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Related Concept Videos

Size-Exclusion Chromatography01:08

Size-Exclusion Chromatography

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In size-exclusion chromatography (SEC), also known as molecular-exclusion or gel-permeation chromatography, molecules are separated based on their sizes. This technique is important for separating large molecules such as polymers and biomolecules. The two classes of micron-sized stationary phases encountered in SEC are silica particles and cross-linked polymer resin beads. Both materials are porous, but their pore sizes vary significantly.
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Gas Chromatography: Types of Columns and Stationary Phases01:17

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Gas chromatography (GC) relies on stationary phases to separate and analyze components in a sample. There are two main types of stationary phases: liquid and solid. Liquid stationary phases are non-volatile, thermally stable, and chemically inert liquids coated onto the column. Solid stationary phases are particles of adsorbent material, such as silica gel or molecular sieves.
For an analyte to remain on the column for a sufficient amount of time, it must exhibit some level of compatibility (or...
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Types Of Column Chromatography01:29

Types Of Column Chromatography

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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.
Gel Filtration Chromatography
When the...
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Principles Of Column Chromatography01:13

Principles Of Column Chromatography

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The chromatography technique was first invented in 1901 by Michael S. Tswett, a Russian botanist, to separate plant pigments using organic solvents. Further, in 1941, Archer John Porter Martin and R. L. M. Synge modified the technique by packing silica gel into a column. A mixture of amino acids was then separated on the packed column using chloroform and water mixture as the mobile phase. This was the first report on column chromatography. At present, column chromatography is a widely used...
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Diffusion on Chromatography Columns01:07

Diffusion on Chromatography Columns

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In column chromatography, when an analyte is introduced as a narrow band at the top of the column, the solutes begin to separate and broaden, developing a Gaussian profile. This broadening occurs due to various factors, such as longitudinal diffusion.
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Silica Gel Column Chromatography: Overview01:10

Silica Gel Column Chromatography: Overview

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Silica gel column chromatography is a technique for separating compounds using a column packed with silica gel as the stationary phase. This method relies on differences in the polarity of compounds. Based on their polarities, compounds move between the stationary phase (silica gel) and the mobile phase (the solvent), forming discrete bands in the column.
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Rapid Assessment of Membrane Protein Quality by Fluorescent Size Exclusion Chromatography
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Rapid Assessment of Membrane Protein Quality by Fluorescent Size Exclusion Chromatography

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Size-exclusion chromatography using reverse-phase columns for protein separation.

Tung-Yung Huang1, Lang-Ming Chi2, Kun-Yi Chien3

  • 1Graduate Institute of Biomedical Sciences, College of Medicine, Chang Gung University, Taoyuan 333, Taiwan.

Journal of Chromatography. A
|August 28, 2018
PubMed
Summary
This summary is machine-generated.

This study demonstrates that reverse-phase chromatography columns can be used for size-based protein separation, similar to size-exclusion chromatography. This novel method improves protein fractionation and is compatible with mass spectrometry analysis.

Keywords:
Column efficiencyMass spectrometryProtein separationReverse-phase chromatographySize-exclusion chromatography

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Area of Science:

  • Analytical Chemistry
  • Biochemistry
  • Chromatography

Background:

  • Reverse-phase (RP) liquid chromatography (RPLC) and size-exclusion chromatography (SEC) are standard protein/peptide separation techniques.
  • These methods operate on fundamentally different separation principles.

Purpose of the Study:

  • To develop a novel method utilizing RP columns for size-based separation of protein mixtures.
  • To enable RP columns to function effectively as SEC columns.

Main Methods:

  • Utilized high concentrations of acetonitrile with trifluoroacetic acid in the mobile phase to suppress protein-stationary phase interactions.
  • Reduced protein disulfide bonds to improve the correlation between retention time and molecular weight.
  • Employed a salt-free mobile phase for direct coupling with online mass spectrometry (MS).
  • Optimized separation efficiency by adjusting flow rate and column length.

Main Results:

  • Achieved size-based separation of proteins using RP columns, mimicking SEC behavior.
  • Demonstrated improved correlation between retention time and molecular weight for disulfide-reduced proteins.
  • Successfully coupled the RP-based SEC system with online MS analysis due to the salt-free mobile phase.
  • Observed enhanced protein detection in a complex cell lysate compared to conventional SEC, indicating broader applicability.
  • Showcased improved separation efficiency with optimized flow rate and column length.

Conclusions:

  • RP-based SEC is a highly efficient method for protein fractionation.
  • The salt-free mobile phase ensures compatibility with other separation strategies and online MS.
  • This technique offers a seamless transition for laboratories already using RP-HPLC systems for protein separation.
  • The method shows potential as a first-dimensional separation technique in multi-dimensional LC systems.