part I: Stabilized by mixed surfactant systems. Fuel. 2010;89(10):2838-2843.
    CrossRef
74. Fox C. Rationale for the selection of emulsifying agents. Cosmetics and toiletries. 1986;101(11):25-44.
75. Gullapalli R. P., Sheth B. B. Influence of an optimized non-ionic emulsifier blend on properties of oil-in-water emulsions. European Journal of Pharmaceutics and Biopharmaceutics. 1999;48(3):233-238.
    CrossRef
76. Boyd J. V., Parkinson C., Sherman P. Factors affecting emulsion stability, and the HLB concept. Journal of Colloid and Interface Science. 1972;41(2):359-370.
    CrossRef
77. Rao J., McClements D. J. Food-grade microemulsions, nanoemulsionsand emulsions: Fabrication from sucrose monopalmitate& lemon oil. Food hydrocolloids. 2011;25(6):1413-1423.
    CrossRef
78. Rao J., McClements D. J. Lemon oil solubilization in mixed surfactant solutions: Rationalizing microemulsion& nanoemulsion formation. Food Hydrocolloids. 2012;26(1):268-276.
    CrossRef
79. Peng L.C., Liu C.H., Kwan C.C., Huang K.F. Optimization of water-in-oil nanoemulsions by mixed surfactants. Colloids and Surfaces A: Physicochemical and Engineering Aspects. 2010; 370(1-3):136-142.
    CrossRef
80. Imai Y., Ujiie N., Nakamura A., Koshinuma M., Tajima K. Three-phase structure of hexadecane nanoemulsion formed with phospholipid–surfactant mixtures and its novel phase transition temperature TE. Colloids and Surfaces A: Physicochemical and Engineering Aspects. 2006; 276(1-3):134-142.
    CrossRef
81. Hasenhuettl G. L., Hartel R. W. Editors. Food emulsifiers and their applications. New York: Springer; 2008 Apr 1.
    CrossRef
82. Norde W. Colloids and interfaces in life sciences. New York: Marcel Dekker; 2003 Jan.
83. McClements D. J. Protein-stabilized emulsions. Current opinion in colloid & interface science. 2004;9(5):305-313.
    CrossRef
84. Dickinson E. Hydrocolloids at interfaces and the influence on the properties of dispersed systems. Food hydrocolloids. 2003;17(1):25-39.
    CrossRef
85. Hu M., McClements D. J., Decker E. A. Lipid oxidation in corn oil-in-water emulsions stabilized by casein, whey protein isolate, and soy protein isolate. Journal of Agricultural and Food Chemistry. 2003;51(6):1696-1700.
    CrossRef
86. Ercelebi E. A., Ibanoğlu E. Influence of hydrocolloids on phase separation and emulsion properties of whey protein isolate. Journal of Food Engineering. 2007;80(2):454-459.
    CrossRef
87. Farrell Jr H. M., Jimenez-Flores R., Bleck G. T., Brown E. M., Butler J. E., Creamer L. K., Hicks C. L., Hollar C. M., Ng-Kwai-Hang K. F., Swaisgood H. E. Nomenclature of the proteins of cows’ milk—Sixth revision. Journal of dairy science. 2004;87(6):1641-1674.
    CrossRef
88. Klein M., Aserin A., Svitov I., Garti N. Enhanced stabilization of cloudy emulsions with gum Arabic and whey protein isolate. Colloids and Surfaces B: Biointerfaces. 2010;77(1):75-81.
    CrossRef
89. Sun C., Gunasekaran S., Richards M. P. Effect of xanthan gum on physicochemical properties of whey protein isolate stabilized oil-in-water emulsions. Food Hydrocolloids. 2007;21(4):555-64.
    CrossRef
90. Euston S. R., Finnigan S. R., Hirst R. L. Aggregation kinetics of heated whey protein-stabilized emulsions. Food Hydrocolloids. 2000;14(2):155-1561.
