Mechanistic Studies on Thiaminase I: Identification of the Product of Thiamin Degradation in the Absence of the Nucleophilic Cosubstrate
โ Scribed by Min Wu; Elizabeth T. Papish; Tadhg P. Begley
- Publisher
- Elsevier Science
- Year
- 2000
- Tongue
- English
- Weight
- 46 KB
- Volume
- 28
- Category
- Article
- ISSN
- 0045-2068
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โฆ Synopsis
Thiaminase I catalyzes the decomposition of thiamin under basic conditions in the absence of the nucleophilic cosubstrate. The product of this reaction was identified as the adduct resulting from the displacement of the thiazole moiety of thiamin by the ring opened form of thiamin.
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The degradation behavior of famotidine (1) was investigated in 25% ammonia solution and in 2 M NaOH. The hydrolysis of the drug in ammonia resulted in separation of [3-[[2-[(diaminomethylene)amino]-4-thiazolyl]methyl]thio]propionamide (3), an impurity listed in British Pharmacopoeia. The treatment w