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Monday, June 16, 2008

Antimicrobial activity of Black Cumin seeds (Nigella sativa) against multidrug resistant strains of Coagulase negative Staphylococci.

Salman, Mohd TariqKhan, Rahat Ali and Shukla, Indu (2008Antimicrobial activity of Black Cumin seeds (Nigella sativa) against multidrug resistant strains of Coagulase negative Staphylococci. Hippocratic Journal of Unani Medicine3 (1). pp. 107-115

.Nigella sativa (black cumin) seed oil and methanolic extract were tested in varying dilutions against strains of Staphylococcus epidermidis and other coagulase-negative staphylococci resistant to a number of clinically used antibiotics isolated from patients attending JN Medical College Hospital, Aligarh, using disc agar diffusion technique on inoculated Muellar Hinton agar plates under standard laboratory conditions. Both the oil and extract showed remarkable dose dependent antibacterial activity against the tested strains upto a dilution of 1:50 as evident from the zones of inhibition. No cross resistance was noticed with any of the tested antibiotics. To the best of our knowledge, the activity of N. sativa against multidrug resistant clinical strains of Coagulase negative staphylococci is being reported for the first time.
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Antimicrobial activity of Nigella sativa Linn. seed oil against multi-drug resistant bacteria from clinical isolates

Salman, Mohd Tariq; Khan, Rahat Ali and Shukla, Indu (2008) Antimicrobial activity of Nigella sativa Linn. seed oil against multi-drug resistant bacteria from clinical isolates. Natural Product Radiance, 7 (1). pp. 10-14. ISSN 0972-592X, IPC code; Int. cl.8— A61K 36/00, A61P 31/04.
Abstract
An alarming increase in bacterial strains resistant to existing antimicrobial agents demands a renewed effort to seek agents effective against pathogenic bacteria resistant to current antimicrobials. Nigella sativa Linn. essential oil was studied for antibacterial activity against various clinical isolates of bacteria resistant to a number of antibiotics, in varying concentrations by Disc Agar diffusion technique using impregnated filter paper discs on inoculated Muellar Hinton agar plates. The oil showed pronounced dose dependent antibacterial activity which was more against Gram positive than Gram negative bacteria. Among Gram positive bacteria tested, Staphylococcus aureus, S. epidermidis, other coagulase –ve Staphylococci and Streptococcus pyogenes were sensitive to the oil and Enterococcus faecalis, Streptococcus agalactiae were resistant. Among Gram –ve bacteria tested, only Pseudomonas aeruginosa was sensitive to oil and rest (Acinetobacter baumannii, Citrobacter freundii, Klebsiella pneumoniae, Proteus mirabilis, P. vulgaris and Vibrio cholerae) were insensitive. Out of 144 strains tested, most of which were resistant to a number of antibiotics, 97 were inhibited by the oil of black cumin. To the best of our knowledge, the activity of essential oil against coagulase negative Staphylococci (except S. epidermidis) and S. pyogenes is being reported for the first time.

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