金钱草多糖介导的银纳米粒子绿色合成及表征

利用金钱草多糖为还原剂和稳定剂,经前驱体还原法绿色合成了银纳米粒子,考查反应温度、反应时间、前驱体浓度及pH值对银纳米生成的影响,采用紫外光谱和透射电镜对银纳米分散液进行表征和分析。结果表明,中性环境下温度升高至70℃时,多糖呈现出一定的还原能力,随反应时间和前驱体比例的增加,体系中银纳米浓度增强;pH值是影响多糖还原性和银纳米生成速率的关键因素,碱性环境下有利于小粒径、单分散性银纳米的生成,金钱草多糖包覆的银纳米具有优良的储存稳定性。

Lysimachia christinae Polysaccharide Mediated Green Synthesis of Silver Nanoparticle

Silver nanoparticles have been synthesized through a facile and green precursor reduction method by using Lysimachia christinae polysaccharide as both reductant and stabilizer.The effect of reaction temperature,reaction time,precursor concentration and pH value on the formation of silver nanoparticles were investigated.The synthesized silver nanoparticles were characterized and analyzed by ultraviolet spectroscopy and transmission electron microscopy.The results showed that the polysaccharide began to exhibit reducing ability when the temperature raised to 70℃.The concentration of silver nanoparticles in the reaction system increased with the increase of reaction time and proportion of precursors.pH was a key factor affecting the reducibility of polysaccharides and the formation rate of silver nanoparticles.Alkaline environment was conducive to the formation of small sized and monodispersed silver nanoparticles.Moreover,Lysimachia christinae polysaccharide stabilized silver nanoparticles have excellent storage stability.