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Related Experiment Videos

Amperometric microcells for alkaline phosphatase assay.

Róbert E Gyurcsányi1, Andrea Bereczki, Géza Nagy

  • 1Joint Graduate Program in Biomedical Engineering, The University of Memphis, University of Tennessee Health Science Center, 38152, USA.

The Analyst
|March 27, 2002
PubMed
Summary

A novel hydrogel-coated electrode enables simple electrochemical immunoassays for alkaline phosphatase (ALP) and alpha-human IgG-ALP conjugates. This method offers reproducible results with reduced non-specific adsorption, using a stable substrate.

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Area of Science:

  • Electrochemistry
  • Biosensors
  • Immunoassays

Background:

  • Electrochemical immunoassays require sensitive and reproducible detection methods.
  • Alkaline phosphatase (ALP) is a commonly used enzyme label in immunoassays.
  • Minimizing non-specific adsorption is crucial for assay accuracy.

Purpose of the Study:

  • To develop a simple electrochemical immunoassay for determining alkaline phosphatase (ALP) and anti-human IgG conjugated ALP (alpha-hIgG-ALP).
  • To enhance electrode performance by using a hydrogel coating for reproducible, steady-state conditions and reduced non-specific adsorption.

Main Methods:

  • Utilized a screen-printed amperometric microcell with graphite working and Ag/AgCl reference electrodes.
  • Coated the working electrode surface with a mass-transport controlling hydrogel layer.

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  • Employed ascorbic acid 2-phosphate (AAP) as a stable and non-toxic enzyme substrate for measurements in the range of 2-4000 mU/ml.

    • Main Results:

    • Achieved linear kinetic response curves with hydrogel-coated electrodes.
    • Demonstrated reduced non-specific adsorption of the alpha-hIgG-ALP conjugate on the working electrode surface.
    • Obtained approximately 71% of the sensitivity achieved with p-aminophenylphosphate (PAPP) substrate, while maintaining consistent kinetic parameters.

    Conclusions:

    • The hydrogel-coated electrode provides a viable platform for simple and reproducible electrochemical immunoassays.
    • The developed method effectively determines ALP and alpha-hIgG-ALP activity with improved assay characteristics.
    • Ascorbic acid 2-phosphate (AAP) is a suitable substrate for this electrochemical immunoassay, offering stability and availability.