Dilute solution properties and degree of chain branching for dextran

作者：Kasaai Mohammad R^*

来源：Carbohydrate Polymers, 2012, 88(1): 373-381.

DOI：10.1016/j.carbpol.2011.12.012

• Dextran
• Chain branching
• Viscometric constants
• Radius of gyration

Hydrodynamic volume, radius of gyration, and viscometric constants. K and a, for dextran, with a wide molecular weight range were calculated using experimental reported average-molecular weights (M-n, M-w), and intrinsic viscosity, [eta], data in water and 0.05 M Na2SO4. Degree of chain branching for dextran was also determined using different procedures. This study demonstrated that hydrodynamic volume and radius of gyration of a dextran sample with M-w <20 kDa and its linear counterpart with equal M-w are almost identical, whereas the latter parameters for a dextran sample with M-w >20 kDa was smaller than that of its linear counterpart. Values of 0.506 in water and 0.512, 0.425 and 0.273 in 0.05 M Na2SO4 for the exponent a were obtained. A smaller value for a was obtained for a larger M-w range. Molecular weights of desirable nano-particles for various branches of nanotechnology can be estimated from a derived radius of gyration-molecular weight relationship.

• 出版日期2012-3-17