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Related Concept Videos

Absolute Value Inequalities01:23

Absolute Value Inequalities

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The absolute value is a mathematical tool that represents the distance of a number from zero on the number line, regardless of its sign. In the context of inequalities, absolute value expressions help define a range of permissible values or boundaries for a variable. These inequalities are commonly used in scientific modeling and data interpretation, where variability within or beyond a certain threshold must be captured precisely.An absolute value inequality of the form ∣x∣ ≤...
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Selected Reaction Monitoring Mass Spectrometry for Absolute Protein Quantification
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Absolute Protein Quantification Using AQUA-Calibrated 2D-PAGE.

Sandra Maaß1

  • 1Department of Microbial Proteomics, Institute for Microbiology, University Greifswald, Greifswald, Germany. sandra.maass@uni-greifswald.de.

Methods in Molecular Biology (Clifton, N.J.)
|September 28, 2018
PubMed
Summary
This summary is machine-generated.

Accurate total protein measurement is crucial for absolute protein quantification. This study presents a ninhydrin-based assay for total protein determination and optimized protocols for mass spectrometry-based absolute protein quantification.

Keywords:
2D-PAGEAQUAAbsolute protein quantificationDigestionProteinProteomicsSelected reaction monitoringStable isotope dilution

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Area of Science:

  • Proteomics
  • Analytical Chemistry
  • Biochemistry

Background:

  • Absolute protein quantification is increasingly vital for understanding proteome dynamics.
  • Existing methods for single protein quantification in complex samples have limitations.
  • Accurate, protein-unspecific total protein determination is a critical need for these methods.

Purpose of the Study:

  • To describe a ninhydrin-based assay for accurate total protein determination.
  • To present optimized protocols for protein digestion for mass spectrometry-based absolute quantification.
  • To provide a comprehensive workflow for absolute protein quantification applicable to various scales.

Main Methods:

  • Development of a ninhydrin-based assay for total protein measurement.
  • Optimization and validation of protein digestion protocols for mass spectrometry.
  • Implementation of the AQUA strategy (absolute quantification) using stable isotope dilution and selected reaction monitoring (SID-SRM).
  • Integration of targeted mass spectrometry with two-dimensional polyacrylamide gel electrophoresis for large-scale quantification.

Main Results:

  • A validated ninhydrin-based assay for precise total protein quantification.
  • Optimized protein digestion protocols suitable for microbial soluble proteins.
  • A step-by-step guide for the AQUA strategy, including standard peptide selection and MS method development.
  • A combined workflow for large-scale absolute protein quantification.

Conclusions:

  • The developed ninhydrin assay addresses the need for accurate total protein measurement.
  • Optimized digestion protocols and the AQUA strategy facilitate reliable absolute protein quantification.
  • The presented workflows support both small- and large-scale absolute protein quantification efforts in scientific research.