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Degradation of trimethoprim
J J Bergh1, J C Breytenbach, P L Wessels
1Department of Pharmaceutical Chemistry, Potchefstroom University for Christian Higher Education, South Africa.
Journal of Pharmaceutical Sciences
|April 1, 1989
Summary
Trimethoprim degrades into five products through heat and light. Carbon-13 NMR spectroscopy identified the structures of these pyrimidine derivatives, revealing substitution patterns.
Area of Science:
- Pharmaceutical Chemistry
- Organic Chemistry
- Spectroscopy
Background:
- Trimethoprim is an antibiotic commonly used to treat bacterial infections.
- Understanding the degradation pathways of pharmaceuticals is crucial for drug stability and safety.
- Thermal and photochemical reactions can alter drug structures, potentially affecting efficacy.
Purpose of the Study:
- To investigate the degradation products of trimethoprim under thermal and photochemical conditions.
- To elucidate the structures of the resulting degradation compounds.
- To identify spectroscopic markers for determining the substitution patterns of pyrimidine derivatives.
Main Methods:
- Subjecting trimethoprim to thermal and photochemical stress.
- Utilizing physical methods for structural determination.
- Employing Carbon-13 Nuclear Magnetic Resonance (13C NMR) spectroscopy, specifically analyzing C-5 resonance.
Main Results:
- At least five distinct degradation products were formed from trimethoprim.
- The structures of these compounds were successfully determined.
- The C-5 resonance in the 13C NMR spectrum was found to be indicative of the substitution patterns in the amino hydroxy pyrimidines.
Conclusions:
- Trimethoprim is susceptible to degradation via hydrolysis and oxidation when exposed to heat and light.
- 13C NMR spectroscopy is a valuable tool for characterizing trimethoprim degradation products.
- The C-5 NMR signal provides key structural information about the resulting pyrimidine derivatives.