الفهرس 
IntroductionOnly 14 pages are availabe for public view
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Abstract
Various novel chitosan derivatives to emphasis chitosan solubility and widen its application have been obtained by chemical modification of amino and hydroxyl groups attached to the macromolecule backbone. For instance, N-, O-carboxymethyl-chitosan, Ocarboxymethyl-chitosan, N-carboxymethyl-chitosan, O-succinyl-chitosan [3], hydroxypropylchitosan, ethylamine hydroxyl-chitosan [4],N-trialkyl-chitosan and N-hydroxymethylfurfurylchitosn [5]. The covalent crosslinking of chitosan can be performed with dialdehydes such as glutaraldehyde [6], terphthaldehyde and glyoxal through the reaction with amino group to form imine bond. Other compounds generally used for chitosan crosslinking such as terphthaloyl diisocyanate [7], epoxy compounds, and genibin [8]. In addition, some Schiff bases can be synthesis by condensation of amino group with different aldehydes.