聚乙烯吡咯烷酮保护的纳米银可视化检测三聚氰胺  

Visualized Detection of Melamine by Polyvinylpyrrolidone Protected Silver Nanoparticles

作　　者：唐建[1] 陈述[1] 李春娟[1] 龙云飞[1] 

机构地区：[1]湖南科技大学化学化工学院理论化学与分子模拟省部共建教育部重点实验室,湖南湘潭411201

出　　处：《分析科学学报》2017年第2期207-211,共5页Journal of Analytical Science

基　　金：国家自然科学基金(No.21275047)

摘　　要：本文在聚乙烯吡咯烷酮(PVP)保护下制得银纳米粒子(AgNPs),当在pH为8.69的B-R缓冲溶液条件下,向AgNPs溶液中加入三聚氰胺后,AgNPs在392nm波长处的吸光度降低,并在长波处出现新的吸收峰,且AgNPs在392nm处的吸光度降低值(△A)与三聚氰胺的浓度呈现良好的线性关系。基于此,建立了一种灵敏检测三聚氰胺的方法,线性范围为5.0×10^(-8)~2.0×10^(-6) mol/L(相关系数r=0.9951)。三聚氰胺的浓度在0.1×10^(-6)~2.0×10^(-6) mol/L范围,AgNPs溶液的颜色变化可以直接用肉眼分辨,由此可以建立一种三聚氰胺的可视化半定量检测方法。建立的方法能用于合成样品和牛奶中三聚氰胺含量的检测。Silver nanoparticles（AgNPs）were prepared under the protection of polyvinylpyrrolidone（PVP）.When melamine was added to the AgNPs solution,the aggregation of AgNPs leads to the reduction of the absorbance of the AgNPs solution at the maximum absorption peak of 392 nm,and the absorption peak was red shifted with the change of the melamine concentration.Based on these phenomena,a sensitive method for detection of melamine was established.Melamine could be selectively detected in the range of 5.0×10-8-2.0×10-6 mol/L.The linear equation for melamine detection is △A=0.01574＋0.2266 c,and the correlation coefficient is 0.9951.Furthermore,a visualized method for melamine detection was established in the range of 0.1×10-6-2.0×10-6 mol/L,which could be applied in the detection of melamine in synthetic and milk samples.

关 键 词：银纳米粒子 吸光度 三聚氰胺 

分 类 号：O657.32[理学—分析化学]