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首页> 外文期刊>Nanobiotechnology, IET >Antimicrobial activity of silver nanoparticles synthesised by using microbial biosurfactant produced by a newly isolated Bacillus vallismortis MDU6 strain
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Antimicrobial activity of silver nanoparticles synthesised by using microbial biosurfactant produced by a newly isolated Bacillus vallismortis MDU6 strain

机译：使用新分离的瓦氏芽孢杆菌MDU6菌株产生的微生物表面活性剂合成的银纳米颗粒的抗菌活性

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摘要

Microbial biosurfactants has evolved as green molecules and their chemical diversity has gained momentum in recent time not only in the field of environmental and industrial sectors but also in the pharmaceutical sector. In this study, an effort was made for the biosynthesis of silver nanoparticle (AgNPs) having antimicrobial and non-cytotoxic activities with the help of microbial biosurfactant extracted from a novel Bacillus vallismortis strain MDU6 (Genbank accession no. MH382951) from petroleum oil logged soil sample in Dibrugarh, Assam. The isolate shows excellent potential for the production of biosurfactant by reducing the surface tension of diesel supplemented medium up to 56.57% only within 5 days. FTIR spectra of the crude biosurfactant show the presence of v(CH2) (asymmetric stretching), v(CH2) (symmetric stretching), v(C=C) (stretch), v(C-C) (stretch), v(C-H) (bending), v(C-O) (stretch) and v(C-H) (bending) functional groups and LC-MS/MS analysis confirms it as a cyclic lipopeptide which is a mixture of surfactin and iturin. The synthesized AgNPs showed excellent antimicrobial activities against Escherichia coli (ATCC no. 25922), Listeria monocytogenes (ATCC No. BAA-751), Staphylococcus aureus (ATCC No. 9542) and Bacillus subtilis (ATCC no. 6051) and showed no cytotoxicity against primary mouse liver cell lines.
机译：微生物生物表面活性剂已经发展成为绿色分子，并且它们的化学多样性在近期不仅在环境和工业领域，而且在制药领域中都得到了发展。在这项研究中，人们努力从石油采伐土壤中提取的新型瓦氏芽孢杆菌菌株MDU6（Genbank登录号MH382951）中提取的微生物表面活性剂，进行具有抗菌和无细胞毒性活性的银纳米颗粒（AgNPs）的生物合成。阿萨姆邦Dibrugarh的样本。通过仅在5天内将补充柴油的培养基的表面张力降低至56.57％，该分离物就具有生产生物表面活性剂的巨大潜力。粗生物表面活性剂的FTIR光谱显示存在v（CH2）（不对称拉伸），v（CH2）（对称拉伸），v（C = C）（拉伸），v（CC）（拉伸），v（CH） （弯曲），v（CO）（伸展）和v（CH）（弯曲）官能团以及LC-MS / MS分析证实它为环状脂肽，是表面活性素和iturin的混合物。合成的AgNPs对大肠杆菌（ATCC编号25922），单核细胞增生李斯特菌（ATCC编号BAA-751），金黄色葡萄球菌（ATCC编号9542）和枯草芽孢杆菌（ATCC编号6051）表现出优异的抗微生物活性，并且没有细胞毒性小鼠原代肝细胞系。

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