Effect of ultrasonic treatment on the biochemphysical properties of chitosan

Four chitosans with different molecular weights and degrees of deacetylation degree and 28 chitosans derived from these initial chitosans by ultrasonic degradation have been characterized by gel permeation chromatography (GPC), FT-IR spectroscopy, X-ray diffraction and titrimetric analyses. Antimicr...

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Bibliographic Details
Published in:Carbohydrate polymers 2006-06, Vol.64 (4), p.553-559
Main Authors: Liu, Hui, Bao, Jianguo, Du, Yumin, Zhou, Xuan, Kennedy, John F.
Format: Article
Language:English
Subjects:
Antimicrobial activity
antimicrobial properties
Applied sciences
Chitosan
Deacetylation degree
Escherichia coli
Exact sciences and technology
Molecular weight
Natural polymers
physicochemical properties
Physicochemistry of polymers
Starch and polysaccharides
Ultrasonic
ultrasonic treatment
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Summary:Four chitosans with different molecular weights and degrees of deacetylation degree and 28 chitosans derived from these initial chitosans by ultrasonic degradation have been characterized by gel permeation chromatography (GPC), FT-IR spectroscopy, X-ray diffraction and titrimetric analyses. Antimicrobial activities were investigated against E. coli and S. aureus using an inhibitory rate technique. The results showed that ultrasonic treatment decreased the molecular weight of chitosan, and that chitosan with higher molecular weight and higher DD was more easily degraded. The polydispersity decreased with ultrasonic treatment time, which was in linear relationship with the decrease of molecular weight. Ultrasonic degradation changed the DD of initial chitosan with a lower DD (90%). The increased crystallinity of ultrasonically treated chitosan indicated that ultrasonic treatment changed the physical structure of chitosan, mainly due to the decrease of molecular weight. Ultrasonic treatment enhanced the antimicrobial activity of chitosan, mainly due to the decrease of molecular weight.
ISSN:0144-8617
1879-1344
DOI:10.1016/j.carbpol.2005.11.007