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Synthesis of high molecular weight chitosan from chitin by mechanochemistry and aging

Abstract : 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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https://hal-u-picardie.archives-ouvertes.fr/hal-03613127
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Soumis le : vendredi 18 mars 2022 - 11:30:52
Dernière modification le : samedi 19 mars 2022 - 03:39:49

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Thomas Di Nardo, Caroline Hadad, Albert Nguyen van Nhien, Audrey Moores. Synthesis of high molecular weight chitosan from chitin by mechanochemistry and aging. Green Chemistry, Royal Society of Chemistry, 2019, 21 (12), pp.3276-3285. ⟨10.1039/c9gc00304e⟩. ⟨hal-03613127⟩

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