A flexible carbon nanotube-modified poly(styrene-butadiene)-based dopamine sensor

Area of Science:

• Materials Science
• Electrochemistry
• Biomedical Engineering

Background:

• Dopamine (DA) detection is crucial for diagnosing neurological disorders and monitoring treatment.
• Existing detection methods often lack sensitivity, selectivity, or portability for real-time monitoring.
• Wearable electrochemical sensors offer a promising avenue for continuous and non-invasive dopamine monitoring.

Purpose of the Study:

• To develop a sensitive and selective electrochemical sensor for dopamine detection.
• To create a flexible sensor material suitable for wearable applications.
• To evaluate the sensor's performance in complex biological matrices like human serum.

Main Methods:

• Fabrication of a multi-walled carbon nanotube-modified flexible poly(styrene-butadiene) fiber membrane via electrospinning.
• Electrochemical characterization using differential pulse voltammetry.
• Testing the sensor's selectivity against common interfering substances like ascorbic acid and uric acid.
• Quantification of dopamine in human serum and DA injection samples.

Main Results:

• The developed sensor demonstrated sensitive and selective electrochemical detection of dopamine.
• A linear response for dopamine was observed in the concentration range of 1-650 μM with a high correlation coefficient (R² = 0.996).
• A low detection limit of 0.062 μM for dopamine was achieved, indicating high sensitivity.
• Effective minimization of interference from ascorbic acid and uric acid was confirmed.

Conclusions:

• The multi-walled carbon nanotube-modified flexible fiber membrane sensor is a viable platform for sensitive and selective dopamine detection.
• The sensor's flexibility and performance characteristics make it suitable for integration into wearable devices for real-time monitoring.
• This technology holds potential for improved diagnostics and management of conditions related to dopamine levels.