Bioanalysis of cimetidine by high-performance liquid chromatography

Area of Science:

• Pharmacology
• Analytical Chemistry
• Biochemistry

Background:

• Cimetidine is a histamine H2-receptor antagonist used for gastric acid-related disorders.
• Accurate quantification of cimetidine in biological fluids is crucial for bioavailability studies.
• Existing methods for cimetidine analysis often involve complex and time-consuming extraction procedures.

Purpose of the Study:

• To develop a rapid, reliable, and simplified method for quantifying cimetidine in body fluids.
• To improve the efficiency of cimetidine bioavailability studies.
• To enable simultaneous determination of cimetidine and its metabolites.

Main Methods:

• Direct adsorption of cimetidine from urine or plasma onto a C18 mini-column (Sep-Pak C18).
• Elution of cimetidine using acetonitrile.
• High-performance reversed-phase liquid chromatography (HPLC) analysis on a Partisil 10 ODS column.
• UV detection at 228 nm with an aqueous phosphate-methanol mobile phase.

Main Results:

• The developed HPLC method is rapid, accurate, and precise for cimetidine quantification.
• The procedure eliminates the need for tedious dual-phase solvent extractions.
• Minor adjustments to the mobile phase allow for concurrent analysis of cimetidine metabolites.

Conclusions:

• This novel HPLC method offers a significant improvement for analyzing cimetidine in biological samples.
• The simplified approach enhances the practicality of pharmacokinetic and bioavailability studies.
• The method's adaptability facilitates comprehensive analysis of cimetidine and its metabolic products.