Cellulose

, Volume 21, Issue 1, pp 275–289 | Cite as

Roles of xyloglucan and pectin on the mechanical properties of bacterial cellulose composite films

Original Paper

Abstract

Xyloglucan and pectin are major non-cellulosic components of most primary plant cell walls. It is believed that xyloglucan and perhaps pectin are functioning as tethers between cellulose microfibrils in the cell walls. In order to understand the role of xyloglucan and pectin in cell wall mechanical properties, model cell wall composites created using Gluconacetobacter xylinus cellulose or cellulose nanowhiskers (CNWs) derived there from with different amounts of xyloglucan and/or pectin have been prepared and measured under extension conditions. Compared with pure CNW films, CNW composites with lower amounts of xyloglucan or pectin did not show significant differences in mechanical behavior. Only when the additives were as high as 60 %, the films exhibited a slightly lower Young’s modulus. However, when cultured with xyloglucan or pectin, the bacterial cellulose (BC) composites produced by G. xylinus showed much lower modulus compared with that of the pure BC films. Xyloglucan was able to further reduce the modulus and extensibility of the film compared to that of pectin. It is proposed that surface coating or tethering of xyloglucan or pectin of cellulose microfibrils does not alone affect the mechanical properties of cell wall materials. The implication from this work is that xyloglucan or pectin alters the mechanical properties of cellulose networks during rather than after the cellulose biosynthesis process, which impacts the nature of the connection between these compounds.

Keywords

Bacterial cellulose Cellulose nanowhiskers Xyloglucan Pectin Mechanical testing Cellulose composites 

Supplementary material

10570_2013_115_MOESM1_ESM.doc (665 kb)
Supplementary material 1 (DOC 665 kb)

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Copyright information

© Springer Science+Business Media Dordrecht 2013

Authors and Affiliations

  1. 1.Intercollege Graduate Degree Program in Plant BiologyThe Pennsylvania State UniversityUniversity ParkUSA
  2. 2.Department of Agricultural and Biological EngineeringThe Pennsylvania State UniversityUniversity ParkUSA

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