Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10601810 | Carbohydrate Polymers | 2013 | 6 Pages |
Abstract
The crystal structures of hydrated and anhydrous (1â3)-β-d-xylan and the crystal transition between them were investigated. Highly crystalline samples of (1â3)-β-d-xylan were prepared from a siphoneous green alga, Penicillus dumetosus. The crystal structure was analyzed using synchrotron X-ray diffraction and solid-state 13C NMR spectroscopy. The hydrated form was converted to the anhydrous form with contraction in both the a-axis and c-axis directions, and the crystallinity decreased considerably at the same time. The crystal transition between hydrated and anhydrous (1â3)-β-d-xylan was monitored using synchrotron X-ray diffraction under controlled relative humidity. The transition took place at certain transition points, and was accompanied by a large hysteresis. From the difference in the weight and unit-cell volume at the transition points, the number of water molecules in the hydrated form was estimated as one per xylose residue.
Related Topics
Physical Sciences and Engineering
Chemistry
Organic Chemistry
Authors
Kayoko Kobayashi, Satoshi Kimura, Laurent Heux, Masahisa Wada,