Lipid peroxidation assay
Lipid peroxidation (LPO) inhibitory activity was measured according to Kulkarni, Aradhya, and Divakar (2004). Egg lecithin (3 mg/ml in phosphate buffer, pH 7.4) was sonicated (Hielscher GmbH UP 50H ultra-challprozessor sonicator) for 30 min to obtain small membrane liposome vesicles. Different concentrations of the samples were added to 0.5 ml of liposome mixture. Lipid peroxidation was induced by adding 10 μl of 400 mM FeCl3 and 10 μl of 200 mM l-ascorbic acid. After 60 min of reaction at 37 °C, the reaction was stopped by the addition of 1 ml of 0.25 N HCl containing 15% TCA and 0.375% TBA and incubation in a boiling water bath for 15 min. After centrifugation at 10,000 rpm, absorbance of the supernatant was measured at 532 nm. The scavenging effect was calculated using the equation as described for DPPHradical dot.