Electrochemical sensors for dopamine using graphene-cobalt(II) complex modified glassy carbon electrode by adsorptive voltammetry

Carol Cuadrado; Laura Ibarra; John Hurtado; Olimpo García-Beltrán; Edgar Nagles

Electrochemical sensors for dopamine using graphene-cobalt(II) complex modified glassy carbon electrode by adsorptive voltammetry

Carol Cuadrado, Laura Ibarra, John Hurtado, Olimpo García-Beltrán, Edgar Nagles

Research output: Contribution to journal › Article › peer-review

Abstract

[Co(bdmpzm)₂(NCS)₂] (bdmpzm=bis(3,5-dimethylpyrazol-1-yl)methane) was dispersed in graphene oxide (GOx). Composite GOx-[Co(bdmpzm)₂(NCS)₂] was deposited on a glassy carbon electrode (GCE) and reduced at -1.0 by 60 s. The modified electrode rGOx-[Co(bdmpzm)₂(NCS)₂]/GCE allowed the oxidation for dopamine (DA) at 0.41 V Our results showed reversible and sensitive process, (ΔV 0.09 V) compared with the electrode without modified in buffer phosphate solution pH 3.0. The detection limit (3σ/b) for dopamine was 0.11 μmol L^-1 and the RSD was 3.0%. The presence of uric acid and ascorbic acid did not interfere with the signal for dopamine.

Original language	English
Pages (from-to)	910-921
Number of pages	12
Journal	Analytical and Bioanalytical Electrochemistry
Volume	8
Issue number	7
State	Published - 15 Nov 2016

Bibliographical note

Funding Information:
E. N and O. G thank to the financial support by the Universidad de Ibagué (15-376-INT- 16-416-INT) is gratefully acknowledged. J.H thank the Department of Chemistry and the School of Science of the Universidad de los Andes for the financial support.

Publisher Copyright:
© 2016 by CEE (Center of Excellence in Electrochemistry).

Keywords

Adsorptive voltammetry
Cobalt(II) complex
Dopamine
Graphene oxide
Human urine
Uric acid

Cite this

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title = "Electrochemical sensors for dopamine using graphene-cobalt(II) complex modified glassy carbon electrode by adsorptive voltammetry",

abstract = "[Co(bdmpzm)2(NCS)2] (bdmpzm=bis(3,5-dimethylpyrazol-1-yl)methane) was dispersed in graphene oxide (GOx). Composite GOx-[Co(bdmpzm)2(NCS)2] was deposited on a glassy carbon electrode (GCE) and reduced at -1.0 by 60 s. The modified electrode rGOx-[Co(bdmpzm)2(NCS)2]/GCE allowed the oxidation for dopamine (DA) at 0.41 V Our results showed reversible and sensitive process, (ΔV 0.09 V) compared with the electrode without modified in buffer phosphate solution pH 3.0. The detection limit (3σ/b) for dopamine was 0.11 μmol L-1 and the RSD was 3.0%. The presence of uric acid and ascorbic acid did not interfere with the signal for dopamine.",

keywords = "Adsorptive voltammetry, Cobalt(II) complex, Dopamine, Graphene oxide, Human urine, Uric acid",

author = "Carol Cuadrado and Laura Ibarra and John Hurtado and Olimpo Garc{\'i}a-Beltr{\'a}n and Edgar Nagles",

note = "Publisher Copyright: {\textcopyright} 2016 by CEE (Center of Excellence in Electrochemistry).",

year = "2016",

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T1 - Electrochemical sensors for dopamine using graphene-cobalt(II) complex modified glassy carbon electrode by adsorptive voltammetry

AU - Cuadrado, Carol

AU - Ibarra, Laura

AU - Hurtado, John

AU - García-Beltrán, Olimpo

AU - Nagles, Edgar

PY - 2016/11/15

Y1 - 2016/11/15

N2 - [Co(bdmpzm)2(NCS)2] (bdmpzm=bis(3,5-dimethylpyrazol-1-yl)methane) was dispersed in graphene oxide (GOx). Composite GOx-[Co(bdmpzm)2(NCS)2] was deposited on a glassy carbon electrode (GCE) and reduced at -1.0 by 60 s. The modified electrode rGOx-[Co(bdmpzm)2(NCS)2]/GCE allowed the oxidation for dopamine (DA) at 0.41 V Our results showed reversible and sensitive process, (ΔV 0.09 V) compared with the electrode without modified in buffer phosphate solution pH 3.0. The detection limit (3σ/b) for dopamine was 0.11 μmol L-1 and the RSD was 3.0%. The presence of uric acid and ascorbic acid did not interfere with the signal for dopamine.

AB - [Co(bdmpzm)2(NCS)2] (bdmpzm=bis(3,5-dimethylpyrazol-1-yl)methane) was dispersed in graphene oxide (GOx). Composite GOx-[Co(bdmpzm)2(NCS)2] was deposited on a glassy carbon electrode (GCE) and reduced at -1.0 by 60 s. The modified electrode rGOx-[Co(bdmpzm)2(NCS)2]/GCE allowed the oxidation for dopamine (DA) at 0.41 V Our results showed reversible and sensitive process, (ΔV 0.09 V) compared with the electrode without modified in buffer phosphate solution pH 3.0. The detection limit (3σ/b) for dopamine was 0.11 μmol L-1 and the RSD was 3.0%. The presence of uric acid and ascorbic acid did not interfere with the signal for dopamine.

KW - Adsorptive voltammetry

KW - Cobalt(II) complex

KW - Dopamine

KW - Graphene oxide

KW - Human urine

KW - Uric acid

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M3 - Artículo

AN - SCOPUS:84995701351

SN - 2008-4226

VL - 8

SP - 910

EP - 921

JO - Analytical and Bioanalytical Electrochemistry

JF - Analytical and Bioanalytical Electrochemistry

IS - 7

ER -

Electrochemical sensors for dopamine using graphene-cobalt(II) complex modified glassy carbon electrode by adsorptive voltammetry

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