Flow injection based microfluidic device with carbon nanotube electrode for rapid salbutamol detection

Area of Science:

• Electrochemistry
• Microfluidics
• Materials Science

Background:

• Beta-agonists like salbutamol require sensitive detection methods.
• Existing methods may lack the speed and sensitivity needed for certain applications.
• Microfluidic systems offer miniaturization and enhanced analytical capabilities.

Purpose of the Study:

• To develop a microfabricated flow injection device for in-channel electrochemical detection (ECD) of salbutamol.
• To integrate carbon nanotube (CNT) electrodes within a polydimethylsiloxane (PDMS) microfluidic system.
• To optimize the system for sensitive and rapid analysis of beta-agonists.

Main Methods:

• Fabrication of a microfluidic system using PDMS microchannels bonded to a glass substrate.
• Development of a working electrode with carbon nanotubes (CNTs) on a gold layer, and silver/platinum reference/auxiliary electrodes.
• Utilizing DC-sputtering and chemical vapor deposition (CVD) for electrode fabrication.
• Performing flow injection analysis with amperometric detection in the microchannel.

Main Results:

• Optimized flow rate, injection volume, and detection potential for current signal response.
• Achieved fast and highly sensitive detection of salbutamol.
• Evaluated analytical characteristics including sensitivity, repeatability, and dynamic range.

Conclusions:

• The developed microfluidic device with CNT electrodes provides a powerful platform for beta-agonists detection.
• This miniaturized lab-on-a-chip system demonstrates high performance for salbutamol analysis.
• The combination of efficient electrodes and microfluidics enhances analytical capabilities.