1H and 13C solid-state NMR of Gossypium barbadense (Pima) cotton

被引:19
作者
Taylor, R. E. [1 ]
French, Alfred D. [2 ]
Gamble, Gary R. [3 ]
Himmelsbach, David S. [4 ]
Stipanovic, Robert D. [5 ]
Thibodeaux, Devron P. [3 ]
Wakelyn, Phillip J. [6 ]
Dybowski, C. [7 ]
机构
[1] Univ Calif Los Angeles, Dept Chem & Biochem, Los Angeles, CA 90095 USA
[2] USDA, So Reg Res Ctr, ARS, New Orleans, LA 70179 USA
[3] USDA, Cotton Qual Res Stn, ARS, Clemson, SC USA
[4] USDA, Qual & Safety Assessment Res Unit, ARS, Athens, GA 30604 USA
[5] USDA, So Plains Agr Res Ctr, ARS, College Stn, TX 77845 USA
[6] Natl Cotton Council Amer, Washington, DC USA
[7] Univ Delaware, Dept Chem & Biochem, Newark, DE 19761 USA
基金
美国国家科学基金会;
关键词
NMR; H-1; C-13; CP/MAS; spin diffusion; goldman-shen; spin-lattice relaxation; T-1; cellulose; moisture; water; cotton; Gossypium barbadense;
D O I
10.1016/j.molstruc.2007.08.006
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The interaction of water with cellulose and its influence oil the nuclear spin dynamics in Gossypium barbadense (Pima) cotton were investigated by H-1 and C-13 solid-state NMR techniques. H-1 spin diffusion results from a Goldman-Shen experiment indicate that the water is multilayered. (1) H MAS experiments provide evidence of a range of correlation times for the water, indicative of molecular motion ranging from restricted to relatively mobile. The (1) H spin-lattice relaxation time varies with water content and is different for static and MAS conditions. By coupling the Goldman-Shen sequence with C-13 CP/MAS, cross-polarization from the molecularly mobile water protons distributes magnetization throughout the cellulose (as opposed to enhancing (13) C resonances from only the crystalline or the amorphous domains or from only the surface of the cellulose). However, spatial localization of the combined Goldman-Shen- C-13 CP/MAS experiment using both short mixing and contact times yields a spectrum consistent with predominantly the I-beta polymorph of cellulose. Longer mixing times and the same, short contact time yield a spectrum that is indicative of an increased I-alpha. polymorph content in the crystallite interiors relative to the smaller values found with short mixing times. Published by Elsevier B.V.
引用
收藏
页码:177 / 184
页数:8
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