Relevance of Hydrodynamic Effects for the Calculation of Outer Surface Potential of Biological Membrane Using Electrophoretic Data.
In this paper, we present the results of a study on the influence of hydrodynamic effects on the surface potentials of the erythrocyte membrane, comparing two different models formulated to simulate the electrophoretic movement of a biological cell: the classical Helmholtz-Smoluchowski model and a model presented by Hsu et al. (1996). This model considers hydrodynamic effects to describe the distribution of the fluid velocity. The electric potential equation was obtained from the non-linear Poisson-Boltzmann equation, considering the spatial distribution of electrical charges fixed in glycocalyx and cytoplasmic proteins, as well as electrolyte charges and ones fixed on the surfaces of lipidic bilayer. Our results show that the Helmholtz-Smoluchowski model is not able to reflect the real forces responsible to the electrophoretic behavior of cell, because it does not take account the hydrodynamic effects of glycocalyx. This charged network that covers cellular surface constitutes a complex physical system whose electromechanical characteristics cannot be neglected. Then, supporting the hypothesis of other authors, we suggest that, in electrophoretic motion analyses of cells, the classical model represents a limiting case of models that take into account hydrodynamic effects to describe the velocity distribution of fluid.
Universidade do Estado do Rio de Janeiro, Instituto de Matemática e Estatística, Rua São Francisco Xavier, 524, 6º andar, 20551-900 Rio de Janeiro, RJ, Brasil, Universidade do Estado do Rio de Janeiro, Universidade do Estado do Rio de Janeiro, Instituto de Matemática e Estatística, Rio de Janeiro RJ , Brazil.
Izan M
IM
Silva
Universidade do Estado do Rio de Janeiro, Instituto de Matemática e Estatística, Rua São Francisco Xavier, 524, 6º andar, 20551-900 Rio de Janeiro, RJ, Brasil, Universidade do Estado do Rio de Janeiro, Universidade do Estado do Rio de Janeiro, Instituto de Matemática e Estatística, Rio de Janeiro RJ , Brazil.
Maria Clícia S
MC
Castro
Universidade do Estado do Rio de Janeiro, Instituto de Matemática e Estatística, Rua São Francisco Xavier, 524, 6º andar, 20551-900 Rio de Janeiro, RJ, Brasil, Universidade do Estado do Rio de Janeiro, Universidade do Estado do Rio de Janeiro, Instituto de Matemática e Estatística, Rio de Janeiro RJ , Brazil.
Dilson
D
Silva
Universidade do Estado do Rio de Janeiro, Instituto de Matemática e Estatística, Rua São Francisco Xavier, 524, 6º andar, 20551-900 Rio de Janeiro, RJ, Brasil, Universidade do Estado do Rio de Janeiro, Universidade do Estado do Rio de Janeiro, Instituto de Matemática e Estatística, Rio de Janeiro RJ , Brazil.
Célia M
CM
Cortez
D004586:Electrophoresis; D004910:Erythrocyte Membrane / Q000502:physiology*; D019276:Glycocalyx / Q000502:physiology; D006801:Humans; D057446:Hydrodynamics; D008051:Lipid Bilayers; D008564:Membrane Potentials / Q000502:physiology*; D008954:Models, Biological
D008051:Lipid Bilayers