Maro Publications

Chitosan

Notes

Patent Abstracts

Patent Titles

*10/30/2013 
from 8/17/2013

Maro Encyclopedia

Biopolymers

Chitin

Renewable Materials

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Patent Titles

10/22/2013

6. 8,563,702 
Composite fibre of alginate and chitosan 

5. 8,562,809 
Chitosan-coated wires for biosensing 

4. 8,562,731 
Fungal modified chitosan adhesives and wood composites made from the adhesives 

10/8/2013

3. 8,552,164 
Spray-dried chitin nanofibrils, method for production and uses thereof 

8/13/2013   

2. 8,507,563 
Pseudo-thermosetting neutralized chitosan composition forming a hydrogel and a process for producing the same

1. 8,506,972 
Highly biocompatible dual thermogelling chitosan/glucosamine salt compositions 

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Notes

“Chitosan /ˈkaɪtɵsæn/ is a linear polysaccharide composed of randomly distributed β-(1-4)-linked D-glucosamine (deacetylated unit) and N-acetyl-D-glucosamine (acetylated unit). It is made by treating shrimp and other crustacean shells with the alkali sodium hydroxide.

 Chitosan has a number of commercial and possible biomedical uses. It can be used in agriculture as a seed treatment and biopesticide, helping plants to fight off fungal infections. In winemaking it can be used as a fining agent, also helping to prevent spoilage. In industry, it can be used in a self-healing polyurethane paint coating. In medicine, it may be useful in bandages to reduce bleeding and as an antibacterial agent; it can also be used to help deliver drugs through the skin.

More controversially, chitosan has been asserted to have use in limiting fat absorption, which would make it useful for dieting, but there is evidence against this.

Other uses of chitosan that have been researched include use as a soluble dietary fiber.

Chitosan is produced commercially by deacetylation of chitin, which is the structural element in the exoskeleton of crustaceans (such as crabs and shrimp) and cell walls of fungi. The degree of deacetylation (%DD) can be determined by NMR spectroscopy, and the %DD in commercial chitosans ranges from 60 to 100%. On average, the molecular weight of commercially produced chitosan is between 3800 and 20,000 Daltons. A common method for the synthesis of chitosan is the deacetylation of chitin using sodium hydroxide in excess as a reagent and water as a solvent. This reaction pathway, when allowed to go to completion (complete deacetylation) yields up to 98% product.

(Chitosan, Wikipedia, 8/19/2013)

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Patent Abstracts

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Interested!!
Bookmark this page to follow future developments!.
(RDC 7/16/2012)

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Roger D. Corneliussen
Editor
www.maropolymeronline.com

Maro Polymer Links
Tel: 610 363 9920
Fax: 610 363 9921
E-Mail: cornelrd@bee.net  

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Copyright 2013 by Roger D. Corneliussen.
No part of this transmission is to be duplicated in any manner or forwarded by electronic mail without the express written permission of Roger D. Corneliussen
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* Date of latest addition; date of first entry is 8/17/2013.