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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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Tandem mass spectrometry is a technique that uses multiple mass analyzers in series to obtain a higher selectivity and reduce chemical noise during analyte detection. Instruments with multiple analyzers separated by an interaction cell enable secondary fragmentation and selected study of the fragment ions.Secondary fragmentations occur in the interaction cell and can be induced by various factors. Fragmentation induced by collision with inert gases, such as N2, Ar, He, etc., is called...
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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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The quadrupole mass analyzer consists of four cylindrical metal rods arranged in a diamond carrying a DC voltage and a radio-frequency AC voltage. The motion of ions through the quadrupole depends on the field strength, causing only ions of a certain m/z to resonate successfully and strike the detector at a given field strength. Though the transmission rate for these analyzers is high, the exact elemental composition of the sample is not determined because of low resolution; however, they are...
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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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Sample Preparation Strategies for Mass Spectrometry Imaging of 3D Cell Culture Models
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A Versatile Platform for Mass Spectrometry Imaging of Arbitrary Spatial Patterns.

Kenneth P Garrard1,2,3, Måns Ekelöf1, Sitora Khodjaniyazova1

  • 1FTMS Laboratory for Human Health Research, Department of Chemistry, North Carolina State University, Raleigh, North Carolina 27695, United States.

Journal of the American Society for Mass Spectrometry
|June 17, 2020
PubMed
Summary

RastirX is a new platform for mass spectrometry imaging (MSI) that uses a vision system to precisely target arbitrary sample regions. This automated approach reduces data acquisition time and improves data quality by minimizing off-sample measurements.

Keywords:
Arbitrary Region of InterestMALDESIMass Spectrometry ImagingVision-System

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Area of Science:

  • Analytical Chemistry
  • Spectroscopy
  • Imaging Technology

Background:

  • Mass spectrometry imaging (MSI) enables spatial analysis of molecular distributions on samples.
  • Traditional MSI methods often involve scanning rectangular regions, leading to inefficiencies and potential contamination.
  • Automated sample targeting and data acquisition are crucial for high-throughput MSI analysis.

Purpose of the Study:

  • To develop and present RastirX, a novel vision-system driven platform for mass spectrometry imaging.
  • To enable the imaging of arbitrary two-dimensional regions of interest (ROIs) on samples.
  • To enhance the efficiency and accuracy of MSI data acquisition.

Main Methods:

  • RastirX utilizes a vision system to allow users to define arbitrary ROIs on a live sample image.
  • Automated motion control generates precise sample stage movements for targeted data acquisition.
  • Synchronization of sample stage, laser firing, and mass spectrometer (MS) scan acquisition is fully automated.
  • The platform generates co-registered optical images and scan location data for imzML conversion.

Main Results:

  • RastirX successfully enables MSI of arbitrarily shaped ROIs.
  • Imaging specific ROIs significantly reduces contamination from off-sample material.
  • Acquisition time is substantially reduced compared to scanning minimal enclosing rectangles.

Conclusions:

  • RastirX provides an efficient and accurate method for mass spectrometry imaging of complex sample areas.
  • The vision-guided targeting system streamlines MSI workflows and improves data integrity.
  • This platform offers a significant advancement for applications requiring precise spatial molecular analysis.