Abstract: Disclosed are a method and a reagent for quantifying HDL3 in a test sample without requiring laborious operations. The method for quantifying cholesterol in high-density lipoprotein 3 comprises reacting a test sample with one or more surfactants which react specifically with high-density lipoprotein 3, and quantifying cholesterol. When one surfactant is used, the surfactant is one selected from the group consisting of polyoxyethylene polycyclic phenyl ethers having an HLB of 12.5 to 15. When two or more surfactants are used, at least one of the surfactants is at least one selected from the group consisting of polyoxyethylene polycyclic phenyl ethers, and the two or more surfactants are combined so as to provide the total HLB of 12.5 to 15 of the combined surfactants.

Abstract: The object of the present invention is to provide insoluble carrier particles used for high-sensitivity rapid immunoassay, which allow visual observation and high-sensitivity apparatus measurement. The insoluble carrier particles are visible colored insoluble carrier particles labeled with a fluorescent dye, which are used for immunoassay, wherein absorption of fluorescence by the visible colored insoluble carrier particles is low within a wavelength range of fluorescence emitted by the fluorescent dye.

Abstract: The present invention provides a test kit capable of rapid and highly sensitive detection.

Abstract: Object: To provide a test reagent for the analyte in a test sample, utilizing the level of agglutination of a particle suspension which suspend insoluble carrier particles carrying a substance for capturing the analyte as an indicator, which reagent does not undergo self-agglutination during storage, and which non-specific agglutination rarely occurs during measurement, as well as to provide a method for the analyte to be measured in a test sample. Means for Solution: The test reagent for the analyte comprises at least a Solution A which is a buffer solution having an electric conductivity of not less than 30 ms/cm; and a Solution B having an electric conductivity of not more than 6.5 ms/cm, the Solution B being a particle suspension which suspends particles which are insoluble carrier particles carrying a substance for capturing the analyte.

Abstract: An anti-human-norovirus GII antibody which responds to substantially all genotypes of the human noroviruses belonging to GII and which can comprehensively detect such human noroviruses GII. The anti-human-norovirus GII antibody that binds to at least one of epitopes which are contained in amino acid regions represented by the following formulas (1) and (2): P-X1-X2-P-G-E??(1) (SEQ ID NO: 2) X3-X4-X5-F-Y-X6-L-X7-P-X8??(2) (SEQ ID NO: 3) (wherein, X1 represents L, V, N, T, S, M, or R; X2 represents F, Y, or M; X3 represents V or G; X4 represents N or S; X5 represents Q, P, or S; X6 represents S, T, or I; X7 represents A or S; and X8 represents M or V), and of an epitope formed of amino acid 483 of the amino acid sequence represented by SEQ ID NO: 1, or an epitope formed of an amino acid corresponding to amino acid 483, the regions and the amino acids being present in the P domain of a capsid structural protein of a human norovirus GII.

Abstract: The object of the present invention is to provide a method for estimating the glomerular renal function in a convenient and non-invasive manner. As a result of intensive studies to achieve the above object, the present inventors found that there is a high correlation between the urinary megalin excretion rate and the estimated glomerular filtration rate (eGFR) in renal disease patients, and the glomerular filtration rate (GFR) can be estimated with high probability in a non-invasive manner by measuring the megalin level in the urine. This has led to the completion of the present invention.

Abstract: The problem to be solved is accurately and specifically detecting a target substance by suppressing the action of an immunoassay inhibitory substance contained in a specimen derived from a biological mucous membrane. A false negative can be suppressed by treating a specimen with a specimen treatment solution containing a compound having two or more sulfate groups in immunoassay for analyzing a target substance in a specimen derived from a biological mucous membrane.

Abstract: An object of the present invention is to provide a method for increasing the sensitivity of an immunoassay system. In order to achieve the object, the present inventors have discovered that the sensitivity of an immunoassay system can be increased by pretreating urine and thus have completed the present invention.

