Figure 6: Metal ion chelating ability of P. hysterophorus leaf extracts. Phytochemicals present in sample were extracted with hexane (HX), benzene (BZ), chloroform (CH), ethyl acetate (EA), acetone (AC), ethyl alcohol (ET), and water (AQ) as described in methods section. Metal ion chelating activity of extracts and standard antioxidant propyl gallate (PG) was measured at different concentrations and absorbance was recorded at 562 nm. The results are expressed as mean ± SD of three replicates ( ).