In order to improve the utilization value of peanut meal and develop healthy and safe peanut pep-tide functional foods,peanut protein was extracted by alkaline extraction and acid precipitation,and peanut antioxidant peptides were prepared by alkaline protease enzyme,and the preparation process was optimized by one-way test,Plackett-Burman test,and response surface test,and the compositions and structures be-fore and after the enzyme digestion were determined,and their antioxidant stability was evaluated by simu-lating gastrointestinal tract digestion in vitro.The results showed that the optimal conditions for the prepara-tion of peanut antioxidant peptides were pH 9.5,at the temperature of 50 ℃,alkaline protease addition of 6 100 U/g,substrate concentration of 4％,and treatment for 4 h.The ABTS radical scavenging rate of the peanut antioxidant peptides prepared under these conditions was up to 90.31％±0.53％,and the degree of hydrolysis was up to 35.06％±1.29％,with no significant difference with the predicted values.The antiox-idant activity of peanut peptide prepared by this process was increased by about 50％compared with that of peanut protein;the peanut peptide still maintained high antioxidant activity after simulated digestion in vitro.The results provide a theoretical basis for the efficient preparation of peanut antioxidant peptides and the promotion of the application of peanut meal in food processing industry.
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