Abstract
Polyvinylpyrrolidone (PVP) alone was scarcely adsorbed to the surface of hydroxyapatite (HAP). However, its amount of adsorption increased with the concentration of sodium dodecylsulfate (SDS) added in an aqueous phase. SDS was adsorbed by HAP through electrostatic attraction between negative charge of its polar head group and positive sites on HAP, while hydrocarbon tail of the adsorbed SDS captured segments of polymer coil of PVP through hydrophobic interaction, resulting in the formation of the surface complex. Surface modification of biological HAP by amphiphilic compounds seemed significant in the formation of animal hard tissues.
