抄録
OMP, a toxic decomposition product of thiamine can be clearly separated from other related compounds by paper partition chromatography using butanol・acetic acid・water (4 : 1 : 5) as developer and can be found located definitely under ultraviolet light (wave-length of 254mμ) as a dark image. Although semiquantitative experiment reveals that contamination of OMP or other impurities such as SB, TDS, B_1-thiazolone, Thiochrome, AMP or Th may not exceed 1% for ordinary crystalline thiamine salt, at least two unidentified substances having smaller or larger Rf value than thiamine appear on the cbromatogram. These substances show thiamine-like properties towards chemical reactions.
