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Related Experiment Video

Updated: Jul 20, 2026

Primer-Free Aptamer Selection Using A Random DNA Library
11:14

Primer-Free Aptamer Selection Using A Random DNA Library

Published on: July 26, 2010

FluMag-SELEX as an advantageous method for DNA aptamer selection.

R Stoltenburg1, C Reinemann, B Strehlitz

  • 1Department of Environmental Biotechnology, Centre for Environmental Research Leipzig-Halle GmbH (UFZ), Permoserstr. 15, 04318 Leipzig, Germany.

Analytical and Bioanalytical Chemistry
|July 30, 2005
PubMed
Summary

Researchers developed FluMag-SELEX, a modified aptamer selection process using fluorescent labels and magnetic beads. This method efficiently selects high-affinity DNA aptamers for biosensor applications, avoiding radioactive labeling.

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Area of Science:

  • Biotechnology
  • Molecular Biology
  • Biosensor Technology

Background:

  • Aptamers are single-stranded DNA or RNA oligonucleotides with high affinity, selectivity, and specificity for their targets due to their unique 3D structures.
  • The traditional Systematic Evolution of Ligands by Exponential Enrichment (SELEX) process is used for aptamer development.

Purpose of the Study:

  • To present a modified SELEX method, termed FluMag-SELEX, for developing aptamers.
  • To enable the selection of DNA aptamers for targets with diverse properties and sizes.
  • To apply these aptamers as novel biosensor receptors.

Main Methods:

  • Modification of the SELEX process using fluorescent labels for DNA quantification.
  • Utilizing magnetic beads for target immobilization, enabling easy handling, reduced target quantity, efficient separation, and stringent washing.
  • Selection of streptavidin-specific aptamers using the developed FluMag-SELEX technique.

Main Results:

  • FluMag-SELEX avoids radioactive labeling, offering a safer and more efficient alternative.
  • The method allows for the selection of aptamers against various targets.
  • Successful selection of streptavidin-specific aptamers was achieved.

Conclusions:

  • FluMag-SELEX provides a robust methodological background for aptamer selection.
  • The selected streptavidin-specific aptamers can be utilized to assess surface occupancy on streptavidin-coated magnetic beads.
  • This technique facilitates the development of aptamer-based biosensors.