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Related Concept Videos

Ion-Exchange Chromatography01:09

Ion-Exchange Chromatography

Ion-exchange chromatography, or IEC, is a technique for separating ions based on their affinity for the stationary phase. The stationary phase is a cross-linked polymer resin with covalently attached ionic functional groups. The functional groups can be either positively charged (cation exchangers) or negatively charged (anion exchangers). A cation exchanger consists of a polymeric anion and active cations, while an anion exchanger is a polymeric cation with active anions. The choice of...
Types Of Column Chromatography01:29

Types Of Column Chromatography

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...
Molecular Chaperones and Protein Folding03:00

Molecular Chaperones and Protein Folding

The native conformation of a protein is formed by interactions between the side chains of its constituent amino acids. When the amino acids cannot form these interactions, the protein cannot fold by itself and needs chaperones. Notably, chaperones do not relay any additional information required for the folding of polypeptides; the native conformation of a protein is determined solely by its amino acid sequence. Chaperones catalyze protein folding without being a part of the folded protein.
The...
Ion Exchange01:17

Ion Exchange

Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or basic...
Protein Folding01:25

Protein Folding

Proteins are chains of amino acids linked together by peptide bonds. Upon synthesis, a protein folds into a three-dimensional conformation, critical to its biological function. Interactions between its constituent amino acids guide protein folding, and hence the protein structure is primarily dependent on its amino acid sequence.
Protein Structure Is Critical to Its Biological Function
Proteins perform a wide range of biological functions such as catalyzing chemical reactions, providing...

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Related Experiment Video

Updated: Jun 8, 2026

Method for Efficient Refolding and Purification of Chemoreceptor Ligand Binding Domain
14:25

Method for Efficient Refolding and Purification of Chemoreceptor Ligand Binding Domain

Published on: December 12, 2017

Ion-exchange chromatographic protein refolding.

Esteban J Freydell1, Luuk van der Wielen, Michel Eppink

  • 1Department of Biotechnology, Delft University of Technology, Delft, The Netherlands.

Journal of Chromatography. A
|October 12, 2010
PubMed
Summary

Ion-exchange refolding (IExR) enhances protein recovery by optimizing spatial isolation and urea gradients. Understanding these factors allows for rational design of ion-exchange media for improved protein refolding yields.

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Ion Exchange Chromatography (IEX) Coupled to Multi-angle Light Scattering (MALS) for Protein Separation and Characterization
10:41

Ion Exchange Chromatography (IEX) Coupled to Multi-angle Light Scattering (MALS) for Protein Separation and Characterization

Published on: April 5, 2019

Related Experiment Videos

Last Updated: Jun 8, 2026

Method for Efficient Refolding and Purification of Chemoreceptor Ligand Binding Domain
14:25

Method for Efficient Refolding and Purification of Chemoreceptor Ligand Binding Domain

Published on: December 12, 2017

Ion Exchange Chromatography (IEX) Coupled to Multi-angle Light Scattering (MALS) for Protein Separation and Characterization
10:41

Ion Exchange Chromatography (IEX) Coupled to Multi-angle Light Scattering (MALS) for Protein Separation and Characterization

Published on: April 5, 2019

Area of Science:

  • Biotechnology
  • Biochemical Engineering
  • Protein Chemistry

Background:

  • Ion-exchange chromatography (IEX) is a powerful technique for protein refolding (IExR), offering process intensification through simultaneous refolding, purification, and concentration.
  • Key advantages of IExR include spatial isolation of bound proteins and controlled chemical environment manipulation via gradients.
  • Limited mechanistic understanding of IExR hinders optimization of process performance.

Purpose of the Study:

  • To quantitatively analyze the impact of spatial isolation and urea gradients on IExR performance, specifically refolding yield (Y(N)) and fractional mass recovery (f(Prot,Rec)).
  • To investigate the influence of protein load, loading state (native, denatured, D&R), and adsorbent type on fractional mass recovery.

Main Methods:

  • Quantitative analysis of IExR performance metrics (Y(N), f(Prot,Rec)).
  • Assessment of protein load, loading state, and adsorbent type effects on fractional mass recovery.
  • Correlation analysis between fractional surface coverage (θ) and f(Prot,Rec).
  • Estimation of urea gradient's impact on refolding yield using urea gradient slope (ξ).

Main Results:

  • Protein load directly affects fractional mass recovery, with magnitude dependent on protein loading state and adsorbent type.
  • Denatured proteins exhibit lower saturation capacity than native proteins due to reduced accessible binding surface area.
  • Fractional surface coverage (θ) strongly correlates with fractional mass recovery, serving as a descriptor for spatial isolation.
  • Urea gradient slope (ξ) quantitatively links urea gradients to variations in refolding yield.

Conclusions:

  • Spatial isolation and urea gradients are critical, quantifiable parameters influencing IExR efficiency.
  • Fractional surface coverage and urea gradient slope can guide the optimization of IExR processes.
  • Findings facilitate the rational design and selection of ion-exchange media for successful protein refolding.