Optimization of Enzymatic Hydrolysis Process of Pueraria Protein by Response Surface Methodology and Its Antioxidant Properties in Vitro

Objective: To optimize the enzymatic hydrolysis process of Pueraria protein and study its antioxidant properties. Methods: DPPH radical scavenging ability and DH were used as the index to screen the best hydrolytic protease. Base on the single factor experiments, the Box-Behnken response surface design was used to optimize the enzymatic hydrolysis process of Pueraria protein, and the antioxidant properties of the optimum hydrolysate in vitro was analyzed. Results: The optimal hydrolysis conditions for alkaline protease were as follows: Temperature 55 ℃, pH9 and enzyme substrate ratio 2%. Under these conditions, the IC50 of DPPH·, ABTS+·, and ·OH radicals were 0.15, 0.38, 1.41 mg/mL and a reduction capacity of 0.553. Conclusion: Under these conditions, Pueraria protein hydrolysate had remarkable antioxidant properties.