Rapid microanalysis of anticonvulsants by high-performance thin-layer chromatography

Area of Science:

• Analytical Chemistry
• Pharmacology
• Clinical Diagnostics

Background:

• Accurate quantification of anticonvulsant drugs is crucial for effective therapeutic drug monitoring.
• Existing methods may be time-consuming or require larger sample volumes.
• High-performance thin-layer chromatography (HPTLC) offers a sensitive and efficient alternative for drug analysis.

Purpose of the Study:

• To develop and validate a rapid microanalytical method for simultaneous quantification of phenobarbital, phenytoin, primidone, and carbamazepine.
• To utilize high-performance thin-layer chromatography (HPTLC) for improved drug analysis.
• To establish a sensitive and efficient method for small plasma sample volumes.

Main Methods:

• A single plasma extraction procedure was developed for a 50-microliter sample.
• High-performance thin-layer chromatography (HPTLC) was employed for separation.
• Quantification was performed using in situ ultraviolet reflectance densitometry.

Main Results:

• The method demonstrated a coefficient of variation of less than 4% (n=8).
• Extraction efficiency was approximately 95%.
• The minimum detectable amount for all four anticonvulsants was 5 ng or less.

Conclusions:

• The described HPTLC method is rapid, sensitive, and efficient for microanalysis of key anticonvulsant drugs in plasma.
• This technique is suitable for therapeutic drug monitoring, requiring minimal sample volume.
• The method provides reliable quantification with high extraction efficiency and low detection limits.