| 摘要 |
The present invention provides a method for detecting a target substance by detecting the presence or concentration of a target substance in a sample solution by bringing the sample solution into contact with a detecting element including a detecting part and a non-detecting part and detecting the presence or number of a magnetic label (magnetic marker) present in the vicinity of the surface of the detecting part and provides a target-substance detection kit. The surface potential psi1 of the magnetic label in the sample solution, the surface potential psi2 of the detecting parts and the surface potential psi3 of the non-detecting part satisfy any one of the following relationships i) to iv): <?in-line-formulae description="In-line Formulae" end="lead"?>psi1psi3>0 and psi2=0, i)<?in-line-formulae description="In-line Formulae" end="tail"?> <?in-line-formulae description="In-line Formulae" end="lead"?>psi1psi2<0 and psi3=0, ii)<?in-line-formulae description="In-line Formulae" end="tail"?> <?in-line-formulae description="In-line Formulae" end="lead"?>psi1psi2<0, psi2psi3>0, and |psi2|>|psi3|, and iii)<?in-line-formulae description="In-line Formulae" end="tail"?> <?in-line-formulae description="In-line Formulae" end="lead"?>psi1psi2<0 and psi2psi3<0; iv)<?in-line-formulae description="In-line Formulae" end="tail"?> and the target substance borne by the magnetic label is captured by a primary capturing body borne by the detecting part, or the target substance captured by a primary capturing body borne by the detecting part is captured by a secondary capturing body borne by the magnetic label.
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