title: Glutathione modified screen-printed carbon nanofiber electrode for the voltammetric determination of metal ions in natural samples.
abstract: This work reports the development of a glutathione modified electrode via electrografting on a screen-printed carbon nanofiber substrate (GSH-SPCNFE). GSH-SPCNFE was compared to a classical screen-printed carbon electrode modified with glutathione (GSH-SPCE) for the simultaneous voltammetric determination of Cd(II) and Pb(II). Their electrochemical characterization and analytical performance suggest that SPCNFE could be a much better support for GSH immobilization. The applicability of GSH-SPCNFE for the determination of low concentration levels of Pb(II) and Cd(II) ions in environmental samples was successfully tested in a certified wastewater reference material by means of stripping voltammetry with a very high reproducibility and good trueness.
authors.affiliation: Departament de Química Analítica, Facultat de Química, Universitat de Barcelona, Martí i Franquès 1-11, E-08028 Barcelona, Spain.
authors.forename: Clara
authors.initials: C
authors.lastname: Pérez-Ràfols
authors.affiliation: Departament de Química Analítica, Facultat de Química, Universitat de Barcelona, Martí i Franquès 1-11, E-08028 Barcelona, Spain. Electronic address: nuria.serrano@ub.edu.
authors.forename: Núria
authors.initials: N
authors.lastname: Serrano
authors.affiliation: Departament de Química Analítica, Facultat de Química, Universitat de Barcelona, Martí i Franquès 1-11, E-08028 Barcelona, Spain.
authors.forename: José Manuel
authors.initials: JM
authors.lastname: Díaz-Cruz
authors.affiliation: Departament de Química Analítica, Facultat de Química, Universitat de Barcelona, Martí i Franquès 1-11, E-08028 Barcelona, Spain.
authors.forename: Cristina
authors.initials: C
authors.lastname: Ariño
authors.affiliation: Departament de Química Analítica, Facultat de Química, Universitat de Barcelona, Martí i Franquès 1-11, E-08028 Barcelona, Spain.
authors.forename: Miquel
authors.initials: M
authors.lastname: Esteban
mesh_terms: D002104:Cadmium / Q000032:analysis* / Q000737:chemistry; D002138:Calibration; D002244:Carbon / Q000737:chemistry*; D004563:Electrochemistry; D004566:Electrodes; D005978:Glutathione / Q000737:chemistry*; D007854:Lead / Q000032:analysis* / Q000737:chemistry; D057139:Nanofibers / Q000737:chemistry*; D011327:Printing; D013997:Time Factors; D062065:Wastewater / Q000737:chemistry*
chemical_list: D002104:Cadmium; D002244:Carbon; D005978:Glutathione; D007854:Lead; D062065:Wastewater
keywords: Electrochemical grafting; Glutathione; Metal determination; Peptide-modified sensors; Screen-printed electrodes; Stripping voltammetry