Abstract: An object is to provide a high performance liquid chromatography method which enables quantitative analysis with the stability of reduced pyrroloquinoline quinone under measurement conditions maintained. The object can be achieved by the following method. A high performance liquid chromatography analysis method, comprising: a sample preparation step of preparing a sample for high performance liquid chromatography containing reduced pyrroloquinoline quinone or a salt thereof from a specimen and a separation step of separating the reduced pyrroloquinoline quinone or a salt thereof contained in the sample for high performance liquid chromatography from the specimen using interaction between a stationary phase and a mobile phase by a high performance liquid chromatography method using a reversed phase column as the stationary phase and using an eluent comprising 0.050 to 1.5% by mass of phosphoric acid and/or hydrochloric acid and 20 to 50% by volume of methanol and/or acetonitrile as the mobile phase.

Abstract: Provided is a solubilization enhancer for pyrroloquinoline quinone or a salt thereof in an aqueous solvent, comprising resistant dextrin as an active ingredient.

Abstract: The present invention provides a beverage containing pyrroloquinoline quinone and/or a salt thereof, an amino acid and/or a salt thereof, and ascorbic acid and/or a salt thereof, wherein the content of ascorbic acid and/or a salt thereof is two or more mass times the content of pyrroloquinoline quinone and/or a salt thereof.

Abstract: The present invention provides a stabilizer for pyrroloquinoline quinone and/or a salt thereof, wherein the stabilizer comprises one or more sweetening components as active ingredients selected from the group consisting of erythritol, acesulfame potassium, and a reduced starch syrup.

Abstract: Provided in the present invention is a photodeterioration inhibitor of pyrroloquinoline quinone and/or a salt thereof, comprising, as active ingredient(s), one or more colorants selected from the group consisting of tar colorant, carthamus yellow colorant, cochineal colorant, purple sweet potato colorant, red radish colorant, green colorant, gardenia blue colorant and caramel colorant.

Abstract: An analysis method having: a sample preparation step of preparing a measurement sample by mixing a measurement object containing pyrroloquinoline quinone or a salt thereof with glycine so that the pyrroloquinoline quinone or the salt thereof reacts with the glycine to produce imidazopyrroloquinoline or a salt thereof; and a quantitative analysis step of determining quantitatively the amount of the pyrroloquinoline quinone and the salt thereof contained in the measurement object, based on a chromatogram of the imidazopyrroloquinoline or the salt thereof contained in the measurement sample obtained by chromatography.

Abstract: The present invention provides pyrroloquinoline quinone monosodium having a structure represented by the following formula (1).

Abstract: Provided is an acidic beverage comprising (A) pyrroloquinoline quinone or a salt thereof, (B) ascorbic acid, and (C) cyclodextrin, wherein all the components are dissolved.

Abstract: Provided is a tea flavor improving agent comprising 10 to 210 mg/L of a salt of pyrroloquinoline quinone as an active ingredient per liter of tea.

Abstract: Provided is a solubilization enhancer for pyrroloquinoline quinone or a salt thereof in an aqueous solvent, comprising resistant dextrin as an active ingredient.

Abstract: Provided is a gummy candy comprising a fat and oil, a hydrophobic emulsifier, pyrroloquinoline quinone or a salt thereof, and gelatin.

Abstract: The present invention is a capsule containing pyrroloquinoline quinone or salt thereof, a branched-chain amino acid, and an edible oil or fat or a cyclodextrin as contents of the capsule.

Abstract: An analysis method having: a sample preparation step of preparing a measurement sample by mixing a measurement object containing pyrroloquinoline quinone or a salt thereof with glycine so that the pyrroloquinoline quinone or the salt thereof reacts with the glycine to produce imidazopyrroloquinoline or a salt thereof; and a quantitative analysis step of determining quantitatively the amount of the pyrroloquinoline quinone and the salt thereof contained in the measurement object, based on a chromatogram of the imidazopyrroloquinoline or the salt thereof contained in the measurement sample obtained by chromatography.

Abstract: The present invention provides a jelly containing pyrroloquinoline quinone and/or a salt thereof, a non-reducing sugar and a gelling agent.

Abstract: The present invention provides pyrroloquinoline quinone monosodium having a structure represented by the following formula (1).

Abstract: The present invention provides a method of inducing autophagy, the method including administering to a subject an effective amount of a pyrroloquinoline quinone compound or a salt thereof.

Abstract: There are provided an alkali metal salt of 5-hydroxy-4-oxo-5-(2-oxopropyl)-4,5-dihydro-1H-pyrrolo[2,3-f]quinoline-2,7,9-tricarboxylic acid, a method for producing the alkali metal salt, and a cocrystal comprising the alkali metal salt.

Abstract: There is provided a production method for the purpose of improving the solubility of an arginine-residue imidazopyrroloquinoline in water and making the purity thereof high. There is provided a compound represented by general formula (1): wherein n is 1, 2, 3 or 4; and M is an alkali metal or ammonium.

Abstract: The present invention provides a life-extending agent comprising pyrroloquinoline quinone and/or a derivative of the pyrroloquinoline quinone.

Abstract: There is provided a production method for the purpose of improving the solubility of an arginine-residue imidazopyrroloquinoline in water and making the purity thereof high. There is provided a compound represented by general formula (1): wherein n is 1, 2, 3 or 4; and M is an alkali metal or ammonium.