Effects of Storage, Prepration and Heat Treatment on Water-Soluble Vitamins and Minerals of Sauropus Androgynous

Nguyen T. M. Nguyet *, Dang T. Thuy, Nguyen N. Tuan and Le P. T. Quoc

Institute of Biotechnology and Food Technology, Industrial University of Ho Chi Minh City, Nguyen Van Bao Street, Go Vap District, Ho Chi Minh City, Vietnam.

Corresponding Author Email: nguyenthiminhnguyet@iuh.edu.vn

Sauropus androgynous is a green leafy vegetable in Vietnam. The proximate main compositions (protein, lipid, ash, and fiber) in leaves were 24.05±0.87, 4.20±0.02, 8.74±0.24, 7.21±1.19% dry weight (DW). This study aimed to determine the change of water-soluble vitamins and minerals of this vegetable plant when stored in polythene bags at a temperature of 6.2±2.89 C and moisture 49±13.23% and thermal processing. Throughout the storage period, the sample assessment results by High-Performance Liquid Chromography (HPLC) method revealed that, except for vitamin B3, almost water-soluble vitamins of S. androgynous tend to lose around 50% of their weight after 8-days in the refrigerator. After two days of storage, vitamin B3 increased substantially (123.39±19.45 mg/100g DW versus 203.75±3.94 mg/100g DW), then decreased slightly after every two days. The modification of minerals determined by the inductively coupled plasma mass spectrometry IPC-MS method in S. androgynous plant leaves occurred similarly over 8 days of storage. All the plant leaves were boiled in water for 15 min at 90-100 C with two-way pretreatments: rub and non-rub the leaves. All analyzed vitamins and minerals have decreased, but no significant differences between samples were treated in two different ways before thermal processing concerning several vitamins and minerals.

Mineral; Sauropus androgynous; Storage; Thermal-processing; Water-soluble vitamin

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