Decoloration of chitosan by UV irradiation

Decoloration of chitosan by UV irradiation, which was used to replace a bleaching step during chitosan preparation, was evaluated under four separate treatments (effect of irradiation time, chitosan/water ratio, stirring speed, and UV light source). The optimal decoloration condition was defined as...

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Bibliographic Details
Published in:Carbohydrate polymers 2008-08, Vol.73 (3), p.384-389
Main Authors: Youn, Dal Kyoung, No, Hong Kyoon, Kim, Dong Seog, Prinyawiwatkul, Witoon
Format: Article
Language:English
Subjects:
Applied sciences
Chitosan
Color
Decoloration
decolorization
duration
Exact sciences and technology
Grafting and modifications
irradiation
Physicochemistry of polymers
Polymers and radiations
ultraviolet radiation
UV irradiation
Viscosity
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Summary:Decoloration of chitosan by UV irradiation, which was used to replace a bleaching step during chitosan preparation, was evaluated under four separate treatments (effect of irradiation time, chitosan/water ratio, stirring speed, and UV light source). The optimal decoloration condition was defined as that producing white chitosan with higher viscosity. Decoloration of chitosan could be achieved effectively using a UV-C light by stirring unbleached chitosan in water (1:8, w/v) for 5 min at 120 rpm. UV irradiation applied under the optimal conditions could be used to produce chitosan with desirable white color ( L ∗ = 76.95, a ∗ = −0.37, and b ∗ = 14.04) and high viscosity (1301.7 mPa s at 0.5% w/v in 1.0% v/v acetic acid).
ISSN:0144-8617
1879-1344
DOI:10.1016/j.carbpol.2007.12.003