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Low molecular weight chitosans--preparation by depolymerization with Aspergillus niger pectinase, and characterization.

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Title Low molecular weight chitosans--preparation by depolymerization with Aspergillus niger pectinase, and characterization.
 
Creator Kittur, Farooqahamed S
Vishu Kumar, Acharya B
Tharanathan, R. N.
 
Subject 28 Meat, Fish & Poultry
 
Description The viscosity of a chitosan solution was rapidly lowered in the presence of pectinase from Aspergillus niger at pH 3.0 and 37 degrees C. The low molecular weight chitosans (LMWC) had a molecular weight in the range 20,000-5000 Da. Circular dichroism spectra showed a decrease in the segment of acetylated glucosamine units, whereas X-ray diffraction and CP-MAS 13C NMR indicated higher crystallinity and polymorphism in LMWC. The latter on thermal drying resulted in structural alterations, and yielded an insoluble product. FT-IR and X-ray diffraction showed no evidence of either Schiff's base linkage or any annealed polymorph. CP-MAS 13C NMR showed marked changes in the chain conformations of LMWC, which are believed to be responsible for its loss of solubility and functionality.
 
Date 2003
 
Type Article
PeerReviewed
 
Format application/pdf
 
Language en
 
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Identifier http://ir.cftri.com/2065/1/Carbohydrate_Research_338_%282003%29_1283-1290.pdf
Kittur, Farooqahamed S and Vishu Kumar, Acharya B and Tharanathan, R. N. (2003) Low molecular weight chitosans--preparation by depolymerization with Aspergillus niger pectinase, and characterization. Carbohydrate research, 338 (12). pp. 1283-90. ISSN 0008-6215