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Reference type: Journal
Authors: Rebelo TSCR, Almeida SAA, Guerreiro JRL, Montenegro MCBSM, Sales MGF
Article Title: Trimethoprim-selective electrodes with molecularly imprinted polymers acting as ionophores and potentiometric transduction on graphite solid-contact.
Publication date: 2011
Journal: Microchemical Journal
Volume: 98
Issue: (1)
Page numbers: 21-28.
DOI: 10.1016/j.microc.2010.10.006
Alternative URL: http://www.sciencedirect.com/science/article/B6W6H-51BNX0Y-2/2/c617cb8dc86f00aa0b538b5dd229c700

Abstract: This work proposes a new biomimetic sensor material for trimethoprim. It is prepared by means of radical polymerization, having trimethylolpropane trimethacrylate as cross-linker, benzoyl peroxide as radicalar iniciator, chloroform as porogenic solvent, and methacrylic acid and 2-vinyl pyridine as monomers. Different percentages of sensor in a range between 1 and 6% were studied. Their behavior was compared to that obtained with ion-exchanger quaternary ammonium salt (additive tetrakis(p-chlorophenyl)borate or tetraphenylborate). The effect of an anionic additive in the sensing membrane was also tested. Trimethoprim sensors with 1% of imprinted particles from methacrylic acid monomers showed the best response in terms of slope (59.7 mV/decade) and detection limit (4.01 x 10-7 mol/L). These electrodes displayed also a good selectivity towards nickel, manganese aluminium, ammonium, lead, potassium, sodium, iron, chromium, sulfadiazine, alanine, cysteine, tryptophan, valine and glycine. The sensors were not affected by pH changes from 2 to 6. They were successfully applied to the analysis of water from aquaculture
Template and target information: trimethoprim
Author keywords: trimethoprim, Potentiometry, Ion selective sensors, Molecularly imprinted polymers, Aquaculture water

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