Abstract: A test strip including: a first site that's a detection site, where a first antibody specifically binding to the substance to be measured is immobilized on a porous carrier; a second site that's a specimen liquid addition site, where a second labeled antibody binding to the substance to be measured and having a recognition site different from that of the first antibody is retained on a porous carrier to be movable; and a third site that is a specimen liquid or developer addition site, where colored microparticles bound with a substance binding to a label substance of the second antibody are retained on a porous carrier to be movable, wherein the second site is provided between the first and the third sites, and the specimen liquid or developer can move, due to capillarity, from the second site to the first and from the third to the first site.

Abstract: A test strip including: a first site that's a detection site, where a first antibody specifically binding to the substance to be measured is immobilized on a porous carrier; a second site that's a specimen liquid addition site, where a second labeled antibody binding to the substance to be measured and having a recognition site different from that of the first antibody is retained on a porous carrier to be movable; and a third site that is a specimen liquid or developer addition site, where colored microparticles bound with a substance binding to a label substance of the second antibody are retained on a porous carrier to be movable, wherein the second site is provided between the first and the third sites, and the specimen liquid or developer can move, due to capillarity, from the second site to the first and from the third to the first site.

Abstract: An immunoassay device capable of assaying amount of an antigen by allowing a labeled antibody to specifically bind to a antigen analyte in a sample and assaying a label of a bound product, an interior of a single device has four regions comprises: (1) a first region where the antigen in the sample reacts with a first antibody that is the labeled antibody capable of specifically binding to the antigen, (2) a second region where first antibody that has not bound to the antigen reacts with a second biotin- or avidin-bound antibody, (3) a third region where, depending on whether the second antibody is biotin-bound antibody or avidin-bound antibody, either avidin or biotin is immobilized by immobilization means so as to be unable to move to the fourth region, and the second antibody is captured by the immobilized avidin or biotin, and (4) a fourth region where the label of the first antibody that has bound to the antigen is detected, being constructed in such a way that a solution can move sequentially through eac

Abstract: The invention is intended to provide a biochip that allows analysis to be simplified by eliminating a washing step, that is small and inexpensive, and that permits fast, reliable analysis, as well as a method of immunological analysis using such a biochip.

Abstract: It is directed to achieve quantitative measurement over a wide concentration range and good repeatability in a test paper for analyzing and measuring the color of a substance to be analyzed with a color developing reagent.

Abstract: A method of enzymatically measuring hydrogen peroxide by developing a color with use of 3-methyl-2-benzothiazolinoehydrazone as a coupler and in combination with an oxidative color developing reagent with peroxidase, and a reagent therefor is described. Catalase is added to the 3-methyl-2-benzothiazolinonehydrazone reagent as a stabilizer and the reaction is carried out in the presence of ethylenediaminetetraacetic acid or an analogue thereof. The color developing reaction may be carried out in neutral or weak alkali conditions. A reagent is described which comprises a buffer, 3-methyl-2-benzothiazolinohydrazone, and catalase.