抄録
Thiamine-decomposing thermostable factor of an edible fern (Pteridium aquilinum var.japonicum) isolated according to Hasegawa's method was examined by hydrolysis and paper chromatography for elucidating its structure. By hydrolysis of 32 mg of the factor, yellow needles of aglycone were obtained and identified as kaempferol by ultraviolet absorption spectrum, mixed melting point, and elementary analysis. The sugar part was analyzed by paper chromatography using butanol・acetic acid・water (4 : 1 : 2) as a developing solvent system, whereby two spots were detected by spraying ammoniacal AgNO_3 solution. One of them agreed with glucose and the other with maltose in Rf values. The factor of fern was thus identified as kaempferol-maltoside, possibly kaempferol-3-maltoside.
