Influence of pH and (-)-Epigallocatechin-3-gallate on Chemical Stability of β-Carotene Emulsions

被引：0
|
作者：
Liu L. [1 ]
Chen L. [1 ,2 ]
Ma Y. [3 ]
Gao Y. [4 ]
Li H. [1 ,5 ]
Yang H. [1 ,2 ]
机构：
[1] Brand Food R&D Center, COFCO Nutritionand Health Research Institution, Beijing
[2] Beijing Engineering Laboratory for Geriatric Nutrition Food Research, Beijing
[3] School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin
[4] College of Food Science and Nutritional Engineering, China Agricultural University, Beijing
[5] Beijing Key Laboratory of Nutrition and Health and Food Safety, Beijing
来源：
Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery | 2019年 / 50卷 / 01期
关键词：
(-)-epigallocatechin-3-gallate; Chemical stability; Emulsion; PH value; β-carotene;
D O I：
10.6041/j.issn.1000-1298.2019.01.038
中图分类号：
学科分类号：
摘要：
β-Carotene is used as a precursor of vitamin A with potent antioxidant activity through singlet oxygen quenching and deactivation of free radicals. Nevertheless, the chemical instability of β-carotene limits its utilization as a nutraceutical ingredients in food industry. Tea polyphenols are often regarded as a highly effective antioxidant for some food applications. Antioxidants such as (-)-epigallocatechin-3-gallate (EGCG) can play dual role in lipid oxidation in oil-in-water emulsions in that it can scavenge free radicals but can also reduce transition metals to make them more prooxidative. Therefore, it is important to test the effect of EGCG on β-carotene degradation before it was used in foods. The chemical properties of β-carotene emulsions were characterized, which were stabilized by α-lactalbumin (α-LA) at different pH values with EGCG as antioxidant. β-Carotene concentration and color during storage as well as interfacial EGCG concentration of the emulsions were measured. EGCG can inhibit β-carotene degradation in emulsions at both pH values. After 7 d storage, the percentage of β-carotene remained in the emulsions at pH value of 2.0 without EGCG and with 0.500 0% EGCG was 50.45% and 89.37%, respectively. When the maximum concentration of EGCG (0.100 0%) was added to the emulsion at pH value of 7.0, 93.48% of the total β-carotene remained after 7 d storage. The color was changed by EGCG addition in emulsions at pH value of 7.0, however, EGCG had no effect on the color of emulsions at pH value of 2.0. The concentration of interfacial EGCG was higher in the emulsions at pH value of 7.0 than that in the emulsions at pH value of 2.0 which can result in higher β-carotene remaining rate in the emulsions at pH value of 7.0. © 2019, Chinese Society of Agricultural Machinery. All right reserved.
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页码：339 / 345
页数：6
相关论文
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