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Related Concept Videos

High-Resolution Mass Spectrometry (HRMS)01:15

High-Resolution Mass Spectrometry (HRMS)

The resolution of a mass spectrometer depends on the efficiency of separating ions with different ion masses. The mass of an atom is approximated to the sum of the masses of protons and neutrons inside, considering the masses of protons and neutrons as equal. However, the masses of the proton (1.6726 × 10−24 g) and neutron (1.6749 × 10−24 g) are not truly equal. There is a minor error in the expression of atomic masses relative to the simplest atom of hydrogen. For example, the mass of helium...
Mass Spectrum: Interpretation01:24

Mass Spectrum: Interpretation

An unknown compound can be established by identifying the molecular ion peak in the mass spectrum. The molecular ion peak is often weak or absent due to the predominance of fragmentation in high-energy electron beams. In such cases, a soft-energy electron beam can be used to scan the spectrum to enhance the intensity of the molecular ion peak. Additionally, chemical ionization, field ionization, and desorption ionization spectra are used to obtain a relatively intense molecular ion peak.To...
MALDI-TOF Mass Spectrometry01:19

MALDI-TOF Mass Spectrometry

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...
Tandem Mass Spectrometry01:21

Tandem Mass Spectrometry

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...
Mass Spectrometry: Complex Analysis01:21

Mass Spectrometry: Complex Analysis

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.
GC–MS is a powerful hyphenated method commonly used in forensics and environmental...
Mass Analyzers: Overview01:13

Mass Analyzers: Overview

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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Updated: Jul 8, 2026

Analyzing Large Protein Complexes by Structural Mass Spectrometry
15:35

Analyzing Large Protein Complexes by Structural Mass Spectrometry

Published on: June 19, 2010

Signal detection in high-resolution mass spectrometry data.

Dale F McLerran1, Ziding Feng, O John Semmes

  • 1Fred Hutchinson Cancer Research Center, Seattle, Washington 98109, USA.

Journal of Proteome Research
|January 5, 2008
PubMed
Summary

This study characterizes background noise in mass spectrometry data. Robust regression methods improve the detection of low-abundance peptide signals by distinguishing them from background ions.

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Analyzing Large Protein Complexes by Structural Mass Spectrometry
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Published on: February 27, 2020

Area of Science:

  • Analytical Chemistry
  • Biochemistry
  • Proteomics

Background:

  • High-resolution time-of-flight mass spectrometry generates extensive data with numerous noninformative background ions.
  • Distinguishing low-abundance peptide signals from background noise is challenging using traditional signal-to-noise ratios.
  • Existing methods risk removing true peptide signals along with noise.

Purpose of the Study:

  • To characterize background ion distributions in mass spectrometry data.
  • To develop a method for improving the detection of low-abundance peptide signals.
  • To enhance the precision of identifying peptide-related features in complex spectra.

Main Methods:

  • Utilized robust-regression methods to model background peak intensities and locations.
  • Estimated distributions for null (background) peak characteristics.
  • Defined signal peaks as outliers relative to the characterized background distributions.

Main Results:

  • Successfully characterized background ion distributions.
  • Developed a method to differentiate signal peaks from background noise.
  • Demonstrated increased precision in detecting isotopic envelopes of low-abundance peptides.

Conclusions:

  • Characterizing background is crucial for accurate peptide signal detection.
  • Robust regression provides a robust approach to modeling background noise.
  • The proposed method enhances the identification of low-abundance peptides in high-resolution mass spectrometry.