Abstract

Silver nanoparticles (Ag NPs) were synthesized using Alternanthera sessilis leaf and Oregano root extract in an eco-friendly fashion and their significant physicochemical and optochemical properties were ascertained for nano-defined characteristics. The UV–visible spectrum showed a single and distinct absorbance peak at 433 nm (Alternanthera sessilis) and 425 nm (Oregano), typical SPR (surface plasmon resonance) for silver. Structural studies revealed nano-crystal with face centre cubic (FCC) symmetry with monodispersed nature. SEM studies showed spherical-shaped particles and the purity determined from EDX spectrum. The synthesized Ag NPs showed that antibacterial activity was studied. There was a significant inhibitory effect toward clinically important pathogens viz. B. subtilis, S. aureus, P. aeruginosa, and E. coli exposed to Ag NPs at different concentrations.

Graphic abstract

中文翻译：

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环保方法合成银纳米颗粒并评估光学，表面形态和抗菌性能

摘要

银纳米颗粒（银纳米粒子）使用合成莲子草叶和牛至根提取物在生态环境友好的方式以及它们的显著物理化学和光化学性质确定用于纳米限定的特性。紫外可见光谱在433 nm（Alternanthera sessilis）和425 nm（Oregano）处显示一个唯一的吸收峰），银的典型SPR（表面等离子体共振）。结构研究显示具有面心立方（FCC）对称性且具有单分散性质的纳米晶体。SEM研究表明，球形颗粒的纯度由EDX光谱确定。合成的Ag NPs表现出对抗菌活性的研究。对临床上重要的病原体有明显的抑制作用。枯草芽孢杆菌，金黄色葡萄球菌，铜绿假单胞菌和大肠杆菌暴露于不同浓度的银纳米颗粒。

图形摘要