Invasive Species Compendium

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Abstract Full Text

Evaluation of antimicrobial potential of Costus pictus leaf extracts.


Costus pictus is a family of Costaceae, a recently introduced plant from Mexico has shown its potential as herbal drug for diabetes. Costus pictus is rhizomatous medicinal herb. Leaf of this herbal plant helps to build up insulin by strengthening b- cells of pancreas in the human body thus popularly known as "insulin plant" in India. Many important and beneficial aspects of C. pictus are reported, which includes anti-diabetic, anti-microbial, anti-cancer, anti-oxidant, anti-fertility, anti-helminthic, diuretic, anti-inflammatory properties. The antimicrobial activity was evaluated using disc diffusion method and effect of concentration of ethanolic extract on growth of bacteria culture was carried out by tube dilution technique. Different concentration of ethanolic, chloroform and aqueous leaf extracts were tested. The ethanolic extract was found to have significant activity against both gram-positive-Enterococcus faecalis, Staphylococcus aureus, Bacillus subtilis, Lacto bacillus and Streptococcus mutans and gram-negative bacteria- Escherichia coli, Pseudomonas aeruginosa, Proteus vulgaris, Klebsiella pneumonia and proteus mirabilis. The selected medicinal plant is the reservoir of potential anti-microbial compounds that are useful as an alternative to synthetic microbicides and are used to develop combination drugs for many pharmaceutical necessaries. The powerful anti-bacterial effect was attributed due the presence of active compounds present in the ethanolic leaf extract of Costus pictus. The present study was conducted to investigate the anti-bacterial activityof Costus pictus leaf extract in three different solvents Chloroform, ethanol and aqueous.