Centre for Interdisciplinary Research, Directorate of Research, SRM University, Kattankulathur, Tamilnadu, India.
Int J Nanomedicine. 2011;6:1265-78. doi: 10.2147/IJN.S18347. Epub 2011 Jun 21.
We used an aqueous leaf extract of Memecylon edule (Melastomataceae) to synthesize silver and gold nanoparticles. To our knowledge, this is the first report where M. edule leaf broth was found to be a suitable plant source for the green synthesis of silver and gold nanoparticles. On treatment of aqueous solutions of silver nitrate and chloroauric acid with M. edule leaf extract, stable silver and gold nanoparticles were rapidly formed. The gold nanoparticles were characterized by UV-visible spectroscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy dispersive X-ray analysis (EDAX) and Fourier transform infra-red spectroscopy (FTIR). The kinetics of reduction of aqueous silver and gold ions during reaction with the M. edule leaf broth were easily analyzed by UV-visible spectroscopy. SEM analysis showed that aqueous gold ions, when exposed to M. edule leaf broth, were reduced and resulted in the biosynthesis of gold nanoparticles in the size range 20-50 nm. TEM analysis of gold nanoparticles showed formation of triangular, circular, and hexagonal shapes in the size range 10-45 nm. The resulting silver nanoparticles were predominantly square with uniform size range 50-90 nm. EDAX results confirmed the presence of triangular nanoparticles in the adsorption peak of 2.30 keV. Further FTIR analysis was also done to identify the functional groups in silver and gold nanoparticles. The characterized nanoparticles of M. edule have potential for various medical and industrial applications. Saponin presence in aqueous extract of M. edule is responsible for the mass production of silver and gold nanoparticles.
我们使用桃金娘科植物 Memecylon edule 的水提物来合成银和金纳米粒子。据我们所知，这是首次报道发现 M. edule 叶肉汤是用于绿色合成银和金纳米粒子的合适植物来源。在处理硝酸银和氯金酸的水溶液时，迅速形成了稳定的银和金纳米粒子。金纳米粒子通过紫外-可见光谱、扫描电子显微镜 (SEM)、透射电子显微镜 (TEM)、能量色散 X 射线分析 (EDAX) 和傅里叶变换红外光谱 (FTIR) 进行了表征。通过紫外-可见光谱可以很容易地分析与 M. edule 叶肉汤反应过程中还原水溶液中银和金离子的动力学。SEM 分析表明，当暴露于 M. edule 叶肉汤时，金离子被还原，导致金纳米粒子在 20-50nm 的范围内合成。金纳米粒子的 TEM 分析表明，在 10-45nm 的范围内形成了三角形、圆形和六边形的形状。得到的银纳米粒子主要是正方形，均匀尺寸范围为 50-90nm。EDAX 结果证实了在 2.30keV 的吸附峰处存在三角形纳米粒子。还进行了进一步的 FTIR 分析，以鉴定银和金纳米粒子中的官能团。M. edule 表征的纳米粒子具有在各种医疗和工业应用中的潜力。M. edule 水提物中的皂素负责银和金纳米粒子的大规模生产。
