Abstract
The purpose of this study was to explore the antioxidant activity in vivo of dual-enzyme hydrolysates obtained from defatted walnut, and to purify and identify it. The walnut protein hydrolysates (WPH) were obtained through two-step enzymatic hydrolysis of alkaline protease and trypsin. The effects of WPH on the oxidative stress-related biochemical indexes of d-galactose-treated mice were investigated. Next, WPH was passed through a Sephadex G-25 gel chromatography, anion exchange chromatography and Sephadex G-15 gel chromatography. Subsequently, peptides in the high antioxidant activity fraction were identified by RP-nano-HPLC–MS/MS. Finally, 14 potential peptides of length 11 AAs to 21 AAs with antioxidant activity were identified from WPH.
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