Journal
GREEN CHEMISTRY
Volume 21, Issue 12, Pages 3276-3285Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9gc00304e
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Funding
- Natural Science and Engineering Research Council of Canada (NSERC)
- Canada Foundation for Innovation (CFI)
- Canada Research Chairs (CRC)
- Fonds de Recherche du Quebec - Nature et Technologies (FRQNT) Equipe program
- Centre for Green Chemistry and Catalysis (CGCC), McGill University
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Chitosan can be obtained from the deacetylation of chitin. This process is however difficult and usually accompanied by depolymerization, affording low molecular weight chitosan. We report a novel path, relying on the combination of mechanochemistry and aging, to yield high molecular weight chitosan with minimal use of energy and solvent. This method is versatile and applicable to a number of chitin sources, including crude crustacean and insect shells, yielding deacetylation up to 98% and remarkably high molecular weights. Chitin deacetylation was studied by magic angle spinning nuclear magnetic resonance and molecular weight was estimated by viscometry. This process affords chitosan in a safer fashion and with less materials and energy usage compared to the classic hydrothermal one.
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