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Decolorization of Chitosan

Published online by Cambridge University Press:  15 February 2011

G. Graham Allan  and
Mutombo Muvundamina
G. Graham Allan
Affiliation:
University of Washington, Department of Chemical Engineering and College of Forest Resources, Seattle, WA 98195.
Mutombo Muvundamina
Affiliation:
University of Washington, Department of Chemical Engineering and College of Forest Resources, Seattle, WA 98195.
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Abstract

The industrial process for extracting chitosan from low cost shellfish waste is well known. It comprises three basic steps: deproteinization, demineralization of the shells to yield chitin, followed by deacetylation of chitin to produce chitosan. However, the product obtained from the process often still contains many impurities. In general, these encompass minerals and carotenoids bonded to chitosan. The treatment of chitosan flakes with aqueous solutions of inorganic polybasic acids permits the removal of the impurities mentioned above. This paper describes an engineering-type procedure which develops a pure, colorless material having a controlled molecular weight.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 218: Symposium V – Materials Synthesis Based on Biological Processes , 1990 , 265
Copyright
Copyright © Materials Research Society 1991

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