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    Pickering Emulsions Stabilized by Rice Peptide Aggregate-Chitosan Complexes: Stability, Interfacial Characteristics, and Gastrointestinal Digestion

    Year: 2023

    Authors: Yang, Zhenyu; Kong, Zhihao; Qiao, Xin; Li, Zhiying; Zhang, Liwen; Dai, Lei; Wang, Yanfei; Sun, Qingjie; McClements, David Julian; Xu, Xingfeng

    Keywords: Chitosan; Interfacial properties; emulsion stability; rice peptides aggregate

    Insoluble peptide precipitates formed by proteolysis of rice glutelin are usually discarded or used as animal feed, leading to significant resource waste. In this study, insoluble peptide precipitates were used to fabricate rice peptide aggregates (RPAs). The structure, interfacial behavior, micro-rheology, emulsion stability, and in vitro gastrointestinal digestion properties of Pickering emulsions coated with RPA-chitosan (RPA-CS) complexes were investigated. When the chitosan concentration increased from 0.2% to 0.6%, the size and contact angle of samples increased. The RPA-CS complexes adsorbed to oil-water interfaces. The thickness of the films formed at hydrophobic surfaces was between 1.4 and 3.1 nm depending on complex composition. RPA-CS complexes emulsions had better storage stability, slower digestibility, and higher curcumin bioaccessibility than RPA emulsion. This study showed that a low-value insoluble peptide precipitate could be used as a valuable functional ingredient in foods, which may increase the economics and sustainability of the food supply.
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