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Development of Fluorescence-Based Method for Dopamine Determination Using o-Phthaldialdehyde and
Valeriia Sliesarenko1,2, Marijana Krstić2, Urban Bren1,2,3
1Institute for Environmental Protection and Sensors, IOS Ltd., 7 Beloruska Str., SI-2000 Maribor, Slovenia.
Sensors (Basel, Switzerland)
|April 28, 2025
Summary
This study introduces a new dopamine sensor using o-Phthaldialdehyde (OPA) and 3-mercaptopropyltriethoxysilane (MPTES). The sensor shows a linear response to dopamine, enabling sensitive detection for biochemical research.
Area of Science:
- Nanomaterials and sensor technology
- Biochemical analysis and diagnostics
Background:
- Nanomaterials and sensors are crucial for advancements in medical diagnostics and biochemical research.
- Developing sensitive and responsive sensors is key to improving analytical techniques.
Purpose of the Study:
- To explore the use of o-Phthaldialdehyde (OPA) and 3-mercaptopropyltriethoxysilane (MPTES) for creating a dopamine-responsive sensor.
- To optimize reaction parameters, including pH and material ratios, for enhanced fluorescence intensity.
Main Methods:
- Investigated the combination of OPA and MPTES for sensor development.
- Systematically varied pH and OPA/MPTES ratios to determine optimal sensing conditions.
- Measured fluorescence intensity at specific excitation/emission wavelengths (340/460 nm).
Main Results:
- A linear correlation was observed between OPA/MPTES fluorescence response and dopamine concentration (0.1-3.0 µM) at pH 8.
- The sensor achieved a low detection limit of 8.7 nM for dopamine.
- Optimal parameters were identified for maximizing sensor sensitivity.
Conclusions:
- The OPA/MPTES system demonstrates significant potential as a sensing component for dopamine detection.
- This approach offers a promising method for sensitive and selective dopamine quantification.
- The developed sensor can be valuable for applications in medical diagnostics and biochemical research.
