Synthesizing nanoparticles with the less environmentally malignant approach using plant extract is of great interest; this is because most of the chemical approaches can be very costly, toxic, and time-consuming. Herein, we report the use of Acacia senegal leaf extracts to synthesize silver nanoparticles (AgNPs) using an environmentally greener approach. Silver ions were reduced using the bioactive components of the plant extracts with observable colour change from faint colourless to a brownish solution as indication of AgNP formation. The structural properties of the as-synthesized AgNPs were characterized using powder X-ray diffraction (XRD), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), and UV-Vis absorption spectrum. Antimicrobial assessment of the as-synthesized AgNPs was explored on some strains of gram-positive and gram-negative bacteria. The obtained results indicate that the as-synthesized AgNPs are pure crystallite of cubic phase of AgNPs, fairly dispersed with a size range of 10–19 nm. The AgNPs were found to be small in size and exhibit significant antibacterial activities, suggesting that the as-synthesized AgNPs could be used in the pharmaceutical and food industries as bactericidal agents.

中文翻译：

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阿拉伯树胶提取物功能化银纳米粒子的生物启发合成及其抗菌性评价

使用植物提取物以较少的环境恶性方法合成纳米粒子备受关注。这是因为大多数化学方法可能非常昂贵，有毒且耗时。在此，我们报告塞内加尔相思树的使用叶提取物可以使用环保的方法合成银纳米颗粒（AgNP）。使用植物提取物的生物活性成分还原了银离子，可观察到的颜色变化从微弱的无色变为棕褐色，可指示出AgNP的形成。使用粉末X射线衍射（XRD），透射电子显微镜（TEM），傅立叶变换红外光谱（FTIR）和UV-Vis吸收光谱对合成后的AgNP的结构特性进行了表征。研究了一些革兰氏阳性和革兰氏阴性细菌菌株对合成后的AgNPs的抗菌评估。得到的结果表明，合成后的AgNP是AgNPs立方相的纯微晶，分布范围为10-19 nm。