    CrossRef
91. Shah B., Ikeda S., Davidson P. M., Zhong Q. Nanodispersingthymol in whey protein isolate-maltodextrin conjugate capsules produced using the emulsion–evaporation technique. Journal of Food Engineering. 2012;113(1):79-86.
    CrossRef
92. Sánchez C. C., Patino J. M. Interfacial, foaming and emulsifying characteristics of sodium caseinate as influenced by protein concentration in solution. Food Hydrocolloids. 2005;19(3):407-416.
    CrossRef
93. Liu L., Zhao Q., Liu T., Kong J., Long Z., Zhao M. Sodium caseinate/carboxymethylcellulose interactions at oil-water interface: Relationship to emulsion stability. Food Chemistry. 2012; 132(4):1822-1829.
    CrossRef
94. Surh J., Decker E. A., McClements D. J. Influence of pH and pectin type on properties and stability of sodium-caseinate stabilized oil-in-water emulsions. Food Hydrocolloids. 2006;20(5):607-618.
    CrossRef
95. Dalgleish D. G., Srinivasan M., Singh H. Surface properties of oil-in-water emulsion droplets containing casein and Tween 60. Journal of Agricultural and Food Chemistry. 1995;43(9):2351-2355.
    CrossRef
96. Zhu D., Damodaran S., Lucey J. A. Physicochemical and emulsifying properties of whey protein isolate (WPI)− dextran conjugates produced in aqueous solution. Journal of agricultural and food chemistry. 2010;58(5):2988-2994.
    CrossRef
97. Karim A. A., Bhat R. Fish gelatin: properties, challenges, and prospects as an alternative to mammalian gelatins. Food Hydrocolloids. 2009;23(3):563-576.
    CrossRef
98. Djagny K. B., Wang Z., Xu S. Gelatin: a valuable protein for food and pharmaceutical industries. Critical reviews in food science and nutrition. 2001;41(6):481-92.100.
99. Baziwane D., He Q. Gelatin: the paramount food additive. Food Reviews International. 2003; 19(4):423-435.
    CrossRef
100. Lobo L. Coalescence during emulsification: 3. Effect of gelatin on rupture and coalescence. Journal of colloid and interface science. 2002;254(1):165-1674.
101. Dickinson E., Lopez G. Comparison of the emulsifying properties of fish gelatin and commercial milk proteins. Journal of food science. 2001;66(1):118-123.
     CrossRef
102. Taherian A. R., Britten M., Sabik H., Fustier P. Ability of whey protein isolate and/or fish gelatin to inhibit physical separation and lipid oxidation in fish oil-in-water beverage emulsion. Food Hydrocolloids. 2011;25(5):868-878.
     CrossRef
103. Cardenia., Waraho T., Rodriguez‐Estrada M. T., Julian McClements D., Decker E. A. Antioxidant and prooxidant activity behavior of phospholipids in stripped soybean oil‐in‐water emulsions. Journal of the American Oil Chemists’ Society. 2011;88(9):1409-1416.
     CrossRef
104. Nii T., Ishii F. Properties of various phosphatidylcholines as emulsifiers or dispersing agents in microparticle preparations for drug carriers. Colloids and Surfaces B: Biointerfaces. 2004;39(1-2):57-63.
     CrossRef
105. Oke M., Jacob J. K., Paliyath G. Effect of soy lecithin in enhancing fruit juice/sauce quality. Food research international. 2010;43(1):232-240.
     CrossRef
106. vanNieuwenhuyzen W., Tomás M. C. Update on vegetable lecithin and phospholipid technologies. European Journal of Lipid Science and Technology. 2008;110(5):472-486.
     CrossRef
107. Wu Y., Wang T. Soybean lecithin fractionation and functionality. Journal of the American Oil Chemists’ Society. 2003;80(4):319-326.
