Synergistic electrocatalytic effect of graphene/nickel hydroxide composite for the simultaneous electrochemical determination of ascorbic acid, dopamine and uric acid

Recent advances in electrochemical biosensing schemes using graphene and graphene-based nanocomposites

“…This important neurotransmitter plays an important role in the central nervous, hormonal, renal, and cardiovascular systems. Surprisingly, a simple screen printed electrode using graphene ink exhibits excellent LOD (0.12 lM) and linearity (0.5-2000 lM) [257] compared to those of the Ni/solar graphene/GCE (0.12 lM and 0.44-3.3 lM) [261]. A noticeably lower LOD (0.03 lM) is obtained by the graphene-Pt/GCE but linearity only ranges from 0.03 to 8.13 lM [264], comparable to that of the cobalt tetraphenylporphyrin-chemically reduced graphene/GCE (0.03 lM, 0.1-12 lM) [265].…”

Controlled functionalization of flexible graphene fibers for the simultaneous determination of ascorbic acid, dopamine and uric acid

“…Both the CV and DPV experiments confirmed that GF/ NiCo 2 O 4 possessed good electrocatalytic activity towards the oxidation of these molecules. The highly electrocatalytic activity of GF/ NiCo 2 O 4 could be probably due to the synergistic effect between the high conductivity of GF and the catalytic activity of NiCo 2 O 4 nanowires [29]. In order to better understand the catalytic activity of NiCo 2 O 4 nanowires, Scheme 2 displayed the mechanism of the reactions between AA, DA, UA and NiCo 2 O 4 .…”

Voltammetric determination of dopamine in the presence of ascorbic acid and uric acid at sodium dodecyl sulphate/reduced graphene oxide modified carbon paste electrode

“…dopamine (DA), uric acid (UA) and ascorbic acid (AA) [16][17][18]. DA and AA are compounds of great biomedical interest, playing significant roles in the functioning of the human metabolism, central nervous and renal systems [19]. DA is an important monoamine neurotransmitter in central nervous system of mammalians [20].…”