期刊
CARBOHYDRATE RESEARCH
卷 344, 期 7, 页码 944-947出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.carres.2009.03.002
关键词
Chitosan; Inclusion compounds; Lithium hydroxide; Stability; Urea
资金
- National Natural Science Foundation of China [50773070]
- Key Basic Research Development Plan (Project 973) of China [2005CB623902]
- Grand Science and Technology Special Project of Zhejiang Province [2008C11087]
A solution of partially N-deacetylated chitosan in aqueous lithium hydroxide (LiOH)/urea was prepared successfully through a freeze-thawing process and the dissolution behavior was studied. The results indicated that chitosan can directly dissolve in LiOH/urea aqueous solution. LiOH mainly contributed to the breakage of intramolecular and intermolecular hydrogen bonds in chitosan. Urea, LiOH. and chitosan formed inclusion compound (IQ with urea as the IC host, and the LiOH-chitosan complex as the guest. Aqueous 4.8 wt % LiOH/8.0 wt % urea was verified to be the optimal solvent for chitosan. The results of rheology and viscosity characterizations revealed that chitosan/4.8 wt % LiOH/8.0 wt % urea aqueous solution was pseudoplastic fluid, and was more stable than the solution of chitosan in acetic acid at ambient temperature. (C) 2009 Elsevier Ltd. All rights reserved.
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