Interactions of microcapsules with human polymorphonuclear leucocytes.

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Abstract
Two types of microcapsules with different negative surface potentials, poly (1, 4-piperazinediylterephthaloyl) microcapsules containing various concentrations of sodium polystyrene sulfonate solution and hemolysate-loaded polyamide microcapsules of different degrees of carboxylation, were prepared by using an interfacial polymerization technique, and the interactions of these microcapsules with human polymorphonulcear leucocytes (PMNs) were investigated as a function of the surface potential of the microcapsules in the absence and presence of plasma proteins. The rate of oxygen consumption by PMNs was taken as a measure of the interaction. In the absence of plasma proteins, the rate of oxygen consumption by PMNs increased with increasing difference in surface potential between the microcapsules and PMNs. The presence of plasma proteins affected the rate of oxygen consumption, which was dependent on the protein species present and related to the surface potential of the microcapsules. This was interpreted as showing that the surface potential of the microcapsules exerts a great influence on the mode and amount of protein adsorption on the microcapsule surface.

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