Title of article :
Electrochemical Sensors for Dopamine using Graphene-cobalt(II) Complex Modified Glassy Carbon Electrode by Adsorptive Voltammetry
Author/Authors :
Cuadrado, Carol Facultad de Ciencias Naturales y Matemáticas - Universidad de Ibagué , Ibarra, Laura Departamento de Química - Universidad de los Andes , Hurtado, John Departamento de Química - Universidad de los Andes , García-Beltránm, Olimpo Facultad de Ciencias Naturales y Matemáticas - Universidad de Ibagué , Nagles, Edgar Facultad de Ciencias Naturales y Matemáticas - Universidad de Ibagué
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 :
Dopamine , Uric acid , Human urine , Cobalt(II) complex , Adsorptive voltammetry , Graphene oxide
Journal title :
Astroparticle Physics
