Chitosan is deacetylated form of chitin. Deacetylation is commonly achieved through alkali treatment. Chitosan has got wide range of applications.

* Treat the chitin at 95oC to 100oC with hot sodium hydroxide solution approximately for 90 minutes.

* Wash the residue repeatedly with potable water to make free from alkali.

* Dry the residue either under sunlight or in a mechanical drier to get chitosan in dried form.