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Role of continuous phase protein, (−)-epigallocatechin-3-gallate and carrier oil on β-carotene degradation in oil-in-water emulsions

Author:
Liu, Lei, Gao, Yanxiang, McClements, David Julian, Decker, Eric Andrew
Source:
Food chemistry 2016 v.210 pp. 242-248
ISSN:
0308-8146
Subject:
beta-carotene, corn, corn oil, dose response, emulsions, functional foods, ingredients, lactalbumin, lipid peroxidation, medium chain triacylglycerols, polysorbates
Abstract:
The chemical instability of β-carotene limits its utilization as a nutraceutical ingredient in foods. In this research, the effect of continuous phase alpha-lactalbumin (α-LA) and (−)-epigallocatechin-3-gallate (EGCG) on β-carotene degradation in medium chain triacylglycerol (MCT)- and corn oil-in-water emulsions was examined. EGCG significantly inhibited β-carotene degradation in both MCT and corn oil-in-water emulsions in a dose dependent manner. α-LA was not able to protect β-carotene in MCT emulsions and the combination of EGCG and α-LA had a similar effect as EGCG alone. EGCG had no effect on lipid oxidation in corn oil-in-water emulsions but can protect β-carotene. β-Carotene was more stable in corn oil emulsions stabilized by α-LA compared to emulsions stabilized by Tween 20. These results show that EGCG is effective at protecting β-carotene in different emulsion systems without negatively impacting lipid oxidation suggesting that it could be utilized to increase the incorporation of β-carotene into food emulsions.
Agid:
5260801