Chemistry (Track)


Younes Moussaoui, Najib Mnasri, Elimame Elaloui, Tarik Chafik

Science Faculty of Gafsa, Tunisia


Chitosan, a β-(1,4)-linked polysaccharide of D-glucosamine, is a deacetylated form of chitin, the second most abundant natural polymer in the word. Derived from exoskeleton of insects, crustaceans (shells of crobs, shrimps) and fungi. The notable properties of chitin and its deacetylated form, chitosan, include excellent biocompatibility, admirable biodegradability and low toxicity which provide ample opportunities for this polymer to further development. It has become of great interest not only as a by product resource but also as a new functional biomaterial in various fields such as wastewater treatment, food, agriculture, cosmetic core and biotechnological and pharmaceutical industries.

We have studied the interaction between chitosan (CH-112, AD = 2.9% and CH-111, AD = 13%) and activated carbon to elaborate composite gels to heal injuries. Chitosan has been used for its healing characteristics and activated carbon has been used for its powerful impact of had smells and humidity coming from injuries.

The capacity of adsorption of the chitosan-112 on the activated carbon is of 330mg.g-1 whereas it is of 75mg.g-1 for the chitosan-111. This is explained by the difference of the acetylation degree. Chitosan-112 presents the most amine groups. In acidic solution, these groups are transformed in ammonium ion. Consequently, chitosan-112 is more adsorbed on the negative sites of the activated carbon surface. In the same way, the adsorption of the chitosan-112 on sterilized activated carbon remains unchanged. That means that sterilization by gamma ray did not modify total surface but rather the chemistry of the surface of the activated carbon. In addition, the adsorption capacity of the chitosan-112 on activated carbon increases with the temperature.

Keywords: Chitosan, Actvated carbon, adsorption, composite gel, heal injuries.