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A Multicommuted Flow Analysis Method for the Photometric Determination of Amoxicillin in Pharmaceutical Formulations using a Diazo Coupling Reaction

Title
A Multicommuted Flow Analysis Method for the Photometric Determination of Amoxicillin in Pharmaceutical Formulations using a Diazo Coupling Reaction
Type
Article in International Scientific Journal
Year
2011
Authors
Sueny K B Freitas
(Author)
Other
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Valdinete Lins da Silva
(Author)
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Alberto N Araujo
(Author)
FFUP
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Maria Conceicao B S M Montenegro
(Author)
FFUP
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Boaventura F Reis
(Author)
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Ana Paula S Paim
(Author)
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Journal
Vol. 22
Pages: 279-285
ISSN: 0103-5053
Indexing
Scientific classification
FOS: Natural sciences > Chemical sciences
CORDIS: Health sciences > Pharmacological sciences
Other information
Authenticus ID: P-002-VNR
Resumo (PT): Neste trabalho foi proposto um método de análise em fluxo por multicomutação para a determinação de amoxicilina em formulações farmacêuticas. O método proposto é baseado na reação de diazotização da o-nitroanilina com amoxicilina em meio alcalino, produzindo um composto amarelo que foi monitorado em 435 nm. As características do método foram: faixa linear de 25 até 400 mg L-1 de amoxicilina, limite de detecção de 5,1 mg L-1, frequência analítica de 50 determinações por hora e desvio padrão relativo inferior a 3,9% (n = 10) para uma amostra típica de 100 mg L-1 amoxicilina. Para verificar a exatidão do método, as amostras foram analisadas empregando um método independente e aplicando-se o teste-t pareado não houve diferença significativa no nível de confiança de 95%. <br> <br> Keywords: amoxicillin, multicommuted flow analysis, photometry, diazo coupling reaction, o-nitroaniline <br> <a target="_blank" href="http://jbcs.sbq.org.br/online/2011/vol22_n2/12-10324AR.pdf "> Texto integral </a> <br> <br>
Abstract (EN): A multicommuted flow analysis method for the spectrophotometric determination of amoxicillin in pharmaceutical formulations is reported. The proposed method is based on the reaction of diazotised o-nitroaniline with amoxicillin in an alkaline medium, producing a yellow compound that was monitored at 435 nm. The main features of the method were: a linear relationship with amoxicillin concentration ranging from 25 to 400 mg L(-1); a detection limit of 5.1 mg L(-1); an analytical throughput of 50 determinations per hour; and a relative standard deviation lower than 3.9% for a typical amoxicillin sample with concentration of 100 mg L(-1) (n = 10). To verify the accuracy of the method, samples were also analyzed employing an independent method, and applying the paired t-est to the results no significant difference at the 95% confidence level was observed.
Language: English
Type (Professor's evaluation): Scientific
No. of pages: 7
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