文献类型：期刊文献

英文题名：Colorimetric detection of potassium ions using aptamer-functionalized gold nanoparticles

作者：Chen, Zhengbo[1];Huang, Yanqin[2];Li, Xiaoxiao[1];Zhou, Tong[1];Ma, He[1];Qiang, Hong[1];Liu, Yifei[1]

第一作者：Chen, Zhengbo

通讯作者：Chen, ZB[1]

机构：[1]Capital Normal Univ, Dept Chem, Beijing 100048, Peoples R China;[2]Xinxiang Univ, Coll Chem & Chem Engn, Xinxiang 453003, Peoples R China

第一机构：Capital Normal Univ, Dept Chem, Beijing 100048, Peoples R China

通讯机构：[1]corresponding author), 105 West 3rd Ring Rd North, Beijing 100048, Peoples R China.

年份：2013

卷号：787

起止页码：189-192

外文期刊名：ANALYTICA CHIMICA ACTA

收录：;EI(收录号：20132816497241);Scopus(收录号：2-s2.0-84879880022);WOS:【SCI-EXPANDED(收录号:WOS:000321497400023)】；

基金：This work was financially supported by Dr. start-up capital of Capital Normal University (02512530360009).

语种：英文

外文关键词：Aptamer; Potassium ion; Gold nanoparticle; Colorimetric detection

摘要：Herein, a simple and novel colorimetric method for detection of potassium ions (K+) was developed. The colorimetric experiments revealed that upon the addition of K+, the conformation of anti-K+ aptamer in solution changed from random coil structure to compact rigid G-quadruplex one. This compact rigid G-quadruplex structure could not protect AuNPs against K+-induced aggregation, and thus the visible color change from wine-red to blue-purple could be observed by the naked eye. The linear range of the colorimetric aptasensor covered a large variation of K+ concentration from 5 nM to 1 mu M and the detection limit of 5 nM was obtained. Moreover, this assay was able to detect K+ with high selectivity and had great potential applications. Crown Copyright (C) 2013 Published by Elsevier B.V. All rights reserved.