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Uncertainty in the Determination of Glucose and Sucrose in Solutions with Chitosan by Enzymatic Methods

Title
Uncertainty in the Determination of Glucose and Sucrose in Solutions with Chitosan by Enzymatic Methods
Type
Article in International Scientific Journal
Year
2013
Authors
Berta Nogueiro Estevinho
(Author)
FEUP
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Amélia Ferraz
(Author)
Other
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Lúcia Silveira Santos
(Author)
FEUP
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Fernando Rocha
(Author)
FEUP
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Journal
Vol. 24 No. 6
Pages: 931-938
ISSN: 0103-5053
Other information
Authenticus ID: P-006-ABQ
Resumo (PT): O objetivo deste trabalho foi determinar a aplicabilidade de dois métodos enzimáticos um para a quantificação da glucose e outro da sacarose em soluções aquosas contendo quitosano. Os métodos analíticos foram validados e os principais parâmetros determinados como limite de detecção, intervalo de linearidade, precisão e exatidão. A incerteza global do método enzimático da glucose foi inferior a 10% no intervalo de 700 a 2000 mg L-1, para o método de análise da sacarose a incerteza global foi inferior a 3% para todo o intervalo de análise (100-1000 mg L-1). Apesar da semelhança das performances com relação a outros métodos analíticos, o método enzimático provou ser mais adequado, em particular do que a cromatografia líquida de alta eficiência (HPLC), principalmente se um grande número de amostras deve ser analisado (permitindo um resultado rápido) e ainda devido às propriedades mucoadesivas do quitosano que dificultam as metodologias analíticas por HPLC, criando problemas de estabilidade na coluna cromatográfica.
Abstract (EN): The purpose of this work was to evaluate the applicability of two enzymatic methods to quantify glucose and sucrose in aqueous solutions with chitosan. The analytical methods were validated and the main parameters, as limit of detection, linearity range, precision and accuracy were determined. The global uncertainty for glucose enzymatic method was less than 10% for concentration levels between 700 and 2000 mg L-1, and for the sucrose enzymatic method, the global uncertainty showed values less than 3% for all concentration levels analyzed (100-1000 mg L-1). Despite the similarities of performances with respect to other analytical methods, the enzymatic method proved to be better than others, in particular high performance liquid-chromatography (HPLC), mainly if a great number of samples needs to be analyzed, allowing a quick result, and because the mucoadhesive properties of chitosan make difficult the HPLC analytical methodology, creating stability problems in the chromatographic column.
Language: English
Type (Professor's evaluation): Scientific
No. of pages: 8
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