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High-performance liquid chromatographic postcolumn reaction detection based on a competitive binding system.

A Przyjazny1, T L Kjellström, L G Bachas

  • 1Department of Chemistry, University of Kentucky, Lexington 40506-0055.

Analytical Chemistry
|December 1, 1990
PubMed
Summary

This study introduces a novel postcolumn reaction method for high-performance liquid chromatography (HPLC) using competitive binding. This approach enhances the detection of biotin and biocytin, improving selectivity and sensitivity.

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Area of Science:

  • Analytical Chemistry
  • Chromatography
  • Biochemistry

Background:

  • Postcolumn reactions are crucial for enhancing detection in high-performance liquid chromatography (HPLC).
  • Developing novel reaction schemes can improve analytical method performance.
  • Competitive binding principles offer a potential avenue for designing advanced postcolumn reactions.

Purpose of the Study:

  • To design and validate a novel postcolumn reaction scheme for HPLC using competitive binding.
  • To apply this method for the sensitive and selective determination of biotin and biocytin.
  • To optimize the reaction conditions and evaluate the analytical performance.

Main Methods:

  • Utilized competitive binding principles with avidin-HABA complex in a postcolumn reaction setup.

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  • Integrated the postcolumn reaction with HPLC effluent and a reagent stream containing avidin and HABA.
  • Displacement of HABA by analytes (biotin, biocytin) was monitored via UV-vis detection at 345 nm.
  • Optimized parameters included reactor design, reagent concentrations, and flow rates.

    • Main Results:

    • The developed postcolumn reaction scheme successfully determined biotin and biocytin using HPLC.
    • The method demonstrated improved selectivity and sensitivity compared to direct detection at 220 nm.
    • Analytical characteristics were optimized, and performance was thoroughly evaluated.
    • Detection limits were maintained at levels comparable to direct detection methods.

    Conclusions:

    • Competitive binding principles are feasible for designing effective postcolumn reaction schemes in HPLC.
    • The novel postcolumn reaction enhances selectivity and sensitivity for biotin and biocytin detection.
    • This method offers a valuable alternative for improving analytical performance in chromatographic separations.