Binding Mechanism of Triton X-100 and Triton N to the Surface of Hydroxyapatite in an Aqueous Phase

Abstract

Water-insoluble dodecylphosphate (DP) was solubilized by a micelle of a nonionic surfactant such as Triton X-100(TX) and Triton N (TN) , f orming a mixed micelle. The mixed micelle was adsorbed by HAP after isomorphous substitution of phosphate group of DP for orthophosphate ion on HAP and electrostatic attractive force between a negative charge of DP and Ca2+ on HAP. As a result, nonadsorbable nonionic surfactant was adsorbed indirectly to HAP together with DP forming hemi-and/or admicelle. In an aqueous solution of CaCl2 , the solution of nonionic surfactant-DP became turbid. DP was selectively captured by Ca2+ , resulting in formation of the Ca-DP precipitate, which was separated from the mixed micelle. However, nonionic surfactant remained in an aqueous phase. Thus, the mixed micelle showed different behavior on the surface of HAP and in an aqueous phase .

Solubility of Monoalkyl Phophate in Water in the Presence of Arginine and Triton, and Solubilization of Methyl Yellow Through the Mixed Micelle

“…There are some literatures 4 -7 by other researchers also discussing the effects of alkyl chains of MAP on the crystal formation and surface modification of HAP by means of various techniques. Oda et al 8 studied the adsorption mechanism of nonionic surfactants, Triton-X (TX) and -N (TN), on HAP in the presence and absence of MAP and Arg in an aqueous phase. Although these Tritons are inherently non-adsorbable to the surface, they became adsorbable after forming the mixed micelle together with a MAP.…”