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2,2-diphenyl-1-picrylhydrazyl radical (DPPH•) and hydroxyl radical (HO•) scavenging activity of protein hydrolysate (RSH) and its three fractions by ultrafiltration at the concentration of 10 mg protein/mL. All data were presented as mean ± standard deviation (SD, n = 3). a–d or A–D, Values with same letters indicated no significant difference of different samples on DPPH• or HO• scavenging activity (p > 0.05).
