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Related Concept Videos

Size-Exclusion Chromatography01:08

Size-Exclusion Chromatography

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.
Silica particles offer advantages such as rigidity,...
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...
Affinity Chromatography01:03

Affinity Chromatography

Affinity chromatography is a powerful technique extensively utilized for separating and purifying specific biomolecules from complex mixtures. It capitalizes on the highly selective binding between an analyte and its counterpart, such as antibody-antigen interactions. The counterpart is immobilized on the stationary phase, forming an affinity column. The stationary phase typically consists of solid support, such as agarose or porous glass beads, immobilizing the affinity ligand. The mobile...
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...
Dialysis01:15

Dialysis

Dialysis is a diffusion-based purification process that separates analyte molecules from a complex matrix. This is accomplished by allowing molecules in the solution to pass through a semipermeable membrane into a liquid on the other side. The membrane is usually made of cellulose acetate or cellulose nitrate, and the second liquid must be miscible with the solution. Ions (e.g., chloride or sodium) or organic molecules (e.g., glucose) can pass through the membrane pores, which generally have...
Capillary Electrophoresis: Applications01:30

Capillary Electrophoresis: Applications

Capillary electrophoretic separations offer various modes, each with unique applications. These modes include capillary zone electrophoresis, capillary gel electrophoresis, capillary array electrophoresis, capillary isoelectric focusing, capillary isotachophoresis, micellar electrokinetic chromatography, and capillary electrochromatography.
Capillary zone electrophoresis (CZE) separates ionic components based on their electrophoretic mobility. It has been used to separate proteins, amino acids,...

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Related Experiment Video

Updated: Jun 8, 2026

Separation of Single-stranded DNA, Double-stranded DNA and RNA from an Environmental Viral Community Using Hydroxyapatite Chromatography
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Separation of Single-stranded DNA, Double-stranded DNA and RNA from an Environmental Viral Community Using Hydroxyapatite Chromatography

Published on: September 29, 2011

Unique selectivity windows using selective displacers/eluents and mobile phase modifiers on hydroxyapatite.

Christopher J Morrison1, Pete Gagnon, Steven M Cramer

  • 1Department of Chemical and Biological Engineering, Center for Biotechnology and Interdisciplinary Studies, Rensselaer Polytechnic Institute, 110 8th Street, Troy, NY 12180, USA.

Journal of Chromatography. A
|September 14, 2010
PubMed
Summary

Researchers combined ceramic hydroxyapatite (CHA) selectivity with displacement chromatography for enhanced protein separation. This novel method precisely targets interactions, achieving baseline separations for previously unresolved protein pairs.

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Area of Science:

  • Biochemistry and analytical chemistry, focusing on chromatographic separation techniques.

Background:

  • Ceramic hydroxyapatite (CHA) offers unique selectivity but requires optimized separation methods.
  • Selective displacement chromatography is a powerful technique for complex mixture resolution.

Purpose of the Study:

  • To combine the selectivity of ceramic hydroxyapatite (CHA) with selective displacement chromatography for improved protein separation.
  • To develop novel displacers and mobile phase modifiers for enhanced chromatographic resolution.
  • To establish new separation windows unattainable by traditional methods.

Main Methods:

  • Utilized a robotic liquid handling system for parallel batch screening of a displacer library.
  • Incorporated diverse functional groups (charged, chelating, hydrogen bonding) into displacer design.
  • Investigated the impact of mobile phase modifiers (phosphate, sulfate, lactate, borate) on separation selectivity.
  • Performed column chromatography using optimized selective displacers and mobile phase modifiers.

Main Results:

  • Achieved selective batch separations of protein pairs unresolvable by linear gradient techniques.
  • Demonstrated that specific interaction moieties on displacers dictate selective protein displacement.
  • Showcased the synergistic role of mobile phase modifiers in augmenting displacer selectivity.
  • Obtained baseline separation for previously unresolved protein pairs using column chromatography.
  • Reversed elution order while maintaining baseline separations, indicating precise control.

Conclusions:

  • Established a new class of chromatographic separations by integrating multi-modal resin, displacer, and mobile phase modifier selectivities.
  • Developed a powerful strategy for designing CHA displacers and optimizing mobile phases for targeted protein separation.
  • Created unique selectivity windows for complex protein mixture analysis, surpassing traditional chromatographic approaches.