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Determination of the unfrozen water content of maximally freeze-concentrated carbohydrate solutions

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
0141-8130
227-232
Hatley, Ross H.M.
50543883-aa3c-4cb8-abd6-f72a4966c276
Mant, Alexandra
63319e45-deeb-45ad-a30d-e05b42052a0d
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), 227-232. (doi:10.1016/0141-8130(93)90042-K).

Record type: Article

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.

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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
ORCID for Alexandra Mant: ORCID iD orcid.org/0000-0001-7169-209X

Catalogue record

Date deposited: 14 Aug 2017 16:31
Last modified: 13 Jun 2019 00:35

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Contributors

Author: Ross H.M. Hatley
Author: Alexandra Mant ORCID iD

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