Jump to main content
Jump to site search
Access to RSC content Close the message box

Continue to access RSC content when you are not at your institution. Follow our step-by-step guide.


Issue 3, 2018
Previous Article Next Article

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

Author affiliations

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

Back to tab navigation

Supplementary files

Article information


Submitted
02 Dec 2017
Accepted
20 Dec 2017
First published
20 Dec 2017

Analyst, 2018,143, 678-686
Article type
Paper

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

Social activity

Search articles by author

Spotlight

Advertisements