THE INHIBITORY EFFECT OF TANNINS ON LIPID-PEROXIDATION OF RAT-HEART MITOCHONDRIA

induced lipid peroxidation in rat heart mitochondria with ferrous sulp hate (FeSO4) and compared the inhibitory effect of various tannins on the peroxidation. Oxygen consumption and malondialdehyde (MDA) formati on were used to quantitate the amount of lipid peroxidation, and the f ree radical scavenger activity of tannins was measured with a diphenyl -p-picryl hydrazyl (DPPH) method. Of 25 tannins and related compounds tested, catechin benzylthioether and procyanidin B-2 benzylthioether w ere the most potent in inhibiting lipid peroxidation, with inhibitory effects stronger than that of trolox, a water soluble analogue of vita min E. The concentrations (IC50) required for catechin benzylthioether and procyanidin B-2 benzylthioether to inhibit oxygen consumption to 50% of control values were 0.85 and 2.0 mu M, respectively, while thei r IC50 values from the inhibition of MDA formation were 0.9 and 1.70 m u M, respectively, The IC50 values for catechin and procyanidin B-2 to inhibit oxygen consumption were 34.0 and 11.0 mu M. Both compounds we re less potent than their benzylthioether derivatives. However, the ab ility of catechin and procyanidin B-2 to scavenge DPPH were similar to that of their benzylthioether derivatives. We conclude that conjugati on with a benzylthioether group enhances the inhibitory effect of tann ins on lipid peroxidation, and that the mechanism is not an increase i n its scavenger activity.