Determination and correlation of the water activity of propylene glycol solutions

The water activity (aw) of propylene glycol (PG) solutions in the range 2·03-8·65 g PG/100 g water is derived from the measurement of their freezing points. Resulting data follow closely Norrish's equation, aw = (1-X2) exp (-K X2 2), where X2 is the molar fraction of PG and K is a constant whic...

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Autores principales: Alzamora, S.M., Chirife, J., Gerschenson, L.N.
Formato: JOUR
Materias:
cryoscopic
Norrish equation
polyols
propylene glycol
water activity
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_09639969_v27_n1_p65_Alzamora
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_09639969_v27_n1_p65_Alzamora
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spelling todo:paper_09639969_v27_n1_p65_Alzamora2023-10-03T15:54:33Z Determination and correlation of the water activity of propylene glycol solutions Alzamora, S.M. Chirife, J. Gerschenson, L.N. cryoscopic Norrish equation polyols propylene glycol water activity The water activity (aw) of propylene glycol (PG) solutions in the range 2·03-8·65 g PG/100 g water is derived from the measurement of their freezing points. Resulting data follow closely Norrish's equation, aw = (1-X2) exp (-K X2 2), where X2 is the molar fraction of PG and K is a constant which may be related to the structure of the solute molecule. The dimensionless parameter K has a value of 4·04 ± 0·22. Some physico-chemical aspects of water activity lowering in propylene glycol solutions are discussed. © 1994. Fil:Alzamora, S.M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Gerschenson, L.N. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_09639969_v27_n1_p65_Alzamora
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic cryoscopic
Norrish equation
polyols
propylene glycol
water activity
spellingShingle cryoscopic
Norrish equation
polyols
propylene glycol
water activity
Alzamora, S.M.
Chirife, J.
Gerschenson, L.N.
Determination and correlation of the water activity of propylene glycol solutions
topic_facet cryoscopic
Norrish equation
polyols
propylene glycol
water activity
description The water activity (aw) of propylene glycol (PG) solutions in the range 2·03-8·65 g PG/100 g water is derived from the measurement of their freezing points. Resulting data follow closely Norrish's equation, aw = (1-X2) exp (-K X2 2), where X2 is the molar fraction of PG and K is a constant which may be related to the structure of the solute molecule. The dimensionless parameter K has a value of 4·04 ± 0·22. Some physico-chemical aspects of water activity lowering in propylene glycol solutions are discussed. © 1994.
format JOUR
author Alzamora, S.M.
Chirife, J.
Gerschenson, L.N.
author_facet Alzamora, S.M.
Chirife, J.
Gerschenson, L.N.
author_sort Alzamora, S.M.
title Determination and correlation of the water activity of propylene glycol solutions
title_short Determination and correlation of the water activity of propylene glycol solutions
title_full Determination and correlation of the water activity of propylene glycol solutions
title_fullStr Determination and correlation of the water activity of propylene glycol solutions
title_full_unstemmed Determination and correlation of the water activity of propylene glycol solutions
title_sort determination and correlation of the water activity of propylene glycol solutions
url http://hdl.handle.net/20.500.12110/paper_09639969_v27_n1_p65_Alzamora
work_keys_str_mv AT alzamorasm determinationandcorrelationofthewateractivityofpropyleneglycolsolutions
AT chirifej determinationandcorrelationofthewateractivityofpropyleneglycolsolutions
AT gerschensonln determinationandcorrelationofthewateractivityofpropyleneglycolsolutions
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