Abstract
As a further means to unravel the various factors involved in protein adsorption, this paper deals with the determination and the discussion of the enthalpy change resulting from the adsorption of human plasma albumin and bovine pancreas ribonuclease on polystyrene latices. The measurements were made under conditions of plateau-adsorption at various temperatures, electrolyte concentrations, and electrical charges on the adsorbate and the adsorbent. Several factors contribute to the observed enthalpy effect. For example, at high pH, where the protein and the polystyrene surface repel each other electrostatically, spontaneous exothermal adsorption takes place. However, under many other conditions the adsorption proceeds endothermically. This and other considerations lead to the conclusion that the adsorption is, at least in part, entropically driven.
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