Patent ID: 7427393

Claim:
A preparation containing magnetic vesicular particles, wherein the magnetic vesicular particles, each includes at least one magnetic microparticle within a lipid membrane an organic compound having at least two groups selected from the group consisting of a carboxyl group, a carbamoyl group, an amino group, a mercapto group, a sulfo group, and a dithio group is bonded to the magnetic microparticle, and the magnetic vesicular particles satisfy the following equation: 0.05 ≦R /( r× 100)≦1.5 wherein R represents an average grain size of the magnetic vesicular particles and r represents an average particle size of magnetic microparticles included in the magnetic vesicular particles wherein the organic compound is a compound selected from the group consisting of phthalic acid, isophthalic acid, therephthalic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, fumaric acid, maleic acid, 2-mercaptoamine, 6-aminehexanethiol, 2-mercaptopropionic acid, asparagic acid, glutamine, malic acid, oxaloacetic acid, 2-ketoglutaric acid, serine, threonine, cysteine, cysteic acid, cystine, N -acetylcysteine, cysteine ethyl ester, and dithiothreitol.