Herein, we develop a rapid, sensitive and selective approach for
the colorimetric detection of DA using AuNPs, with theoretical simplicity
and low technical demands. In alkaline solution, DA capps and
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Talanta
http://dx.doi.org/10.1016/j.talanta.2015.02.038
0039-9140/Crown Copyright & 2015 Published by Elsevier B.V. All rights reserved.
n Corresponding author.
E-mail address: ymleng@nynu.edu.cn (Y. Leng).
Talanta 139 (2015) 89–95
aggregates AuNPs (DA-AuNPs) due to the covalent and noncovalent interactions between DA and AuNPs The DA-AuNPs are modified by the hydrolysate of thioglycolic acid (TGA2) through Au–S bonds. Due to the strong hydrogen-bonds (NH⋯OC and OH⋯OC) formed between TGA2 and DA, the AuNPs are further aggregated With the increase of DA concentrations, the color of AuNPs gradually changes from an initial red to purple, then gray and finally yellow