Abstract: A drug delivery system and a drug delivery method are provided. The drug delivery system comprises a nanoparticle to which a first functional group is bound and drug is loaded, an antibody to which a second functional group to react with the first functional group is bound, and a carrier cell comprising an antigen protein to bind to the antibody. The drug delivery method comprises injecting a nanoparticle to which a first functional group is bound and drug is loaded, and an antibody to which a second functional group to react with the first functional group is bound into a living body, and binding the antibody to an antigen protein of a carrier cell present in the living body, and binding the nanoparticle to the antibody by reaction of the first functional group and the second functional group.

Abstract: The present invention relates to iron oxide nanocomposite, magnetic resonance imaging T2 contrast medium comprising same, and method for manufacturing same. More particularly, the present invention is directed to An MRI (magnetic resonance imaging) T2 contrast agent, comprising an iron oxide nanocomposite which includes an iron oxide nanoparticle, wherein said iron oxide nanoparticle is encapsulated with a surfactant and said surfactant is encapsulated with polyethylene glycol-phospholipid and method for preparing the same.

Abstract: The invention relates to a magnetic resonance imaging T2 contrast medium (agent) for cell contrasting, and to a method for manufacturing the same. The magnetic resonance imaging T2 contrast agent for imaging at cellular level comprises magnetic nanoparticles exhibiting ferrimagnetism at room temperature, has a very high relaxivity, and has an effective uptake into cells. Thus, the T2 contrast agent may effectively mark various types of cells, and in vitro and in vivo magnetic resonance imaging at the single cell level may he realized.

Abstract: The present invention relates to a magnetic nanocomposite, a process for production thereof, a reusable protein-binding agent for separation of a protein including the magnetic nanocomposite, and a process for selective binding, separation and purification of a protein using the magnetic nanocomposite. In particular, the present invention is directed to a magnetic nanocomposite with a magnetic nanoparticle core of a magnetic nanoparticle, a silica shell coating said core, and a nanoparticle layer of a fourth period transition metal oxide, which coats said silica shell, a process for production of the magnetic nanocomposite, a reusable protein-binding agent the magnetic nanocomposite, and a process for selective binding, separation and purification of a protein using the magnetic nanocomposite.