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Issue 10, 2016
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Strong base pre-treatment for colorimetric sensor array detection and identification of N-methyl carbamate pesticides

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Abstract

Colorimetric sensor arrays demonstrate numerous superior features in chemo- and bio-sensing, but they are generally not applicable to less-reactive analytes. Based on the findings that N-methyl carbamate pesticides could be decomposed into reactive phenols in basic media, herein, a novel strategy of strong base pre-treatment was developed and employed for the colorimetric sensor array detection and differentiation of the N-methyl carbamate pesticides in an indirect manner. With the use of five inexpensive and commercially available phenol responsive indicators, such a colorimetric sensor array can be facilely fabricated. Classification analysis (e.g. hierarchical clustering analysis (HCA) and principal component analysis (PCA)) reveals that the as-fabricated sensor array has an extremely high dimensionality and, consequently, exhibits excellence in discriminating a variety of N-methyl carbamates from other types of pesticides and potential interferants, and further identifying them exactly from each other. Moreover, semi-quantitative detection could also be achieved through combining HCA/PCA, recognition patterns, and corresponding fitting curves. Overall, the as-developed method exhibits high selectivity and sensitivity, good anti-interference, simultaneous detection and identification capability for each of the N-methyl carbamate pesticides, and potential applicability in real samples. Most importantly, this study demonstrates that pre-treatment strategies are very effective in expanding the range of applications of colorimetric sensor array methodology to less-reactive analytes.

Graphical abstract: Strong base pre-treatment for colorimetric sensor array detection and identification of N-methyl carbamate pesticides

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Supplementary files

Article information


Submitted
03 Dec 2015
Accepted
08 Jan 2016
First published
13 Jan 2016

RSC Adv., 2016,6, 7902-7907
Article type
Paper

Strong base pre-treatment for colorimetric sensor array detection and identification of N-methyl carbamate pesticides

S. Qian, Y. Leng and H. Lin, RSC Adv., 2016, 6, 7902
DOI: 10.1039/C5RA25805G

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