Antibacterial activity of black pepper (<i>Piper nigrum</i> Linn.) with special reference to its mode of action on bacteria

Abstract

During present study the antibacterial activity of black pepper (<i style="">Piper nigrum </i>Linn.) and its mode of action on bacteria were done. The extracts of black pepper were evaluated for antibacterial activity by disc diffusion method. The minimum inhibitory concentration (MIC) was determined by tube dilution method and mode of action was studied on membrane leakage of UV₂₆₀ and UV₂₈₀ absorbing material spectrophotometrically.

The diameter of the zone of inhibition against various Gram positive and Gram negative bacteria was measured. The MIC was found to be 50-500ppm. Black pepper altered the membrane permeability resulting the leakage of the UV₂₆₀ and UV₂₈₀ absorbing material i.e., nucleic acids and proteins into the extra cellular medium. The results indicate excellent inhibition on the growth of Gram positive bacteria like <i style="">Staphylococcus aureus</i>, followed by <i style="">Bacillus cereus</i> and <i style="">Streptococcus faecalis</i>. Among the Gram negative bacteria <i style="">Pseudomonas aeruginosa</i> was more susceptible followed by <i style="">Salmonella typhi</i> and <i style="">Escherichia coli.</i>