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Persicaria odorata is a common plant and well known locally as “daun kesum” that is commonly used in
cuisines and has various medicinal properties. This study was conducted to investigate the antimicrobial activity and the
chemical constituent of the most active plant extract. The leaves were extracted using n-hexane, dichloromethane,
methanol and water to produce the respective extracts. All extracts were tested against eight bacterial strains which
included gram positive and gram negative bacteria and one fungal strain using disc diffusion method. In this research
erythromycin 15 μg, vancomycin 30 μg and gentamicin 10 μg were used as the antibacterial standard whereas miconazole
50 μg were used as the antifungal. The antimicrobial activity of the active extract was evaluated quantitatively using broth
microdilution assay. Gas Chromatography-Mass (GC-MS) Spectroscopy analysis was used to analyze the chemical
constituent of the most active extract. N-hexane extract was found to be the most active extract against S. aureus
(29.3±0.57), S. epidermidis (32.6±1.52), S. pneumonia (11.3±1.52) and S. pyogenes (15.6±1.15). However, all the extracts
were inactive against fungi. The extract produced minimum inhibitory concentration (MIC) of 100 mg/ml against S.
aureus and 50mg/ml each against S. epidermidis, S. pneumonia and S. pyogenes. Decanal, caryophyllene, dodecanal were
the major constituents of the n-hexane extract, found by the GCMS analysis. The results obtained in this study showed
that P. odorata leaves have high potential to be used as natural antibacterial agent against some bacterial infections.