Otro
A novel potentiometric naproxenate ion sensor immobilized in a graphite matrix for determination of naproxen in pharmaceuticals
Registro en:
Journal of the Brazilian Chemical Society, v. 17, n. 4, p. 785-791, 2006.
0103-5053
10.1590/S0103-50532006000400022
S0103-50532006000400022
WOS:000239616800021
2-s2.0-33746754680.pdf
2-s2.0-33746754680
0000-0003-0197-7369
Autor
Santini, Alberto O.
Oliveira, Jose Eduardo de
Pezza, Helena Redigolo
Pezza, Leonardo
Resumen
The characteristics, performance, and application of an electrode, namely, Pt|Hg|Hg 2(NAP) 2| Graphite, where NAP stands for naproxenate ion, are described. This electrode responds to NAP with sensivity of (58.1± 0.9) mV decade -1 over the range 5.0 × 10 -5 - 1.0 × 10 -2 mol L -1 at pH 6.0-9.0 and a detection limit of 3.9 × 10 -5 mol L -1. The electrode is easily constructed at a relatively low cost with fast response time (within 10-35 s) and can be used for a period of 6 months without any considerable divergence in potentials. The proposed sensor displayed good selectivity for naproxen in the presence of several substances, especially concerning carboxylate and inorganic anions. It was used for the direct assay of naproxen in commercial tablets by means of the standard additions method. The analytical results obtained by using this electrode are in good agreement with those given by the United States Pharmacopeia procedure. ©2006 Sociedade Brasileira de Química.