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cowpea storage bruchid was purified by affinity gel chromatography of glutathione sepharose. Inhibition effect of the plant extracts on the GST was studied by spectrophotometric method. The binding of the extract was competitive by the Dixon plot with Ki of 84, 132 and 180 ug/mL for T.
diversifolia , C. rotundus and H. suavolens, respectively. We suggest that reported efficacy of the extract is due to the antioxidant properties and competitve binding inhibition on GST may contribute to the pharmacological basis of the efficacy against cowpea storage bruchid, C. maculatus Frabiricius and its attendant managements.