Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.22/3047
Título: Trimethoprim-selective electrodes with molecularly imprinted polymers acting as ionophores and potentiometric transduction on graphite solid-contact
Autor: Rebelo, Tânia S. C. R.
Almeida, Sofia A. A.
Guerreiro, J. Rafaela L.
Montenegro, M. Conceição B. S. M.
Sales, M. Goreti F.
Palavras-chave: Trimethoprim
Ion selective sensors
Molecularly imprinted polymers
Aquaculture water
Data: 2011
Editora: Elsevier
Relatório da Série N.º: Microchemical Journal; Vol. 98, Issue 1
Resumo: 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 (4.01×10−7 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.
Peer review: yes
URI: http://hdl.handle.net/10400.22/3047
ISSN: 0026-265X
Versão do Editor: http://www.sciencedirect.com/science/article/pii/S0026265X10002122
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