Reducing power analysis method and reducing power analysis reagent

摘要

An object of the present invention is to provide a reducing power analysis method that can prevent peak wavelength shift in a sample. In order to achieve the above object, the reducing power analysis method of the present invention includes: a reduction step of reducing a dye reagent containing a ferric compound and a cyanide at pH conditions of 2.4 or lower in the presence of a sample; and an optical measurement step of optically measuring a peak wavelength of a reduced substance obtained in the reduction step.