Abstract
The main aim of this study was to evaluate the phytochemical composition of extracts of Mentha piperita var. citrata obtained by using three different solvents as well as their antimicrobial activity against a panel of Gram positive and Gram negative bacteria. The antibacterial activities of the extracts (hexane, chloroform, and 70% aqueous methanol) were tested against a panel of bacteria using broth microdilution method. Rosmarinic acid (10.505 mg/g extract), cynaroside (8.545 mg/g extract) and cosmosiin (8.489 mg/g extract) appeared to be the major components of methanolic extract, whereas acacetin was the most abundant (8.438 mg/g extract) component of chloroform extract. M. citrata extracts showed significant antimicrobial activity against Gram positive bacteria at different concentrations. Chloroform extract from M. citrata showed antimicrobial activity at concentration of 512-4096 µg/mL, whereas hexane and methanolic extracts had activity at 1024-4096 µg/mL and 2048-4096 µg/mL, respectively. This study shows the different chemical composition and antimicrobial activities of M. citrata extracts obtained by using different extraction solvents.
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