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Related Experiment Videos

Amperometric detection in TMB/HRP-based assays.

Pablo Fanjul-Bolado1, María Begoña González-García, Agustín Costa-García

  • 1Departamento de Química Física y Analítica, Universidad de Oviedo, 33006, Oviedo, Asturias, Spain.

Analytical and Bioanalytical Chemistry
|May 14, 2005
PubMed
Summary

3,3

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Area of Science:

  • Electrochemistry
  • Biochemistry
  • Analytical Chemistry

Background:

  • 3,3',5,5'-Tetramethylbenzidine (TMB) is a common chromogen for horseradish peroxidase (HRP).
  • Evaluating TMB's electrochemical substrate performance is crucial for sensitive detection methods.

Purpose of the Study:

  • To assess the electrochemical performance of 3,3',5,5'-Tetramethylbenzidine (TMB) as a substrate for horseradish peroxidase (HRP).
  • To develop a sensitive amperometric detection method for HRP activity using TMB.
  • To demonstrate the applicability of this method in Enzyme-Linked Immunosorbent Assays (ELISAs).

Main Methods:

  • Amperometric detection coupled with flow injection analysis (FIA).
  • Utilized a bare screen-printed electrode in a homemade electrochemical flow cell.
  • Optimized detection potential and flow rate (0.5 M H2SO4 at 4.3 mL min(-1)).

Main Results:

  • Achieved a low detection limit of 2x10(-14) M for HRP after 15 min incubation.
  • Demonstrated easy detection of the enzymatic product at +0.1 V.
  • Successfully applied the method to quantify interleukin-6 (IL-6) in a commercial ELISA kit without protocol modification.

Conclusions:

  • TMB is a highly effective electrochemical substrate for HRP detection.
  • The developed amperometric FIA method offers high sensitivity and short analysis times.
  • This approach is suitable for routine ELISA applications, enhancing diagnostic capabilities.

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