Competitive adsorption of fluorosurfactant and protein to synthetic hydroxyapatite

Abstract

We investigated the competitive adsorption of fluorosurfactants (FSA) and protein to synthetic hydroxyapatite (HAp) by measuring of the zeta potential. When protein was mixed with 1 × 10^-4vol% FSA, the surface tension decreased with increasing protein concentration much in the same way it did when FSA was not present. However, when the FSA was increased to 1 × 10^-2vol%, increasing the protein concentration did not affect surface tension so dramatically. The zeta potential of HAp in mixed solutions was similar to that for protein alone. It was found that the protein dominated the competitive adsorption to HAp in any solution of FSA and protein.