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Ion Selective Electrode for Dopamine Based on a Molecularly Imprinted Polymer
Author(s) -
Pesavento M.,
D'Agostino G.,
Biesuz R.,
Alberti G.,
Profumo A.
Publication year - 2012
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.201100509
Subject(s) - molecularly imprinted polymer , methacrylic acid , polymerization , electrode , ion selective electrode , polymer , carbon paste electrode , materials science , ionophore , chemistry , membrane , inorganic chemistry , chemical engineering , electrochemistry , organic chemistry , cyclic voltammetry , selectivity , catalysis , biochemistry , engineering
An all‐solid‐state ISE for dopamine (DAHCl) has been developed based on a screen printed graphite electrode modified with a multiwalled carbon nanotubes layer as an ion to electron transducer. The selective membrane is an acrylic polymer molecularly imprinted with the ion of interest (MIP). The polymer is made up of methacrylic acid as functional monomer and ethyleneglycole dimethacrylate as cross linker. The polymerization at 75 °C in the presence of AIBN as initiator was carried out in situ, directly over the CNT‐modified screen printed graphite. The specific site obtained after polymerization and template elution can be considered as the ionophore, and the carboxylic groups as the cation exchanger groups, similarly to the usual ISE membrane. The specificity of the electrode was evaluated by voltammetric methods, and was very good. The potential of the electrode, measured against a double junction Ag/AgCl/KCl (sat.), linearly increases with the dopamine concentration at concentration higher than 10 −4 M, but only in salt solution at least 0.1 M. The sensibility was less than nernstian. Not any potential increase was found for the electrode modified with not imprinted polymer (NIP) at the same conditions. The effect of ions in solution was particularly considered.