Abstract
A series of bile acids/salts acting as surfactants in vertebrate living bodies have been studied in regard to their colloid-and-interfacial properties of their aqueous systems such as surface activity, micelle, polymer-like aggregate or gel formation, solubilization or emulsification, adsorption at air/water and/or at water/solid interfaces etc, which are exhibited by the respective single species and their mixed systems. Of these properties, the aggregation behavior of the respective species which depends on species itself and given conditions such as pH, added salt concentration and temperature is overviewed in this article primarily according to the past work done by the present author and his coworkers.