     CrossRef
108. Bylaite E., Nylander T., Venskutonis R., Jönsson B. Emulsification of caraway essential oil in water by lecithin and β-lactoglobulin: emulsion stability and properties of the formed oil–aqueous interface. Colloids and Surfaces B: Biointerfaces. 2001;20(4):327-340.
     CrossRef
109. Surh J., Jeong Y. G., Vladisavljević G. T. On the preparation of lecithin-stabilized oil-in-water emulsions by multi-stage premix membrane emulsification. Journal of food engineering. 2008; 89(2):164-170.
     CrossRef
110. Goff H.D. Colloidal aspects of ice cream—a review. International Dairy Journal. 1997; 7(6-7):363-373.
     CrossRef
111. Sikora M., Badrie N., Deisingh A. K., Kowalski S. Sauces,and dressings: a review of properties and applications. Critical reviews in food science and nutrition. 2008;48(1):50-77.
     CrossRef
112. Dickinson E. Hydrocolloids as emulsifiers and emulsion stabilizers. Food hydrocolloids. 2009; 23(6):1473-1482.
     CrossRef
113. Dickinson E., Galazka V. B., Anderson D. M. Emulsifying behaviour of gum arabic. Part 1: Effect of the nature of the oil phase on the emulsion droplet-size distribution. Carbohydrate Polymers. 1991;14(4):373-383.
     CrossRef
114. Islam A. M., Phillips G. O., Sljivo A., Snowden M. J., Williams P. A. A review of recent developments on the regulatory, structural and functional aspects of gum arabic. Food Hydrocolloids. 1997; 11(4):493-505.
     CrossRef
115. Ray A. K., Bird P. B., Iacobucci G. A., ClarkJr B. C. Functionality of gum arabic. Fractionation, characterization and evaluation of gum fractions in citrus oil emulsions and model beverages. Food Hydrocolloids. 1995;9(2):123-131.
     CrossRef
116. Chanamai R., McClements D. J. Depletion flocculation of beverage emulsions by gum arabic and modified starch. Journal of Food Science. 2001;66(3):457-463.
     CrossRef
117. Caillet S., Millette M., Salmieri S., Lacroix M. Combined effects of antimicrobial coating, modified atmosphere packaging, and gamma irradiation on Listeria innocua present in ready-to-use carrots (Daucuscarota). Journal of food protection. 2006;69(1):80-85.
     CrossRef
118. Donsì F., Ferrari G. Essential oil nanoemulsions as antimicrobial agents in food. Journal of biotechnology. 2016;233:106-120.
     CrossRef
119. Sagis L. M. editor. Microencapsulation and microspheres for food applications. Academic Press; 2015 Aug 10.
120. Di Pasqua R., Betts G., Hoskins N., Edwards M., Ercolini D., Mauriello G. Membrane toxicity of antimicrobial compounds from essential oils. Journal of agricultural and food chemistry. 2007; 55(12):4863-4870.
     CrossRef
121. de Sousa J. P., de Azerêdo G. A., de Araújo Torres R., da Silva Vasconcelos M. A., da Conceição M. L., de Souza E. L. Synergies of carvacrol and 1, 8-cineole to inhibit bacteria associated with minimally processed vegetables. International journal of food microbiology. 2012;154(3):1451-51.
     CrossRef
122. Buranasuksombat U., Kwon Y. J., Turner M., Bhandari B. Influence of emulsion droplet size on antimicrobial properties. Food Science and Biotechnology. 2011;20(3):793-800.
     CrossRef
123. McClements D. J. Nanoemulsions versus microemulsions: terminology, differences, and similarities. Soft matter. 2012;8(6):1719-1729.
     CrossRef
124. Kriegel C., Kit K. M., McClements D. J., Weiss J. Nanofibers as carrier systems for antimicrobial microemulsions. II. Release characteristics and antimicrobial activity. Journal of applied polymer science. 2010;118(5):2859-2868.
