| The anthocyanin extract from purple sweet potato (PSP) was prepared by means of microwave baking (MB) and acidified electrolyzed water (AEW). The extraction efficiency in AEW (pH 3.0) was up to 35%. When pH≤3.00, the lower the pH values of the extracts in solution were, the darker the red extracts were. Total flavonoids, phenolic and monomeric anthocyanin, total sugar and total amino acid contents in extract was evaluated. Vitro assay indicated that the anthocyanin extracts was equally strong in their scavenging capability of DPPH? free radicals, the reducing power and inhibiting lipid peroxidation. Antioxidant activity tests showed that the extract could significantly delay the aging in mice. We used PSP extracts to feed aged mice a month; its anti-aging index in vivo was much higher than control group, 5-month-old mice. The blood sugar experiment results showed that PSP anthocyanin could significantly reduce blood glucose in mice. The results demonstrated PSP anthocyanin inhibited sarcoma in mice.
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