© Georg Thieme Verlag Stuttgart · New York
Antioxidative Action of Diterpenoids from Podocarpus nagi
04 January 2007 (online)
Diterpenoids, totarol (1), totaradiol (2), 19-hydroxy-totarol (3), totaral (4), 4β-carboxy-19-nortotarol (5), sugiol (6), isolated from Podocarpus nagi, were evaluated as antioxidants. Microsomal lipid peroxidation induced by Fe(III)-ADP/NADPH and mitochondrial lipid peroxidation induced by Fe(III)-ADP/ NADH were inhibited by these terpenoids. They inhibited linoleic acid autoxidation but not generation of superoxide anion. Totarol (1) protected mitochondrial respiratory enzyme activities against NADPH induced oxidative injury. Totarane diterpenes from P. nagi were shown to be effective to protect biological systems and function against various oxidative stresses.
Podocarpus nagi - Podocarpaceae - totarol - totarane diterpenes - lipid peroxidation - mitochondrial oxidative injury