chitosan

chitosan

Chitosan is commercially produced from chitin by alkali deacetylation. It is biocompatible, biodegradable and non-toxic, so that it can be used in medical applications such as antimicrobial and wound healing biomaterials. It also used as chelating agent due to its ability to bind with cholesterol, fats, proteins and metal ions.
Chitosan possesses antibacterial and antifungal properties and has been extensively studied as a potential natural antimicrobial agent in the pharmaceutical, cosmetic, agricultural, and food industries. The antimicrobial properties of chitosan are affected by molecular weight, degree of acetylation, and pH.

The haemostatic activity of chitosan can also be related to the presence of positive charges on chitosan backbone. Due to its positive charges, chitosan can also interact with the negative part of cells membrane, which can lead to reorganization and an opening of the tight junction proteins, explaining the permeation enhancing property of this polysaccharide.

Due to chitosan’s many attractive properties such as biodegradability, natural origin, abundance, reactivity, etc., it has many areas of application including medical, agricultural, food processing, nutritional enhancement, cosmetics, and waste and water treatment.

Chemical structure chitosan

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Chitosan is composed of repeating units of chitin, represented by the chemical formula C6H11NO4. Chitin is a natural mucopolysaccharide that is abundantly found in the exoskeleton of arthropods such as shrimp and crab and the cuticle of insects. Chitosan is obtained from the deacetylation of chitin, so that by adding concentrated sodium hydroxide solution and heat, the acetylamine groups in chitin are converted to amine agents.

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