     CrossRef
125. Liang R., Xu S., Shoemaker C. F., Li Y., Zhong F., Huang Q. Physical and antimicrobial properties of peppermint oil nanoemulsions. Journal of agricultural and food chemistry. 2012;60(30):7548-7555.
     CrossRef
126. Holley R. A., Patel D. Improvement in shelf-life and safety of perishable foods by plant essential oils and smoke antimicrobials. Food Microbiology. 2005;22(4):273-292.
     CrossRef
127. Gaysinsky S., Davidson P. M., Bruce B. D., Weiss J. Growth inhibition of Escherichia coli O157: H7 and Listeria monocytogenes by carvacrol and eugenol encapsulated in surfactant micelles. Journal of food protection. 2005;68(12):2559-2566.
     CrossRef
128. Bhargava K., Conti D. S., da Rocha S. R., Zhang Y. Application of an oregano oil nanoemulsion to the control of foodborne bacteria on fresh lettuce. Food microbiology. 2015;47:69-73.
     CrossRef
129. Walker R., Decker E. A., McClements D. J. Development of food-grade nanoemulsions and emulsions for delivery of omega-3 fatty acids: opportunities and obstacles in the food industry. Food & function. 2015;6(1):41-54.
     CrossRef
130. Kim I. H., Lee H., Kim J. E., Song K. B., Lee Y. S., Chung D. S., Min S. C. Plum Coatings of Lemongrass Oil‐incorporating Carnauba Wax‐based Nanoemulsion. Journal of food science. 2013; 78(10):1551-9.
     CrossRef
131. Musa S. H., Basri M., Masoumi H. R., Karjiban R. A., Malek E. A., Basri H., Shamsuddin A. F. Formulation optimization of palm kernel oil esters nanoemulsion-loaded with chloramphenicol suitable for meningitis treatment. Colloids and Surfaces B: Biointerfaces. 2013;112:113-9.
     CrossRef
132. Mizrahi M., Friedman-Levi Y., Larush L., Frid K., Binyamin O., Dori D., Fainstein, Ovadia H., Ben-Hur T., Magdassi S., Gabizon R. Pomegranate seed oil nanoemulsions for the prevention and treatment of neurodegenerative diseases: the case of genetic CJD. Nanomedicine: Nanotechnology, Biology,and Medicine. 2014;10(6):1353-1363.
     CrossRef
133. Yang Y. C., Lee S. G., Lee H. K., Kim M. K., Lee S. H., Lee H. S. A piperidine amide extracted from Piper longum L. fruit shows activity against Aedesaegypti mosquito larvae. Journal of agricultural and food chemistry. 2002;50(13):3765-3767.
     CrossRef
134. Kumar R. S., Shiny P. J., Anjali C. H., Jerobin., Goshen K. M., Magdassi S., Mukherjee A., Chandrasekaran N. Distinctive effects of nano-sized permethrin in the environment. Environmental Science and Pollution Research. 2013;20(4):2593-2602.
     CrossRef
135. Saranya S., Chandrasekaran N., Mukherjee A. M. Antibacterial activity of eucalyptus oil nanoemulsion against Proteus mirabilis. International Journal of Pharmacy and Pharmaceutical Sciences. 2012;4(3):668-671.
136. Hamed S. F., Sadek Z., Edris A. Antioxidant and antimicrobial activities of clove bud essential oil and eugenol nanoparticles in alcohol-free Journal of oleo science. 2012;61(11):641-648.
     CrossRef
137. Baldissera M. D., Da Silva A. S., Oliveira C. B., Zimmermann C. E., Vaucher R. A., Santos R. C., Rech V. C., Tonin A. A., Giongo J. L., Mattos C. B., Koester L. Trypanocidal activity of the essential oils in their conventional and nanoemulsion forms: in vitro tests. Experimental parasitology. 2013; 134(3):356-3561.
     CrossRef
138. Shah B., Davidson P. M., Zhong Q. Nano-dispersing thymol for enhanced dispersibility and antimicrobial effectiveness against Escherichia coli O157: H7 and Listeria monocytogenes in model food systems. Applied and environmental microbiology. 2012 Sep 28:AEM-02225.
