Abstract This study was focused to synthesize silver nanoparticles (AgNps) from the aqueous extract of Bistorta amplexicaule and to evaluate their antimicrobial, antifungal, and 4-nitrophenol (4-NP) degradation potential. The AgNps from B. amplexicaule were characterized by field emission scanning electron microscopy, energy dispersive X-ray spectrometry, X-ray diffraction, and X-ray photoelectron spectroscopy studies. The biological activity of the AgNps was checked against the three bacterial and two fungal strains. The inhibition activities of the synthesized nanoparticles on pathogenic bacteria and fungi were equally studied using the colony-forming unit method. The AgNps synthesized showed excellent bactericidal and fungicidal activities against pathogenic Escherichia coli, Staphylococcus aureus, methicillin-resistant Staphylococcus aureus (MRSA), Candida albicans, and Candida tropicalis. The removal of nitrophenols is one of the most demanding tasks, due to their injurious impact on the health of the living organisms. The AgNps showed superior performance compared with the pure plant extract. The AgNps also displayed efficient catalytic ability in reducing toxic 4-NP into harmless 4-aminophenol in the presence of NaBH4 solution. Hence, the synthesized AgNps can be effectively used against bacterial and fungal infections and in the decontamination of 4-NP polluted water.

中文翻译：

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Bistorta amplexicaule 生物合成 AgNps 的催化性能：抗真菌、杀菌和减少致癌的 4-硝基苯酚

摘要 本研究的重点是从 Bistorta amplexicaule 的水提取物中合成银纳米粒子 (AgNps)，并评估其抗菌、抗真菌和 4-硝基苯酚 (4-NP) 降解潜力。来自 B. amplexicaule 的 AgNps 通过场发射扫描电子显微镜、能量色散 X 射线光谱法、X 射线衍射和 X 射线光电子能谱研究进行了表征。针对三种细菌和两种真菌菌株检查了 AgNps 的生物活性。使用菌落形成单位方法同样研究合成的纳米颗粒对病原菌和真菌的抑制活性。合成的 AgNps 对致病性大肠杆菌、金黄色葡萄球菌、耐甲氧西林金黄色葡萄球菌 (MRSA)、白色念珠菌和热带念珠菌。由于硝基苯酚对生物体的健康有害，因此去除硝基苯酚是最艰巨的任务之一。与纯植物提取物相比，AgNps 表现出优越的性能。在 NaBH4 溶液存在下，AgNps 还显示出有效的催化能力，将有毒的 4-NP 还原为无害的 4-氨基苯酚。因此，合成的 AgNps 可以有效地用于对抗细菌和真菌感染以及 4-NP 污染水的净化。在 NaBH4 溶液存在下，AgNps 还显示出有效的催化能力，将有毒的 4-NP 还原为无害的 4-氨基苯酚。因此，合成的 AgNps 可以有效地用于对抗细菌和真菌感染以及 4-NP 污染水的净化。在 NaBH4 溶液存在下，AgNps 还显示出有效的催化能力，将有毒的 4-NP 还原为无害的 4-氨基苯酚。因此，合成的 AgNps 可以有效地用于对抗细菌和真菌感染以及 4-NP 污染水的净化。