Solvent Stokes-Einstein violation in aqueous protein solutions

R. Lamanna, M. Delmelle, and S. Cannistraro
Phys. Rev. E 49, 5878 – Published 1 June 1994
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Abstract

The Stokes-Einstein equation is applied to the water self-diffusion coefficient D in human serum albumin protein solutions. A linear trend for D as a function of T/η is found for all the protein concentrations investigated. However, the indication of a violation of the Stokes-Einstein equation is found in the protein concentration dependence of the effective hydrodynamic radius of water. The deviation of the experimental NMR water self-diffusion and viscosity data from the hydrodynamic Stokes-Einstein relation is found to be consistent with an enhancement of the solvent structure in the vicinity of the protein surface.

  • Received 22 February 1994

DOI:https://doi.org/10.1103/PhysRevE.49.5878

©1994 American Physical Society

Authors & Affiliations

R. Lamanna, M. Delmelle, and S. Cannistraro

  • Unità Istituto Nazionale di Fisica della Materiae, Consiglio Nazionale delle Ricerche, Dipartimento di Fisica dell’Università, I-06100 Perugia, Italy
  • Institut de Physique, Universitè de Liège, B-4000 Sart Tilman Liège, Belgium
  • Dipartimento di Scienze Ambientali, Sezione Chimica e Fisica, Università della Tuscia, I-01100 Viterbo, Italy

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Issue

Vol. 49, Iss. 6 — June 1994

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