2003
DOI: 10.1248/bpb.26.1211
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Spectrophotometric and Fluorimetric Determination of Hexamine in Pure Form and Its Pharmaceutical Formulation

Abstract: Ethyl acetoacetate and methyl acetoacetate have been tested for the determination of hiprex (methenamine hippurate). Both the esters react with hexamine and hiprex forming fluorescent yellow Hantzsch esters. The products show absorption maximum at 370 nm and a fluorescence emission maximum at 465 nm in aqueous n-propanol. Important parameters such as pH, temperature, mole ratio and time of reaction have been optimized. The co-efficient of variation for inter and intra-day precisions were less than 1%. The chro… Show more

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Cited by 8 publications
(6 citation statements)
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“…Experimental solutions of the desired concentrations were obtained by successive dilutions. Determination of hexamine was performed based on the absorption measurement of Hantzsch ethyl ester, formed upon reacting ethyl acetoacetate with hexamine, using a UV-spectrophotometer at 370 nm (Balasubramanian et al 2003). The calibration curve for hexamine was linear from 1 to 130 mg/L (R 2 = 0.99).…”
Section: Determination Of Hexaminementioning
confidence: 99%
“…Experimental solutions of the desired concentrations were obtained by successive dilutions. Determination of hexamine was performed based on the absorption measurement of Hantzsch ethyl ester, formed upon reacting ethyl acetoacetate with hexamine, using a UV-spectrophotometer at 370 nm (Balasubramanian et al 2003). The calibration curve for hexamine was linear from 1 to 130 mg/L (R 2 = 0.99).…”
Section: Determination Of Hexaminementioning
confidence: 99%
“…2007). Hexamine has been known to exhibit antimicrobial activity and has been used to treat urinary tract infections in the past (Balasubramanian et al. 2003).…”
Section: Introductionmentioning
confidence: 99%
“…Comparativamente à literatura, as potencialidades analíticas do método são bastante aceitáveis e promissoras, já que os artigos publicados mais recentemente para a quantificação de HMT em formulações farmacêuticas apresentam limites de detecção maiores do que o método aqui proposto, faixas de trabalho geralmente mais elevadas e ainda necessitam utilizar solventes orgânicos. 27 Os mais recentes estudos apresentaram faixas de trabalho em HMT que variaram de 2,0-35,0 mg L -1 por espectrofotometria, 27 0,6-40 mg L -1 por fluorimetria 27 e 35,0-7000 mg L -1 por cromatografia líquida de alta eficiência. 28 Quando se leva em conta o limite inferior da faixa linear, chega-se à conclusão de que o método aqui proposto apresenta um valor de 20, 6 e 350 vezes mais baixo para quantificação de HMT, respectivamente, mostrando maior sensibilidade do que os demais.…”
Section: Resultsunclassified
“…28 Quando se leva em conta o limite inferior da faixa linear, chega-se à conclusão de que o método aqui proposto apresenta um valor de 20, 6 e 350 vezes mais baixo para quantificação de HMT, respectivamente, mostrando maior sensibilidade do que os demais. 27,28 Apesar de frequentemente as metodologias envolvendo cromatografia líquida apresentarem uma melhor sensibilidade quando comparadas às espectrofotométricas, não é o caso quando o analito é HMT.…”
Section: Resultsunclassified