Recently, natural plants have received much attention as sources of biological active substances. In the present study\r\nwe investigated different extracts of Hedychium coronarium rhizomes for their in-vitro antimicrobial activity. In-vitro\r\nantimicrobial activity was evaluated for methanolic, chloroform and hexane extracts against five bacterial and two fungal strains\r\nby using cylinder plate assay. All the tested extracts of Hedychium coronarium showed significant zone of inhibition against\r\ntested bacterial and fungal strains in a dose dependent manner. All the extracts showed good zone of inhibition at a doses of 250\r\nand 500 ?g/ml. The highest zone of inhibition was shown by chloroform extract against Klebsiella pneumonia at the dose of 500\r\n?g/ml. All extracts exhibited antimicrobial activity in a dose dependent manner but relatively low activity when compared to\r\nthat of standard rifampicin. The activity may be higher if larger dose levels were employed.
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