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Reductive capacity of plant extracts or fractions of C. lutea. Plant reducing power was assessed via the ability to reduce ferric (Fe3+) to ferrous (Fe2+) iron. The percentage increase of reductive capacity with increasing plant extract concentration was determined. Ascorbic acid (vitamin C) was used as a positive control. (A) Stem, (B) leaf, and (C) root. Results are expressed as means ± SEM for three separate experiments at each concentration.
