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Oxygen optrode for use in a fiber-optic glucose biosensor.
M C Moreno-Bondi1, O S Wolfbeis, M J Leiner
1Analytical Division, Karl-Franzens University, Graz, Austria.
Analytical Chemistry
|November 1, 1990
Summary
A novel fiber-optic oxygen sensor utilizing ruthenium luminescence was developed. This oxygen sensor enables a highly sensitive glucose biosensor for real-time monitoring.
Area of Science:
- Biomedical Engineering
- Analytical Chemistry
- Materials Science
Background:
- Optical fiber sensors offer advantages in remote and continuous monitoring.
- Luminescence-based oxygen sensing provides high sensitivity and selectivity.
- Accurate glucose monitoring is crucial for diabetes management.
Purpose of the Study:
- To develop a fiber-optic oxygen sensor based on ruthenium luminescence.
- To create a sensitive and fast-responding fiber-optic glucose biosensor using the oxygen sensor as a transducer.
- To investigate the performance characteristics of the glucose biosensor.
Main Methods:
- Fabrication of an optical fiber oxygen sensor by adsorbing a ruthenium complex onto silica gel within a silicone matrix.
- Immobilization of enzymes onto the oxygen optrode surface, with carbon black for optical isolation.
- Continuous oxygen monitoring and glucose concentration measurements in a flow-through cell.
Main Results:
- The oxygen sensor demonstrated a detection limit as low as 0.7 Torr over a 0-750 Torr range.
- The fiber-optic glucose biosensor exhibited fast response times (around 6 min) and a wide analytical range (0.06-1 mM).
- Sensor construction showed good reproducibility and long-term stability.
Conclusions:
- The developed fiber-optic oxygen sensor is a highly sensitive transducer for oxygen monitoring.
- The integrated glucose biosensor offers a promising platform for rapid and accurate glucose detection.
- Further optimization of enzyme immobilization can enhance biosensor performance.