Electrodeposition of PANi films on platinum needle type microelectrodes. Application to the oxidation of ascorbate in human plasma
Electrodeposition of PANi films on platinum needle type microelectrodes. Application to the oxidation of ascorbate in human plasma
Needle type (165 ?m2) and small Pt disc (3–11 ?m2) microelectrodes were used for the electrodeposition of composite poly(aniline), PANi, films by cyclic voltammetry and chronoamperometry for the oxidation of ascorbate. PANi electroactivity at neutral pH was retained through polymer alkylation or by using large poly-anions, such as poly(vinylsulfonate), PVS, and poly(styrenesulfonate), PSS. Hence the growth of the composite films was studied in the presence of different counter ions such as SO42?, Cl?, NaPVS and NaPSS. The morphology of the resulting films was examined by scanning electron microscopy. Results showed that flat PANi films with thicknesses much lower than the microelectrode radius were obtained by potentiodynamic electrodeposition. On the other hand films with mushroom shapes, with significant spill over, were obtained under constant potential. The resulting polymer modified microelectrodes films were shown to be suitable for the oxidation of ascorbate at 0.1 V vs. SCE and pH 7 with a detection limit of 1 ?M for PANi/PSS composites. The current was independent of film thickness, mass transport controlled at low ascorbate concentrations and not affected by the presence of common interferences such as uric acid, glutathione or vitamin E. Due to their excellent properties the PANi–PSS film coated microelectrodes were used for the amperometric detection of ascorbate in human plasma. The results are encouraging for the use of small polymer modified Pt needle type microelectrodes for the detection of ascorbate in biological systems
1-8
Bonastre, A.M.
9731c624-c993-4b25-a69a-fa03cf2abaca
Bartlett, P.N.
d99446db-a59d-4f89-96eb-f64b5d8bb075
August 2010
Bonastre, A.M.
9731c624-c993-4b25-a69a-fa03cf2abaca
Bartlett, P.N.
d99446db-a59d-4f89-96eb-f64b5d8bb075
Bonastre, A.M. and Bartlett, P.N.
(2010)
Electrodeposition of PANi films on platinum needle type microelectrodes. Application to the oxidation of ascorbate in human plasma.
Analytica Chimica Acta, 676 (1-2), .
(doi:10.1016/j.aca.2010.07.003).
(PMID:20800735)
Abstract
Needle type (165 ?m2) and small Pt disc (3–11 ?m2) microelectrodes were used for the electrodeposition of composite poly(aniline), PANi, films by cyclic voltammetry and chronoamperometry for the oxidation of ascorbate. PANi electroactivity at neutral pH was retained through polymer alkylation or by using large poly-anions, such as poly(vinylsulfonate), PVS, and poly(styrenesulfonate), PSS. Hence the growth of the composite films was studied in the presence of different counter ions such as SO42?, Cl?, NaPVS and NaPSS. The morphology of the resulting films was examined by scanning electron microscopy. Results showed that flat PANi films with thicknesses much lower than the microelectrode radius were obtained by potentiodynamic electrodeposition. On the other hand films with mushroom shapes, with significant spill over, were obtained under constant potential. The resulting polymer modified microelectrodes films were shown to be suitable for the oxidation of ascorbate at 0.1 V vs. SCE and pH 7 with a detection limit of 1 ?M for PANi/PSS composites. The current was independent of film thickness, mass transport controlled at low ascorbate concentrations and not affected by the presence of common interferences such as uric acid, glutathione or vitamin E. Due to their excellent properties the PANi–PSS film coated microelectrodes were used for the amperometric detection of ascorbate in human plasma. The results are encouraging for the use of small polymer modified Pt needle type microelectrodes for the detection of ascorbate in biological systems
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Published date: August 2010
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Local EPrints ID: 177973
URI: http://eprints.soton.ac.uk/id/eprint/177973
ISSN: 0003-2670
PURE UUID: 3f3ba25b-8be4-48f2-92b3-89cbdd8eefd8
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Date deposited: 22 Mar 2011 11:34
Last modified: 15 Mar 2024 02:44
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A.M. Bonastre
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