期刊
CARBOHYDRATE POLYMERS
卷 78, 期 1, 页码 66-71出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2009.03.031
关键词
Chitosan; N-acetylation; N-deacetylation; Alkali
资金
- National Natural Science Foundation of China [50773070]
- Key Basic Research Development Plan [2005CB623902]
- Grand Science and Technology Special Project of Zhejiang Province [2008C11087]
Two kinds of chitosans, namely N-acetylated and N-deacetylated chitosan were prepared by the modified processes. They can dissolve in both acid and alkali solution. C-13 NMR was used to study the basic solution of chitosan, and XRD, FT-IR and SEM were used to study the structure of N-acetylated and N-deacetylated chitosan. The result from X-ray diffraction showed that a transformation of crystal structure occurred during the N-acetylation or N-deacetylation process with the decrease of crystallinity and expansion of crystal lattices. FT-IR spectra revealed that the intermolecular and intramolecular hydrogen bonds were destroyed by both treatments and a looser structure was observed by the SEM. The lower crystallinity, the decreased intermolecular interactions, the more disordered and looser structure were easy for the permeation of LiOH/urea aqueous solution and coordinated with the breakage of intermolecular and intramolecular hydrogen bond by LiOH at low temperature, the prepared chitosans dissolved in LiOH/urea/H2O mixture. (C) 2009 Elsevier Ltd. All rights reserved.
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