应用化学

• 研究论文 • 上一篇    下一篇

基于巯基嘌呤/多肽修饰的金纳米粒子的比色方法检测溶液中的镉离子

朱志军1,2,刘殿骏1,王振新2*   

  1. (1.中国科学院长春应用化学研究所,电分析国家重点实验室 长春130022;2.中国科学院大学 北京100039)
  • 收稿日期:2012-08-23 修回日期:2012-09-24 出版日期:2013-06-10 发布日期:2013-06-10
  • 通讯作者: 王振新,教授; Tel/Fax:0431-85262243; E-mail:wangzx@ciac.jl.cn; 研究方向:生物分析和分子相互作用
  • 基金资助:
    吉林省科技厅科技发展计划基金(20100701)资助项目

A Simple Colorimetric Assay for Detection of Cadmium Ion Based on 6-Mercaptopurine/peptide Functionalized Gold Nanoparticles

ZHU Zhijun1,2, LIU Dianjun1, WANG Zhenxin1*   

  1. (1.State Key Laboratory of Electroanalytical Chemistry,Changchun Institute of
    Applied Chemistry,Changchun 130022,China;
    2.University of Chinese Academy of Sciences,Beijing 100039,China)
  • Received:2012-08-23 Revised:2012-09-24 Published:2013-06-10 Online:2013-06-10
  • Contact: zhenxin

摘要: 研究了一种基于双配体(巯基嘌呤(MP)和多肽CALNN)修饰金纳米粒子(AuNPs)的比色方法,用于快速、选择性地检测水溶液中的Cd2+。 其中,MP作为功能配体通过N原子与Cd2+发生配合作用,从而引起AuNPs聚集;CALNN配体有助于提高体系的稳定性和选择性。 当体系中无Cd2+时,溶液呈红色,随着Cd2+浓度的增加,溶液颜色逐渐由红色变为蓝紫色,这种颜色变化可以通过光谱测定还可以用肉眼直接观察。 该方法操作简便,具有较好的选择性和较快的响应速度(<5 min),其检测限达到350 nmol/L。

关键词: 金纳米粒子, 比色法, Cd2+, 巯基嘌呤

Abstract: A simple colorimetric assay for rapid and selective sensing toxic heavy metal ion, cadmium ion(Cd2+), has been developed using gold nanoparticles(AuNPs) decorated with 6-mercaptopurine(MP) and peptide CALNN. MP is employed as a chelating ligand through the N group at the end of MP, and CALNN is served not only as a stabilizer, but also as a factor of high selectivity. AuNPs solution exhibits a gradual color change from red to blue with increasing the concentration of Cd2+, which leads to an easily measurable change in absorption spectrum of AuNPs solution and naked eye detection. A simple assay with high selectivity and fast response(within 5 min) is presented, and the limit of detection(LOD) for Cd2+ was calculated to be 350 nmol/L.

Key words: Gold nanoparticles, Colorimetric assay, Cadmium ion, Mercaptopurine

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