title: Poly-Alizarin red S/multiwalled carbon nanotube modified glassy carbon electrode for the boost up of electrocatalytic activity towards the investigation of dopamine and simultaneous resolution in the presence of 5-HT: A voltammetric study.
abstract: Poly-Alizarin red S/multiwalled carbon nanotube film on the surface of glassy carbon electrode (poly-AzrS/MWCNT/GCE) was synthesized by electrochemical process and was used for the sensitive and selective determination of dopamine (DA) by employing voltammetric techniques. The electrocatalytic response of the modified electrode was found to exhibit admirable activity. The simultaneous determination of dopamine in the presence of serotonin (5-HT) was found to exhibit very good response at poly-AzrS/MWCNTs/GCE. The effect of pH, scan rate, accumulation time and concentration of dopamine was studied at the developed poly-AzrS/MWCNTs/GCE. The poly-AzrS/MWCNTs/GCE exhibited an efficient electron mediating behavior together with well resolved peaks for dopamine, in 0.1 mol/dm(3) phosphate buffer (PBS) solution of pH 7.0. The limit of detection (LOD) and limit of quantification (LOQ) were found to be as 1.89 × 10(-7) mol/dm(3) and 6.312 × 10(-7) mol/dm(3) respectively with a dynamic range from 1 × 10(-6) to 1.8 × 10(-5) mol/dm(3). The interfacial electron transfer behavior of DA was studied by electrochemical impedance spectroscopy (EIS); the studies showed that the charge transfer rate was enhanced at poly-AzrS/MWCNTs/GCE when compared with bare GCE and poly-AzrS/GCE.
authors.affiliation: Electrochemical Research Laboratory, Department of Chemistry, S.V.U. College of Sciences, Sri Venkateswara University, Tirupati 517 502, Andhra Pradesh, India.
authors.forename: K
authors.initials: K
authors.lastname: Reddaiah
authors.affiliation: Electrochemical Research Laboratory, Department of Chemistry, S.V.U. College of Sciences, Sri Venkateswara University, Tirupati 517 502, Andhra Pradesh, India; Department of Chemistry, University of Minnesota, 207 Pleasant Street SE, Minneapolis, MN 55455, USA. Electronic address: tmsreddysvu@gmail.com.
authors.forename: T
authors.initials: T
authors.lastname: Madhusudana Reddy
authors.affiliation: Department of Safety Engineering, Dongguk University, 123 Dongdae-ro, Gyeongju, Gyeongbuk 780 714, Republic of Korea.
authors.forename: D K
authors.initials: DK
authors.lastname: Venkata Ramana
authors.affiliation: DST-PURSE Centre, Sri Venkateswara University, Tirupati 517502, Andhra Pradesh, India.
authors.forename: Y
authors.initials: Y
authors.lastname: Subba Rao
mesh_terms: D000880:Anthraquinones / Q000737:chemistry*; D002244:Carbon / Q000737:chemistry; D058266:Dielectric Spectroscopy; D004298:Dopamine / Q000032:analysis*; D055664:Electrochemical Techniques; D004566:Electrodes; D006863:Hydrogen-Ion Concentration; D057230:Limit of Detection; D018625:Microscopy, Atomic Force; D037742:Nanotubes, Carbon / Q000737:chemistry*; D010084:Oxidation-Reduction; D012701:Serotonin / Q000737:chemistry*
chemical_list: D000880:Anthraquinones; D037742:Nanotubes, Carbon; D012701:Serotonin; C004468:Alizarin Red S; D002244:Carbon; D004298:Dopamine
keywords: Alizarin red S; Dopamine; Electrochemical impedance spectroscopy; Glassy carbon electrode; Multiwalled carbon nanotubes; Serotonin