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Solid-phase electrochemical enzyme immunoassay with attomole detection limit by flow injection analysis.
Y Xu1, H B Halsall, W R Heineman
1Department of Chemistry, University of Cincinnati, OH 45221-0172.
Journal of Pharmaceutical and Biomedical Analysis
|January 1, 1989
Summary
A novel sandwich electrochemical immunoassay detects mouse IgG using alkaline phosphatase. This sensitive method offers a low detection limit and wide dynamic range for antigen quantification.
Area of Science:
- Analytical Chemistry
- Biochemistry
- Immunotechnology
Background:
- Development of sensitive and efficient immunoassays is crucial for disease diagnostics.
- Electrochemical detection offers advantages in sensitivity and cost-effectiveness for immunoassays.
Purpose of the Study:
- To develop a sandwich electrochemical enzyme immunoassay for quantifying mouse IgG.
- To optimize and characterize the performance of the developed immunoassay system.
Main Methods:
- Utilized alkaline phosphatase as an enzyme label for signal amplification.
- Employed flow injection analysis with electrochemical detection (FIAEC) for high-throughput analysis.
- Investigated electrochemical properties of enzyme substrate and product using cyclic and hydrodynamic voltammetry.
Main Results:
- Achieved a detection limit of 2.4 x 10(-8) M for 4-aminophenol.
- Demonstrated a linear range of 5.0 x 10(-8) to 1.0 x 10(-5) M for 4-aminophenol determination.
- Quantified mouse IgG with a detection limit of 0.81 pg ml-1 and a six-order linear dynamic range.
Conclusions:
- The developed sandwich electrochemical immunoassay is highly sensitive and suitable for mouse IgG detection.
- FIAEC with electrochemical detection provides an efficient platform for immunoassay analysis.
- The method shows potential for various applications requiring precise antigen quantification.