A theory for measuring weight average diffusion coefficients from ultracentrifuge experiments

Diffusion coefficients of cellodextrin alditols from DP 1 to 5 in 0.32 molar NaOH are found to be 22% less than in water. Slightly lower diffusion rates and higher friction coefficients and Einstein–Stokes hydrodynamic radii are also reported for the alditols as compared to cellodextrins in water. Considered as ellipsoids based on diffusion rates, the length‐to‐width ratio for the alditols, only slightly greater than for the cellodextrins in water, increase by about 100% in alkali. A similar increase in axial ratio is shown for cellodextrins in the highly alkaline solvent cadoxene as for the alditols in alkali. It is suggested that creation of the large frictional envelope occurs in alkali prior to complexing with the common cellulose solvents in which complexing with copper, cadmium, and iron in divalent from are involved. The possible nature of the enlarged frictional domain is discussed.

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A theory for measuring weight average diffusion coefficients from ultracentrifuge experiments

Cited by 8 publications

References 4 publications

Pharmaceutical Sciences—1963. Part I.

Pharmaceutical Sciences—1963. Part I.

Ultracentrifuge study of a critically branched polycondensate

The hydrodynamic properties of the cellodextrin alditols

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