title: Electroactive species-doped poly(3,4-ethylenedioxythiophene) films: enhanced sensitivity for electrochemical simultaneous determination of vitamins B2, B6 and C.
abstract: Herein, functionalized PEDOT films were prepared by incorporation of two electroactive species, ferrocenecarboxylic acid (Fc(-)) and ferricyanide (Fe(CN)6(4-)) as doping anions during the electropolymerization of PEDOT at glassy carbon electrodes (GCEs) from aqueous solution. The electrochemically synthesized electroactive species-doped PEDOT films have been carefully characterized by scanning electron microscopy (SEM), FTIR and UV/Vis spectra and various electrochemical techniques. Such nanostructured films combined the advantages of PEDOT (high conductivity and stability) together with electroactive species (good electrochemical activity) and were applied as electrochemical sensors for simultaneous determination of vitamin B2 (VB2), vitamin B6 (VB6) and vitamin C (VC). The results showed that the oxidation peak currents of vitamins obtained at the GCEs modified with electroactive species-doped PEDOT films were much higher than those at the ClO4(-)-doped PEDOT films and bare GCEs. The experiment results also illustrated that the sensors possessed high selectivity with no interference from other potential competing species. Moreover, the proposed sensors were successfully employed for the determination of vitamins in orange juice samples with satisfactory results.
authors.affiliation: Jiangxi Key Laboratory of Organic Chemistry, Jiangxi Science and Technology Normal University, Nanchang 330013, PR China; College of Science, Jiangxi Agricultural University, Nanchang 330045, PR China.
authors.forename: Tao
authors.initials: T
authors.lastname: Nie
authors.forename: Jing-Kun
authors.initials: JK
authors.lastname: Xu
authors.forename: Li-Min
authors.initials: LM
authors.lastname: Lu
authors.forename: Kai-Xin
authors.initials: KX
authors.lastname: Zhang
authors.forename: Ling
authors.initials: L
authors.lastname: Bai
authors.forename: Yang-Ping
authors.initials: YP
authors.lastname: Wen
mesh_terms: D001205:Ascorbic Acid / Q000032:analysis*; D001628:Beverages / Q000032:analysis*; D019086:Bridged Bicyclo Compounds, Heterocyclic / Q000737:chemistry*; D032084:Citrus sinensis / Q000737:chemistry; D055664:Electrochemical Techniques / Q000295:instrumentation*; D004566:Electrodes; D005292:Ferricyanides / Q000737:chemistry; D005296:Ferrous Compounds / Q000737:chemistry; D000075163:Metallocenes; D011108:Polymers / Q000737:chemistry*; D012256:Riboflavin / Q000032:analysis*; D012680:Sensitivity and Specificity; D025101:Vitamin B 6 / Q000032:analysis*
chemical_list: D019086:Bridged Bicyclo Compounds, Heterocyclic; D005292:Ferricyanides; D005296:Ferrous Compounds; D000075163:Metallocenes; D011108:Polymers; C121383:poly(3,4-ethylene dioxythiophene); C032949:ferrocenecarboxylic acid; C007931:hexacyanoferrate III; D025101:Vitamin B 6; D001205:Ascorbic Acid; D012256:Riboflavin
keywords: Ferrocenecarboxylic acid; Ferrocyanide; Poly(3,4-ethylenedioxythiophene); Simultaneous determination; Vitamin B