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Analytical methods based on transformations with hydrochloric acid.
1Chemical Works of Gedeon Richter Ltd., P.O. Box 27, H-1475 Budapest, Hungary.
Journal of Pharmaceutical and Biomedical Analysis
|January 1, 1983
Summary
New ultraviolet spectrophotometric methods quantify alpha-ethyl benzhydrol derivatives and impurities. Hydrochloric acid catalysis transforms compounds into detectable aromatic chromophores for accurate analysis.
Area of Science:
- Analytical Chemistry
- Organic Chemistry
- Spectroscopy
Background:
- Accurate quantification of pharmaceutical compounds and impurities is crucial for quality control.
- Existing methods may lack sensitivity or specificity for certain benzhydrol derivatives.
Purpose of the Study:
- To develop and describe novel ultraviolet spectrophotometric methods for analyzing alpha-ethyl benzhydrol derivatives.
- To establish methods for identifying and quantifying specific impurities like RGH-3395.
- To provide a gas chromatographic method for ethynodiol diacetate determination.
Main Methods:
- Ultraviolet spectrophotometry utilizing hydrochloric acid-catalyzed dehydration reactions.
- Formation of unsaturated aromatic chromophores for detection.
- Gas chromatography for ethynodiol diacetate analysis via its 3,5-diene derivative.
Main Results:
- Successful development of spectrophotometric methods for flumecinol and RGH-3395.
- Identification of RGH-3395 as an impurity of flumecinol.
- Establishment of a gas chromatographic method for ethynodiol diacetate.
Conclusions:
- The described methods offer reliable and sensitive quantification of target compounds and impurities.
- Hydrochloric acid catalysis is an effective strategy for generating chromophores for spectrophotometric analysis.
- These analytical techniques contribute to pharmaceutical quality assurance.