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Sensors 2018, 18(3), 814; https://doi.org/10.3390/s18030814

Design and Characterization of Dicyanovinyl Reactive Dyes for the Colorimetric Detection of Thiols and Biogenic Amines

1
Faculty of Mechanical Engineering, University of Maribor, Smetanova 17, SI-2000 Maribor, Slovenia
2
Institute for Environmental Protection and Sensors, Beloruska 7, SI-2000 Maribor, Slovenia
3
JOANNEUM RESEARCH Forschungsgesellschaft mbH—Materials, Franz-Pichler-Straße 30, A-8160 Weiz, Austria
*
Author to whom correspondence should be addressed.
Received: 31 January 2018 / Revised: 22 February 2018 / Accepted: 1 March 2018 / Published: 8 March 2018
(This article belongs to the Section Chemical Sensors)
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Abstract

The synthesis of two new azobenzene dyes, namely CR-528 and CR-555, and their spectral properties in ethanol solution are described. The recognition of sulfur-containing analytes (2-mercaptoethanol (2-ME), sodium hydrosulfide (NaHS)), and biogenic amines (spermine, spermidine, ethanolamine) bestowed significant spectral changes with color changes from pink/purple to pale yellow/orange-yellow. The nitro acceptor group in the dicyanovinyl reactive dye contributes to higher sensitivity and lower detected analyte concentrations. The absorption maxima of both the dyes are at wavelengths compatible with low-cost light sources and detectors, making them excellent candidates for optical probes that are economic, simple to use, and do not require well-trained personnel. View Full-Text
Keywords: indicator dye; chromoreactand; absorption; thiols; biogenic amines indicator dye; chromoreactand; absorption; thiols; biogenic amines
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Mastnak, T.; Lobnik, A.; Mohr, G.J.; Turel, M. Design and Characterization of Dicyanovinyl Reactive Dyes for the Colorimetric Detection of Thiols and Biogenic Amines. Sensors 2018, 18, 814.

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