
	Research Journal of Microbiology
	Year: 2007 \| Volume: 2 \| Issue: 11 \| Page No.: 845-850 DOI: 10.3923/jm.2007.845.850

In vitro Anti-Microbial Activity of Psidium guajava Extracts

Rasha S. Ahmed and Sanaa O. Yagoub

Abstract: Petroleum ether, methanol and water extracts of Psidium guajava leaves were tested to determine their possible antimicrobial activity against Gram-positive (Staphylococcus aureus and Bacillus subtilis) and Gram-negative bacteria (E. coli and Salmonella typhi) and fungi (Aspergillus niger and Candida albicans). Each extract was used in concentration of 100, 50, 25 and 10%. Gram-positive and Gram-negative bacteria showed susceptibility toward all extracts, the zones of their inhibition ranged between (13-28 mm). Aspergillus niger showed complete resistance toward all extracts at all concentrations while Candida albicans was inhibited by water extract, all concentrations of petroleum ether extract and only concentration at 10% of methanol extract, the zones of inhibition ranged between (13-20 mm).

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How to cite this article:

Rasha S. Ahmed and Sanaa O. Yagoub, 2007. In vitro Anti-Microbial Activity of Psidium guajava Extracts. Research Journal of Microbiology, 2: 845-850.

DOI: 10.3923/jm.2007.845.850

URL: https://scialert.net/abstract/?doi=jm.2007.845.850

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