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Determination of ethinylestradiol in tablets by quantitative TLC method
Die Pharmazie
|December 1, 1982
Summary
A novel quantitative thin-layer chromatography (TLC) method simplifies ethinylestradiol determination in tablets. Enzymatic degradation prevents adsorption, allowing easy extraction and accurate densitometric analysis for routine quality control.
Area of Science:
- Pharmaceutical Analysis
- Chromatography
- Drug Quality Control
Background:
- Accurate quantification of ethinylestradiol in pharmaceutical formulations is crucial for ensuring therapeutic efficacy and patient safety.
- Traditional methods for ethinylestradiol determination can be affected by adsorption issues, complicating extraction and analysis.
- Developing robust and efficient analytical techniques is essential for routine quality control in pharmaceutical manufacturing.
Purpose of the Study:
- To develop and validate a new quantitative thin-layer chromatography (TLC) method for determining ethinylestradiol in tablet formulations.
- To address and overcome the challenge of ethinylestradiol adsorption onto excipients like starch during sample preparation.
- To establish a reliable method suitable for the routine analysis of ethinylestradiol in low-dose tablet products.
Main Methods:
- Development of a quantitative TLC method utilizing enzymatic degradation to prevent ethinylestradiol adsorption on starch.
- Facilitation of easy extraction of ethinylestradiol from tablet powder after enzymatic treatment.
- Quantitative evaluation of separated ethinylestradiol using densitometry at a wavelength of 280 nm.
Main Results:
- The developed TLC method demonstrated good precision, with a relative standard deviation (RSD) better than +/- 2.6% for most tablet samples.
- A slightly higher RSD of +/- 4.7% was observed for the Ambosex tablet formulation.
- The method proved effective in overcoming adsorption issues and enabling straightforward quantification.
Conclusions:
- The proposed quantitative TLC method is effective for the determination of ethinylestradiol in tablets.
- The enzymatic degradation approach successfully mitigates adsorption problems, simplifying sample preparation.
- This method is suitable for routine analysis of tablets containing low amounts of ethinylestradiol, contributing to pharmaceutical quality assurance.