Fig. 7

Nitric oxide radical scavenging activity of Moringa oleifera leaf from the 21 locations. The results are mean of triplicates of three different concentrations (50 μg/mL, 150 μg/mL and 250 μg/mL) with the error bars (standard deviation). The chart shows significant between- and within-group differences in the nitric oxide content of the samples from the locations. The nitric oxide radical scavenging activity of some locations compares well with the standard (quercitin)