Abstract
An experimental examination is made of dextran/erythrocyte suspensions with the aim of testing the theory previously proposed for the electrokinetic behavior of these systems. Dextran is shown to adsorb to normal human erythrocytes from simple salt solutions; the amount adsorbed varies linearly with dextran concentration over a wide range. The relative zeta potential, Z, of cells in dextran is found to depend on the species of monovalent counterion present but not the co-ion. The dependence of Z on ionic strength is measured and shown to agree with the theoretical expression derived previously for an appropriate choice of parameters. The parameters so obtained vary in a manner which is anticipated from the characteristics of polymer adsorption in these and other systems. In particular, a direct comparison between the adsorption parameter, obtained by interpreting the electrophoretic results in terms of our theory, and the dextran adsorption measurements provides substantial support for the model over the range of conditions examined.
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