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Electrodeposited nanoporous ruthenium oxide for simultaneous quantification of ascorbic acid and uric acid using chronoamperometry at two different potentials

Title
Electrodeposited nanoporous ruthenium oxide for simultaneous quantification of ascorbic acid and uric acid using chronoamperometry at two different potentials
Authors
Yang, YejinJo, AraLee, YoungmiLee, Chongmok
Ewha Authors
이종목이영미
SCOPUS Author ID
이종목scopus; 이영미scopus
Issue Date
2018
Journal Title
SENSORS AND ACTUATORS B-CHEMICAL
ISSN
0925-4005JCR Link
Citation
vol. 255, pp. 316 - 324
Keywords
ElectrodepositionRuthenium dioxideAscorbic acidUric acidNonenzymatic amperometric sensor
Publisher
ELSEVIER SCIENCE SA
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
Nanoporous ruthenium dioxide (RuO2) was simply prepared by electrodeposition with potential cycling in RuCl3 solution in the presence of reverse micelles of Triton X-100. The electrodeposited RuO2 on Au substrate electrode showed high electroactivity for the oxidations of L-ascorbic acid (AA) and uric acid (UA), while AA oxidation started from a less positive potential compared to UA oxidation. Simultaneous quantitative analysis of AA and UA was successfully carried out via chronoamperometric measurements at two different applied potentials using RuO2 deposited electrode. Due to the oxidation potential difference between AA and UA at RuO2\ electrode, only AA was oxidized at an applied potential of 0.20 V vs. SCE and both AA and UA were oxidized at 0.32 V vs. SCE. AA concentration was determined from the current measured at 0.20 V; and then UA concentration was estimated from the current measured at 0.32 V using the predetermined AA concentration. Electrodeposited nanoporous RuO2 electrode exhibited current responses linearly proportional to AA and UA concentrations in a wide concentration range (0-1 mM) and fast response time (<= 1 s). The current sensitivities were 342.8 perpendicular to 26.3 mu A mM(-1) cm(-2) for AA at 0.20 V; 377.8 +/- 18.4 mu AmM-1 cm(-2) for AA at 0.32 V; and 344.2 +/- 11.6 mu AmM-1 cm(-2) for UA at 0.32 V. In addition, Ru02 electrode showed a high selectivity over interferents such as 4-acetamidophenol (AP), dopamine (DA), and glucose. Reasonable stability and repeatability of RuO2 electrode were also confirmed. Selective quantification of AA and UA in an arbitrary mixture and a human urine sample demonstrated that RuO2 electrode has practical utility in real sample analysis with satisfactory results. (C) 2017 Elsevier B.V. All rights reserved.
DOI
10.1016/j.snb.2017.08.089
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자연과학대학 > 화학·나노과학전공 > Journal papers
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