Structure of Acetobacter cellulose composites in the hydrated state

被引:70
作者
Astley, OM
Chanliaud, E
Donald, AM
Gidley, MJ
机构
[1] Univ Cambridge, Cavendish Lab, Polymers & Colloids Grp, Cambridge CB3 0HE, England
[2] Unilever Res Colworth, Sharnbrook MK44 1LQ, Beds, England
基金
英国生物技术与生命科学研究理事会;
关键词
Acetobacter; bacterial cellulose; cell wall; X-ray scattering; environmental scanning electron microscopy;
D O I
10.1016/S0141-8130(01)00167-2
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
The structure of composites produced by the bacterium Acetobacter xylinus have been studied in their natural. hydrated. state. Small-angle X-ray diffraction and environmental scanning electron microscopy has shown that the ribbons have a width of 500 A and contain smaller semi-crystalline cellulose microfibrils with an essentially rectangular cross-section of approximate to 10 x 160 Angstrom (2). Incubation of Acetobacter in xyloglucan or pectin results in no changes in the size of either the microfibrils or the ribbons. Changes in the cellulose crystals are seen upon dehydration of the material, resulting in either a reduction in crystal size or an increase in crystal disorder. (C) 2001 Published by Elsevier Science B.V.
引用
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页码:193 / 202
页数:10
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