Asian Journal of Microbiology, Biotechnology & Environmental Sciences Paper

Vol.13, Issue 2, 2011; Page No.(267-270)

ANTI BACTERIAL EFFECT OF SELECTED MEDICINAL PLANT EXTRACTS ON STRAINS OF ENTEROBACTERIACEAE ISOLATED FROM SEWAGE WATER, VISAKHAPATNAM, INDIA

P.V.D. SOUJANYA KUMARI AND A. BALAKRISHNA

Abstract

The anti microbial activity of leaf and bark extracts prepared from 5 medicinally important plants like Terminalia alata, Dillenia pentagyna, Xylia xylocorpa, Pterocorpus marsupium and Lannea coromondelica were tested against 22 isolates belonging to the family Enterobacteriaceae by using agar diffusion method. The strains were isolated from sewage sample, collected from sewage treatment plant, Visakhapatnam, by using modified selective VRBG (Violet Red Bile Glucose) agar medium, which allows the recovery of all members of Enterobacteriaceae. The crude extracts prepared from methanol showed zone of inhibition ranging from 0.1mm 15mm. The leaf extract of Terminalia alata was capable of inhibiting maximum number (68%) of strains. The bark extract of Lannea coromandelica and leaf extract of Dillenia pentagyna were capable of inhibiting 22% &13% of the strains. The other two extracts were not showing any antibacterial activity. The result indicates that the leaf extract of Terminalia alata possessed potential antimicrobial activity against Enteric strains.

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