In vitro synthesis and properties of pectin/Acetobacter xylinus cellulose composites

Chanliaud, Elisabeth and Gidley, Michael J. (1999) In vitro synthesis and properties of pectin/Acetobacter xylinus cellulose composites. Plant Journal, 20 1: 25-35. doi:10.1046/j.1365-313X.1999.00571.x

Author Chanliaud, Elisabeth
Gidley, Michael J.
Title In vitro synthesis and properties of pectin/Acetobacter xylinus cellulose composites
Journal name Plant Journal   Check publisher's open access policy
ISSN 0960-7412
Publication date 1999-10
Sub-type Article (original research)
DOI 10.1046/j.1365-313X.1999.00571.x
Volume 20
Issue 1
Start page 25
End page 35
Total pages 11
Place of publication Oxford, United Kingdom
Publisher Wiley-Blackwell Publishing
Language eng
Abstract Pectin and cellulose are major components of most primary cell walls, yet little is known about the way in which they interact either during assembly or in subsequent functional performance of the wall. As a mimic of cell wall assembly, we studied the formation of molecular composites formed by deposition of cellulose from Acetobacter xylinus into pectin/calcium systems, and the molecular, architectural and mechanical properties of the composites obtained. The formation of interpenetrating cellulose/pectin composite networks (as envisaged in current models for primary cell walls) required a pre-existing, but not too strong, pectin network. For pectin either in solution or strongly networked, phase separation from cellulose occurred, providing two physical models for the formation of middle lamellae. Composite networks showed no evidence of direct molecular interaction between the components, but pectin networks became more aggregated following deposition of cellulose into them. The shear strength under small deformation conditions for cellulose/pectin composites was very similar to that of cellulose alone. In contrast, under uniaxial tension, extensibility was greatly increased and stiffness decreased. These major changes were due to the effect of pectin on cellulose network architecture at deposition, as they were maintained upon removal of the pectin component. These results show that the presence and physical state of pectin at the time of cellulose deposition in muro may be a significant determinant of subsequent extensibility without compromising strength.
Keyword Plant cell walls
C-13 NMR
Polygalacturonase isoenzymes
Bacterial cellulose
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ
Additional Notes Article first published online: 5 January 2002.

Document type: Journal Article
Sub-type: Article (original research)
Collection: Centre for Nutrition and Food Sciences Publications
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Created: Wed, 16 Mar 2011, 20:30:31 EST