Antioxidant activities of the selected plants from the family Euphorbiaceae, Lauraceae, Malvaceae and Balsaminaceae

摘要

Extraction of nine plants selected from the family Euphorbiaceae, Lauraceae, Malvaceae and Balsaminaceae was done in petroleum ether, chloroform, ethyl acetate and methanol-butanol in order of increasing polarity using soxhlet apparatus. Total phenolic contents were determined with Folin-Ciocalteu reagent which ranged from 30.5 to 547.0 mg GAE/g of extract. Maximum phenolic contents were found in n-butanol extract of?Ricinus?communis. Antioxidant activities of these extracts were evaluated through DPPH??radical scavenging, phosphomolybdate and ferric thiocyanate (FTC) methods. Methanolic extract of?Cinnamomum?zeylanicumand?Cinnamomum?tamala?showed highest antiradical (96.8%) and phosphomolybdate (1.131) activity, respectively, while ethyl acetate extract of?R. communis?exhibited maximum lipid per-oxidation (FTC) activity (79.3%). IC50?value of chloroform extract of?C. tamala?(2.2 μg/ml) was less than gallic acid (4.4 μg/ml), while ethyl acetate and methanol extracts of?Abutilon?bidentatum,?Impatiens?bicolorand?Impatiens?edgeworthii?exhibited the IC50?values in the range of 10.0 - 20.0 μg/ml.