title: Graphene modified glassy carbon sensor for the determination of aspirin metabolites in human biological samples.
abstract: A graphene modified glassy carbon (GR/GCE) sensor has been developed for the determination of aspirin metabolites 2,3- and 2,5-dihydroxybenzoic acids (2,3- and 2,5-DHB). The modified sensor was characterized by Field Emission Scanning Electron Microscopy and Electrochemical Impedance Spectroscopy. The electrochemical behavior of 2,3- and 2,5-DHB was investigated by cyclic and square wave voltammetry. The modified sensor exhibited excellent electrocatalytic activity for the oxidation of 2,3- and 2,5-DHB, leading to a remarkable enhancement in the peak current as compared to the bare sensor. The results were attributed to the enhanced surface area and high conductivity of GR. The anodic peak currents of 2,3- and 2,5-DHB were found to be linear in the concentration range of 1-150 µM and 1-200 µM with the detection limits of 47 nM and 51 nM, respectively. The sensor was capable to determine 2,5-DHB effectively without any interference from the uric acid and other metabolites present in the urine samples. The practical utility of GR/GCE has been successfully demonstrated for the determination of 2,5-DHB in the urine samples of persons undergoing treatment with aspirin.
authors.affiliation: Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee 247667, India.
authors.forename: Meruva
authors.initials: M
authors.lastname: Purushotham
authors.affiliation: Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee 247667, India.
authors.forename: Pankaj
authors.initials: P
authors.lastname: Gupta
authors.affiliation: Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee 247667, India. Electronic address: rngcyfcy@iitr.ac.in.
authors.forename: Rajendra N
authors.initials: RN
authors.lastname: Goyal
mesh_terms: D000328:Adult; D001241:Aspirin / Q000493:pharmacokinetics*; D002244:Carbon / Q000737:chemistry; D058266:Dielectric Spectroscopy; D004566:Electrodes; D005260:Female; D005841:Gentisates / Q000032:analysis / Q000737:chemistry / Q000652:urine*; D006801:Humans; D062385:Hydroxybenzoates / Q000032:analysis / Q000737:chemistry; D057230:Limit of Detection; D008297:Male; D008855:Microscopy, Electron, Scanning; D055815:Young Adult
chemical_list: D005841:Gentisates; D062385:Hydroxybenzoates; C009135:2,3-dihydroxybenzoic acid; D002244:Carbon; D001241:Aspirin; C010925:2,5-dihydroxybenzoic acid
keywords: 2,3-Dihydroxybenzoic acid; 2,5-Dihydroxybenzoic acid; Graphene; Urine; Voltammetry