Improved GLC determination of plasma nitroglycerin concentrations

Area of Science:

• Pharmacology
• Analytical Chemistry
• Biochemistry

Background:

• Nitroglycerin is a critical vasodilator with a narrow therapeutic window.
• Accurate quantification of nitroglycerin in biological matrices is essential for pharmacokinetic and pharmacodynamic studies.
• Existing analytical methods may lack the specificity or sensitivity required for low-level detection.

Purpose of the Study:

• To develop and validate a specific and quantitative assay for determining nanogram levels of nitroglycerin in plasma.
• To establish a reliable method for measuring nitroglycerin concentrations in rat and human plasma.

Main Methods:

• Stabilization of plasma samples with silver nitrate.
• Multiple liquid-liquid extraction using purified hexane.
• Gas chromatography with a 63Ni-electron-capture detector (ECD) for sensitive detection.
• Use of isosorbide dinitrate as an internal standard.

Main Results:

• The assay demonstrated high specificity and quantitative accuracy for nitroglycerin.
• Linear response was observed in the range of 0.1--50 ng/ml in rat plasma.
• The method achieved an average recovery of approximately 90% from spiked plasma samples.
• Minimal interference was noted from isomeric glyceryl dinitrates and endogenous plasma components.

Conclusions:

• A robust and sensitive analytical method for nitroglycerin in plasma has been established.
• This assay is suitable for pharmacokinetic studies requiring precise measurement of low nitroglycerin concentrations.
• The method's specificity and high recovery ensure reliable data in both preclinical and clinical research.