In this study, biogenic silver nanoparticles (AgNPs) and gold nanoparticles (AuNPs) were synthesized by a green approach using an aqueous extract from Codonopsis pilosula (CP) roots as a reducing and stabilizing agent. The formation of CP-AgNPs and CP-AuNPs was confirmed and optimized by UV-Vis spectroscopy. The CP-AgNPs and CP-AuNPs obtained under optimum conditions of metal ion concentration, reaction temperature, and reaction time were characterized by high-resolution transition electron microscopy (HR-TEM), selected area electron diffraction (SAED) analysis, field-emission scan electron microscopy (FE-SEM), powder X-ray diffraction (XRD) analysis, Fourier transform infrared (FTIR) spectroscopy, dispersive X-ray spectroscopy (EDX), and dynamic light scattering (DLS) method. It has been found that the biosynthesized CP-AgNPs and CP-AuNPs were formed in spherical shape with an average size of and , respectively. The biosynthesized metallic nanoparticles exhibited selective bacterial activity against three bacterial strains including two Gram-positive bacteria of Bacillus subtilis and Staphylococcus aureus and one Gram-negative bacteria of Escherichia coli. Meanwhile, there was no antibacterial activity detected toward Gram-negative Salmonella enteritidis. CP-AgNPs and CP-AuNPs also manifested an excellent catalytic performance in the reduction of 1,4-dinitrobenzene, 2-nitrophenol, 3-nitrophenol, and 4-nitrophenol.

中文翻译：

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党参党参根提取物用于抗菌和催化生物合成银和金纳米粒子

在这项研究中，使用党参党参的水提取物通过绿色方法合成了生物型银纳米颗粒（AgNPs）和金纳米颗粒（AuNPs）。（CP）可以作为还原剂和稳定剂。CP-AgNPs和CP-AuNPs的形成已通过UV-Vis光谱法确认并优化。通过高分辨率过渡电子显微镜（HR-TEM），选择区电子衍射（SAED）分析，场发射对在金属离子浓度，反应温度和反应时间的最佳条件下获得的CP-AgNPs和CP-AuNPs进行了表征扫描电子显微镜（FE-SEM），粉末X射线衍射（XRD）分析，傅立叶变换红外（FTIR）光谱，色散X射线光谱（EDX）和动态光散射（DLS）方法。已经发现生物合成的CP-AgNP和CP-AuNP形成为球形，平均大小为 和 ，分别。生物合成的金属纳米颗粒对三种细菌菌株表现出选择性的细菌活性，包括两株枯草芽孢杆菌和金黄色葡萄球菌的革兰氏阳性菌和一株大肠杆菌的革兰氏阴性菌。同时，未检测到对革兰氏阴性肠炎沙门氏菌的抗菌活性。CP-AgNPs和CP-AuNPs在还原1,4-二硝基苯，2-硝基苯酚，3-硝基苯酚和4-硝基苯酚方面也表现出出色的催化性能。