| abstract |
Magnetic marker particles exhibiting excellent dispersion stability even in pH buffer solution, preferably magnetic marker particles exhibiting both practically sufficient dispersion stability and magnetic trapping property in pH buffer solution I will provide a. A magnetic marker particle comprising magnetic particles and a polymer deposited on the surface of the magnetic particle, wherein the polymer has at least two kinds of a first hydrophilic group and a second hydrophilic group. And the second hydrophilic group is a functional group that forms a sterically bulky structure, and the buffer solution containing the magnetic marker particles is represented by Formula 1. Magnetic marker particles, wherein the magnetic marker particles have a sedimentation velocity value V B in the range of 1.0 × 10 −3 to 6.0. [Selection figure] None |