Modification of Chitosan Structure by Using Different Alkyl Chains and Studying of Some its Properties

In this paper, the chemical structure of chitosan has been modified by trans esterification reaction with methyl esters both of octanoic and dodecanoic acid, using potassium carbonate as a based catalyst, the degree of substitution has been determinated to change hydrophilic properties, Some physical properties of trans esterification products has been determined by measuring the Kinematic viscosity, degree of turbidity and density of their water solutions.

Study of the thermodynamic properties of some carboxylic acids in a binary mixture of water and (hexane - ethanol - tetrahydrofuran)

This research includes a study of the triple-sentence equilibrium curves consisting of electrolytic acid and apple acid in a binary mixture of water and (hexane, ethanol, tetrahydrofuran)

Synthesis of dodecanoate sodium alginate and study its properties as a carrier of ibuprofen

Tow compounds have been synthesised: tetra butyl ammonium alginate and dodecanoate sodium alginate ester. The synthesis of compound (1) by transferring sodium alginate to Alginic acid and then adjusted by tetra-butyl ammonium hydroxide. The compound (2) was synthesised from tetra-butyl ammonium alginate according to Fisherest erification, between tetra-butylammonium alginate and dodecanoic acid and using (Amberlyst-15) as a hetrogeneous acid catalyst, and then the product react with sodium carbonate.