Influence of dielectric friction and near-surface increase of viscosity on rotational Brownian motion of charged biopolymers in solutions

N. V. Brilliantov, N. G. Vostrikova, V. P. Denisov, Yu M. Petrusievich, O. P. Revokatov

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5 Citations (Scopus)

Abstract

Influence of surface charges of biopolymer macromolecule on its rotational Brownian dynamics in solutions is considered in terms of dielectric friction and electrovisocosity. A mean spherical approximation for electric field of macromolecule is used. It is shown that for irregular surface charges distribution the rotational diffusion coefficient DR depends only on two variables: on the total charge of macromolecule and on the "partial" ionic strength of the solution associated with surface charges. The pH dependence of DR for lyzozyme is calculated and compared with available experimental data. The experimental data agree much better with our theory which has no fitting parameters, than with the ordinary Stokes-Einstein-Debye theory.

Original languageEnglish
Pages (from-to)227-236
Number of pages10
JournalBiophysical Chemistry
Volume46
Issue number3
DOIs
Publication statusPublished - May 1993
Externally publishedYes

Keywords

  • Charged biopolymers
  • Dielectric friction
  • Rotational Brownian motion

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