| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a magnetic particle presenting excellent dispersion stability even in pH buffer solution, and to preferably provide a magnetic marker particle presenting sufficient dispersion stability and magnetic collection nature together in practical use in the pH buffer solution. <P>SOLUTION: A magnetic marker particle is constituted by containing a magnetic particle and polymer deposited on the surface of the magnetic particle, in which the polymer is constituted by containing at least two kinds of hydrophilic groups, a first hydrophilic group and a second hydrophilic group, the second hydrophilic group becomes a functional group for forming three-dimensionally bulky structure, and a value V<SB POS="POST">B</SB>of sedimentation rate of the magnetic marker particle to be represented by a formula 1 for buffer solution constituted by containing the magnetic marker particle becomes a range within 1.0×10<SP POS="POST">-3</SP>-6.0. <P>COPYRIGHT: (C)2012,JPO&INPIT |
