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Analysis of lorazepam in rat brain using liquid/liquid and solid-phase extraction in combination with high
S Gunawan1, N Y Walton, D M Treiman
1Neurology Service, Veteran Administration Medical Center, West Los Angeles, California.
Biomedical Chromatography : BMC
|July 1, 1990
Summary
This study details a new method for measuring lorazepam in rat brain tissue using advanced extraction and chromatography techniques. The validated method offers high sensitivity and precision for lorazepam determination.
Area of Science:
- Pharmacology
- Analytical Chemistry
- Neuroscience
Background:
- Accurate quantification of benzodiazepines in biological matrices is crucial for pharmacokinetic and pharmacodynamic studies.
- Existing methods for lorazepam determination in brain tissue may lack the required sensitivity or efficiency.
Purpose of the Study:
- To develop and validate a sensitive and precise analytical method for the determination of lorazepam in rat brain tissue.
- To establish a reliable technique for quantifying lorazepam concentrations in preclinical research.
Main Methods:
- Liquid-liquid and solid-phase extraction (C18-Bond Elut) were employed for sample preparation.
- High-performance liquid chromatography (HPLC) with reversed-phase analysis was used for separation.
- Chlordiazepoxide served as the internal standard, and detection was performed at 240 nm.
Main Results:
- The method demonstrated a sensitivity limit of 10 ng/100 mg brain tissue.
- A linear standard curve was observed for lorazepam concentrations ranging from 20 to 200 ng.
- Day-to-day precision showed coefficients of variation between 4.5% and 13.6%.
Conclusions:
- The described method is suitable for the accurate and precise quantification of lorazepam in rat brain tissue.
- This validated technique can be valuable for neuroscience and pharmacology research involving lorazepam.