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Constant Volume Calorimetry

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Respiratory volumes are crucial metrics, meticulously measured to quantify the air exchanged in and out of the lungs during various phases of the breathing cycle. These precise measurements are vital for assessing lung function, diagnosing respiratory conditions, and monitoring overall respiratory health. Each parameter provides specific insights into the mechanics of breathing and the functional capacity of the lungs.
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Related Experiment Video

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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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A sensitive, high-throughput LC-MS/MS method for measuring catecholamines in low volume serum.

Jiamin Zheng1, Rupasri Mandal1, David S Wishart2

  • 1Department of Biological Sciences, University of Alberta, Edmonton, AB, T6G 2E9, Canada.

Analytica Chimica Acta
|October 8, 2018
PubMed
Summary

A new liquid chromatography-tandem mass spectrometry method accurately quantifies eight key catecholamines in serum. This sensitive, high-throughput assay uses minimal sample volume, ideal for targeted metabolomics.

Keywords:
CatecholaminesDerivatizationLC-MS/MSSerum

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Area of Science:

  • Analytical Chemistry
  • Biochemistry
  • Clinical Chemistry

Background:

  • Catecholamines are crucial biomarkers for various physiological and pathological states.
  • Accurate and sensitive quantification of catecholamines in serum is essential for clinical diagnostics and research.
  • Existing methods often require large sample volumes, limiting their application in targeted metabolomics.

Purpose of the Study:

  • To develop and validate a robust, sensitive, and high-throughput method for detecting and quantifying eight key catecholamines in human serum.
  • To optimize liquid chromatography-tandem mass spectrometry (LC-MS/MS) conditions for enhanced sensitivity and specificity.
  • To establish a method suitable for targeted metabolomics studies, particularly those with limited sample volumes.

Main Methods:

  • Liquid chromatography-tandem mass spectrometry (LC-MS/MS) in positive scheduled multiple reaction monitoring (MRM) mode.
  • Amine derivatization using phenylisothiocyanate (PITC) prior to LC separation on a C18 reversed-phase column.
  • Optimization of mass spectrometric conditions, fragmentations, and quantification transitions.

Main Results:

  • Achieved low nanomolar limits of detection for all target catecholamines.
  • Demonstrated high recovery rates (93.2%-113%) and satisfactory precision (<10.9%) in spiked serum samples.
  • Successfully applied the method to quantify dopamine, 5-methoxytryptamine, tyramine, phenylethylamine (PEA), epinephrine (EPI), norepinephrine (NE), metanephrine (MN), and normetanephrine (NMN) in human serum.

Conclusions:

  • The developed LC-MS/MS method provides a sensitive, specific, and high-throughput approach for serum catecholamine analysis.
  • The method's requirement for significantly less sample volume (10-20X reduction) makes it ideal for volume-limited targeted metabolomics.
  • Adaptation to a 96-well plate format enables high-throughput analysis of over 800 samples efficiently.