In vitro antioxidant activity of stem bark of Trichilia catigua Adr. Juss

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Antioxidant activity of the ethanolic extract and fractions from the stem bark of T. catigua was investigated. IC50 (for DPPH scavenging) by T. catigua varied from 9.17 ± 0.63 to 76.42 ± 5.87 mg mL-1 and total phenolic content varied from 345.63 ± 41.08 to 601.27 ± 42.59 mg GAE g-1 of dry extract. Fe2+-induced lipid peroxidation was significantly reduced by the ethanolic extract and fractions. Mitochondrial Ca2+-induced dichlorofluorescein oxidation was significantly reduced by the ethanolic extract in a concentration-dependent manner. Ethanolic extract reduced mitochondrial Dym only at high concentrations (40-100 mg mL-1), which indicates that its toxicity does not overlap with its antioxidant effects. Results suggest involvement of antioxidant activities of T. catigua in its pharmacological properties.

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