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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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 |
_version_ |
1782027674212892672 |