139. Orav A., Raal, Arak E. Essential oil composition of Pimpinellaanisum L. fruits from various European countries. Natural product research. 2008;22(3):227-232.
     CrossRef
140. Tozlu E., Cakir A., Kordali S., Tozlu G., Ozer H., Akcin T. A. Chemical compositions and insecticidal effects of essential oils isolated from Achilleagypsicola, Saturejahortensis, Origanumacutidens and Hypericumscabrum against broadbean weevil (Bruchusdentipes). Scientia Horticulturae. 2011; 130(1):9-17.
     CrossRef
141. Flores F. C., De Lima J. A., Ribeiro R. F., Alves S. H., Rolim C. M., Beck R. C., Da Silva C. B. Antifungal activity of nanocapsule suspensions containing tea tree oil on the growth of Trichophytonrubrum.Mycopathologia. 2013;175(3-4):281-286.
     CrossRef
142. Deena M.J., Thoppil J.E. Antimicrobial activity of the essential oil of Lantana camara. Fitoterapia. 2000;71(4):453-455.
     CrossRef
143. Ghotbi R. S., Khatibzadeh M., Kordbacheh S. Preparation of neem seed oil nanoemulsion. InProceedings of the 5th International Conference on Nanotechnology: Fundamentals and Applications, Prague, Czech Republic, Paper. 2014;150:11-13.
144. Anjali C. H., Sharma Y., Mukherjee A., Chandrasekaran N. Neem oil (Azadirachtaindica) nanoemulsion—a potent larvicidal agent against Culexquinquefasciatus. Pest management science. 2012;68(2):158-163.
     CrossRef
145. Sakulku U., Nuchuchua, Uawongyart N., Puttipipatkhachorn S., Soottitantawat A., Ruktanonchai U. Characterization and mosquito repellent activity of citronella oil nanoemulsion. International journal of pharmaceutics. 2009;372(1-2):105-111.
     CrossRef
146. Baranauskienė R., Venskutonis P. R., Dewettinck K., Verhé R. Properties of oregano (Origanumvulgare L.), citronella (Cymbopogonnardus G.) and marjoram (Majoranahortensis L.) flavors encapsulated into milk protein-based matrices. Food Research International. 2006; 39(4):413-425.
     CrossRef
147. McClements D. J., Decker E. A., Weiss J. Emulsion‐based delivery systems for lipophilic bioactive components. Journal of food science. 2007;72(8):109-24.
     CrossRef
148. Turgis M., Han J., Caillet S., Lacroix M. Antimicrobial activity of mustard essential oil against Escherichia coli O157: H7 and Salmonella typhi. Food control. 2009;20(12):1073-1079.
     CrossRef
149. Dwivedi C., Muller L. A., Goetz-Parten D. E., Kasperson K., Mistry V. V. Chemopreventive effects of dietary mustard oil on colon tumor development. Cancer letters. 2003;196(1):29-34.
     CrossRef
150. Li J. J., Zehentbauer G. N., Bunke P. R., Zent J. B., Ekanayake A., Kester J. J. Isogard ™ a natural anti-microbial agent derived from white mustard seed. InI International Symposium on Natural Preservatives in Food Systems 709. 2005;101-108.
151. Sonneville-Aubrun., Simonnet J. T., L’alloret F. Nanoemulsions: a new vehicle for skincare products. Advances in colloid and interface science. 2004;108:145-149.
     CrossRef
152. Martins J. T., Ramos O. L., Pinheiro A. C., Bourbon A. I., Silva H. D., Rivera M. C., Cerqueira M. A., Pastrana L., Malcata F. X., González-Fernández A., Vicente A.A. Edible bio-based nanostructures: delivery, absorption and potential toxicity. Food Engineering Reviews. 2015;7(4):491-513.
     CrossRef