Antioxidant Activity of Diterpenes and Polyphenols from Ophryosporus heptanthus

摘要

The antioxidant activity of 14 compounds(1-14)isolated from the ether and butanolic extracts of the aerial parts of Ophryosporus heptanthus has been assayed using a beta-carotene bleaching method and the DPPH technique.Compounds 1 and 13 showed the most potent antioxidant activity.Their structures have been established by spectroscopic techniques(mainly NMR).Compounds 7 and 12 are new natural products,and their structures have been confirmed by chemical synthesis.