Antioxidant and -Glucosidase Inhibitory Activities Guided Isolation and Identification of Components from Mango Seed Kernel.

In the present study, petroleum ether, dichloromethane, ethyl acetate, and -butanol fractions of mango seed kernel exhibited different degrees of antioxidant and -glucosidase inhibitory activity. Thus, quantitative and qualitative analysis of the petroleum ether fraction was conducted by GC-MS. Among identified components, four unsaturated fatty acids had never been reported in natural products before, together with 19 known components. In addition, 17 compounds were isolated and elucidated from other active fractions. Compounds , , , and were isolated for the first time from genus. Compounds and exhibited prominent DPPH radical scavenging and -glucosidase inhibitory effects. In order to further explore their mechanism of -glucosidase inhibition, their enzyme kinetics and in silico modeling experiments were performed. The results indicated that inhibited -glucosidase in a noncompetitive manner, whereas acted in a competitive manner. In molecular docking, the stability of binding was enhanced by - T-shaped, -alkyl, - stacked, hydrogen bond, and electrostatic interactions. Thus, compounds and were determined to be new potent antioxidant and -glucosidase inhibitors for preventing food oxidation and enhancing hypoglycemic activity.