Abstract
In order to clarify the causes for decrease of the coenzymatic activity of FAD during preservation, studies, were made on the decomposition products by means of paper partition chromatography with several solvent systems. Consequently, two new fluorescent spots were detected when n-butanol・pyridine・water (4 : 6 : 4) was used as the developing solvent. These two substances showed nearly equal Rf values to those of FAD-X and FMN-X respectively in several developing solvents. However, identification of these compounds will be reported in following papers.
