A.H. Abbaszadeh
The influence of charge on the multiple thermal transitions observed in xanthan
Abbaszadeh, A.H.; Lad, M.; Morris, G.A.; MacNaughtan, W.; Sworn, G.; Foster, T.J.
Authors
M. Lad
G.A. Morris
W. MacNaughtan
G. Sworn
T.J. Foster
Abstract
Helix-coil transitions in xanthans occur at lower temperatures when the pyruvate group is charged, destabilising the polymer chains. Increasing salt content increases the transition temperature by reducing the effective charge on the pyruvate. A simple equivalent mass action model predicts how transition temperatures change as a function of salt concentration. The functional form of the change in transition temperature (1/T) versus natural log (salt concentration) is approximately linear and similar to more traditional polyelectrolyte theories. Transition temperatures in xanthans containing nominally homogeneous pyruvate contents show biphasic transitions, this is because the phases contain different pyruvate levels, however the transitions approach one another in temperature and eventually merge as salt content is increased. It is proposed that pyruvate groups, despite being present at a lower concentration relative to glucuronic acid, dominate the charge interactions due to their location on the outside of the helices.
Citation
Abbaszadeh, A., Lad, M., Morris, G., MacNaughtan, W., Sworn, G., & Foster, T. (2019). The influence of charge on the multiple thermal transitions observed in xanthan. Food Hydrocolloids, 97, Article 105184. https://doi.org/10.1016/j.foodhyd.2019.105184
Journal Article Type | Article |
---|---|
Acceptance Date | Jun 24, 2019 |
Online Publication Date | Jun 25, 2019 |
Publication Date | Dec 1, 2019 |
Deposit Date | Sep 17, 2019 |
Publicly Available Date | Mar 29, 2024 |
Journal | Food Hydrocolloids |
Print ISSN | 0268-005X |
Electronic ISSN | 1873-7137 |
Publisher | Elsevier |
Peer Reviewed | Peer Reviewed |
Volume | 97 |
Article Number | 105184 |
DOI | https://doi.org/10.1016/j.foodhyd.2019.105184 |
Keywords | Food Science; General Chemistry; General Chemical Engineering |
Public URL | https://nottingham-repository.worktribe.com/output/2625248 |
Publisher URL | https://www.sciencedirect.com/science/article/pii/S0268005X18313614 |
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