A CP/MAS C-13 NMR investigation of molecular ordering in celluloses

被引：323
作者：
Larsson, PT
Wickholm, K
Iversen, T
机构：
[1] Swed. Pulp and Paper Res. Institute, STFI, Box 5604
来源：
CARBOHYDRATE RESEARCH | 1997年 / 302卷 / 1-2期
关键词：
cellulose; CP/MAS C-13 NMR; supermolecular structure; order; allomorphs;
D O I：
10.1016/S0008-6215(97)00130-4
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 individual states of order of cellulose found within Valonia, Cladophora, Halocynthia, cotton and wood cellulose were quantified by non-linear least-squares fitting of the C-13 NMR spectra. The results from the spectral fittings indicated that a cellulose form giving signals at delta 104.5 (C-1 region) and delta 88.1-88.5 (C-4 region) was present in all the investigated samples. Partial signal suppression by spin-lattice relaxation supported the findings from the spectral fittings. The spectral behavior of this cellulose form indicates it is a less-ordered or a para-crystalline 'in core' structure with a somewhat larger mobility than the crystalline cellulose I alpha and I beta allomorphs. (C) 1997 Elsevier Science Ltd.
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页码：19 / 25
页数：7
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