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Título : | Evaluation of Norrish's equation for correlating the water activity of highly concentrated solutions of sugars, polyols and polyethylene glycols | Autor : | Baeza, Rosa Pérez, Adriana Sánchez, Virginia Zamora, María Clara Chirife, Jorge |
Otros colaboradores: | Universidad Católica Argentina. Facultad de Ciencias Agrarias | Palabras clave : | ACTIVIDAD DEL AGUA; AZUCARES; ECUACION DE NORRISH; ALIMENTOS | Fecha de publicación : | 2010 | Cita : | Baeza, R., Pérez, A., Sánchez, V., Zamora, M. C. and Chirife, J. (2010), Evaluation of Norrish's equation for correlating the water activity of highly concentrated solutions of sugars, polyols and polyethylene glycols [en línea]. Food and Bioprocess Technology, 3(1). doi: 10.1007/s11947-007-0052-8 Disponible en: https://repositorio.uca.edu.ar/handle/123456789/5462 | Resumen : | Abstract: Norrish’s equation, (aw = Xw exp (-K Xs 2), where aw is water activity, Xw and Xs molar fractions of water and solute, respectively, and K is the correlating constant), has been widely used to predict aw of aqueous non-electrolyte solutions in connection with development of intermediate moisture foods, i.e. food having aw ≥ 0.85. Present work evaluated the ability of Norrish’s equation to model the water activity of solutions of sugars, polyols and some polyethylenglycols, in a wide range of concentration; i.e. from low to highly concentrated solutions. For sugar and polyols a relatively small modification of the “most accepted” literature parameters K, allowed to fit the data for the whole range of solute concentrations(range of aw 0.99 to 0.3/0.4) with high accuracy. However, a modified Norrish’s model needs to be used to model the behavior of polyethylenglycols 400 and 600 up to water activities as low 0.4/0.5. | URI : | https://repositorio.uca.edu.ar/handle/123456789/5462 | Disciplina: | INGENIERIA EN ALIMENTOS | Derechos: | Acceso Abierto |
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