Abstract: An object of the present invention is to provide a PDD diagnosis apparatus that even if there is a distance from an irradiation portion of an optical fiber to a diseased tissue, enables provision of a fluorescence detection sensitivity equivalent to that in a case where irradiation is provided in such a manner that the irradiation portion of the optical fiber is brought close to the diseased tissue.

Abstract: A process for producing an eriocitrin-containing material comprises the steps of: preparing an eriocitrin-containing citrus extract from a citrus fruit using an extractant; and separating eriocitrin from the citrus extract. The step of separating eriocitrin from the citrus extract comprises the steps of: bringing the citrus extract into contact with a porous synthetic adsorption resin such that eriocitrin in the citrus extract is adsorbed on the porous synthetic adsorption resin, the porous synthetic adsorption resin comprising a phenol-formaldehyde resin as a main framework and having amino and phenolic hydroxyl groups; and eluting the eriocitrin adsorbed on the porous synthetic adsorption resin using an elution solvent.

Abstract: A process for producing an eriocitrin-containing material comprises the steps of: preparing an eriocitrin-containing citrus extract from a citrus fruit using an extractant; and separating eriocitrin from the citrus extract. The step of separating eriocitrin from the citrus extract comprises the steps of: bringing the citrus extract into contact with a porous synthetic adsorption resin such that eriocitrin in the citrus extract is adsorbed on the porous synthetic adsorption resin, the porous synthetic adsorption resin comprising a phenol-formaldehyde resin as a main framework and having amino and phenolic hydroxyl groups; and eluting the eriocitrin adsorbed on the porous synthetic adsorption resin using an elution solvent.

Abstract: A process for producing a food material having a high concentration of eriocitrin, which comprises extracting a juice, a peel and a squeezed juice refuse of a citrus fruit with a polar solvent, applying the extract to a synthetic adsorption resin, and separating and recovering the food material having the high concentration of eriocitrin using an organic solvent such as hydrous alcohol. A food material having a high concentration eriocitrin as an antioxidant ingredient can industrially be produced quite efficiently without entraining an ingredient of a bitter taste, and drink and food having a high antioxidant effect can be produced.