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An immunosensor based on the glucose oxidase label and optical oxygen detection
D B Papkovsky1, T C O'Riordan, G G Guilbault
1Biochemistry Department, National University of Ireland, Cork, Ireland. dbp@ucc.ie
Analytical Chemistry
|April 30, 1999
Summary
A new optical immunosensor detects oxidase enzymes with high sensitivity using a luminescence-based oxygen sensor. This versatile method achieves nanogram per milliliter detection levels for glucose oxidase and lactate dehydrogenase.
Area of Science:
- Biomedical Engineering
- Analytical Chemistry
- Biosensing Technology
Background:
- Immunoassays are crucial for detecting biomarkers.
- Existing methods like ELISA can be time-consuming and require significant sample volumes.
- Development of sensitive and rapid immunosensors is an ongoing area of research.
Purpose of the Study:
- To develop a novel optical immunosensor for sensitive enzyme detection.
- To utilize a luminescence lifetime-based oxygen sensor for enhanced signal transduction.
- To evaluate the performance and versatility of the developed immunosensor system.
Main Methods:
- An optical immunosensor was designed using glucose oxidase as a label.
- A luminescence lifetime-based oxygen sensor integrated with phase measurements was employed.
- Immunoassays were performed on oxygen sensor membranes as a solid phase.
- The system was optimized using IgG-anti-IgG and validated for lactate dehydrogenase detection.
Main Results:
- The immunosensor demonstrated high sensitivity for oxidase enzymes, reaching 10(-11)-10(-12) M (nanogram per milliliter level).
- Experimental sensitivity data were validated through theoretical calculations.
- The system achieved a sensitivity of approximately 1 ng/mL for human lactate dehydrogenase isoenzymes.
- Performance was comparable to standard ELISA methods.
Conclusions:
- The novel optical immunosensor offers high sensitivity and versatility for enzyme detection.
- The luminescence lifetime-based oxygen sensing approach provides a robust platform for immunoassays.
- This method presents a promising alternative to conventional immunoassay techniques for clinical diagnostics.