Abstract: Provided are a polyphenol compound absorption promoter which is widely applicable to foods and drinks over a wide range, and a method for producing a food, drink or food material containing a polyphenol compound. The polyphenol compound absorption promoter comprises, as the active ingredient, at least one member selected from the group consisting of serine, aspartic acid, malic acid, capric acid, lauric acid, grapefruit juice and Camellia sinensis (L.) O. Kuntze extract. The method for producing a food, drink or food material containing a polyphenol compound comprises: adding at least one member selected from the group consisting of serine, aspartic acid, malic acid, capric acid, lauric acid, grapefruit juice and Camellia sinensis (L.) O.

Abstract: The method for measuring the concentration of the measuring object uses a sensor chip comprising an optical waveguide layer and an antibody immobilized layer formed on the surface of the optical waveguide layer, which comprises immobilizing the measuring object and an enzyme-labeled antibody labeled with a labeling enzyme on the antibody immobilized layer of the sensor chip having an immobilized antibody, producing a color-developing and precipitating enzyme reaction product by allowing to react a coloring reagent with the labeling enzyme on the antibody immobilized layer to precipitate the enzyme reaction product on the antibody immobilized layer, allowing to totally reflect a light impinged on the sensor chip from the outside at an interface between the optical waveguide layer and the antibody immobilized layer, and observing to a physical value of the totally reflected light.

Abstract: The method for measuring the concentration of the measuring object uses a sensor chip comprising an optical waveguide layer and an antibody immobilized layer formed on the surface of the optical waveguide layer, which comprises immobilizing the measuring object and an enzyme-labeled antibody labeled with a labeling enzyme on the antibody immobilized layer of the sensor chip having an immobilized antibody, producing a color-developing and precipitating enzyme reaction product by allowing to react a coloring reagent with the labeling enzyme on the antibody immobilized layer to precipitate the enzyme reaction product on the antibody immobilized layer, allowing to totally reflect a light impinged on the sensor chip from the outside at an interface between the optical waveguide layer and the antibody immobilized layer, and observing to a physical value of the totally reflected light.