Ordered conformation of xanthan in solutions and "weak gels": single helix, double helix – or both?

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dc.contributor.author Morris, Edwin R.
dc.date.accessioned 2018-01-03T11:19:11Z
dc.date.available 2018-01-03T11:19:11Z
dc.date.issued 2017-11-24
dc.identifier.citation Morris, E. R. (2017) 'Ordered conformation of xanthan in solutions and "weak gels": single helix, double helix – or both?', Food Hydrocolloids, 86, pp. 18-25. doi:10.1016/j.foodhyd.2017.11.036 en
dc.identifier.volume 86
dc.identifier.startpage 18
dc.identifier.endpage 25
dc.identifier.issn 0268-005X
dc.identifier.uri http://hdl.handle.net/10468/5212
dc.identifier.doi 10.1016/j.foodhyd.2017.11.036
dc.description.abstract During the progress of xanthan from a recent discovery to its present status as a well-established food hydrocolloid, some investigations have indicated that the ordered structure, which underlies most of the practical applications of xanthan, is a single helix stabilised by ordered packing of sidechains along the polymer backbone, giving first-order kinetics for the disorderâ order transition. Others favoured a coaxial double helix, whose formation causes a doubling of molecular weight and mass per unit length. It is proposed here that both interpretations are correct, and that ordering is a 2-stage process: formation of single helices followed, under favourable conditions, by enthalpically-driven conversion to coaxial double helices. Comparison of recent evidence from atomic force microscopy with models from analysis of X-ray fibre diffraction data suggests that the most likely coaxial arrangement is an antiparallel 51 double helix. en
dc.format.mimetype application/pdf en
dc.language.iso en en
dc.publisher Elsevier Ltd en
dc.rights © 2017, Elsevier Ltd. All rights reserved. This manuscript version is made available under the CC-BY-NC-ND 4.0 license. en
dc.rights.uri http://creativecommons.org/licenses/by-nc-nd/4.0/ en
dc.subject Xanthan en
dc.subject Conformation en
dc.subject Single helix en
dc.subject Double helix en
dc.subject Light scattering en
dc.subject Optical rotation en
dc.title Ordered conformation of xanthan in solutions and "weak gels": single helix, double helix – or both? en
dc.type Article (peer-reviewed) en
dc.internal.authorcontactother Edwin Morris, Pensioners, University College Cork, Cork, Ireland. +353-21-490-3000 Email: ed.morris@ucc.ie en
dc.internal.availability Full text available en
dc.check.info Access to this article is restricted until 12 months after publication by request of the publisher. en
dc.check.date 2018-11-24
dc.date.updated 2017-11-30T11:27:01Z
dc.description.version Accepted Version en
dc.internal.rssid 419812131
dc.description.status Peer reviewed en
dc.identifier.journaltitle Food Hydrocolloids en
dc.internal.copyrightchecked Yes en
dc.internal.licenseacceptance Yes en
dc.internal.IRISemailaddress ed.morris@ucc.ie en


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© 2017, Elsevier Ltd. All rights reserved. This manuscript version is made available under the CC-BY-NC-ND 4.0 license. Except where otherwise noted, this item's license is described as © 2017, Elsevier Ltd. All rights reserved. This manuscript version is made available under the CC-BY-NC-ND 4.0 license.
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