Sulfadiazine-selective determination in aquaculture environment: Selective potentiometric transduction by neutral or charged ionophores

• Tipo: Artigo em Revista Científica Internacional
• Data: 2011

Autores

Almeida, SAA (Autor) Outra; Heitor, AM (Autor) Outra; Montenegro, MCBSM (Autor) FFUP; Sales, MGF (Autor) Outra

Revista

Título: Talanta

Vol. 85

Páginas: 1508-1516

ISSN: 0039-9140

Editora: Elsevier

Indexação

ISI Web of Knowledge - 28 Citações

Scopus - 29 Citações

Classificação Científica

FOS: Ciências exactas e naturais > Química

Outras Informações

ID Authenticus: P-002-MJZ

DOI: 10.1016/j.talanta.2011.06.022

Abstract (EN): Solid-contact sensors for the selective screening of sulfadiazine (SDZ) in aquaculture waters are reported. Sensor surfaces were made from PVC membranes doped with tetraphenylporphyrin-manganese(III) chloride, alpha-cyclodextrin, beta-cyclodextrin, or gamma-cyclodextrin ionophores that were dispersed in plasticizer. Some membranes also presented a positive or a negatively charged additive. Phorphyrin-based sensors relied on a charged carrier mechanism. They exhibited a near-Nernstian response with slopes of 52 mV decade(-1) and detection limits of 3.91 x 10(-5) mol L-1. The addition of cationic lipophilic compounds to the membrane originated Nernstian behaviours, with slopes ranging 59.7-62.0 mV decade(-1) and wider linear ranges. Cyclodextrin-based sensors acted as neutral carriers. In general, sensors with positively charged additives showed an improved potentiometric performance when compared to those without additive. Some SDZ selective membranes displayed higher slopes and extended linear concentration ranges with an increasing amount of additive (always <100% ionophore). The sensors were independent from the pH of test solutions within 2-7. The sensors displayed fast response, always <15 s. In general, a good discriminating ability was found in real sample environment. The sensors were successfully applied to the fast screening of SDZ in real waters samples from aquaculture fish farms. The method offered the advantages of simplicity, accuracy, and automation feasibility. The sensing membrane may contribute to the development of small devices allowing in locus measurements of sulfadiazine or parent-drugs.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 9