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The role of the detectors in High-Performance Liquid Chromatography (HPLC) is to analyze the solutes as they exit from the chromatographic column. The detector recognizes the solute's property and generates corresponding electrical signals, which are converted into a readable graph of the detector's response versus elution time called a chromatogram at the computer. There are several types of HPLC detectors, each with its own advantages and limitations, depending on the analyte...
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A Convenient Method for Extraction and Analysis with High-Pressure Liquid Chromatography of Catecholamine Neurotransmitters and Their Metabolites
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Highly sensitive LC-MS/MS analysis of catecholamines in plasma.

Marianne L Bergmann1, Anne Schmedes1

  • 1Biochemistry and Immunology, University Hospital of Southern Denmark, Vejle, Denmark.

Clinical Biochemistry
|March 24, 2020
PubMed
Summary

This study developed a sensitive LC-MS/MS method for measuring epinephrine and norepinephrine in plasma. The validated assay accurately quantifies these crucial catecholamines across normal human plasma levels.

Keywords:
CatecholamineEpinephrineIn-sample Ion-pairing chromatographyMass spectrometryNorepinephrinePlasma

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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.