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Related Concept Videos

Mass Spectrometry: Overview01:19

Mass Spectrometry: Overview

Mass spectrometry is an analytical technique used to determine the molecular mass and molecular formula of a compound. The basic principle of mass spectrometry is to generate ions from the analyte molecule and measure these ion abundances against their molecular mass. One common type of ionization, known as electron ionization or EI, bombards the analyte molecules in the gas phase with high-energy electron beams. The electron beams displace an electron from the molecule and leave behind a...
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This lesson details the instrumentation of a mass spectrometer—a physical instrument to perform mass spectrometry on analyte molecules and record the characteristic mass spectra. This is achieved via three chief functions:
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MALDI-TOF Mass Spectrometry01:19

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Mass spectrometry is a powerful characterization technique that can identify and separate a wide variety of compounds ranging from chemical to biological entities, based on their mass-to-charge ratio (m/z). The instruments that allow this detection, known as mass spectrometers, have three components: an ion source, a mass analyzer, and a detector. These spectrometers differ based on the nature of their ion source and analyzers.Matrix-assisted laser desorption ionization (MALDI) is a commonly...
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Mass spectrometry is an important technique for the identification of pure compounds. However, it has some limitations for the analysis of complex mixtures, often due to excessive fragmentation making the spectrum too complicated to decipher. Mass spectrometry can be combined with suitable separation methods in sequence, forming hyphenated methods, which are useful in the analysis of complex mixtures.
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Related Experiment Video

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Investigation of Microbial Cooperation via Imaging Mass Spectrometry Analysis of Bacterial Colonies Grown on Agar and in Tissue During Infection
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A quantitation method for mass spectrometry imaging.

Stormy L Koeniger1, Nari Talaty, Yanping Luo

  • 1Advanced Technology, GPRD, Abbott Laboratories, Abbott Park, IL 60064, USA. stormy.koeniger@abbott.com

Rapid Communications in Mass Spectrometry : RCM
|January 25, 2011
PubMed
Summary

A new quantitation method for matrix-assisted laser desorption/ionization mass spectrometry imaging (MALDI-MSI) enables precise drug measurement in tissues. This approach correlates MSI data with liquid chromatography-tandem mass spectrometry, offering accurate quantification for pharmaceutical analysis.

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Area of Science:

  • Analytical Chemistry
  • Pharmacology
  • Biotechnology

Background:

  • Mass spectrometry imaging (MSI) offers spatial drug distribution analysis but often lacks precise quantification.
  • Accurate drug quantitation in tissues is crucial for pharmacokinetics and drug development.

Purpose of the Study:

  • To develop and validate a novel quantitation method for matrix-assisted laser desorption/ionization mass spectrometry imaging (MALDI-MSI).
  • To establish a correlation between MALDI-MSI response and drug concentrations measured by liquid chromatography-tandem mass spectrometry (LC/MS/MS).

Main Methods:

  • Tissue homogenization and extraction of adjacent sections for LC/MS/MS analysis.
  • MALDI-MSI analysis of rat liver tissue following olanzapine administration.
  • Correlation of integrated MSI response with LC/MS/MS determined drug concentrations.

Main Results:

  • A linear correlation (R(2) = 0.9792) was established between MALDI-MSI and LC/MS/MS for olanzapine concentrations from ~300 to 60,000 ng/g.
  • A conversion factor of 6.3 ± 0.23 fg/ion count was determined for pixel-level quantitation (100 µm).
  • The method demonstrated accuracy over two orders of magnitude.

Conclusions:

  • The developed method provides accurate and reliable drug quantitation at the pixel level using MALDI-MSI.
  • This technique significantly enhances the utility of MSI in pharmaceutical analysis and drug distribution studies.
  • Implementation considerations for this quantitation method are discussed.