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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...
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...
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...
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...
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...

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Related Experiment Video

Updated: Jun 24, 2026

Analyzing Large Protein Complexes by Structural Mass Spectrometry
15:35

Analyzing Large Protein Complexes by Structural Mass Spectrometry

Published on: June 19, 2010

An insight into high-resolution mass-spectrometry data.

J E Eckel-Passow1, A L Oberg, T M Therneau

  • 1Division of Biomedical Statistics & Informatics, Department of Health Sciences Research, Mayo Clinic College of Medicine, 200 First Street SW, Rochester, MN 55905, USA. eckelpassow.jeanette@mayo.edu

Biostatistics (Oxford, England)
|March 28, 2009
PubMed
Summary

Statistics is crucial for analyzing complex global proteomic data from mass spectrometry. New statistical methods are needed for proteomic data analysis, as existing gene expression techniques are not directly applicable.

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Navigating the Mass Spectrometry-Based Proteomic Data Using Free Computational Tools
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Navigating the Mass Spectrometry-Based Proteomic Data Using Free Computational Tools

Published on: August 19, 2025

Area of Science:

  • Proteomics
  • Statistics
  • Bioinformatics

Background:

  • Mass spectrometry is a key technology for global proteomic studies.
  • High-dimensional data from mass spectrometry requires advanced analytical methods.
  • Statistics provides essential tools for interpreting complex biological data.

Purpose of the Study:

  • To describe the data production process in mass spectrometry-based proteomics.
  • To outline the characteristics of proteomic data.
  • To detail analytical preprocessing steps for statistical analysis of proteomic data.

Main Methods:

  • Data acquisition and preprocessing in mass spectrometry.
  • Exploration of proteomic data characteristics.
  • Application of statistical methodologies for data interpretation.

Main Results:

  • Mass spectrometry generates high-dimensional proteomic data.
  • Standard statistical methods for gene expression data are not directly transferable to proteomics.
  • Specific areas requiring statistical research in proteomics were identified.

Conclusions:

  • Statistical approaches are vital for advancing global proteomic studies.
  • Further statistical research is necessary to address the unique challenges of proteomic data.
  • Key areas for statistical development include alignment, experimental design, normalization, and analysis.