Physiochemical and Thermodynamic Study of Anogeissus Leiocarpus Gum‫‬

Abstract

Physiochemical and thermodynamic properties of a composite sample of Anogeissus Leiocapus gum were studied using standerd methods. The average values of a diferent Characterization methods were determined to obtain the mean values of: moisture, ash, nitrogen and protein, specific rotation, intrinsic viscosity, refractive index, ph of The gum. The results of this characterization as the mean values of all proprieties as follows : 10.7 %, 2.6 %, 0.7, 4.5, - 43.8, 0.43, 1.333, 5.00 respectively. cationic composition of gum sample was also determined for eight elements: potassium (K), Calcium (Ca), Magnesium (mg), Copper (Cu), Sodium (Na), Zinc (Zn), Irion (Fe) and Lead (pb). The results is: 494.4, 356.7, 285.7, 95.5, 50.5, 8.5, 4.9, 0.3 respectively. The solubility of Anogeissus leiocarpus gum in water was determined and found to be 65.5 % . molecular weight of polymer by osmotic pressure was found to be 6.82746 × 10 5 Da. The thermodynamic properties of the gum solution (partial specific volume of gum sample and the solvent (water), volume fraction of both, and density of solid) was studied and the values was found to be: 0.7, 1.001, 0.41, 0.59, 0.881 respectively. The changes in Chemical potential of gum sample in a diferent concentration of gum solution was calculated and were 3‫‪found‬‬ ‫‪to‬‬ ‫‪be‬‬ ‫‪in‬‬ ‫‪the‬‬ ‫‪range‬‬ ‫(‬ ‫‪-0.84‬‬ ‫‪to‬‬ ‫×‪-7.47‬‬ ‫‪10‬‬ ‫‪-3‬‬ ‫‪Jg‬‬ ‫‪-1‬‬ ‫‪).‬‬ ‫‪The‬‬ ‫‪in‬‬ ‫‪the‬‬ ‫‪range‬‬ ‫‪(-0.74‬‬ ‫‪to‬‬ ‫‪-4.33×10‬‬ ‫‪-2‬‬ ‫‪Jg‬‬ ‫‪-1‬‬ ‫‪).‬‬