Contribution of specific amino acid and secondary structure to the antioxidant property of corn gluten proteins

Abstract The composition, structure, and proper positioning of amino acid in a peptide are closely related to its antioxidant activity. In this study, we purified antioxidant peptides from corn protein hydrolysates (CPH) and identified novel antioxidant peptides from fraction CPH2-III as Ala-Gly-Ile/Leu-Pro-Met (AGI/LPM; 487.62 Da) and His-Ala-Ile/Leu-Gly-Ala (HAI/LGA; 467.53 Da). AGLPM and HALGA exhibited better oxygen radical absorbance capacities than AGIPM and HAIGA did ( P