This invention belongs to the field of
plant protein processing technology, and relates to a method for modifying sesame
protein based on endogenous polyphenols and its application. Using cold-pressed sesame cake as
raw material, after
defatting and pulverizing pretreatment, sesame
protein is extracted using an alkali-
dissolution-acid
precipitation method. The extraction time, temperature, material-to-
liquid ratio, and pH are optimized using single-factor experiments and
response surface methodology to induce non-covalent and covalent interactions between sesame endogenous polyphenols and protein, constructing a stable protein-
polyphenol complex system. Under optimized conditions,
sesamin and
sesamin can efficiently bind to protein, resulting in a
polyphenol content of 40-55 mg / 100 g, a protein purity of not less than 80%, and an extraction rate of not less than 35% in the modified sesame protein. Compared with dephenolized sesame protein, its molecular structure undergoes certain changes, and its
solubility, emulsifying properties, and
antioxidant properties are significantly improved. Specifically, the
solubility is not less than 40%, the emulsifying activity is 25-45 m² / g, the emulsifying stability is 60%-85%, and it exhibits good
scavenging ability against
DPPH and
ABTS free radicals, while also demonstrating superior colloidal stability and interfacial characteristics. This invention eliminates the need for exogenous
polyphenol addition, employs a green and efficient process, and yields modified sesame protein that can be used as a functional ingredient in highly stable emulsions, functional foods, and active substance delivery systems, thereby enhancing
system stability and
antioxidant properties.