Physicochemical evolution of the condensation reaction of glycidol with oleic acid in the presence of Ambersep 900-Cl^- resin, (w/o, water/oil; o/w, oil/water; μe, microemulsion). Resin before reaction (hydrophilic resin). Adsorption of oleic acid on resin (hydrophobic resin). Contact of glycidol/water solution with resin (hydrophilic/hydrophobic resin). Resin surrounded by polymorphic system (w/o system, o/w system, or microemulsion system) (Mouloungui et al., 2009).