Synthesis of metallic nanoparticles using secondary metabolites present in plant extracts has attracted attention. In this study, Lantana trifolia aqueous extracts were used to synthesize silver nanoparticles (AgNPs) which were then screened for their antimicrobial activity. The morphology, size and functional groups present in AgNPs was evaluated using electron microscopy and Fourier transform infrared spectroscopy (FT-IR). The role of temperature, reaction time and concentration of precursor ion were evaluated by measuring the surface plasmon resonance of AgNPs using UV–Vis spectroscopy. The crystal structure, hydrodynamic diameters and redox potential were evaluated using powder X-ray diffractometer (PWXRD), dynamic light scattering (DLS) and cyclic voltammetry respectively. The data obtained in this study revealed that increase in the reaction time led to an increase in surface plasmon resonance of AgNPs while the increase in temperature from 20 to 35 ℃ increased the rate of AgNPs synthesis. The XRD diffractogram revealed that the particles were composed of silver with 2θ = 38.36, 44.428, 54.89, and 57.87, corresponding to the silver crystal planes of (111), (200), (220), and (311). The diameters of the nanoparticles were between 35 and 70 nm, and they had moderate antimicrobial activity against E. coli, P. aeruginosa, C. albicans, S. aureus and B. subtilis.

中文翻译：

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马Lan丹水提物快速合成银纳米粒子及其抗菌活性

利用植物提取物中存在的次生代谢物合成金属纳米颗粒引起了人们的关注。在这项研究中，马Lan丹水提取物用于合成银纳米粒子（AgNPs），然后对其抗菌活性进行筛选。使用电子显微镜和傅立叶变换红外光谱（FT-IR）对AgNPs中存在的形态，大小和官能团进行了评估。温度，反应时间和前体离子浓度的作用通过使用UV-Vis光谱法测量AgNPs的表面等离子体共振来评估。分别使用粉末X射线衍射仪（PWXRD），动态光散射（DLS）和循环伏安法评估晶体结构，流体力学直径和氧化还原电势。这项研究获得的数据表明，反应时间的增加导致AgNPs表面等离子体激元共振的增加，而温度从20℃升高到35℃则增加了AgNPs的合成速率。XRD衍射图表明，颗粒由2θ= 38.36、44.428、54.89和57.87的银组成，对应于（111），（200），（220）和（311）的银晶面。纳米粒子的直径在35到70 nm之间，并且具有中等的抗菌活性大肠杆菌，铜绿假单胞菌，白色念珠菌，金黄色葡萄球菌和枯草芽孢杆菌。