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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| Otros Autores: | , |
| Formato: | Capítulo de libro |
| Lenguaje: | Inglés |
| Publicado: |
1994
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| Acceso en línea: | Registro en Scopus DOI Handle Registro en la Biblioteca Digital |
| Aporte de: | Registro referencial: Solicitar el recurso aquí |
| Sumario: | 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. |
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| Bibliografía: | AOAC, (1983) Official Methods of Analysis, , Association of Official Agricultural Chemists, Washington, DC, USA Alzamora, Chirife, The water activity of 1,3- and 2,3-butylene glycol solutions (1984) Lebensm. Wiss. u Technol., 17, pp. 268-270 Chirife, Ferro Fontán, Benmergui, The prediction of water activity in aqueous solutions in connection with intermediate moisture foods. IV. aw prediction in non-electrolyte solutions (1980) International Journal of Food Science & Technology, 15, pp. 59-70 Chirife, Favetto, Scorza, The water activity of common liquid bacteriological media (1982) J. Applied Bacteriol., 53, pp. 219-222 Chirife, Favetto, Ferro Fontán, Microbial growth at reduced water activity: some physicochemical properties of compatible solutes (1984) J. Applied Bacteriol., 56, pp. 259-268 Di Paola, Belleau, Polyol-water interactions Apparent molal heat capacities and volumes of aqueous polyol solutions (1977) Canadian Journal of Chemistry, 55, pp. 3825-3830 Ferro Fontán, Chirife, The evaluation of water activity in aqueous solutions from freezing point depression (1981) International Journal of Food Science & Technology, 16, pp. 21-26 Heidelbaugh, Karel, Intermediate moisture food technology (1975) Freeze Drying and Advanced Food Technology, p. 618. , S.A. Goldblith, L. Rey, W.W. Rothmayr, Academic Press, New York Kamman, Tatini, Labuza, Effect of water activity on nuclease production by Staphylococcus aureus (1978) Journal of Food Science, 43, pp. 1282-1285 Loncin, Basic principles of moisture equilibria (1975) Freeze Drying and Advanced Food Technology, p. 611. , S.A. Goldblith, L. Rey, W.W. Rothmayr, Academic Press, New York Miracco, Alzamora, Chirife, Ferro Fontán, On the water activity of lactose solutions (1981) Journal of Food Science, 46, pp. 1612-1613 Norrish, An equation for the activity coefficients and equilibrium relative humidities of water in confectionary syrups (1966) International Journal of Food Science & Technology, 1, pp. 25-30 Okamoto, Wood, Freezing point of aqueous alcohols. Free energy of interaction of the CHOH, CH2, CONH and CC functional groups in dilute aqueous solutions (1978) J. Chem. Soc., Faraday Transac., 74, pp. 1990-2007 Plitman, Park, Gómez, Sinskey, Viability of Staphylococcus aureus in intermediate moisture meats (1973) Journal of Food Science, 41, pp. 1004-1008 Pollio, Kitic, Favetto, Chirife, Effectiveness of available filters for an electric hygrometer for measurement of water activity in the food industry (1986) J. Food Science, 55, pp. 1357-1358 Sloan, Labuza, Humectant water sorption isotherms (1975) Food Prod. Develop., p. 70. , December Sloan, Labuza, Prediction of water activity lowering ability of food humectants at high aw (1976) Journal of Food Science, 41, pp. 532-535 Verlinde, Verbeeck, Thun, Density and vapour pressure of the propylene glycol-water system from 15 to 50°C (1975) Bulletin des Sociétés Chimiques Belges, 84, pp. 1119-1130 Weast, (1985) CRC Handbook of Chemistry and Physics, , CRC Press, Boca Raton, Florida, USA |
| ISSN: | 09639969 |
| DOI: | 10.1016/0963-9969(94)90179-1 |