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Chromatography of retinoids
1Department of Drug Metabolism, F. Hoffmann-La Roche Ltd., Basel, Switzerland.
Journal of Chromatography
|October 12, 1990
Summary
Accurate determination of retinoids in biological samples requires careful handling due to their sensitivity. High-performance liquid chromatography (HPLC) with automated column switching offers a sensitive and efficient method for retinoid analysis.
Area of Science:
- Analytical Chemistry
- Biochemistry
- Pharmacology
Background:
- Retinoids, including retinoic acids, aromatic retinoids, and arotinoids, are crucial signaling molecules.
- Their sensitivity to isomerization and oxidation, coupled with high protein binding and insolubility, complicates analysis in biological matrices.
- Accurate quantification is essential for understanding retinoid metabolism and function in various physiological and pathological processes.
Purpose of the Study:
- To review and discuss methods for the determination of retinoids and their metabolites in biological samples.
- To highlight challenges associated with retinoid analysis, including sample preparation and stability.
- To evaluate the suitability of different chromatographic techniques for routine retinoid quantification.
Main Methods:
- Review of various extraction procedures, including liquid-liquid extraction for biological fluids and lyophilized tissues.
- Discussion of high-performance liquid chromatography (HPLC) with ultraviolet detection as a primary analytical technique.
- Evaluation of gas chromatography-mass spectrometry (GC-MS) for specific retinoid classes and comparison with HPLC methods.
Main Results:
- HPLC with ultraviolet detection is effective for separating geometric isomers and metabolites of retinoids.
- Direct injection techniques using HPLC with automated column switching simplify sample work-up and protect retinoids from degradation.
- GC-MS is suitable for third-generation retinoids but requires extensive sample preparation; it is not ideal for first- and second-generation retinoids due to isomerization.
Conclusions:
- Careful sample handling, extraction, and chromatographic separation are critical for accurate retinoid determination.
- Direct injection HPLC with automated column switching represents a sensitive and robust method for routine retinoid analysis.
- HPLC-UV detection is the preferred method for its speed, sensitivity, and ability to resolve retinoid isomers and metabolites.