MARKER, IMMUNOASSAY METHOD, IMMUNOASSAY REAGENT, METHOD FOR ASSAYING ANALYTE, KIT FOR ASSAYING ANALYTE, AND TEST STRIP FOR LATERAL FLOW CHROMATOGRAPHY

摘要

A resin-metal composite 100 to be used as a marker in an immunoassay, said resin-metal composite 100 comprising a resin particle 10 and metal particles 20 and having the following constitution (A) or constitution (B): (A) the average particle size of the resin-metal composite exceeding 300nm; or (B) the average particle size of the metal particles being in the range of more than 20nm and less than 70nm . It is preferred that a part of the metal particles 20 are two- or three-dimensionally distributed in the surface layer part 60 of the resin particle 10, a part of the three-dimensionally distributed metal particles 20 are partly exposed to the outside of the resin particle 10, and a part of the remainder particles are enclosed in the resin particle 10.