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Issue 3, 2018
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Implementation of a plasticized PVC-based cation-selective optode system into a paper-based analytical device for colorimetric sodium detection

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Abstract

On the example of a colorimetric sodium assay, this work demonstrates the implementation of a classical cation-exchange optode relying on an ionophore-doped plasticized PVC membrane into a paper-based analytical device (PAD). An ion-selective optode (ISO) system has been arranged into a vertically-assembled PAD (vPAD) integrating a pH-buffering function. Capillary force-driven sample liquid transportation through the paper matrix enabled pH-adjustment prior to the optical detection of the analyte cation. Functionalized paper layers with inkjet-deposited ISO membranes were combined with whole device lamination to attain a stable ion-exchange equilibrium required for the theoretical behavior of ISOs. Whole device lamination limited rapid evaporation of sample liquid on vPADs to avoid an increase of target concentration. Sigmoidal response curves between 10−5 and 1 M of Na+ at pH 5.0–7.0 have been confirmed on vPADs, following the theory defined by the cation-exchange equilibrium reaction. Finally, the influence of the cellulosic paper substrate matrix acting as a cation-exchanger on the optode response behavior has been evaluated and compared with conventional plastic film optodes.

Graphical abstract: Implementation of a plasticized PVC-based cation-selective optode system into a paper-based analytical device for colorimetric sodium detection

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Publication details

The article was received on 02 Dec 2017, accepted on 20 Dec 2017 and first published on 20 Dec 2017


Article type: Paper
DOI: 10.1039/C7AN01952A
Citation: Analyst, 2018,143, 678-686
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    Implementation of a plasticized PVC-based cation-selective optode system into a paper-based analytical device for colorimetric sodium detection

    H. Shibata, T. G. Henares, K. Yamada, K. Suzuki and D. Citterio, Analyst, 2018, 143, 678
    DOI: 10.1039/C7AN01952A

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