Physicochemical Characterization of Thermally Treated Chitosans and Chitosans Obtained by Alkaline Deacetylation
Joint Authors
de Oliveira, Ana Maria
de Oliveira Junior, Enio Nazaré
Franco, Telma Teixeira
Source
International Journal of Polymer Science
Issue
Vol. 2014, Issue 2014 (31 Dec. 2014), pp.1-9, 9 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2014-07-22
Country of Publication
Egypt
No. of Pages
9
Main Subjects
Abstract EN
The thermal depolymerization of chitosan and alkaline deacetylation of chitin were characterized by measurement of viscosity, gel permeation chromatography (GPC), potentiometric titration (PT), and proton nuclear magnetic resonance spectroscopy ( H 1 NMR).
The depolymerization rates (DR) measured by kinematic viscosity (KV), apparent viscosity (AV), and GPC (Mw) until 4 h of treatment were DR KV = 21.9 , DR AV = 25.5 , and D R M w = 23.3 % h - 1 and for 5 to 10 h of treatment they decreased slowly to produce of D R KV = 0.545 , D R AV = 0.248 , and DR Mw = 1.11 % h - 1 .
The mole fraction of N-acetylglucosamine residues F A of chitosans was not modified after 10 h of thermal treatment at 100°C.
The initial F A values of chitosan without any treatment were F APT = 0.21 and F A HNMR 1 = 0.22 and of chitosan treated for 10 h were F APT = 0.27 and F A HNMR 1 = 0.22 .
The variables used to characterize the depolymerization process showed a good correlation.
Six hours of thermal treatment as sufficient to obtain chitosans with a molar mass 90% smaller than that of the control chitosan without treatment.
American Psychological Association (APA)
de Oliveira, Ana Maria& Franco, Telma Teixeira& de Oliveira Junior, Enio Nazaré. 2014. Physicochemical Characterization of Thermally Treated Chitosans and Chitosans Obtained by Alkaline Deacetylation. International Journal of Polymer Science،Vol. 2014, no. 2014, pp.1-9.
https://search.emarefa.net/detail/BIM-1037584
Modern Language Association (MLA)
de Oliveira, Ana Maria…[et al.]. Physicochemical Characterization of Thermally Treated Chitosans and Chitosans Obtained by Alkaline Deacetylation. International Journal of Polymer Science No. 2014 (2014), pp.1-9.
https://search.emarefa.net/detail/BIM-1037584
American Medical Association (AMA)
de Oliveira, Ana Maria& Franco, Telma Teixeira& de Oliveira Junior, Enio Nazaré. Physicochemical Characterization of Thermally Treated Chitosans and Chitosans Obtained by Alkaline Deacetylation. International Journal of Polymer Science. 2014. Vol. 2014, no. 2014, pp.1-9.
https://search.emarefa.net/detail/BIM-1037584
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1037584