Miniaturized optical chemosensor for flow-based assays |
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Authors: | Marta Pokrzywnicka David J Cocovi-Solberg Manuel Miró Víctor Cerdà Robert Koncki ?ukasz Tymecki |
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Institution: | (1) Department of Chemistry, University of Warsaw, Pasteura 1, 02-093 Warsaw, Poland;(2) Department of Chemistry, University of the Balearic Islands, Carretera de Valldemosa km 7.5, 07122 Palma de Mallorca, Spain; |
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Abstract: | A cost-effective, highly compact, and versatile optoelectronic device constructed of two ordinary light emitting diodes compatible
with optosensing films has been developed. This fibreless device containing chemoreceptor, semiconductor light source, and
detector integrated in a miniaturized flow-through cell of low microliter internal volume works as a complete photometric
chemical sensor suitable for detection in flow analysis. The operation of the developed device under nonstationary programmable-flow
conditions offered by sequential injection analysis has been demonstrated using Prussian Blue film as a model optical chemoreceptor.
The unique spectroelectrochemical properties of the sensing material enable its use for optical sensing of redox species,
whereby ascorbic acid and hydrogen peroxide have been chosen as model analytes. The reported SI-sensor system features fast
and reproducible determination of both analytes in the submillimolar range of concentrations. The construction concept demonstrated
in this work can be easily applied to other kinds of optical sensors based on absorbance sensing films. |
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