Abstract: A method that enables quantification of cholesterol in high-density lipoprotein 3 (HDL3) in a test sample without requiring a laborious operation is disclosed. The method for quantifying cholesterol in HDL3 comprises reacting, with a test sample, a surfactant that specifically reacts with high-density lipoprotein 3, and quantifying cholesterol. The method enables specific quantification of HDL3 cholesterol in a test sample using an automatic analyzer without requirement of a laborious operation such as ultracentrifugation or pretreatment. Further, quantification of the HDL2 cholesterol level can also be carried out by subtracting the HDL3 cholesterol level from the total HDL cholesterol level obtained by a conventional method for quantifying the total HDL cholesterol in a test sample.

Abstract: This invention provides a method for separately or simultaneously quantifying cholesterol in a total amount of HDL-C, cholesterol in an HDL subfraction of apoE-containing HDL-C, and cholesterol in an HDL subfraction of apoE-deficient HDL-C. The method comprises enzymatically and separately quantifying cholesterol in apoE-containing HDL and cholesterol in apoE-deficient HDL by adding a surfactant selected from the group consisting of a surfactant with an apoE-containing HDL response rate/apoE-deficient HDL response rate ratio of 0.7 to less than 1.3, a surfactant with an apoE-containing HDL response rate/apoE-deficient HDL response rate ratio of less than 0.7, and a surfactant with an apoE-containing HDL response rate/apoE-deficient HDL response rate ratio of 1.3 or more to a test sample, allowing cholesterol esterase and cholesterol oxidase to react therewith, and quantifying the hydrogen peroxide generated.

Abstract: Disclosed is a novel method for measuring haemagglutinin of an influenza virus, which can construct an assay system in a shorter period of time than a sandwich immunoassay method using two kinds of anti-haemagglutinin antibodies. The method for measuring haemagglutinin of an influenza virus is achieved by a sandwich immunoassay method comprising sandwiching the haemagglutinin between a lectin which binds to the haemagglutinin but does not bind to an antibody, and an anti-haemagglutinin antibody which undergoes antigen-antibody reaction with the haemagglutinin.

Abstract: [Problems] An object of the present invention is to provide a novel method which can expand the measurement range in an immunoassay method. [Means for Solution] The immunoassay method according to the present invention comprises allowing a polyoxyethylene alkyl ether sulfate and a polyoxyethylene sorbitan fatty acid ester to coexist in a reaction system. [Effects] According to the method of the present invention, variation (standard deviation) in blank measurement values in particular can be reduced, so that measurement values are stabilized. By this, a significant difference can be obtained in measurement values even in a low-concentration range where conventional immunoassay methods have difficulty in performing measurements; therefore, the measurement accuracy in such low-concentration range can be improved.

Abstract: Disclosed is a method by which the adsorption of cystatin C to a container can be inhibited in a simple manner to improve the accuracy of the measurement of cystatin C. Provided are: a cystatin C adsorption inhibitor comprising a non-ionic surfactant; a cystatin C measurement reagent comprising the adsorption inhibitor; and a cystatin C measurement kit. Also provided is a method of inhibiting the adsorption of cystatin C, the method comprising bringing a cystatin C-containing sample into contact with a measurement instrument in the presence of a non-ionic surfactant. The aforementioned non-ionic surfactant is preferably a polyoxyethylene-type surfactant. Alternatively, the aforementioned non-ionic surfactant has preferably a phenoxy structure, more preferably a benzylphenoxy structure.

Abstract: Disclosed is a method for selectively eliminating triglycerides in lipoproteins other than low density lipoprotein, which method allows one to provide a method for directly and differentially quantifying LDL-TG in a sample with excellent simplicity, specificity and accuracy using an automated analyzer or the like without performing a laborious operation of pretreatment such as centrifugation or electrophoresis. The method for eliminating triglycerides in lipoproteins other than low density lipoproteins includes allowing lipoprotein lipase, cholesterol esterase, glycerol kinase and glycerol-3-phosphate oxidase to act on a sample in the presence of a surfactant that acts on lipoproteins other than low density lipoprotein and/or a surfactant having LDL-protecting action, and eliminating hydrogen peroxide produced thereby.

