Simultaneous electrochemical determination of dopamine and paracetamol on multiwalled carbon nanotubes/graphene oxide nanocomposite-modified glassy carbon electrode

Synthesis of short graphene oxide nanoribbons for improved biomarker detection of Parkinson's disease

“…The applications of graphene for the detection of glucose, cytochrome c (Cyt-c), nicotinamide adenine dinucleotide (NADH), hemoglobin (Hb), cholesterol, ascorbic acid (AA), uric acid (UA), dopamine (DA), and hydrogen peroxide (H 2 O 2 ) have been discussed (Kuila et al, 2011). Among all analytes, UA and DA are reported to be the biomarkers of Parkinson's disease (Cheemalapati et al, 2013;Cheng Xiang Lim et al, 2010;Ezhil Vilian et al, 2014;Hong Yan Yue et al, 2014;Ming Zhou and Dong, 2009;Palanisamy et al, 2013;Rajkumar et al, 2014;Shang et al, 2008;Sheng et al, 2012;Sun et al, 2011aSun et al, , 2011b.…”

An ultrasensitive performance enhanced novel cytochrome c biosensor for the detection of rebaudioside A

“…To this solution 5 mL of the previously prepared AuNPs solution was added and then ultrasonicated for 1 h to obtain AuNPs-GO material. For the preparation of AuNPs-GO/MWCNTs nanocomposite, MWCNTs were added to the 5 mL of AuNPs-GO solution and then sonicated for 45 min to produce a homogenous dispersion of AuNPs-GO/ MWCNTs (Cheemalapati et al, 2013). Finally, the resulting AuNPs-GO/MWCNTs dispersion was centrifuged at 3000 rpm to separate the loosely bound MWCNTs and washed several times with deionized water.…”

“…Specifically, graphene oxide (GO), a derivative of graphene is widely used, due to the presence of a larger number of -OH, -COOH and -C-O-C-functional groups on the basal plane (Gao et al, 2013). Recently, GO was used for the fabrication of biosensors in the analysis of D-and L-tryptophan (Zor et al, 2013), dopamine and paracetamol (Cheemalapati et al, 2013), uric acid, xanthine, hypoxanthine and caffeine (Amal Raj and Abraham John, 2013), dopamine and ascorbic acid (Gao et al, 2013). Similarly, gold nanoparticles (AuNPs) have attracted much attention in the development of electrochemical biosensors.…”

“…On comparing the pure GO and MWCNTs the combined GO/MWCNTs nanocomposite provided a higher edge density than GO and at a higher surface area than MWCNTs (Cheemalapati et al, 2013), thus enhancing the thermal stability of Cyt c activity over a wider range of pH's (Patila et al, 2013). Cyt c was adsorbed tightly on the surface of the modified electrode, showing enzyme-like activity for the reduction of Reb A.…”

Synthesis of reduced graphene oxide intercalated ZnO quantum dots nanoballs for selective biosensing detection

“…Meanwhile, the decrease of Van der Waals' force and the π-π stacking interaction between the lateral dimensions of the nanosheets and MWCNTs also help for stability. [25] When the Ni foam/MWCNTs/GO mixture was added into DMF containing Zn(CH 3 COO) 2 ·2H 2 O, ZnO QDs embryos were preferentially formed. Then, as the Zn 2+ cations were further chemisorbed on the embryos, they would favorably bind with oxygen-containing groups on GO sheets via electrostatic interactions, leading to the local creation of Zn-O-C bonding (Fig.…”