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首页> 外文期刊>Bioprocess and Biosystems Engineering >Valorization of mutant Bacillus licheniformis M09 supernatant for green synthesis of silver nanoparticles: photocatalytic dye degradation, antibacterial activity, and cytotoxicity
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Valorization of mutant Bacillus licheniformis M09 supernatant for green synthesis of silver nanoparticles: photocatalytic dye degradation, antibacterial activity, and cytotoxicity

机译：突变的地衣芽孢杆菌M09上清液用于银纳米颗粒绿色合成的价值评估：光催化染料降解，抗菌活性和细胞毒性

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The present study reports the optimization of a green method for the synthesis ofsilver nanoparticles (AgNPs) via reduction of Ag+ ions using cell-free supernatant of mutant Bacillus licheniformis M09. UV-Visible spectroscopy showing an absorption peak at similar to 430nm confirmed the synthesis of AgNPs. Transmission electron microscope (TEM) analysis exhibited spherical AgNPs within the size range of 10-30nm. Fourier transform infrared (FTIR) measurements assured the presence of effective functional molecules which could be responsible for stabilizing the AgNPs. X-ray diffraction (XRD) pattern verified the crystalline nature of AgNPs. Furthermore, the synthesized AgNPs showed anexcellent photocatalytic degradation of methylene blue dye in less than 3h under visible light proving their potential as a catalytic agent for bioremediation for next-generation dye degradation in effluent treatment. The AgNPs demonstrated antimicrobial activity against Gram-positive and Gram-negative foodborne pathogens which endorsed its suitability as agents to extend shelf-life in food packaging and food safety applications. The results also revealed a strong concentration-dependent cytotoxicity of AgNPs against human breast adenocarcinoma cells (MCF-7), while 15.07 mu g/mL of IC50 was attained. The outcome suggests the possible application of these AgNPs in nanomedicine formulations. Thus, these findings propose promising ways for the valorization of the waste fermentation supernatant left after cell harvesting and desired metabolite extraction.[GRAPHICS].
机译：本研究报告了绿色绿色方法的优化，该方法使用突变型地衣芽孢杆菌M09的无细胞上清液通过还原Ag +离子来合成银纳米颗粒（AgNPs）。紫外可见光谱显示吸收峰接近430nm，证实了AgNPs的合成。透射电子显微镜（TEM）分析显示球形AgNPs在10-30nm的尺寸范围内。傅立叶红外光谱（FTIR）测量确保了有效的功能分子的存在，该分子可以稳定AgNPs。 X射线衍射（XRD）模式验证了AgNPs的晶体性质。此外，合成的AgNPs在可见光下不到3h即可表现出优异的光催化降解亚甲基蓝染料的性能，证明了其作为废水修复中下一代染料降解的生物修复催化剂的潜力。 AgNPs对革兰氏阳性和革兰氏阴性食源性病原体表现出抗菌活性，这证明了其适合作为延长食品包装和食品安全应用中保质期的试剂的适用性。结果还表明，AgNPs对人乳腺癌细胞（MCF-7）具有很强的浓度依赖性细胞毒性，而IC50达到15.07μg / mL。结果表明这些AgNP在纳米药物制剂中的可能应用。因此，这些发现为细胞收获和所需代谢物提取后留下的废弃发酵上清液的增值提供了有希望的方法。[GRAPHICS]。

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