期刊
ELECTROANALYSIS
卷 23, 期 11, 页码 2582-2585出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/elan.201100195
关键词
Antituberculosis drugs; Carbon-based composite electrode; Ethambutol; FIA
资金
- FAPEMIG (Fundacao de Amparo a Pesquisa do Estado de Minas Gerais)
- CNPq (Conselho Nacional de Desenvolvimento Cientifico e Tecnologico)
- CAPES (Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior)
- Propesq-UFJF (Pro-reitoria de Pesquisa da Universidade Federal de Juiz de Fora)
A graphite-paraffin composite electrode has been used for the determination of ethambutol, an antituberculosis drug, in pharmaceutical samples by anodic oxidation. Voltammetric studies were used to characterise the electro-chemical behaviour of the ethambutol in different pH solutions (3.0, 8.0 and 12.0). Quantification was carried out using amperometric detection. The detector was assembled in a flow injection apparatus and operated at + 1.1 V (vs. Ag/ AgCl(NaCl, sat)). The conditions for the best electrode's response were determined by studying the influence of sample volume and flow rate. The linear response for the method was extended up to a 1.5 mmolL(-1) ethambutol solution with a detection limit of 0.1 mmolL(-1). The repeatability for successive injections of 1.0 mmolL(-1) ethambutol solution was 0.9% (n = 26), demonstrating a good performance of the developed amperometric sensor. The analytical frequency was calculated as approximately 47 determinations h(-1). Two different commercial samples were successfully analysed and the results were in good agreement with those obtained by using spectrophotometry. The advantages of the proposed amperometric method over the reference method include simplicity, low consumption of reagents and increased analytical frequency.
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