Abstract: The present invention relates to an inhibitor capable of increasing accuracy of the reaction in hybridization, and inhibiting nonspecific hybridization, a clinical diagnostic reagent, and a method of clinical analysis whereby nonspecific hybridization in clinical analysis is inhibited, and a target nucleic substance is detected easily with high accuracy. The inhibitor and the clinical diagnostic reagent contains polymer (H) having a nonspecific hybridization inhibitory action. The polymer has in its molecule at least one of carboxyl and sulfone groups, and phosphorylcholine-like groups, and has a weight average molecular weight of 1000 to 5000000. The method of clinical analysis includes contacting a sample with a test agent capable of hybridizing with a specific nucleic substance in the presence of the inhibitor.

Abstract: Disclosed are an immunoassay device which comprises a labeled substance dotting portion and a specimen dotting portion provided thereon, and an immunoassay method using the device.

Abstract: The present invention provides a chemiluminescence enhancer treated to retain favorable dispersibility of fine solid carriers and stably exert a chemiluminescence enhancing action. The invention provides a chemiluminescence enhancer used for signal detection in a solid phase immunoassay using antigen or/and antibody immobilized onto fine solid carriers dispersible in a liquid medium, consisting of a water soluble macromolecular quaternary ammonium salt, a quaternary sulfonium salt or a quaternary phosphonium salt in order to enhance emission of light caused by an enzymatic reaction of a chemiluminescent substrate having dioxetane, wherein the chemiluminescence enhancer is given an aggregation inhibition treatment of the fine solid carriers by the treatment with an oxidizing agent or a reducing agent, and a chemiluminescence method and a kit using the chemiluminescence enhancer.

Abstract: The present invention provides a chemiluminescence enhancer treated to retain favorable dispersibility of fine solid carriers and stably exert a chemiluminescence enhancing action. The invention provides a chemiluminescence enhancer used for signal detection in a solid phase immunoassay using antigen or/and antibody immobilized onto fine solid carriers dispersible in a liquid medium, consisting of a water soluble macromolecular quaternary ammonium salt, a quaternary sulfonium salt or a quaternary phosphonium salt in order to enhance emission of light caused by an enzymatic reaction of a chemiluminescent substrate having dioxetane, wherein the chemiluminescence enhancer is given an aggregation inhibition treatment of the fine solid carriers by the treatment with an oxidizing agent or a reducing agent, and a chemiluminescence method and a kit using the chemiluminescence enhancer.

Abstract: The present invention provides a chemiluminescence enhancer treated to retain favorable dispersibility of fine solid carriers and stably exert a chemiluminescence enhancing action. The invention provides a chemiluminescence enhancer used for signal detection in a solid phase immunoassay using antigen or/and antibody immobilized onto fine solid carriers dispersible in a liquid medium, consisting of a water soluble macromolecular quaternary ammonium salt, a quaternary sulfonium salt or a quaternary phosphonium salt in order to enhance emission of light caused by an enzymatic reaction of a chemiluminescent substrate having dioxetane, wherein the chemiluminescence enhancer is given an aggregation inhibition treatment of the fine solid carriers by the treatment with an oxidizing agent or a reducing agent, and a chemiluminescence method and a kit using the chemiluminescence enhancer.

Abstract: The present invention relates to an inhibitor capable of increasing accuracy of the reaction in hybridization, and inhibiting nonspecific hybridization, a clinical diagnostic reagent, and a method of clinical analysis whereby nonspecific hybridization in clinical analysis is inhibited, and a target nucleic substance is detected easily with high accuracy. The inhibitor and the clinical diagnostic reagent contains polymer (H) having a nonspecific hybridization inhibitory action. The polymer has in its molecule at least one of carboxyl and sulfone groups, and phosphorylcholine-like groups, and has a weight average molecular weight of 1000 to 5000000. The method of clinical analysis includes contacting a sample with a test agent capable of hybridizing with a specific nucleic substance in the presence of the inhibitor.

Abstract: An immunoassay element for quantitatively analyzing a macromolecular antigen by determining the change in enzymatic activity caused by a reaction between the macromolecular polymer antigen and an enzyme-labelled antibody. The immunoassay element comprises a substrate layer containing a non-diffusible substrate which forms a diffusible material in the presence of the enzyme, and a reagent layer containing a fragmenting enzyme for further fragmenting the diffusible material into a lower molecular weight product. Also provided is a process for quantitatively analyzing a macromolecular antigen in a sample by the use of the immunoassay element.

Abstract: Disclosed are an immunoassay device which comprises a labeled substance dotting portion and a specimen dotting portion provided thereon, and an immunoassay method using the device.

Abstract: Disclosed are an immunoassay device which comprises a labeled substance dotting portion and a specimen dotting portion provided thereon, and an immunoassay method using the device.

