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Abstract

ANTIBACTERIAL ACTIVITY OF PSIDIUM GUAJAVA VARIETIES AGAINST SELECTED BACTERIAL PATHOGENS

Dr. Lilly Nathan*, Singh SN and Nathan LS

ABSTRACT

The methanolic extracts of young leaves and fresh barks of Psidium guajava (var. Safeda, Surkha and L-49) were evaluated for their antibacterial activity against Staphylococcus aureus, Streptococcus mutans, Bacillus cereus, Pseudomonas aeruginosa, Klebsiella pneumoniae and Salmonella typhi. The methanolic extracts of tested plant varieties showed significant inhibition against all the tested pathogens except P. aeruginosa. The Surkha variety was found to be most potent against tested pathogens. MIC values showed that bark has higher antimicrobial activity than the leaves of the selected plants.

Keywords: Psidium guajava, methanolic extracts, antibacterial activities.


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