Abstract: Disclosed are an immunoassay method which can measure an antigen with high sensitivity and accuracy; and a reagent therefor. In the immunoassay method, an antigen-antibody reaction and/or a measurement is(are) carried out in the presence of a polycarboxylic acid type surfactant. The immunoassay reagent for use in the method is characterized by comprising the polycarboxylic acid type surfactant. By employing such a simple means that the polycarboxylic acid type surfactant is allowed to be present in the reaction and/or measurement system, non-specific reactions can be suppressed effectively even in a highly sensitive immunoassay, and an antigen can be measured accurately and specificity can be improved in the immunoassay.

Abstract: Provided is a method for separately or simultaneously quantifying whole HDL-C and cholesterol in HDL subfractions: ApoE-Containing HDL-C and ApoE-deficient HDL-C. A method for enzymatically and separately quantifying cholesterol in the ApoE-deficient HDL comprising: adding a surfactant composed of a polyoxyethylene benzyl phenyl ether derivative to a test sample in a final concentration of 0.05 to 0.10%, reacting the test sample with cholesterol esterase and cholesterol oxidase, and quantifying hydrogen peroxide generated. A method for enzymatically and separately quantifying cholesterol in ApoE-Containing HDL comprising: adding a surfactant composed of a polyoxyethylene benzyl phenyl ether derivative so as to obtain a final concentration of 0.15 to 0.75%, reacting the test sample with cholesterol esterase and cholesterol oxidase, and quantifying hydrogen peroxide generated.

Abstract: Disclosed is the provision of a method for quantifying HDL3 in a test sample without requiring a laborious operation. The method for quantifying cholesterol in high-density lipoprotein 3 comprises allowing a surfactant(s) which specifically react(s) with a high-density lipoprotein 3 to react with a test sample and quantifying cholesterol, and the surfactant(s) is(are) at least one selected from the group consisting of polyoxyethylene polycyclic phenyl ether and polyoxyethylene styrenated phenyl ether.

Abstract: Provided is a means for improving measurement accuracy in an immunoassay using a dry plastic cell. A method for reducing adsorption of bubbles onto a cell side surface in an immunoassay, the method including carrying out a reaction and/or measurement in a presence of a surfactant, wherein the immunoassay comprises carrying out an antigen-antibody reaction in a dry plastic cell using an immunoassay reagent which immunologically reacts with a substance to be measured in a sample and carrying out an optical measurement of a resultant reacted product.

Abstract: Disclosed is a simple device for a membrane assay using the lateral flow immunoassay method, whereby a subject to be detected can be detected at a high sensitivity, provided with, as a label drying pad, a substrate which has a higher tensile strength than glass fiber and can well release a label. The present invention provides a simple membrane assay device, comprising: a supporting board, a sample supply part, a label containing a labeling component which labels a subject to be detected, a development part formed with a detection part which includes a trapping reagent for detecting or quantifying the subject to be detected, and an absorption part, wherein a non-woven fabric which includes fibers having a fiber diameter of 0.05 to 10 ?m is used in the labeling component part.

Abstract: A method that enables quantification of cholesterol in high-density lipoprotein 3 (HDL3) in a test sample without requiring a laborious operation is disclosed. The method for quantifying cholesterol in HDL3 having: Step 1 wherein a surfactant that reacts with lipoproteins other than high-density lipoprotein 3 is reacted with a test sample to transfer cholesterol to the outside of the reaction system; and Step 2 in which cholesterol remaining in the reaction system is quantified. The method enables specific quantification of HDL3 cholesterol in a test sample using an automatic analyzer without requirement of a laborious operation such as ultracentrifugation or pretreatment. Further, quantification of the HDL2 cholesterol level can also be carried out by subtracting the HDL3 cholesterol level from the total HDL cholesterol level obtained by a conventional method for quantifying the total HDL cholesterol in a test sample.