期刊
ANALYTICA CHIMICA ACTA
卷 787, 期 -, 页码 189-192出版社
ELSEVIER
DOI: 10.1016/j.aca.2013.05.020
关键词
Aptamer; Potassium ion; Gold nanoparticle; Colorimetric detection
资金
- Capital Normal University [02512530360009]
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.
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