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Related Concept Videos

Mass Analyzers: Common Types01:19

Mass Analyzers: Common Types

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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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The mass analyzer is a crucial component of the mass spectrometer. In the ionization chamber, the vaporized sample is bombarded with a high-energy electron beam to generate a radical cation and further fragment into neutral molecules, radicals, and cations. A series of negatively charged accelerator plates accelerate the cations into the mass analyzer. The mass analyzer separates ions according to their mass-to-charge (m/z) ratios and then directs them to the detector. The common types of mass...
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Double Resonance Techniques: Overview01:12

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Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
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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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Dynamic Quadrupole Selection to Associate Precursor Masses with MS/MS Products in Data-Independent Acquisition.

Keaton L Mertz1, Lia R Serrano1, Pavel Sinitcyn2

  • 1Department of Chemistry, University of Wisconsin-Madison, Madison, Wisconsin 53706, United States.

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This study introduces a novel data-independent acquisition mass spectrometry method that varies quadrupole selection width to improve precursor ion identification. This technique enhances proteomic analysis by resolving co-isolated precursors, leading to more accurate results.

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Area of Science:

  • Proteomics
  • Analytical Chemistry
  • Mass Spectrometry

Background:

  • Data-independent acquisition (DIA) mass spectrometry enables high-throughput proteomic analyses.
  • Conventional DIA methods often co-select multiple precursor ions, leading to chimeric spectra and reduced accuracy.
  • Resolving co-isolated precursors is crucial for improving the reliability of bottom-up proteomic studies.

Purpose of the Study:

  • To develop and evaluate a novel DIA mass spectrometry method for improved precursor ion identification.
  • To enhance the resolution of co-isolated precursor ions in complex proteomic samples.
  • To assess the method's performance using various calibrants and sample types.

Main Methods:

  • A method varying quadrupole selection width during ion accumulation was implemented.
  • Scan-to-scan product ion intensity profiles were used to infer precursor mass by overlapping selection windows.
  • The technique was tested using internal calibrants and a tryptic-digest monoclonal antibody sample on Q-Orbitrap mass analyzers.
  • Direct infusion and liquid chromatography were employed for sample analysis.

Main Results:

  • The method successfully coupled product ion intensity to precursor ion mass.
  • Overlapping selection windows enabled the inference of precursor mass from product ion profiles.
  • With direct infusion, precursors separated by 1 Th were resolved using 10 Th windows with 5 Th overlap.
  • Product ions were associated within 0.3 Th of their precursor m/z, yielding a precursor ion m/z resolving power of ~33.

Conclusions:

  • The described method effectively resolves co-isolated precursor ions in DIA mass spectrometry.
  • This technique significantly improves the precursor ion m/z resolving power, enhancing proteomic data accuracy.
  • The method demonstrates broad applicability for analyzing complex proteomic samples, including antibody digests.