Bioresources Engineering Department, CSIR-Institute of Minerals & Materials Technology, Bhubaneswar, Orissa 751013, India.
Spectrochim Acta A Mol Biomol Spectrosc. 2013 Dec;116:424-7. doi: 10.1016/j.saa.2013.07.033. Epub 2013 Aug 1.
An aqueous leaf extract of Desmodium gangeticum was employed to synthesize silver nano particles. Rapid formation of stable silver nanoparticles were observed on exposure of the aqueous leaf extract with solution of silver nitrate. The silver nanoparticles were characterized by UV-visible spectroscopy, scanning electron microscopy, energy dispersive X-ray analysis and transmission electron microscopy (TEM), and Fourier Transform Infra-Red spectroscopy (FTIR) UV-visible spectroscopy, scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDAX), transmission electron microscopy (TEM), and Fourier Transform Infra-Red spectroscopy (FTIR). UV-visible spectrum of the aqueous medium peaked at 450 nm corresponding to the plasmon absorbance of silver nanoparticles. SEM analysis revealed the spherical shape of the particles with sizes ranging from 18 to 39 nm and the EDAX spectrum confirmed the presence of silver along with other elements in the plant metabolite. Further, these biologically synthesized nanoparticles were found to be highly toxic against pathogenic bacteria Escherichia coli, thus implying significance of the present study in production of biomedical products.
采用水黄皮 Desmodium gangeticum 的叶提取物来合成银纳米粒子。将水黄皮叶提取物与硝酸银溶液暴露于其中，即可快速形成稳定的银纳米粒子。通过紫外-可见光谱、扫描电子显微镜、能量色散 X 射线分析和透射电子显微镜（TEM）以及傅里叶变换红外光谱（FTIR）对银纳米粒子进行了表征。紫外-可见光谱在 450nm 处出现峰值，对应于银纳米粒子的等离子体吸收。扫描电子显微镜分析显示，粒子呈球形，粒径范围为 18 至 39nm，能谱分析（EDAX）证实了银以及植物代谢物中其他元素的存在。此外，这些生物合成的纳米粒子对致病性细菌大肠杆菌具有很高的毒性，因此本研究对于生物医学产品的生产具有重要意义。
