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Effect of ionic strength on the diffusion coefficient of chondroitin sulfate and heparin measured by quasielastic light scattering

โœ Scribed by P. Tivant; P. Turq; M. Drifford; H. Magdelenat; R. Menez

Publisher
Wiley (John Wiley & Sons)
Year
1983
Tongue
English
Weight
1000 KB
Volume
22
Category
Article
ISSN
0006-3525

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โœฆ Synopsis

Abstract

The normal modes for a mixture of charged macromolecules and electrolyte solution are calculated. We derive a generalized Debye relaxation time and the apparent diffusion coefficient of the macroion, which is shown to increase from its Stokes value, obtained in excess of added salt, with decreasing ionic strength. We test our result with experimental data for macromolecules with different charge densities: heparin and chondroitin sulfate. Besides, we show for this latter molecule that while the diffusion coefficient is increased, the scattered intensity is decreased but not by the same factor. Our results are compared with other theories developed in quasielastic light scattering.

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