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Molecularly Imprinted Polymer‐Based Sensors for Amperometric Determination of Nonelectroactive Substances
Author(s) -
Pesavento Maria,
D'Agostino Girolamo,
Biesuz Raffaela,
Alberti Giancarla
Publication year - 2009
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.200804456
Subject(s) - cyanuric acid , amperometry , aqueous solution , membrane , detection limit , molecularly imprinted polymer , chemistry , polymer , electrode , graphite , glassy carbon , chromatography , analytical chemistry (journal) , chemical engineering , inorganic chemistry , electrochemistry , nuclear chemistry , melamine , organic chemistry , cyclic voltammetry , selectivity , catalysis , biochemistry , engineering
Amperometric sensors for nonelectroactive substances have been obtained by contacting glassy carbon or graphite electrodes with molecularly imprinted polymeric (MIP) membranes, 300–0.6 μm thick. The thicker membranes were self standing membranes while the thinner ones were prepared by drop coating on a graphite electrode. Cyanuric acid and atrazine were the target compounds. Determinations were carried out at −850 mV (vs. Ag/AgCl(sat)) in aqueous solution at pH 1.5, followed by a step at +500. The current linearly depends on the concentration of the template molecule in aqueous solution up to 10 −4 M. For atrazine the current increases with the concentration, while for cyanuric acid the current intensity decreases. Not any current variation was observed on bare carbon electrodes, nor on electrodes covered with a nonimprinted membrane. The detection limit was 9×10 −7 M for atrazine and 2×10 −5 M for cyanuric acid. The sensors response was very fast and selective for the corresponding template.