Method for measurement of equol in biological sample by immunoassay, kit for the measurement, and method for determination of equol production ability of subject

摘要

Disclosed are: a method for measuring equol in a biological sample by an immunoassay; a kit for the measurement; and a method for determining the equol production ability of a subject.The measurement method is characterized by using S-equol as at least one antigen selected from the group consisting of a standard antigen to be used for the production of a calibration curve and a labeling antigen that competes with equol in the biological sample. The kit is characterized by including S-equol as at least one antigen selected from the group consisting of the standard antigen and the labeling antigen. The determination method is characterized by comprising a step of measuring equol in a biological sample derived from a subject who has ingested soybean isoflavone by an immunoassay using S-equol as at least one antigen selected from the group consisting of the standard antigen and the labeling antigen and a step of determining the equol production ability of the subject based on the measurement value of equol obtained in the previous step.