DETERMINATION AND CORRELATION OF THE WATER ACTIVITY OF PROPYLENE-GLYCOL SOLUTIONS

Authors
ALZAMORA SM CHIRIFE J GERSCHENSON LN
Citation
Sm. Alzamora et al., DETERMINATION AND CORRELATION OF THE WATER ACTIVITY OF PROPYLENE-GLYCOL SOLUTIONS, Food research international, 27(1), 1994, pp. 65-67
Citations number
19
Categorie Soggetti
Food Science & Tenology
Journal title
Food research international → ACNP
ISSN journal
09639969
Volume
27
Issue
1
Year of publication
1994
Pages
65 - 67
Database
ISI
SICI code
0963-9969(1994)27:1<65:DACOTW>2.0.ZU;2-R
Abstract
The water activity (a(W)) of propylene glycol (PG) solutions in the ra nge 2.03-8.65 g PG/100g water is derived from the measurement of their freezing points. Resulting data follow closely Norrish's equation, a( W) (1-X(2)) exp (-K X(2)(2)), where X(2) is the molar fraction of PG a nd 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.