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Comparative heterogeneity, molecular weights and viscosities of xanthans of different pyruvate and acetate content

Erten, Tayyibe; Adams, Gary G.; Foster, Timothy J.; Harding, Stephen E.

Authors

Tayyibe Erten

Gary G. Adams

Timothy J. Foster

Profile image of STEPHEN HARDING

STEPHEN HARDING STEVE.HARDING@NOTTINGHAM.AC.UK
Professor of Applied Biochemistry



Abstract

Introduction: The bacterial exopolysaccharide xanthan is a well-known hydrocolloid, with a high viscosity deriving from its large molecular weight and volume.
Materials and methods: Four different xanthans deriving from Xanthomanas campestris -two with similar pyruvate and acetate contents and two with different contents e were characterized in dilute aqueous buffered solution (pH 7.0, ionic strength 0.3 M) using sedimentation velocity and sedimentation equilibrium in the analytical ultracentrifuge, supplemented by dynamic light scattering.
Results: This facilitated a comparison with regards heterogeneity (sedimentation coefficient distribution) and molecular weight, despite their large size and low critical overlap concentration. The xanthans were also compared with regard to reduced specific and intrinsic viscosity behaviour. The xanthans generally show strong similarity in properties with the exception of the lowest pyruvate xanthan, a finding which should be useful for future applications of these materials.

Citation

Erten, T., Adams, G. G., Foster, T. J., & Harding, S. E. (2014). Comparative heterogeneity, molecular weights and viscosities of xanthans of different pyruvate and acetate content. Food Hydrocolloids, 42, https://doi.org/10.1016/j.foodhyd.2014.04.012

Journal Article Type Article
Acceptance Date Apr 2, 2014
Online Publication Date Apr 13, 2014
Publication Date Dec 15, 2014
Deposit Date May 11, 2017
Journal Food Hydrocolloids
Print ISSN 0268-005X
Electronic ISSN 1873-7137
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 42
DOI https://doi.org/10.1016/j.foodhyd.2014.04.012
Keywords Xanthan ; Pyruvate ; Molecular weight ; Ultracentrifugation
Public URL https://nottingham-repository.worktribe.com/output/740840
Publisher URL http://www.sciencedirect.com/science/article/pii/S0268005X14001428
Contract Date May 11, 2017