Study on antioxidant and hypoglycemic activity stability from Myrica rubra peptide

The stability of antioxidant and hypoglycemic activity from Myrica rubra peptide were determined with the effects of temperature,p H,saccharides,antiseptics and metal ions on the DPPH radicals scavenging activity and α-glucosidase inhibition activity assessed,but also investigated its relative molecular mass distribution. The result showed that the relative molecular mass distribution of Myrica rubra peptide range from118.9 ~4552.2u with an excellent heat-resistant and heat-resistant ability. But antioxidant activity lost and hypoglycemic activity rose slightly in the alkali environment. Saccharides could increase the antioxidant activity significantly in the order of glucose >lactose >sucrose. Both benzoic acid and Na Cl had no effects on antioxidant activity. Benzoic acid had no significant effects on hypoglycemic activity( p > 0. 05), but Na Cl improved the hypoglycemic activity from 1.5% to 2%. Both Cu2 +and Zn2 +reduced the antioxidant and hypoglycemic activity. Mg2+and K+had no significant effects on antioxidant activity(p>0.05),but hypoglycemic activity was slightly enhanced by Mg2+and K+had no significant effects on hypoglycemic activity(p>0.05).