| abstract |
PROBLEM TO BE SOLVED: To provide metal colloid particles having higher sensitivity than gold colloid particles and suitable as a labeling agent for immunoassay and a protein stain. SOLUTION: After reducing chloroauric acid in a solvent to generate colloidal gold particles, reducing chloroplatinic acid in the presence of the colloidal gold particles, platinum is supported on the surface of the colloidal gold particles. An immunoassay and a measurement kit using the metal colloid particles thus obtained, and an antibody or antigen labeled with the metal colloid. |