Bio-Organic Chemistry Lab, Department of Chemistry, Visva-Bharati University, Santiniketan 731 235, W.B., India.
Colloids Surf B Biointerfaces. 2011 Feb 1;82(2):497-504. doi: 10.1016/j.colsurfb.2010.10.007. Epub 2010 Oct 12.
In this paper, we have demonstrated for the first time, the superb efficiency of aqueous extract of dried leaves of mahogany (Swietenia mahogani JACQ.) in the rapid synthesis of stable monometallic Au and Ag nanoparticles and also Au/Ag bimetallic alloy nanoparticles having spectacular morphologies. Our method was clean, nontoxic and environment friendly. When exposed to aqueous mahogany leaf extract, competitive reduction of Au(III) and Ag(I) ions present simultaneously in same solution leads to the production of bimetallic Au/Ag alloy nanoparticles. UV-visible spectroscopy was used to monitor the kinetics of nanoparticles formation. UV-visible spectroscopic data and TEM images revealed the formation of bimetallic Au/Ag alloy nanoparticles. Mahogany leaf extract contains various polyhydroxy limonoids which are responsible for the reduction of Au(III) and Ag(I) ions leading to the formation and stabilization of Au and Ag nanopaticles.
本文首次证明了桃花心木（Swietenia mahogani JACQ.）干叶的水提物在快速合成稳定的单金属 Au 和 Ag 纳米粒子以及具有壮观形态的 Au/Ag 双金属合金纳米粒子方面的超高效率。我们的方法清洁、无毒且对环境友好。当暴露于桃花心木叶的水溶液中时，同时存在于同一溶液中的 Au(III)和 Ag(I)离子的竞争还原导致产生双金属 Au/Ag 合金纳米粒子。紫外-可见光谱用于监测纳米粒子形成的动力学。紫外-可见光谱数据和 TEM 图像显示了双金属 Au/Ag 合金纳米粒子的形成。桃花心木叶提取物含有各种多羟基柠檬素，这些柠檬素负责还原 Au(III)和 Ag(I)离子，从而形成和稳定 Au 和 Ag 纳米粒子。
