Silver ions (Ag⁺) and its compounds are highly toxic to microorganisms, exhibiting strong biocidal effects on many species of bacteria but have a low toxicity toward animal cells. In the present study, silver nanoparticles (SNPs) were biosynthesized using aqueous extract of Chlorella vulgaris as reducing agent and size of SNPs synthesized ranged between 15 and 47 nm. SNPs were characterized by UV–visible spectroscopy, scanning electron microscopy, transmission electron microscopy, X-ray diffraction and Fourier infrared spectroscopy, and analyzed for its antibacterial property against human pathogens. This approach of SNPs synthesis involving green chemistry process can be considered for the large-scale production of SNPs and in the development of biomedicines.

中文翻译：

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银纳米粒子的绿色合成：抗菌能力的表征和测定。

银离子（Ag ⁺）及其化合物对微生物有很高的毒性，对许多细菌都具有很强的杀菌作用，但对动物细胞的毒性却很低。在本研究中，使用寻常小球藻的水提取物作为还原剂生物合成了银纳米颗粒（SNP），合成的SNP大小在15至47 nm之间。通过紫外可见光谱，扫描电子显微镜，透射电子显微镜，X射线衍射和傅里叶红外光谱对SNP进行了表征，并分析了其对人类病原体的抗菌性能。这种涉及绿色化学过程的SNP合成方法可以考虑用于SNP的大规模生产和生物医学的发展。