Adsorption of colloidal hydrous alumina on yeast cells

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Abstract
The adsorption of synthetic colloidal (0.25 µm) spherical hydrous alumina particles on cells of the yeast Saccharomyces cerevisiae(5.7 µm) was studied at very low ionic strength in a stirred system. A kinetic study shows that apparent adsorption equilibrium requires ca. 15 h. The Langmuir-type adsorption isotherm is the same for pH 4, 6 and 8; the plateau corresponds to 75% coverage of the yeast cells by the adhering alumina particles, assuming a close-packed hexagonal array for the complete coverage. The presumed influence, on both the adsorption kinetics and the isotherm, of the aggregation of composite particles, consisting of a collector particle and adsorbed particles, is emphasized.

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