Cellulose-pectin composite hydrogels: intermolecular interactions and material properties depend on order of assembly

Lopez-Sanchez, Patricia, Martinez-Sanz, Marta, Bonilla, Mauricio R., Wang, Dongjie, Gilbert, Elliot P., Stokes, Jason R. and Gidley, Michael J. (2017) Cellulose-pectin composite hydrogels: intermolecular interactions and material properties depend on order of assembly. Carbohydrate Polymers: a journal devoted to scientific and technological aspects of industrially relevant polysaccharides, 162 71-81. doi:10.1016/j.carbpol.2017.01.049

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Author Lopez-Sanchez, Patricia
Martinez-Sanz, Marta
Bonilla, Mauricio R.
Wang, Dongjie
Gilbert, Elliot P.
Stokes, Jason R.
Gidley, Michael J.
Title Cellulose-pectin composite hydrogels: intermolecular interactions and material properties depend on order of assembly
Journal name Carbohydrate Polymers: a journal devoted to scientific and technological aspects of industrially relevant polysaccharides   Check publisher's open access policy
ISSN 0144-8617
1879-1344
Publication date 2017-04-15
Year available 2017
Sub-type Article (original research)
DOI 10.1016/j.carbpol.2017.01.049
Open Access Status File (Author Post-print)
Volume 162
Start page 71
End page 81
Total pages 11
Place of publication Kidlington, Oxford, United Kingdom
Publisher Pergamon Press
Language eng
Abstract Plant cell walls have a unique combination of strength and flexibility however, further investigations are required to understand how those properties arise from the assembly of the relevant biopolymers. Recent studies indicate that Ca2+-pectates can act as load-bearing components in cell walls. To investigate this proposed role of pectins, bioinspired wall models were synthesised based on bacterial cellulose containing pectin-calcium gels by varying the order of assembly of cellulose/pectin networks, pectin degree of methylesterification and calcium concentration. Hydrogels in which pectin-calcium assembly occurred prior to cellulose synthesis showed evidence for direct cellulose/pectin interactions from small angle scattering (SAXS and SANS), had the densest networks and the lowest normal stress. The strength of the pectin-calcium gel affected cellulose structure, crystallinity and material properties. The results highlight the importance of the order of assembly on the properties of cellulose composite networks and support the role of pectin in the mechanics of cell walls. (C) 2017 Elsevier Ltd. All rights reserved.
Formatted abstract
Plant cell walls have a unique combination of strength and flexibility however, further investigations are required to understand how those properties arise from the assembly of the relevant biopolymers. Recent studies indicate that Ca2+-pectates can act as load-bearing components in cell walls. To investigate this proposed role of pectins, bioinspired wall models were synthesised based on bacterial cellulose containing pectin-calcium gels by varying the order of assembly of cellulose/pectin networks, pectin degree of methylesterification and calcium concentration. Hydrogels in which pectin-calcium assembly occurred prior to cellulose synthesis showed evidence for direct cellulose/pectin interactions from small-angle scattering (SAXS and SANS), had the densest networks and the lowest normal stress. The strength of the pectin-calcium gel affected cellulose structure, crystallinity and material properties. The results highlight the importance of the order of assembly on the properties of cellulose composite networks and support the role of pectin in the mechanics of cell walls.
Keyword Cellulose
Mechanics
Pectin
SANS
SAXS
XRD
Q-Index Code C1
Q-Index Status Provisional Code
Grant ID CE110001007
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemical Engineering Publications
HERDC Pre-Audit
Queensland Alliance for Agriculture and Food Innovation
 
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