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Related Concept Videos

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...

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Related Experiment Video

Updated: Jul 2, 2026

Mapping the Binding Site of an Aptamer on ATP Using MicroScale Thermophoresis
08:09

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Published on: January 7, 2017

Aptamer-based affinity chromatographic assays for thrombin.

Qiang Zhao1, Xing-Fang Li, Yuanhua Shao

  • 1Division of Analytical and Environmental Toxicology, Department of Laboratory Medicine and Pathology, University of Alberta, Edmonton, AB, Canada T6G 2G3.

Analytical Chemistry
|September 2, 2008
PubMed
Summary
This summary is machine-generated.

Two aptamers were used to develop affinity chromatography assays for thrombin detection. This method achieved sensitive and selective measurement of thrombin, even at trace levels, by improving preconcentration and using a sandwich assay.

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Last Updated: Jul 2, 2026

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Published on: January 9, 2026

Area of Science:

  • Biochemistry
  • Analytical Chemistry
  • Biotechnology

Background:

  • Thrombin is a key enzyme in coagulation.
  • Accurate detection of thrombin is crucial for diagnosing and monitoring coagulation disorders.
  • Existing methods for thrombin detection can be limited in sensitivity, selectivity, or require sample labeling.

Purpose of the Study:

  • To develop sensitive and selective affinity chromatographic assays for thrombin detection.
  • To utilize aptamers as affinity ligands for efficient thrombin capture and elution.
  • To establish a sandwich assay format for improved thrombin selectivity without labeling.

Main Methods:

  • Development of affinity chromatography using two distinct aptamers targeting different thrombin binding sites.
  • Optimization of elution conditions using NaClO4 for efficient thrombin recovery.
  • Implementation of a sandwich assay format with immobilized aptamers on monolithic columns.
  • Detection of thrombin using absorbance or fluorescence, with preconcentration for enhanced sensitivity.

Main Results:

  • Efficient capture and step elution of thrombin were achieved.
  • Detection limits for thrombin were improved to 0.1 nM through preconcentration.
  • A sandwich assay demonstrated enhanced selectivity for thrombin detection.
  • The need for labeling thrombin in samples was eliminated.
  • Immobilized aptamers on monolithic columns facilitated improved retention and detection of trace thrombin levels.

Conclusions:

  • Aptamer-based affinity chromatography provides a sensitive and selective method for thrombin detection.
  • The developed sandwich assay format offers advantages in specificity and simplifies sample preparation.
  • This approach holds promise for clinical diagnostics and biochemical research requiring accurate thrombin quantification.