Construction and evaluation of PVC conventional and tubular tripelennamine-selective electrodes: Their application in pharmaceutical preparations

• Tipo: Artigo em Revista Científica Internacional
• Data: 1996

Autores

Lima, JLFC (Autor) FFUP; Montenegro, MCBSM (Autor) FFUP; Sales, MGF (Autor) Outra

Revista

Título: Journal of Pharmaceutical and Biomedical Analysis

Vol. 14

Páginas: 931-938

ISSN: 0731-7085

Editora: Elsevier

Indexação

ISI Web of Knowledge - 16 Citações

Scopus - 19 Citações

Classificação Científica

FOS: Ciências exactas e naturais > Química

Outras Informações

ID Authenticus: P-001-E7G

DOI: 10.1016/0731-7085(95)01710-0

Abstract (EN): The construction and evaluation of tripelennamine conventionally-shaped ion-selective electrodes and tubular detectors for the determination of this compound in pharmaceutical formulations are described. Electrodes with conventional configuration have been constructed without an internal reference solution, using several types of immobilized ionic sensors in PVC. The different electrode membranes were prepared by using tripelennamine tetraphenylborate as ionic-exchanger, dissolved in 2-nitrophenyl octyl ether (type A), dibutylphthalate (type B) and bis-(2-ethylhexyl)sebacate (type C) as plasticizer solvents. The general working characteristics of the different types of conventional electrodes were evaluated in tripelennamine solutions, with adjusted ionic strength, showing a linear response in the concentration range of about 4 x 10(-5)-1 x 10(-1) M and a slope near the theoretical value. The electrodes presented a fast response (>20 s) and a high reproducibility (+/-0.2 mV per day). The electrode selectivity in the presence of some interferents, such as sodium, potassium, lithium, ammonium, chlorpheniramine, diphenydramine, promethazine, meclizine and pentazocine, was good, particularly for those whose sensor membrane was prepared with tripelennamine tetraphenylborate dissolved in 2-nitrophenyl octyl ether (type A). Tubular detectors were also prepared using the same sensor membrane and were evaluated in a low-dispersion flow-injection manifold. Under these conditions the detectors presented response characteristics similar to those of the corresponding conventionally-shaped electrodes. The analysis of different pharmaceutical forms (creams, syrups and gels) gave good results with mean recoveries of 99.8-100.6% when the experiments were conducted by direct potentiometry and 99.9-100.4% where the same determinations were conducted by flow-injection analysis with tubular detectors.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 8