Abstract
S-Benzoyl derivative of thiamine, such as S-benzoylthiamine O-monophosphate (BTMP) is de-S-benzoylated to thiamine monophosphate (TMP) by the SH-compound, e. g., L-homocysteine and thioglycollate as well as L-cysteine in the medium, showing the thiamine activity to L. fermenti. It is not the case with other reducing agents, such as sodium thiosulfate, hydrosulfite and thiourea. So the mechanism of the reaction by the SH-compound is not reduction but possibly transbenzoylation to SH compounds.
