Abstract
Decomposition percentages of O-benzoylthiamine disulfide (BTDS) and S-carbalkoxythiamine, e.g. carbethoxythiamine (CET), carbobutoxythiamine (CBT), and O, S-dicarbethoxythiamine (DCET) by the bacterial thiaminase I and II were studied comparing with that of thiamine, dibenzoylthiamine (DBT) and thiamine disulfide (TDS). It was observed that BTDS, CET, CBT, and DCET were resistant to the thiaminases as well as that of DBT and TDS. On the other hand it was found that DCET was stable in the reaction mixture with thiaminase I and II, while CET and CBT were easily converted to thiamine and partly decomposed by thiaminase II.
