Accepted 15 March 2012Available online 20 May 2012

来源 :亚太热带医药杂志(英文版) | 被引量 : 0次 | 上传用户:www_073
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ABSTRACT Objective:To evaluate the insecticidal, antimicrobial and antioxidant activities of bulb extracts ofAllium sativum(A. sativum).Methods:Dried bulbs ofA. sativum were extracted with different solvents and evaluated for insecticidal, antimicrobial and antioxidant activities.Results:Aqueous and methanol extracts showed highest insecticidal activity (mortality rate of81% and 64% respectively) against the larvae ofSpodoptera litura (S. litura) at a concentration of1 000 ppm. With regard to antimicrobial activity, aqueous extract exhibited antibacterial activity against gram positive (Bacillus subtilis, Staphylococcus aureu,) and gram negative (Escherichia coliandKlebsiella pneumonia) strains and antifungal activity againstCandida albicans. While methanol extract showed antimicrobial activity against all the tested micro organisms except two (Staphylococcus aureus andCandida albicans), the extracts of hexane, chloroform and ethyl acetate did not show any anti microbial activity. Minimum inhibitory concentration of aqueous and methanol extracts against tested bacterial and fungal strains was100-150 μg/mL. Antioxidant activity of the bulb extracts was evaluated in terms of inhibition of free radicals by 2, 2’-diphenly-1-picrylhydrazyl. Aqueous and methanol extracts exhibited strong antioxidant activity(80%-90% of the standard).Conclusions: Antioxidant and antimicrobial activity of A. sativum against the tested organisms therefore, provides scientific basis for its utilization in traditional and folk medicine. Also, our results demonstrated the insecticidal efficacy ofA. sativum againstS. litura, a polyphagous insect.
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