Radiochemical GLC assay for nortriptyline in human plasma

Area of Science:

• Analytical Chemistry
• Pharmacology
• Biochemistry

Background:

• Accurate quantification of nortriptyline in biological samples is crucial for therapeutic drug monitoring.
• Existing methods may have limitations in sensitivity or complexity.
• Development of a sensitive and reliable assay for nortriptyline is needed.

Purpose of the Study:

• To develop and validate a novel, sensitive method for the quantitative assay of nortriptyline in human plasma.
• To establish the utility of radiochemical acetylation coupled with gas-liquid chromatography (GLC) for this purpose.

Main Methods:

• Nortriptyline was extracted from plasma samples.
• The extracted nortriptyline was subsequently acetylated using 3H-acetic anhydride.
• The amount of 3H-acetylnortriptyline was quantified using radiochemical gas-liquid chromatography (GLC).
• Instrumentation was assembled from readily available commercial components.

Main Results:

• The developed method demonstrated high sensitivity, capable of assaying concentrations as low as 5 ng of nortriptyline per milliliter of plasma.
• The assay provides a reliable means for quantifying nortriptyline in plasma samples.

Conclusions:

• A novel and sensitive radiochemical GLC method for nortriptyline plasma assay has been successfully developed.
• This method, utilizing acetylation with 3H-acetic anhydride, offers a viable option for clinical and research settings requiring precise nortriptyline quantification.