LABELING INORGANIC NANOPARTICLE AGENT

摘要

Disclosed is a labeling inorganic nanoparticle agent which can be used as a labeling agent in the fields of biology and medicine and can emit a fluorescence having a stable luminous intensity. The labeling inorganic nanoparticle agent comprises inorganic nanoparticles each of which has a surface modified with an organic compound, wherein the inorganic nanoparticles have an average diameter of 1 to 10 nm, the organic compound is a compound having a poly(ethylene glycol) chain, the labeling inorganic nanoparticle agent has an average diameter (D) of 8 to 25 nm, and there is a relationship expressed by relational equation (I) between the quantity (M) (mol) of the organic compound per particle of the inorganic nanoparticles and the length (L) (nm) of the organic compound measured on the surface of each of the inorganic nanoparticles. Relational equation (I): (M×1022)×L/D = 1.0 to 4.5