Comparative heterogeneity, molecular weights and viscosities of xanthans of different pyruvate and acetate content
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...
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| Format: | Article |
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Elsevier
2014
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| Online Access: | https://eprints.nottingham.ac.uk/42758/ |
| _version_ | 1848796560604790784 |
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| author | Erten, Tayyibe Adams, Gary G. Foster, Timothy J. Harding, Stephen E. |
| author_facet | Erten, Tayyibe Adams, Gary G. Foster, Timothy J. Harding, Stephen E. |
| author_sort | Erten, Tayyibe |
| building | Nottingham Research Data Repository |
| collection | Online Access |
| description | 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. |
| first_indexed | 2025-11-14T19:49:56Z |
| format | Article |
| id | nottingham-42758 |
| institution | University of Nottingham Malaysia Campus |
| institution_category | Local University |
| last_indexed | 2025-11-14T19:49:56Z |
| publishDate | 2014 |
| publisher | Elsevier |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | nottingham-427582020-05-04T16:58:38Z https://eprints.nottingham.ac.uk/42758/ 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. 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. Elsevier 2014-12-15 Article PeerReviewed Erten, Tayyibe, Adams, Gary G., Foster, Timothy J. and Harding, Stephen E. (2014) Comparative heterogeneity, molecular weights and viscosities of xanthans of different pyruvate and acetate content. Food Hydrocolloids, 42 . pp. 335-341. ISSN 0268-005X Xanthan ; Pyruvate ; Molecular weight ; Ultracentrifugation http://www.sciencedirect.com/science/article/pii/S0268005X14001428 doi:10.1016/j.foodhyd.2014.04.012 doi:10.1016/j.foodhyd.2014.04.012 |
| spellingShingle | Xanthan ; Pyruvate ; Molecular weight ; Ultracentrifugation Erten, Tayyibe Adams, Gary G. Foster, Timothy J. Harding, Stephen E. Comparative heterogeneity, molecular weights and viscosities of xanthans of different pyruvate and acetate content |
| title | Comparative heterogeneity, molecular weights and viscosities of xanthans of different pyruvate and acetate content |
| title_full | Comparative heterogeneity, molecular weights and viscosities of xanthans of different pyruvate and acetate content |
| title_fullStr | Comparative heterogeneity, molecular weights and viscosities of xanthans of different pyruvate and acetate content |
| title_full_unstemmed | Comparative heterogeneity, molecular weights and viscosities of xanthans of different pyruvate and acetate content |
| title_short | Comparative heterogeneity, molecular weights and viscosities of xanthans of different pyruvate and acetate content |
| title_sort | comparative heterogeneity, molecular weights and viscosities of xanthans of different pyruvate and acetate content |
| topic | Xanthan ; Pyruvate ; Molecular weight ; Ultracentrifugation |
| url | https://eprints.nottingham.ac.uk/42758/ https://eprints.nottingham.ac.uk/42758/ https://eprints.nottingham.ac.uk/42758/ |