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Related Concept Videos

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 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...
Peptide Identification Using Tandem Mass Spectrometry01:33

Peptide Identification Using Tandem Mass Spectrometry

Tandem mass spectrometry, also known as MS/MS or MS2, is an analytical technique that employs two mass analyzers. Essentially it is a series of mass spectrometers that helps isolate a particular biomolecule and then helps study its chemical properties.
This technique helps gather information regarding the protein from which the peptide was obtained and to study the peptides’ amino acid sequence. Identifying peptides from a complex mixture is an important component of the growing field of...
Mass Spectrometry: Molecular Fragmentation Overview01:20

Mass Spectrometry: Molecular Fragmentation Overview

The ionization of a molecule into a molecular ion inside the mass spectrometer causes instability in the molecule's structure due to the loss of an electron. This eventually leads to the fragmentation or breaking of some bonds in the molecule. The fragmentation occurs predominantly at specific bonds to yield relatively stable fragments.
One type of fragmentation pattern is the cleavage of a single bond in the molecular ion. The cleavage leads to a radical and a cation. The cleavage can occur at...
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...

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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

Label-free, normalized quantification of complex mass spectrometry data for proteomic analysis.

Noelle M Griffin1, Jingyi Yu, Fred Long

  • 1Proteogenomics Research Institute for Systems Medicine, San Diego, California, USA.

Nature Biotechnology
|December 17, 2009
PubMed
Summary

We developed a normalized, label-free quantitative method (SI(N)) to improve shotgun proteomic profiling. This method enhances quantitative reproducibility and protein abundance prediction in complex biological samples.

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Quantitative Analysis of Chromatin Proteomes in Disease
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Quantitative Analysis of Chromatin Proteomes in Disease

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Navigating the Mass Spectrometry-Based Proteomic Data Using Free Computational Tools
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Quantitative Analysis of Chromatin Proteomes in Disease
08:11

Quantitative Analysis of Chromatin Proteomes in Disease

Published on: December 28, 2012

Area of Science:

  • Proteomics
  • Quantitative Biology
  • Biomarker Discovery

Background:

  • Shotgun proteomic profiling using replicate mass spectrometry (MS) measurements and multiple analytical methods enhances data comprehensiveness.
  • Inherent biases and variations in proteomic data pose computational and statistical challenges for quantitative comparative analysis.

Purpose of the Study:

  • To develop and test a normalized, label-free quantitative method to address challenges in comparative proteomic analysis.
  • To improve the accuracy and reproducibility of protein quantification in complex biological samples.

Main Methods:

  • Developed and tested the normalized spectral index (SI(N)), a label-free quantitative method.
  • SI(N) combines peptide count, spectral count, and fragment-ion (tandem MS or MS/MS) intensity.
  • Validated the method using comparative immunoblotting and densitometry.

Main Results:

  • SI(N) largely eliminated variances between replicate MS measurements, enabling quantitative reproducibility.
  • The method allowed highly significant quantification of thousands of proteins.
  • SI(N) demonstrated superior accuracy in predicting protein abundance compared to five other tested methods.

Conclusions:

  • The normalized spectral index (SI(N)) offers a robust approach for quantitative comparative analysis of shotgun proteomics data.
  • This method facilitates reproducible quantification and accurate protein abundance prediction, crucial for systems biology and biomarker discovery.