Study of amphotericin B magnetic liposomes for brain targeting.

This study aims to prepare amphotericin B magnetic liposomes (AmB-MLPs), which may improve drug concentration in brain, enhance magnetic targeting for brain and reduce drug toxicity in the presence of magnetic field. AmB-MLPs were prepared by means of film dispersion–ultrasonication, and their physical properties were characterized. In vivo, the magnetic targeting for brain by carotid artery administration was investigated. The particle size of AmB-MLPs was 240±11nm, the encapsulation efficiency was 79.32±2.03%, and the saturation magnetization was 32.54memug−1 at room temperature, which had good magnetic responsiveness. The group of AmB injection was delivered by carotid artery, nevertheless they all died after 20min. AmB-MLPs were injected by carotid artery, and the drug concentration in brain tissue was obviously increased in presence of magnetic field than that of in absence of magnetic field (P<0.05). The Prussian blue staining in brain of SD rats showed that the density of blue staining-positive particles in brain tissue of applying magnetic field group was higher than that of non magnetic field group. These results suggested that AmB-MLPs could reinforce brain targeting and reduce drug toxicity when they were injected by carotid artery under the effect of magnetic field.