Antimicrobial activity of tropical fruits

ABSTRACT: The present study was designated to study the antimicrobial activities of aqueous and alcohol extracts that were prepared from fresh fruits of Malus domestica, Punica granatum, Psidium guajava, and Citrus sinenses. The antimicrobial activities of the extracts were tested against bacteria and fungi by the use of agar well diffusion method. The aqueous extracts showed higher antimicrobial activity as compared to alcohol extracts. The aqueous extracts of M.domestica were most active against Candida albicans with the (MIC = 1.2 cm) and inactive against gram negative bacteria Escherichia coli. Gram positive bacteria Staphylococcus aureus extracts were found to be most active for P.guajava and P.granatum with (MIC = 1.1cm and 1.0cm respectively), while the alcohol extract of M.domestica showed highest antimicrobial activity for gram positive bacteria Bacillus subtilis with (MIC = 0.8cm) and no activity against gram negative bacteria Pseudomonas aeuroginosa. Similarly, P.guajava and C.sinensis showed no activity against gram positive bacteria S.aureus.