Antibacterial Activity Test of Extracts and Fractions of Cassava Leaves ( Crantz) against Clinical Isolates of and Causing Acne.

This study is aimed at determining antibacterial activity from ethanol extracts and the most active fraction of cassava leaves against clinical isolates of and . Research carried out by the experimental method involved determination of plants, extraction with maceration method, fractionation with liquid-liquid extraction, antibacterial activity testing of extracts and fractions by agar diffusion method, determination of most active fraction from the extract, and minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) testing of most active fraction by microdilution method. The results showed that ethanol extracts of cassava leaves had antibacterial activity against both bacteria with the most active fraction indicated by ethyl acetate. MIC values of ethyl acetate fraction against were in the concentration range of 2.5%-5.0% (w/v) and against were in the concentration range of 1.25%-2.5% (w/v). The MBC value of ethyl acetate fraction against was at a concentration of 5% (w/v), while was at a concentration of 2.5% (w/v). From the results of this study, it can be concluded that the ethanol extract of cassava leaves ( Crantz) has antibacterial activity against clinical isolates of as well as on . The fraction with the best activity from the ethanol extract of cassava leaves to the two test bacteria was shown by ethyl acetate fraction. It is suggested that cassava leaves are possible to be developed into standardized antiacne herbal.