In this study, rice bran albumin (RBA), sweet potato leaf polyphenols (SPLPs) and dextran were conjugated through covalent or non-covalent interactions to improve the stability and bioaccessibility of astaxanthin (AST) in emulsion systems. It was shown that the RBA-SPLPs-Dex ternary covalent complex demonstrated higher polysaccharide grafting, looser secondary structure, and exposed hydrophobic groups indicating that they were favourable for emulsion stabilisation. In long-term storage tests, RBA-SPLPs emulsifier modified by 50 mg/mL dextran (Dextran50) showed smaller particle size and cream index, respectively. Besides, the retention of loaded astaxanthin was improved by 59.43 % compared to the unmodified model, along with a strengthened inhibition of lipid oxidation in the storage experiment. Besides, Dextran50 also improved the environmental stress stability of the emulsion and demonstrated more efficient AST release behaviour during intestinal digestion. In conclusion, these emulsion systems stabilised with ternary complexes have great potential for the delivery of lipid-soluble bioactive ingredients.
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| http://dx.doi.org/10.1016/j.foodchem.2025.143276 | DOI Listing |
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