Abstract: Disclosed are an immunoassay device which comprises a labeled substance dotting portion and a specimen dotting portion provided thereon, and an immunoassay method using the device.

Abstract: An enzyme-labeled immunoassay is performed by the steps of allowing a test sample to react with an enzyme-labeled reagent, allowing a substrate to react with the enzyme to form a signal, and immobilising the enzyme-labeled reagent, with the prevention of a further signal formation from a predetermined time on after the immobilisation of the enzyme-labeled reagent, using an enzyme inhibitor.

Abstract: Disclosed are a color developing method utilizing the reaction of an indolyl derivative with an enzyme in the presence of a specific free radical compound and/or a specific chelate compound, and an enzyme immunoassay using the color developing method.

Abstract: An enzyme-labeled immunoassay is performed by the steps of allowing a test sample to react with an enzyme-labeled reagent, allowing a substrate to react with the enzyme to form a signal, and immobilising the enzyme-labeled reagent, with the prevention of a further signal formation from a predetermined time on after the immobilisation of the enzyme-labeled reagent, using an enzyme inhibitor.

Abstract: A liquid supply device for transporting a liquid to a predetermined portion includes a liquid container for holding a liquid therein, which has an opening, a sealing sheet member which is impermeable but rupturable and seals the opening of the container, and an absorbent material which is capable of transporting the liquid by capillary action, the absorbent material being disposed on the sealing sheet member, out of contact with the liquid when the sealing sheet member is not ruptured, while when the sealing sheet member is ruptured and the absorbent material is brought into contact with the liquid, part of the absorbent material being continuously held within the liquid and transporting the liquid to the predetermined position. An analytical test device using the above liquid supply device is provided, which may be used, for instance, immunoassay.

Abstract: Disclosed are a color developing method utilizing the reaction of an indolyl derivative with an enzyme in the presence of a specific free radical compound and/or a specific chelate compound, and an enzyme immunoassay using the color developing method.

Abstract: There are disclosed a magnetic particle for an immunoassay method, which comprises a core and a coating layer formed on the surface of the core wherein said core comprises an organic polymer matrix and said coating layer comprises a mixed crystal ferrite represented by the formula:M.sub.x Fe.sub.(3-x) O.sub.4wherein M represents at least one metal selected from the group consisting of Mn, Ni, Zn, Co, Cu, Mg, Sn, Ca and Cd, and x is a number satisfying the relation: 0<x<3,and an antigen or an antibody is bound onto the surface of the coating layer and wherein said particle has a particle size of 0.03 to 10 .mu.m, and an immunoassay method using the same.

Abstract: A dry-type analytical element for immunoassay having at least one water-permeable layer for measuring a ligand in a sample according to enzyme immunoassay, which comprises,(A) a water-soluble macromolecular substrate, and(B) an enzyme conjugated with antibody reacting with the ligand in the sample capable to act on the above water-soluble macromolecular substrate. The above analytical element further comprises,(C) a macromolecular antigen which is a conjugate of the ligand or its derivative with a macromolecular compound in the above water-permeable layer of the above dry-type analytical element.The invention can conduct highly sensitive and simple enzyme immunoassay.

Abstract: An immunoassay element for quantitatively analyzing a ligand by determining the change in enzymatic activity caused by a reaction between the ligand, a linked product of the ligand and a high molecular weight compound and an enzyme-labelled antibody. The immunoassay element comprises a substrate layer containing a non-diffusible substrate which forms a diffusible material in the presence of the enzyme, and a reagent layer containing a fragmenting enzyme for further fragmenting the non-difussible material. Also provided is a process for quantitatively analyzing a ligand contained in a sample by the use of the immunoassay element.

Abstract: An automatic immunoassay apparatus utilizes cartridges each having at least two wells, a first well of said wells containing solid phase material carrying antigen or antibody, a second well of said wells containing antibody or antigen labelled with labelling compound. The wells may be sealed with a suitable sealing film before use and the sealing film is broken when the cartridge is to be used. The cartridges are transported to a predetermined position on a steppingly movable reaction line and conveyed thereby at a predetermined interval. While the reaction line steps, a sample, labelled antigen or antibody contained in the second well and substrate, if necessary, are added to the first well and stirred at predetermined timings and reaction between the sample and a reactive solution is measured under control of a control device having memory means storing operator selectable programs for various measuring methods.

Abstract: An immunoassay method using magnetic particles comprising a core and a coating layer on the surface thereof, The core comprises an organic polymer and the coating layer comprises an iron oxide type ferrite coating layer. An antigen or an antibody is bound onto the surface of the coating layer and the particle has a particle size of 0.2 to 3 .mu.m.