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Research Journal of Microbiology
Year: 2007  |  Volume: 2  |  Issue: 11  |  Page No.: 824 - 830

Antibacterial Activity of Tamarindus indica Fruit and Piper nigrum Seed

Warda S. Abdel Gadir, Fathia Mohamed and Amel O. Bakhiet    

Abstract: A study is described in which petroleum ether, ethanol and water extracts from Tamarindus indica ripe fruit and Piper nigrum seed in different concentrations (10-100%) were evaluated for their possible antibacterial activity against four standard pathogenic microorganisms, Staphylococcus aureus (gram-positive bacterium), Escherichia coli, Pseudomonas aeruginosa and Salmonella typhi (gram-negative bacteria). The ethanol extract from T. indica fruit in different concentrations exhibited higher activity against all test bacteria than that from P. nigrum seed and that the activity is concentration-dependent. Petroleum ether extract from P. nigrum seed in different concentrations had no activity against E. coli, Ps. aeruginosa or S. typhi but had activity against S. aureus (inhibition zones 12-15 mm). Petroleum ether from T. indica fruit in concentrations of 10-100% had no antibacterial activity against E. coli and Ps. aeruginosa but the growth of S. aureus and S. typhi was only inhibited by 50% concentration of petroleum ether extract (inhibition zones, 5 mm). Water extract from T. indica fruit at 100% concentration produced inhibition zones at 14-15 mm for E. coli and Ps. aeruginosa, respectively, but had no activity against S. aureus or S. typhi. Water extract in 100% concentration from P. nigrum seed caused inhibition zones at 15 and 12 mm against S. aureus and S. typhi but had no activity against E. coli or Ps. aeruginosa. These findings were compared with those produced by gentamicin (10 μg), a reference antibiotic.

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