I. T. Phucho1, Th. Sharatchandra Singh2*, Lensayula1, and Putusenla Imchen1

1Department of Chemistry, Nagaland University, Lumami-798620 (India) 2Department of Chemistry, Thambal Marik College, Oinam-795134 (India) *Corresponding author thokchomsharat108@gmail.com

ABSTRACT

The present study deal with the biological activity and flavonoid content of the dried rhizomes of Alpinia nigra, Alpinia galanga, Amomum gracile, Curcuma leucorhiza, Costus speciosus, Curcuma amada, Hedychium rubrum, Hedychium maximum, Kaempferia rotunda and Hedychium coronarium belonging to the family of Zingiberaceae. Methanol was used to extract the active bio-compounds from the plants that were pre dried and the crude extract was further used for the antimicrobial study and also for determining the flavonoid content. The values are presented as mg quercetine equivalent per gram of the sample’s extract and the values are arrange as: Curcuma leucorrhiza (312.61), Alpinia nigra (199.57), Curcuma amada (197.43), Hedychium maximum (183.33), Hedychium coronarium (138.46), Hedychium rubrum (129.06), Amomum gracile (97.43), Alpinia galanga (92.31), Costus speciosus (68.80) and Kaempferia rotunda (22.65) respectively. For antibacterial activity, we have used three bacteria namely, Micrococcus luteus, Bacilluus subtilis and Escherichia coli; Chloramphenicol is used as the standard microbics and the results are presented in mm (zone of inhibition).

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