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Fe2+ chelation assay. Effects of (a) Spondias pinnata plant extract and (b) standard EDTA on ferrozine-Fe2+ complex formation. The data are expressed as percentage inhibition of chromogen formation. The results are mean ± S.D. of six parallel measurements. ***p < 0.001 vs 0 μg/ml. IC50 = 66.54 ± 0.84 μg/ml. The IC50 value of the standard is 1.27 ± 0.05 μg/ml.
