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Analytical Letters Volume 40, 2007 - Issue 16
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Pharmaceutical Analysis

Biamperometric Determination of Tetracycline in Pharmaceuticals

Francisco F. Gambarra Neto Departamento de Química, Universidade Federal da Paraíba, João Pessoa, PB, Brazil
,
Renato S. Lima Departamento de Química, Universidade Federal da Paraíba, João Pessoa, PB, Brazil
,
Wellington S. Lyra Departamento de Química, Universidade Federal da Paraíba, João Pessoa, PB, Brazil
,
Glimaldo Marino Departamento de Química, Universidade Federal da Paraíba, João Pessoa, PB, Brazil
,
Mario C. Ugulino Araujo Departamento de Química, Universidade Federal da Paraíba, João Pessoa, PB, BrazilCorrespondence[email protected]
,
Everaldo P. Medeiros Embrapa Algodão, Campina Grande, PB, Brazil
&
Valberes B. Nascimento Departamento de Química, Universidade Federal Rural de Pernambuco, Recife, PE, Brazil
 show all
Pages 3070-3079 | Received 19 Jul 2007, Accepted 01 Sep 2007, Published online: 04 Feb 2008
 
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Abstract

A fast, reliable, and low cost biamperometric flow‐injection method, with an error of 1.3% and an analytical throughput of 55 samples h−1, for determination of tetracycline hydrochloride in pharmaceuticals capsules is proposed. The analytical curve was linear (r=0.998) in the range 10 to 50 mg l−1 using Fe(CN)6 3− and NaOH solutions as reagent and carrier stream/supporting electrolyte, respectively. A relative standard deviation of 1.6% (10 sequential injections of 30.0 mg l−1) was verified with detection and quantification limits of 0.6 and 3.4 mg l−1, respectively.

All authors are honoured with CAPES and CNPq scholarship, respectively.

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