Journal
JOURNAL OF FOOD ENGINEERING
Volume 357, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jfoodeng.2023.111626
Keywords
SPI-TA; Combination; Emulsion; Oxidation; Digestion
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The combination of plant protein and polyphenol compounds is an effective strategy to improve the stability of protein emulsions. This study focused on the interaction between soy protein isolate (SPI) and tannic acid (TA) and studied their physicochemical properties and application in O/W emulsions. The results showed that the main non-covalent interaction between SPI and TA was hydrogen bond and van der Waals force. TA improved the emulsifying ability and reduced the interfacial tension of SPI, resulting in a stable emulsion with inhibited lipid digestion and oxidation.
The combination of plant protein and polyphenol compounds is an effective strategy to improve the ability of this protein stabilized emulsion. However, the influence of interaction between protein and polyphenol complex on the emulsion was unclear. Therefore, this study took soy protein isolate (SPI) and tannic acid (TA) as the research object, systematically studied the interaction mechanism, physicochemical properties and application in O/W emulsion. The results showed that the main non-covalent interaction was hydrogen bond and van der Waals force of SPI-TA. The addition of TA changed the secondary structure and reduced the surface hydrophobicity of SPI. In terms of functional properties, TA improved the emulsifying ability and reduced the interfacial tension of SPI. In addition, SPI-TA complex, as a complex emulsifier, could form a stable emulsion, which inhibited the speed and extent of oil oxidation and lipid digestion. Our research results could provide some help for the elaboration of the interaction mechanism of SPI-TA and the preparation of antioxidant emulsions.
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