“…Nowadays, its application has been extended to monitor local concentrations of drugs and metabolites in different organs and biological fluids, such as muscle, liver, bile, kidney, blood, skin, tumor and lung in animals and humans [17]. The in vitro microdialysis sampling has been used to determine protein binding of drugs [19,20], partition coefficient [21] and to sample dissolution testing of pharmaceutical formulations [22,23]. Up to now, this technique has not been proposed for studying colloidal systems physicochemical characteristics.…”