In Vitro Antimicrobial Study of Plant Essential Oils and Extracts

E. Subudhi, Suneha Mohanty, S. Mohanty, A. Kuanar, M. Panda
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引用次数: 2

Abstract

Present investigation provides comprehensive and quantifiable information on in vitro assay of 31 medicinal plant oils and extracts exposed to ten pathogenic and food spoiling microorganisms by agar diffusion method through determination of inhibition zone diameter. Among the bacterial species exposed to O. sanctum oil, highest susceptibility was displayed by Enterococcus faecalis whereas to lemongrass oil the highest was shown by Pseudomonas aeruginosa as denoted by SI, the susceptibility index. Little variation in activity has been observed from the anti bacterial index (AbI) among lemongrass cultivars. Highest growth inhibiting potential was shown by lemongrass cultivar CF4 against pathogen Bacillus subtilis and food poisoning organism Staphylococcus aureus and by cultivar CF5 against human pathogens Escherichia coli, Enterococcus faecalis. Only specific plant chemical extracts like acetone extract of P.niruri, methanol extract of stevia demonstrated activity against plant pathogens A. solani and P. aeruginosa respectively but acetone extract of M. coenigii has significant anti microbial activity against animal pathogen P. mirabilis, E. feacalis. Amongst the essential oil exposed to four fungal pathogens A. niger, P. chrysogenum, A. solani and H. solani, excellent anti fungal activity was observed by all lemongrass cultivars followed by C. longa and O. sanctum which is clearly evident from anti fungal index (AfI) but among the chemical extracts tested only petroleum ether extract of stevia and ethanol extract of P.niruri were found to have optimum activity respectively against A. solani and H.solani . Water and chloroform extract of P.niruri, ethanol and cyclohexane extract of Stevia, water extract of M. coenigii shows no or meager activity.
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植物精油及提取物的体外抗菌研究
本研究通过测定抑菌带直径,为琼脂扩散法测定31种药用植物精油和提取物对10种致病性和食品腐败微生物的体外检测提供了全面、可量化的信息。以敏感指数SI表示,粪肠球菌对香茅油的敏感性最高,铜绿假单胞菌对香茅油的敏感性最高。不同柠檬草品种间抑菌指数(AbI)差异不大。柠檬草品种CF4对枯草芽孢杆菌和食物中毒生物金黄色葡萄球菌的生长抑制潜力最大,而品种CF5对人类致病菌大肠杆菌、粪肠球菌的生长抑制潜力最大。只有特定的植物化学提取物如甘叶菊的丙酮提取物和甜菊糖的甲醇提取物分别对植物病原菌A. solani和P. aeruginosa有活性,而M. coenigii的丙酮提取物对动物病原菌P. mirabilis和E. feacalis有显著的抑菌活性。香茅精油对4种真菌病原菌黑曲霉、黄曲霉、茄蚜和茄蚜均有较好的抗真菌活性,其次是长叶香茅和圣叶香茅,抗真菌指数(AfI)比较明显,而化学提取物对茄蚜和茄蚜的抗真菌活性最优的分别是甜菊叶石油醚提取物和尼鲁里香茅乙醇提取物。甘叶菊的水和氯仿提取物、甜菊糖的乙醇和环己烷提取物、柯尼氏松的水提取物没有或只有微弱的活性。
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