Abstract
Intrinsic viscosity of macromolecular solutions has become a very useful tool in evaluating high polymeric substances for various industrial applications. The shape characteristics of cottonseed globulin molecules in solution as determined by viscosity data are important in adapting the globulin for use in making synthetic fibers or adhesives and in evaluating chemical and physical modification of the globulin. These characteristics of cottonseed globulin (18.06% nitrogen), extracted from solvent-extracted cottonseed meal by means of 0.5 M sodium chloride solution, precipitated by dialysis, and lyophilized, are reported. The intrinsic viscosity of the globulin in urea solutions was calculated to be 0.093, equivalent to a viscosity increment of 12.3 and an axial ratio (Simha equation) of 9.4 assuming elongated macromolecules or of 16.3 assuming flattened-disc-type macromolecules. These values are comparable with reported axial ratios of other vegetable protein macromolecules.
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