Journal
CARBOHYDRATE RESEARCH
Volume 343, Issue 2, Pages 221-229Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carres.2007.11.008
Keywords
plant cell walls; xyloglucan; cellulose; Gluconoacetobacter xylinus; solid-state C-13 NMR; WAXS (wide-angle X-ray scattering)
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Model composites, produced using cellulose from stationary cultures of the bacterium Gluconoacetobacter xylinus and tamarind xyloglucan, were examined by wide-angle X-ray scattering (WAXS) and CP/MAS solid-state C-13 NMR spectroscopy. The dominant crystallite allomorph of cellulose produced in culture media with or without xyloglucan was cellulose I-alpha (triclinic). The presence of xyloglucan in the culture medium reduced the cross-section dimensions of the cellulose crystallites, but did not affect the crystallite allomorph. However, when the composites were refluxed in buffer, the proportion of cellulose I-beta allomorph increased relative to that of cellulose I-alpha. In contrast, cellulose I-alpha remained the dominant form when cellulose, produced in the absence of xyloglucan, was then heated in the buffer. Hence the presence of xyloglucan has a profound effect on the formation of the cellulose crystallites by G. xylinus. (c) 2007 Elsevier Ltd. All rights reserved.
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