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Related Concept Videos

Quantitative Analysis01:12

Quantitative Analysis

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Quantitative analysis is a technique for measuring the amount of specific constituents in a sample. When the sample's composition is unknown, qualitative analysis is performed first to identify its components, which ensures that the correct substances are measured during the quantitative phase.
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The receptor occupancy theory connects a drug's response to the number of occupied receptors. With higher drug concentrations, more receptors are occupied, leading to increased responses. The formation of drug-receptor complexes involves association and dissociation rates, which reach equilibrium when the forward and backward reactions are equal. The equilibrium association constant (Ka) and its inverse, the equilibrium dissociation constant (Kd), indicate drug affinity. Higher Ka and lower...
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Carbon dioxide fixation in prokaryotes enables the assimilation of inorganic carbon into organic molecules, supporting biosynthetic pathways, sustaining ecosystems, and contributing to the global carbon cycle. It also has industrial applications in carbon capture and bioproduct synthesis. Autotrophic organisms rely on this process to utilize CO₂ as a carbon source in diverse environments.The Calvin CycleThe Calvin cycle is the most widespread carbon fixation mechanism, primarily used by...
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Carbon Dioxide Transport in the Blood01:19

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The back muscles that lie deep into the thoracolumbar fascia are called intrinsic or true back muscles. These muscles are divided into four layers: superficial, intermediate, deep, and deepest layers.
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The stability and compatibility of column material with samples are crucial for efficient purification in chromatographic techniques. Various operating parameters such as pH, temperature, or solvent affect the packing of the column material, thereby determining the purification efficiency. The choice of column material also plays an essential role in deciding the operating parameters and can be modified based on the proteins that need to be purified.
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Related Experiment Video

Updated: Jan 26, 2026

Phosphopeptide Enrichment Coupled with Label-free Quantitative Mass Spectrometry to Investigate the Phosphoproteome in Prostate Cancer
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Quantitative Phosphoproteomic Using Titanium Dioxide Micro-Columns and Label-Free Quantitation.

Martin E Barrios-Llerena1, Thierry Le Bihan2

  • 1Proteomics and Mass Spectrometry, Bioscience Core Labs, King Abdullah University of Science and Technology, Thuwal, Saudi Arabia. martin.barriosllerena@kaust.edu.sa.

Methods in Molecular Biology (Clifton, N.J.)
|April 14, 2019
PubMed
Summary

This study presents a label-free quantitative analysis protocol for phosphopeptides. The method utilizes titanium dioxide micro-columns for enrichment, offering an alternative to label-based quantitation.

Keywords:
Label-free quantitationMass spectrometryPhosphopeptide enrichmentTitanium dioxide chromatography (TiO2)

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Area of Science:

  • Proteomics
  • Cellular Biology
  • Biochemistry

Background:

  • Phosphorylation is a critical post-translational modification regulating cellular functions.
  • Analyzing phosphoproteins in complex biological samples is essential for understanding cellular signaling.
  • Existing quantitative methods often rely on label-based approaches.

Purpose of the Study:

  • To describe a protocol for quantitative analysis of phosphopeptides.
  • To present an intensity-based label-free quantitation method for phosphopeptides.
  • To offer an alternative to label-based quantitative strategies.

Main Methods:

  • Phosphopeptide enrichment using titanium dioxide (TiO2) micro-columns.
  • Quantitative analysis via intensity-based label-free quantitation (iBFQ).
  • Mass spectrometry-based proteomics.

Main Results:

  • Successful enrichment of phosphopeptides from complex samples.
  • Demonstration of quantitative analysis using the label-free approach.
  • Comparison of label-free quantitation with traditional label-based methods (implied).

Conclusions:

  • The described protocol provides a viable label-free method for phosphopeptide quantitation.
  • Titanium dioxide enrichment combined with iBFQ is effective for phosphoproteomic studies.
  • This approach simplifies quantitative phosphoproteomics.