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Selective electrochemical sensor based on the electropolymerized p-coumaric acid for the direct determination of L-cysteine

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dc.date.accessioned 2019-01-22T20:32:19Z
dc.date.available 2019-01-22T20:32:19Z
dc.date.issued 2018
dc.identifier.issn 0013-4686
dc.identifier.uri https://dspace.kpfu.ru/xmlui/handle/net/147613
dc.description.abstract © 2018 Elsevier Ltd Novel electrochemical sensor based on poly(p-coumaric acid) electrodeposited on the surface of multi-walled carbon nanotubes modified glassy carbon electrode (poly(p-coumaric acid)/MWNT/GCE) has been developed for the direct determination of L-cysteine. Poly(p-coumaric acid) has been obtained by potentiodynamic electrolysis under the optimized conditions (0.10 mM p-coumaric acid in 0.1 M NaOH using 5 cycles in the potential window of 0–1.0 V and the scan rate of 25 mV s−1) providing highest voltammetric response of L-cysteine. Sensor surface has been studied by scanning electron microscopy (SEM), cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The porous structure of polymeric film provides 6.9-fold increase in effective surface area and 4.2-fold lower charge transfer resistance in comparison to GCE. Under conditions of DPV, the sensor response is linear in the ranges of 7.5–50 and 50–1000 μM of L-cysteine with the detection and quantification limits of 1.1 and 3.6 μM, respectively. The excellent sensor selectivity to L-cysteine in the presence of glucose, uric and ascorbic acids, dopamine, L-tyrosine and S-containing substances (homocysteine, glutathione, L-methionine, L-cystine and α-lipoic acid) has been observed. Applicability of the sensor to real samples analysis has been shown on example of human urine.
dc.relation.ispartofseries Electrochimica Acta
dc.subject Electrochemical sensors
dc.subject Electropolymerization
dc.subject L-cysteine
dc.subject p-Coumaric acid
dc.subject Voltammetry
dc.title Selective electrochemical sensor based on the electropolymerized p-coumaric acid for the direct determination of L-cysteine
dc.type Article
dc.relation.ispartofseries-volume 270
dc.collection Публикации сотрудников КФУ
dc.relation.startpage 369
dc.source.id SCOPUS00134686-2018-270-SID85044144988

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  • Публикации сотрудников КФУ Scopus [24551]
    Коллекция содержит публикации сотрудников Казанского федерального (до 2010 года Казанского государственного) университета, проиндексированные в БД Scopus, начиная с 1970г.

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