| 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 potentialψ1 of the magnetic label in the sample solution, the surface potentialψ2 of the detecting parts and the surface potentialψ3 of the non-detecting part satisfy any one of the following relationships i) to iv): i)ψ1ψ3>0 andψ2=0, ii)ψ1ψ2<0 andψ3=0, iii)ψ1ψ2<0,ψ2ψ3>0, and |ψ2|>|ψ3|, and iv)ψ1ψ2<0 andψ2ψ3<0; 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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