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[Chromatographic method of determining membrane epoxide hydrolase activity]
Antibiotiki I Meditsinskaia Biotekhnologiia = Antibiotics and Medical Biotechnology
|July 1, 1985
Summary
A new, rapid, and sensitive method quantifies epoxide hydrolase activity in rat liver microsomes using HPLC. This technique simplifies drug metabolism studies by avoiding sample extraction and derivatization.
Area of Science:
- Biochemistry
- Enzymology
- Pharmacology
Context:
- Epoxide hydrolase (EC 3.3.2.3) is crucial for the second phase of drug metabolism.
- Rat liver microsomes are a common model for studying drug metabolism enzymes.
- Accurate determination of enzyme activity is essential for understanding drug interactions and toxicity.
Purpose:
- To develop a novel, highly sensitive, and rapid method for determining epoxide hydrolase activity.
- To establish a quantitative assay using 9,10-Epoxy-9,10-dihydrophenanthrene as a substrate.
- To validate the method's simplicity and efficiency for routine use in biochemical assays.
Summary:
- A new HPLC method was developed for quantifying epoxide hydrolase activity in rat liver microsomes.
- The assay utilizes 9,10-Epoxy-9,10-dihydrophenanthrene as a substrate and 1-Naphthol as an internal standard.
- Quantitative determination of the product, 9,10-dioxy-9,10-dihydrophenanthrene, is achieved via fluorescent detection with a 3-minute analysis time.
Impact:
- This method offers a simplified, sensitive, and rapid approach to epoxide hydrolase activity assessment.
- It eliminates the need for preliminary sample extraction and derivative preparation.
- The assay's efficiency and accuracy (≤5% error) facilitate streamlined drug metabolism research.