title: Xanthine microsensor based on polypyrrole molecularly imprinted film modified carbon fiber microelectrodes.
abstract: A molecularly imprinted polymers (MIPs) microsensor was presented as a carbon fiber microelectrode (CFME) coating for specifically recognizing xanthine (Xan). The polymeric film was obtained based on the imprinted procedure of electropolymerization of pyrrole in the presence of the template molecule Xan by cyclic voltammetry, and template was removed by magnetic stirring. Under the optimum conditions, a satisfactory molecularly binding selectivity of Xan was obtained from the MIPs microsensor with an imprinting factor (IF) of 6.63 and a linear response to concentration in certain ranges. The ranges are from 4.0 × 10⁻⁶ to 6.0 × 10⁻⁵ M and from 8.0 × 10⁻⁵ to 2.0 × 10⁻³ M with a detection limit of 2.5 × 10⁻⁷ M. Meanwhile, good stability (relative standard deviation [RSD] = 3.2%, n = 10) and reproducibility (RSD = 2.0%, n = 10) were observed, and recoveries ranging from 96.9 to 102.5% were calculated when applied to Xan determination in real blood serum samples.
authors.affiliation: College of Material Science and Engineering, Huaqiao University, Xiamen 361021, People's Republic of China. bliu@hqu.edu.cn
authors.forename: Bin
authors.initials: B
authors.lastname: Liu
authors.forename: Xiao-Li
authors.initials: XL
authors.lastname: Wang
authors.forename: Hui-Ting
authors.initials: HT
authors.lastname: Lian
authors.forename: Xiang-Ying
authors.initials: XY
authors.lastname: Sun
mesh_terms: D002244:Carbon / Q000737:chemistry*; D000077482:Carbon Fiber; D002623:Chemistry Techniques, Analytical / Q000295:instrumentation*; D058266:Dielectric Spectroscopy; D004563:Electrochemistry; D008839:Microelectrodes; D054802:Molecular Imprinting; D011108:Polymers / Q000138:chemical synthesis*; D011758:Pyrroles / Q000138:chemical synthesis*; D019820:Xanthine / Q000032:analysis*
chemical_list: D000077482:Carbon Fiber; D011108:Polymers; D011758:Pyrroles; D019820:Xanthine; C067635:polypyrrole; D002244:Carbon
keywords: Carbon fiber microelectrode; Molecularly imprinted polymers; Polypyrrole; Xanthine