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Open AccessArticle

Voltammetry at Hexamethyl-P-Terphenyl Poly(Benzimidazolium) (HMT-PMBI)-Coated Glassy Carbon Electrodes: Charge Transport Properties and Detection of Uric and Ascorbic Acid

1
Systems and Process Engineering Centre, College of Engineering, Swansea University, Bay Campus, Crymlyn Burrows, Swansea SA1 8EN, UK
2
Department of Chemistry, Simon Fraser University, Burnaby, BC V5A 1S6, Canada
3
Centre for NanoHealth, Swansea University, Singleton Campus, Swansea SA2 8PP, UK
*
Author to whom correspondence should be addressed.
Sensors 2020, 20(2), 443; https://doi.org/10.3390/s20020443
Received: 24 November 2019 / Revised: 2 January 2020 / Accepted: 8 January 2020 / Published: 13 January 2020
(This article belongs to the Special Issue Nanomaterials for Sensors)
We describe the voltammetric behavior of an anion-exchange membrane, hexamethyl-p-terphenyl poly(benzimidazolium) (HMT-PMBI). The anion-exchange properties of HMT-PMBI chemically modified electrodes were investigated using K4Fe(CN)6 and K2IrCl6 as redox probes. The permselectivity properties of HMT-PMBI chemically modified electrodes were ascertained using tris(2-2’)bipyridyl-ruthenium(II) chloride Ru(bpy)32+. Cyclic voltammetry and chronoamperometry were utilized to extract parameters such as the concentration of the redox mediators inside the films and the apparent diffusion coefficients. We found the concentration of K4Fe(CN)6 and K2IrCl6 redox species within HMT-PMBI-coated films to be on the order of 0.04–0.1 mol·dm−3, and values of Dapp ca. 10−10–10−9 cm2·s−1. To evaluate the possibility of using such a polymer coating in electroanalysis, HMT-PMBI-modified electrodes were utilized for the voltammetric detection of uric acid in artificial urine, Surine® and ascorbic acid in Vitamin C samples. The results showed that HMT-PMBI-coated electrodes can detect uric acid in Surine® with a limit of detection (LoD) of 7.7 µM, sensitivity of 0.14 µA·µM−1·cm−2, and linear range between 5 μM and 200 μM, whereas for Vitamin C tablets, the LoD is 41.4 µM, the sensitivity is 0.08 µA·µM−1·cm−2, and the linear range is between 25 μM and 450 μM. View Full-Text
Keywords: chemically modified electrodes; voltammetry; sensors; uric acid; ascorbic acid; hexamethyl-p-terphenyl poly(benzimidazolium), anion exchange polymer chemically modified electrodes; voltammetry; sensors; uric acid; ascorbic acid; hexamethyl-p-terphenyl poly(benzimidazolium), anion exchange polymer
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MDPI and ACS Style

Rees, M.; Wright, A.G.; Holdcroft, S.; Bertoncello, P. Voltammetry at Hexamethyl-P-Terphenyl Poly(Benzimidazolium) (HMT-PMBI)-Coated Glassy Carbon Electrodes: Charge Transport Properties and Detection of Uric and Ascorbic Acid. Sensors 2020, 20, 443.

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