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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 |