Figure 8: Hydroxy radical scavenging activity (HRSA) of P. hysterophorus leaf extracts. Phytochemicals present in leaf were extracted with HX, BZ, CH, EA, AC, ET, and AQ as described in methods section. % HRSA of extracts and standard antioxidant BHT was measured at different concentrations and absorbance was recorded at 412 nm. The data are expressed as mean ± SD of three replicates ( ).