Abstract
An improved method of crystallization of a new type of thiamine-copper-complex, having a composition of C_<12>H_<16-17>O_2N_4SCu and mp. 152-157℃ (decomp.) is described. The crystal is easily soluble in 25% KCl-HCl solution or in diluted HCl at pH 1 and its thiamine content is about 78.6%. From the results of crystallizing processes, ultimate analysis, copper and thiamine contents, ultraviolet and infrared absorption spectra, it is assumed that this compound is the complex of bivalent copper and thiamine of thiol-type, and is constituted by two components of different copper content.
