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Method to Determine the Optimal Aptamer-to-Bead Ratio by Using Flow Cytometry.

Sun Young Lee1,2, Eun-Ok Kim3, Daehyuk Jang1,2

  • 1Lab of Functional Aptamer, Department of Bioindustry and Bioresource Engineering, College of Life Sciences, Sejong University, Seoul, Republic of Korea.

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|July 20, 2023
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Summary

This study introduces a flow cytometry method to find the best aptamer-to-bead ratio for immobilization. The optimal ratio of 1.28 × 10^5 aptamers per bead maximizes target binding efficiency.

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Area of Science:

  • Biotechnology
  • Bioconjugation Chemistry
  • Analytical Chemistry

Background:

  • Effective aptamer immobilization on beads is crucial for various applications but remains challenging.
  • Current methods for optimizing aptamer-to-bead ratios are limited.

Purpose of the Study:

  • To develop and validate a novel flow cytometry-based method for determining the optimal aptamer-to-bead ratio.
  • To identify the ideal ratio for maximizing aptamer binding efficiency to targets.

Main Methods:

  • Utilized flow cytometry to analyze fluorescence intensity correlating with aptamer immobilization.
  • Employed fluorescence microscopy for complementary visualization.
  • Quantified free aptamer concentration post-conjugation.
  • Assessed target binding efficiency at different aptamer-to-bead ratios.

Main Results:

  • Fluorescence intensity peaked at an aptamer-to-bead ratio of 2.56 × 10^5.
  • Optimal target binding efficiency was achieved at a ratio of 1.28 × 10^5 aptamers per bead.
  • Significant aptamer loss was observed at higher ratios compared to the optimal binding ratio.

Conclusions:

  • The proposed flow cytometry method offers a simple and effective approach for optimizing aptamer immobilization.
  • The optimal aptamer-to-bead ratio of 1.28 × 10^5 is critical for maximizing the binding performance of aptamer-functionalized beads.