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An Electrochemiluminescence-Based Assay for MeCP2 Protein Variants
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Electrochemiluminescence immunoassay using ionic-liquid submicron particles for prostate-specific antigen

Aki Tanaka1, Yuki Kiguchi1, Shigehiko Takegami2

  • 1Laboratory of Analytical Chemistry, Kyoto Pharmaceutical University, 5 Misasaginakauchi-cho, Yamashina-ku, Kyoto, 607-8414, Japan.

Analytical Sciences : the International Journal of the Japan Society for Analytical Chemistry
|February 20, 2025
PubMed
Summary

Ionic-liquid submicron particles (ILSPs) encapsulating a luminophore were developed for electrochemiluminescence immunoassays (ECLIA). These ILSPs enable easy quantitative determination of prostate-specific antigen (PSA) concentrations.

Keywords:
Electrochemiluminescence immunoassayIonic liquid submicron particleProstate-specific antigen[Ru(bpy)3]2+

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Biochemistry

Background:

  • Electrochemical immunoassays offer sensitive detection methods.
  • Development of novel carriers is crucial for enhancing assay performance.
  • Ionic liquids (ILs) present unique properties for electrochemical applications.

Purpose of the Study:

  • To develop ionic-liquid submicron particles (ILSPs) as carriers for electrochemiluminescence immunoassays (ECLIA).
  • To investigate the quantitative determination of prostate-specific antigen (PSA) using ILSPs in ECLIA.
  • To evaluate different ionic liquids and surfactants for optimal ILSP formulation.

Main Methods:

  • Synthesis of ILSPs encapsulating tris(2',2-bipyridyl)ruthenium (II) ([Ru(bpy)3]2+) using selected ionic liquids and surfactants.
  • Characterization of ILSPs, including particle size, zeta potential, and morphology.
  • Application of ILSPs in ECLIA for PSA determination, measuring electrochemiluminescence intensity.

Main Results:

  • ILSPs successfully encapsulated the [Ru(bpy)3]2+ luminophore.
  • 1-butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide ([BMIM][TFSA]) based ILSPs exhibited superior stability and performance.
  • A linear relationship was observed for PSA quantification (100 pg/mL–100 µg/mL) with a limit of detection of 544 pg/mL.

Conclusions:

  • ILSPs serve as effective carriers for ECLIA, facilitating PSA detection.
  • The developed ECLIA method using ILSPs offers a simple and sensitive approach for PSA quantification.
  • This study demonstrates the potential of ILSPs in advanced immunoassay development.