Abstract: In this paper the peanut protein hydrolysates obtained with aqueous enzymatic process were concentrated by nanofiltration. At the conditions of pressure drop 0.9MPa and temperature 35℃, the protein concentration of the peanut protein hydrolysates is increased from 30.2 to 92.1g/L after 60min concentration. The reducing power, the antioxidative activity, the radical·OH and DPPH scavenging activities and the ACE inhibitory activity of the peanut protein hydrolysates were studied. The results showed that the peanut protein hydrolysates have the property of reduction, and the antioxidation in lecithin liposome system is very good. They have the function of both hydroxyl radicals activites and DPPH scavenging activities. The peanut protein hydrolysates have also the ACE inhibiting activity.

Key words: peanut protein hydrolysis, nanofiltration, antioxidative activity, scavenging activity, ACE(angiotonsin congverting enzyme)