Properties and characterization of antioxidant and antiglycative activities for the multiple harvests of aquatic- and field-cultivated peanut leaves and stems

Peanut top parts of leaves and stems are feasible to be consumed as a vegetable. Peanut kernels of Tainan 9 were aquatic- and field-cultivated for 30 days and the top parts were harvested for three times at a 10-day interval. The highest total phenolics, epicatechin and caffeic acid contents in leaves were detected in the second harvest of aquatic-cultivation. In comparison, higher epicatechin and caffeic acid contents were observed in leaves of aquatic-cultivation than the field-cultivated leaves. The reducing powers, total equivalent antioxidant capacity and inhibitory activities against AGEs formation varied with a close dependence on total phenolics contents. Based on SDS-PAGE analysis, all harvested aquatic- and field-cultivated peanut leaves were effective in inhibition of albumin glycation. It is of merit to demonstrate that multiple harvests of the green top parts of peanuts bear potent antioxidant and antiglycative activities. (C) 2012 Elsevier Ltd. All rights reserved.