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Solid phase extraction for an improved assay of physostigmine in biological fluids
1Department of Pharmacology, London Hospital Medical College, UK.
Biomedical Chromatography : BMC
|September 1, 1989
Summary
This study presents a simple, sensitive assay for quantifying physostigmine in biological samples. The developed method offers high recovery and precision for accurate physostigmine measurement in blood, plasma, and urine.
Area of Science:
- Analytical Chemistry
- Biochemistry
Background:
- Accurate quantification of physostigmine is crucial for therapeutic drug monitoring and toxicological analysis.
- Existing methods may lack the required sensitivity, selectivity, or simplicity for routine analysis.
Purpose of the Study:
- To develop and validate a simple, selective, and highly sensitive assay for physostigmine quantification.
- To optimize solid-phase extraction and HPLC conditions for reliable analysis in biological matrices.
Main Methods:
- Systematic investigation and selection of an optimal solid-phase extraction column from nine types.
- Optimization of extraction conditions using radiolabeled physostigmine ([3H]physostigmine) to achieve >90% recovery.
- Quantification using High-Performance Liquid Chromatography (HPLC) with a three-electrode coulometric detection system.
Main Results:
- Achieved overall recoveries greater than 90% for physostigmine extraction.
- Established a limit of detection of 50 pg/mL for a 0.5 mL plasma sample.
- Demonstrated high precision with a coefficient of variation (CV) of 8.1% for 0.5 mL plasma samples containing 50 pg of physostigmine.
Conclusions:
- The developed assay is simple, selective, and highly sensitive for physostigmine quantification.
- The method is applicable to plasma, blood, and urine samples, offering a reliable tool for clinical and forensic analysis.