Determination of the unfrozen water content of maximally freeze-concentrated carbohydrate solutions
Determination of the unfrozen water content of maximally freeze-concentrated carbohydrate solutions
The heat capacity change at T′g has been studied in freeze-concentrated carbohydrate solutions. The values obtained have been compared with those found for high concentration solutions that do not undergo freezing above Tg. The analysis has indicated that the freezing process influences the degree of stress in the glassy phase. This results in a complex power-time curve when frozen solutions are heated in a differential scanning calorimeter. The endotherm produced by the stress relaxation can cause considerable error in W′g measurement obtained by any method that relies on the integration of the power-time curve. A more reliable method for W′g determination is via the intersection of T′g with a previously prepared Tg/Wg calibration curve.
carbohydrate glass, freeze concentration, Glass, sucrose, unfrozen water
227-232
Hatley, Ross H.M.
50543883-aa3c-4cb8-abd6-f72a4966c276
Mant, Alexandra
63319e45-deeb-45ad-a30d-e05b42052a0d
August 1993
Hatley, Ross H.M.
50543883-aa3c-4cb8-abd6-f72a4966c276
Mant, Alexandra
63319e45-deeb-45ad-a30d-e05b42052a0d
Hatley, Ross H.M. and Mant, Alexandra
(1993)
Determination of the unfrozen water content of maximally freeze-concentrated carbohydrate solutions.
International Journal of Biological Macromolecules, 15 (4), .
(doi:10.1016/0141-8130(93)90042-K).
Abstract
The heat capacity change at T′g has been studied in freeze-concentrated carbohydrate solutions. The values obtained have been compared with those found for high concentration solutions that do not undergo freezing above Tg. The analysis has indicated that the freezing process influences the degree of stress in the glassy phase. This results in a complex power-time curve when frozen solutions are heated in a differential scanning calorimeter. The endotherm produced by the stress relaxation can cause considerable error in W′g measurement obtained by any method that relies on the integration of the power-time curve. A more reliable method for W′g determination is via the intersection of T′g with a previously prepared Tg/Wg calibration curve.
This record has no associated files available for download.
More information
Published date: August 1993
Keywords:
carbohydrate glass, freeze concentration, Glass, sucrose, unfrozen water
Identifiers
Local EPrints ID: 413058
URI: http://eprints.soton.ac.uk/id/eprint/413058
ISSN: 0141-8130
PURE UUID: bcc9c4fc-b4f4-4f82-b281-5f51608722f1
Catalogue record
Date deposited: 14 Aug 2017 16:31
Last modified: 16 Mar 2024 03:40
Export record
Altmetrics
Contributors
Author:
Ross H.M. Hatley
Author:
Alexandra Mant
Download statistics
Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.
View more statistics