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Screening of Antibacterial Activity of Six Plant Essential Oils Against Pathogenic Bacterial Strains

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Author(s): Ravi Kant Upadhyay

Journal: Asian Journal of Medical Sciences
ISSN 2040-8765

Volume: 2;
Issue: 3;
Start page: 152;
Date: 2010;
Original page

Keywords: MIC | MBC | antibacterial activity | essential oils

ABSTRACT
In the present investigation antimicrobial activity of six different plant essential oils i.e., citrus(Citrus lemon), olive (Olea europaea), ajwain (Trachiyspirum ammi), almond (Amygdalus communis), Bavchi(Psoralea corylifolia) and neem (Azadirachta indica) oils have been evaluated. After bioassays, most of theessential oils were found susceptible to both Gram-positive bacteria such as Lactobacillus acidophilus,Streptococcus pneumoniae, Staphylococcus aureus, Micrococcus luteus, Bacillus cereus and Gram-negativebacteria Klebsiella pneumoniae, Escherichia coli. For screening of antimicrobial susceptibility in each essentialoil, both positive and negative controls were set to determine MIC (minimum inhibitory concentration), MBCvalues (minimum bactericidal concentration) and growth inhibition zone diameters. Among all essential oilsalmond and neem oils were found to be highly bactericidal, as it has shown lowest MIC and MBC values andhigh growth inhibition zone diameter in comparison to antibiotics. Present study reveals significantly higherbroad-spectrum antibacterial activity in essential oils than antibiotics i.e., tetracycline, ampicillin andciprofloxacin.
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