OPTIMIZED CHITOSAN REACETYLATION

The present invention relates to a method for the preparation of chitosan of a degree of acetylation DAr, from chitosan having a degree of acetylation DAi lower than DAr, comprising at least one step of purification and at least one step of acetylation of said chitosan , said purification step compr...

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Bibliographische Detailangaben
Hauptverfasser:	FRANCOIS SEBASTIEN, GUERIN MURIEL, LADET SEBASTIEN
Format:	Patent
Sprache:	eng
Schlagworte:	CHEMISTRY COMPOSITIONS BASED THEREON DERIVATIVES THEREOF METALLURGY ORGANIC MACROMOLECULAR COMPOUNDS POLYSACCHARIDES THEIR PREPARATION OR CHEMICAL WORKING-UP
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Beschreibung
Zusammenfassung:	The present invention relates to a method for the preparation of chitosan of a degree of acetylation DAr, from chitosan having a degree of acetylation DAi lower than DAr, comprising at least one step of purification and at least one step of acetylation of said chitosan , said purification step comprising at least one step of solubilization of said chitosan in an acidic aqueous medium and at least one step of precipitation of said thus solubilized chitosan, wherein said acetylation step is carried out in a solution on said solubilized chitosan before said precipitation step.