Abstract
The first paper of this series showed that the red fluorescent product was formed by reaction of thiamine with Cu^<2+>, and could be applied to the detection of the vitamin. The second report dealt with the reaction products between thiolized thiamine and Cu^<2+>, Cd^<2+> or Zn^<2+>, respectively. The molar ratio of metal to thiamine of the product was found to be 1 : 2. In this paper, the reaction between thiolized thiamine and Cu^+ was dascribed. The reaction product had a brilliant and stable red fluorescence and the molar ratio of Cu^* to thiamine was found to be 1 : 1. It is supposed that the reaction product is a metal chelate compound by the examination of ultraviolet and infrared spectura.
