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Control of the properties of xanthan / glucomannan mixed gels by varying xanthan fine structure

Fitzpatrick, P, Meadows, J, Ratcliffe, Ian and Williams, Peter A (2013) Control of the properties of xanthan / glucomannan mixed gels by varying xanthan fine structure. Carbohydrate Polymers, 92. pp. 1018-1025. ISSN 0144-8617

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Abstract

The interaction of native xanthan gum, deacetylated xanthan gum and depyruvated xanthan gum with konjac glucomannan has been studied using DSC and controlled stress rheometry. In the absence of electrolyte the DSC cooling curves for native xanthan and deacetylated xanthan showed a single peak and there was a corresponding sharp increase in the storage modulus indicating gel formation. It is apparent that on cooling, association of the konjac glucomannan with the native xanthan molecules is triggered by the xanthan coil-helix transition. In the presence of electrolyte, there were two DSC peaks observed. The higher temperature DSC peak was attributed to the xanthan coil-helix transition while the lower temperature DSC peak was attributed to konjac glucomannan – xanthan association as noted by an increase in the storage modulus. The gels formed were much weaker than those in the absence of electrolyte. The DSC cooling curves for depyruvated xanthan in the absence of electrolyte showed two peaks. The higher temperature peak was attributed to the coil-helix transition while the lower temperature peak corresponded to gelation as noted by an increase in the storage modulus. The gels were very much weaker than for native xanthan gum and deacetylated xanthan gum.

Item Type: Article
Keywords: Konjac glucomannan, xanthan gum, thermoreversible gels, DSC, coil-helix transition
Divisions: Applied Science, Computing and Engineering
Depositing User: Mr Stewart Milne
Date Deposited: 27 Feb 2015 13:53
Last Modified: 19 Dec 2017 15:28
URI: http://glyndwr.collections.crest.ac.uk/id/eprint/8267

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