Abstract
Antioxidant activity of ethanol, acetone and water extracts of Aloe variegeta has been screened in vitro by using different methods viz. DPPH free radical scavenging activity, antioxidant activity by β-carotene bleaching method (BCBM), ferric thiocyanate (FTC) method, determination of total phenols, flavonoids, mineral (Cu, Mn, Zn, Fe) contents. Total phenols were estimated by Folin-Ciocalteu method, flavonoids by aluminum chloride colorimetric method and minerals by using Atomic Absorption Spectrophotometer (AAS). Maximum concentration (0.130 mg GAE/g) of phenols was observed from acetone extract. Colorimetric method was found effective in extracting the flavonoids to the extent of 2.91 mg CE/g from ethanol extract of A. variegeta. Maximum concentration of Mn, Zn were detected in acetone extract while Fe and copper were obtained maximum in ethanol and water extract respectively. Best result of antioxidant activity (51.7%) was shown by FTC method in acetone extract whereas highest antiradical activity (75.0%) of extracts by DPPH free radical scavenging method was shown by ethanol extract.
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