Abstract: A method of measuring an amount of a polyphenol compound in a liquid sample containing at least one polyphenol compound comprises a step of separating the liquid sample into each component, a step of adding at least one reagent capable of specifically reacting with the polyphenol compound to emit light, into the components separated in the separating step, thereby to perform a reaction, and a step of detecting the light emitted by the reaction, wherein the separation in the separating step is conducted by a liquid chromatography and the reagent used for the reaction is the combination of an oxidizing agent of the polyphenol compound, a heme compound and a hydrogen acceptor. A device suitable for performing the above method is also disclosed.

Abstract: A method and apparatus for measuring a lipid peroxide, in which a sample containing lipids is subjected to a liquid chromatography to separate the lipids into lipid classes. The lipid classes are brought into contact with a luminescent reagent which specifically reacts with a lipid hydroperoxide contained in the lipid classes to generate a light in an amount corresponding to a content of the hydroperoxide. The light is optically detected by a photodetector.