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Solid state structure of chitosan prepared under different N-deacetylating conditions.

Harish Prashanth, K. V. and Kittur, F. S. and Tharanathan, R. N. (2002) Solid state structure of chitosan prepared under different N-deacetylating conditions. Carbohydrate Polymers, 50 (1). 27-33, 21 ref..

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Abstract

Changes in the crystallinity and polymorphic nature of chitosan, as a function of N-deacetylation of chitin under different conditions were studied. Viscosity average molecular weight suggests a higher degree of polymerization (DP) for chitosan prepared in the presence of thiophenol, as an oxygen scavenger. FT-IR spectra exhibited a progressive weakening of the bands at 1655, 3265 and 3100 cm-1 during N-deacetylation and A1382/A2920 cm-1 ratios of 0.65, 0.56 and 0.46 indicated a higher order structure for chitosan prepared with thiophenol than those prepared under N2 atmosphere or otherwise. The differences in crystallinity indices of chitosans were further substantiated by X-ray diffraction data. Splitting of C1 and C4 signals in CP-MAS 13C NMR spectra suggested the possible occurrence of newer conformational polymorphs. DSC thermograms showed higher thermal stability for chitosan with higher DP.

Item Type: Article
Uncontrolled Keywords: Chitin; Deacetylation; Viscosity; Molecular weight; Polymorphism
Subjects: 600 Technology > 08 Food technology > 28 Meat, Fish & Poultry
Divisions: Dept. of Biochemistry
Depositing User: Somashekar K.S
Date Deposited: 16 Jun 2011 11:54
Last Modified: 28 Dec 2011 09:53
URI: http://ir.cftri.com/id/eprint/6361

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