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Related Experiment Video

Updated: Oct 31, 2025

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SARS-CoV-2 Peptide Bioconjugates Designed for Antibody Diagnostics.

Ivan M Ryzhov1, Alexander B Tuzikov1, Alexey V Nizovtsev1

  • 1Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Science, Moscow 117997, Russian Federation.

Bioconjugate Chemistry
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Summary

This study compares three methods for detecting COVID-19 antibodies using peptide antigens. Function-spacer-lipid (FSL) conjugates showed higher performance, especially in erythrocyte-based assays, for accurate serologic testing.

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Area of Science:

  • Immunology
  • Bioconjugation Chemistry
  • Analytical Chemistry

Background:

  • High demand for COVID-19 antibody testing necessitates efficient and accurate serologic assays.
  • Peptide antigens are crucial for developing diverse analytical methods for antibody detection.
  • Existing methods require optimization for large-scale antibody testing.

Purpose of the Study:

  • To compare three distinct bioassay variations for detecting SARS-CoV-2 specific immunoglobulins.
  • To evaluate the performance of function-spacer-lipid (FSL) and peptide-polyacrylamide (peptide-PAA) bioconjugates.
  • To assess the utility of erythrocyte-based and enzyme immunoassay (EIA) formats.

Main Methods:

  • Synthesis of FSL and peptide-PAA bioconjugates using SARS-CoV-2 spike protein peptides.
  • Incorporation of FSL constructs into erythrocytes and lipid bilayers for serologic testing.
  • Immobilization of peptide-PAA conjugates onto microplates for EIA development.
  • Comparison of assay performance using defined antigen-antibody interactions.

Main Results:

  • FSL bioconjugates were successfully synthesized and incorporated into erythrocytes and lipid bilayers.
  • Peptide-PAA conjugates were synthesized and immobilized onto microplates via polymer physisorption.
  • FSL conjugates demonstrated superior performance, particularly in the erythrocyte-based serologic assay.
  • EIA formats using both FSL and peptide-PAA constructs were established and compared.

Conclusions:

  • FSL bioconjugates offer enhanced performance for detecting COVID-19 antibodies, especially in erythrocyte-based assays.
  • The FSL construct facilitates efficient bioconjugation and integration into various assay platforms.
  • Optimized peptide bioconjugates are vital for scalable and accurate SARS-CoV-2 serologic testing.