Highly sensitive LC-MS/MS analysis of catecholamines in plasma.

Area of Science:

• Clinical Chemistry
• Analytical Chemistry
• Biochemistry

Background:

• Catecholamines, epinephrine (E) and norepinephrine (NE), are vital neurotransmitters and hormones.
• Accurate measurement of plasma E and NE is critical for medical research.
• Low plasma concentrations necessitate highly specific and sensitive analytical methods.

Purpose of the Study:

• To develop and validate a sensitive analytical method for quantifying E and NE in human plasma.
• To establish a method capable of measuring E and NE within the entire reference interval.

Main Methods:

• Plasma samples underwent solid-phase extraction for E and NE isolation.
• An in-sample ion-pairing chromatography (IPC) liquid chromatography-tandem mass spectrometry (LC-MS/MS) technique was employed.
• The method allowed for the diversion of the ion-pairing reagent away from the mass spectrometer's ion source.

Main Results:

• The developed LC-MS/MS method demonstrated good performance characteristics.
• The limit of quantification (LOQ) achieved was 0.20 nmol/L for NE and 0.02 nmol/L for E.
• The method's measuring range covers the complete reference interval for human plasma E and NE.

Conclusions:

• A robust and validated method for determining plasma E and NE concentrations has been established.
• This method provides the sensitivity and specificity required for clinical research involving catecholamines.
• The assay is suitable for measuring E and NE across the full spectrum of physiological concentrations in human plasma.