Chemically modified electrodes for electrochemical detection of dopamine in the presence of uric acid and ascorbic acid: A review

2016 ◽  
Vol 76 ◽  
pp. 15-29 ◽  
Author(s):  
Muhammad Sajid ◽  
Mazen Khaled Nazal ◽  
Muhammad Mansha ◽  
Abdulnaser Alsharaa ◽  
Shehzada Muhammad Sajid Jillani ◽  
...  
Keyword(s):  
Ascorbic Acid ◽  
Uric Acid ◽  
Electrochemical Detection ◽  
Modified Electrodes ◽  
Chemically Modified Electrodes ◽  
Chemically Modified

scholarly journals 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 ◽  
Vol 20 (2) ◽  
pp. 443
Author(s):  
Rees ◽  
Wright ◽  
Holdcroft ◽  
Bertoncello
Keyword(s):  
Ascorbic Acid ◽  
Uric Acid ◽  
Vitamin C ◽  
Anion Exchange ◽  
Limit Of Detection ◽  
Modified Electrodes ◽  
Chemically Modified Electrodes ◽  
Linear Range ◽  
Chemically Modified ◽  
Voltammetric Detection

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.

scholarly journals Quaternary phosphonium-based (TPQPCl)-ionomer/graphite nanoplatelets composite chemically modified electrodes: a novel platform for sensing applications

2018 ◽  
Vol 6 (48) ◽  
pp. 13293-13304 ◽  
Author(s):  
Sandra Hernandez-Aldave ◽  
Robert B. Kaspar ◽  
Michael P. Letterio ◽  
Afshin Tarat ◽  
Yushan Yan ◽  
...  
Keyword(s):  
Ascorbic Acid ◽  
Amperometric Detection ◽  
Modified Electrodes ◽  
Chemically Modified Electrodes ◽  
Graphite Nanoplatelets ◽  
Chemically Modified ◽  
Sensing Applications ◽  
Sensing Platform ◽  
Coated Electrodes

Ionomer (TPQPCl)/graphite nanoplatelet-coated electrodes are developed as a new sensing platform for amperometric detection of ascorbic acid.

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