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Research Journal of Microbiology
  Year: 2007 | Volume: 2 | Issue: 11 | Page No.: 845-850
DOI: 10.3923/jm.2007.845.850
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In vitro Anti-Microbial Activity of Psidium guajava Extracts

Rasha S. Ahmed and Sanaa O. Yagoub

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






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