Characterization of Gum From Anogeissus Leiocarpus (DC.) Guill. & Perr. (Combretaceae)
Anogeissus leiocarpus gum samples were collected as natural exudates from different locations of gum belt in Sudan, the physicochemical properties of the gum were studied, the solubility of this gum was 14.5% w/v dissolves in water at 25o C to form a clear solution, moisture content range between (6.987% to 8.649% w/w), ash content between (2.00% to 2.05% w/w), pH between (4.39 to 4.65), refractive index between (1.58 to 1.60) , nitrogen between (0.125% to 0.155%), protein between (0.81% to 1.00%), specific optical rotation between (-33.8 to -35.2). The cationic composition was in the order: (Ca++) 4533 ppm has the highest value in all samples followed by (K+) 3520 ppm, (Mg++) 1047 ppm, (Na+) 600 ppm, (Fe++) 562 ppm , (Pb++) 258 ppm, (Zn++) 197 ppm and trace amount of (Mn++) 74.5 ppm, (Cr++) 4.5 ppm. Intrinsic viscosity was 0.115 in NaCl and 0.914 in H2O, reducing sugar as follows; Rhamnose was 9.288%, Aribanose was 34.00%, and Galactose was 27.50%, estimation of equivalent weight was 1384.33 and uronic acid 14.02. The analysis of variance showed insignificant differences (p<0.05) in all properties studied.
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