Abstract: AimTo prepare magnetoliposome (MLP) containing dextran-encapsulated magnetite (Fe₃O₄), and to examine its physicochemical properties and its in vivo behavior on ICR mice. Methods Reverse phase evaporation method was used to formulate MLP and the Fe²⁺ concentration was measured by O-phenanthroline method. Then the basic properties of MLP and in vivo distribution were studied with the aid of ³H isotope as biomarker. ResultsThe mean diameter of MLP was 602.5 nm and the final concentration of encapsulated Fe₃O₄ was 88.1 mg·L_-1. Under natural conditions most of the MLP was taken up by spleen after the administration via tail vain, but its uptake was reduced under the magnetic field. There was a great difference in vivo distribution between the left and right lobes of the liver and the left and right kidneys in magnetic fields. ConclusionReverse phase evaporation method was utilized to prepare magnetoliposomes. The formulation was stable and encapsulated high amount of magnetite. The delivery system could be oriented to certain tissues under magnetic field and satisfying magnetic responsiveness was observed.