Evaluation of Norrish's equation for correlating the water activity of highly concentrated solutions of sugars, polyols and polyethylene glycols

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 mo...

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Autores principales: Baeza, Rosa, Pérez, Adriana, Sánchez, Virginia, Zamora, María Clara, Chirife, Jorge
Otros Autores: Universidad Católica Argentina. Facultad de Ciencias Agrarias
Formato: Artículo
Lenguaje:Inglés
Publicado: 2019
Materias:
ACTIVIDAD DEL AGUA
AZUCARES
ECUACION DE NORRISH
ALIMENTOS
Acceso en línea:https://repositorio.uca.edu.ar/handle/123456789/5462
Aporte de:
Repositorio Institucional de la Universidad Católica Argentina (UCA) de Universidad Católica Argentina
id I33-R139123456789-5462
record_format dspace
institution Universidad Católica Argentina
institution_str I-33
repository_str R-139
collection Repositorio Institucional de la Universidad Católica Argentina (UCA)
language Inglés
topic ACTIVIDAD DEL AGUA
AZUCARES
ECUACION DE NORRISH
ALIMENTOS
spellingShingle ACTIVIDAD DEL AGUA
AZUCARES
ECUACION DE NORRISH
ALIMENTOS
Baeza, Rosa
Pérez, Adriana
Sánchez, Virginia
Zamora, María Clara
Chirife, Jorge
Evaluation of Norrish's equation for correlating the water activity of highly concentrated solutions of sugars, polyols and polyethylene glycols
topic_facet ACTIVIDAD DEL AGUA
AZUCARES
ECUACION DE NORRISH
ALIMENTOS
description 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.
author2 Universidad Católica Argentina. Facultad de Ciencias Agrarias
author_facet Universidad Católica Argentina. Facultad de Ciencias Agrarias
Baeza, Rosa
Pérez, Adriana
Sánchez, Virginia
Zamora, María Clara
Chirife, Jorge
format Artículo
author Baeza, Rosa
Pérez, Adriana
Sánchez, Virginia
Zamora, María Clara
Chirife, Jorge
author_sort Baeza, Rosa
title Evaluation of Norrish's equation for correlating the water activity of highly concentrated solutions of sugars, polyols and polyethylene glycols
title_short Evaluation of Norrish's equation for correlating the water activity of highly concentrated solutions of sugars, polyols and polyethylene glycols
title_full Evaluation of Norrish's equation for correlating the water activity of highly concentrated solutions of sugars, polyols and polyethylene glycols
title_fullStr Evaluation of Norrish's equation for correlating the water activity of highly concentrated solutions of sugars, polyols and polyethylene glycols
title_full_unstemmed Evaluation of Norrish's equation for correlating the water activity of highly concentrated solutions of sugars, polyols and polyethylene glycols
title_sort evaluation of norrish's equation for correlating the water activity of highly concentrated solutions of sugars, polyols and polyethylene glycols
publishDate 2019
url https://repositorio.uca.edu.ar/handle/123456789/5462
work_keys_str_mv AT baezarosa evaluationofnorrishsequationforcorrelatingthewateractivityofhighlyconcentratedsolutionsofsugarspolyolsandpolyethyleneglycols
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