<![CDATA[Betel leaf extract supplements, Piper betle Lin , was made by extracting maceration of betel leaves with ethanol 96%. Phytochemical screening of betle leaf extract obtained secondary metabolites such as : terpenoids, steroids, phenolics, and saponins . The results of the antioxidant activity test test showed that n-hexane fraction was more reactive as an antioxidant (IC50 26,73 mg/L) than the diethyl ether fraction (IC50 114,54 mg/L). The MDA analysis showed that the betel leaves have a very good ability to reduce MDA levels. The concentration of MDA with addition of allopurinol (as positive control) was 0,41±0,0021?L/mL, while with addition of betel leaves the level was 0,44±0,0021?L/mL. The structure identification obtained active antioxidant compounds such as: cavicol, eugenol, caryophilene and isoeugenol. Keywords : betel leaf, malondialdehyde, Piper betle, wistar rat]]>
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