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PVC-Based Ion-Selective Electrodes with a Silicone Rubber Outer Coating with Improved Analytical Performance
Åbo Akademi University, Johan Gadolin Process Chemistry Centre, Laboratory of Analytical Chemistry, Biskopsgatan 8, Åbo Turku, FI-20500, Finland.
Åbo Akademi University, Johan Gadolin Process Chemistry Centre, Laboratory of Analytical Chemistry, Biskopsgatan 8, Åbo Turku, FI-20500, Finland.
Malmö University, Faculty of Health and Society (HS), Department of Biomedical Science (BMV). Malmö University, Biofilms Research Center for Biointerfaces.ORCID iD: 0000-0003-0304-7528
Åbo Akademi University, Johan Gadolin Process Chemistry Centre, Laboratory of Analytical Chemistry, Biskopsgatan 8, Åbo Turku, FI-20500, Finland.
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2019 (English)In: Analytical Chemistry, ISSN 0003-2700, E-ISSN 1520-6882, Vol. 91, no 16, p. 10524-10531Article in journal (Refereed) Published
Abstract [en]

An outer layer of pure silicone rubber (SR), i.e. SR without any plasticizer, ionophore, or lipophilic anion, was applied on top of a conventional poly(vinyl chloride) (PVC) based K+-selective membrane in a solid-contact ion-selective electrode (SC-ISE). The influence of the outer SR coating on the analytical performance of the K+-ISEs was studied. The presence of the SR coating did not affect the selectivity of the SC-ISE, indicating that the plasticizer, ionophore, and lipophilic anion are spontaneously distributed from the PVC-based membrane into the SR layer. This was confirmed by electrochemical impedance spectroscopy (EIS). Interestingly, the reproducibility of the standard potential of the conditioned SC-ISE was significantly improved from E-0 +/- 35.3 mV to E-0 +/- 3.5 mV simply by adding the SR coating on top of the plasticized PVC based K+-selective membrane. Moreover, the adsorption of bovine serum albumin (BSA) was significantly reduced at the SR coated ion-selective membrane. Thus, the addition of a SR coating on a plasticized PVC ion-selective membrane seems to be a feasible method to improve the analytical performance and to reduce the biofouling of potentiometric ion sensors.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2019. Vol. 91, no 16, p. 10524-10531
Keywords [en]
Chemistry, Analytical
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:mau:diva-4065DOI: 10.1021/acs.analchem.9b01490ISI: 000482545300027PubMedID: 31333015Scopus ID: 2-s2.0-85070878057Local ID: 30523OAI: oai:DiVA.org:mau-4065DiVA, id: diva2:1400889
Available from: 2020-02-28 Created: 2020-02-28 Last updated: 2024-06-17Bibliographically approved

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