The black soybean hull extract (Black Soy Bean Hull Extract) and the like natural ones, the food and drink and the medical supply and/or origomeritsukupuroshianijin which is included in the cosmetics (OPC) entire content and/or average degree of polymerization being new it measures, it offers simple method. In addition, the standard setting method of OPC as a healthy food is offered. As stationary phase offering the sample to the column chromatography which uses the acidification ethanol, the ethanol and the acetone which acquire gray level gradient making use of the sequential phase dextran type column, as flow phase, it extracts it comes after each cutoff which is obtained thiol it disassembles, the content in each cutoff of epikatekin and epikatekinchioeteru which it occurs it measures, from epikatekin of each cutoff which is obtained and content of epikatekinchioeteru, following to specified arithmetic expression, the gross weight of OPC in the sample and/or it calculates the eluant by each flow phase, average degree of polymerization.
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