抄録
When vitamin K_1 in benzene solution was exposed to the ultraviolet light and then subjected to thin-layer chromatography, a number of colored and fluorescent spots were detected. The main spots and the degradation process were as follow : [numerical formula] Spot 2 was prcduced in the presence of phytyl double bond. On the other hand, this double bond was not necessary for the formation of spot 3 and 4. Finally it was made clear that spot 3 was phthiocol.
