Multiplexed Electrochemical Cancer Diagnostics With Automated Microfluidics

Area of Science:

• Biomedical Engineering
• Analytical Chemistry
• Biotechnology

Background:

• Microfluidic platforms offer miniaturization and increased throughput for biological assays.
• Automation is key to enhancing the efficiency and reproducibility of complex microfluidic protocols.
• Electrochemical detection provides a sensitive method for quantifying biomolecules.

Purpose of the Study:

• To automate a microfluidic platform for simultaneous electrochemical detection of multiple proteins.
• To demonstrate the platform's capability in analyzing complex biological samples.
• To develop a rapid and high-throughput screening method for cancer biomarkers.

Main Methods:

• Utilized a programmable Arduino microcontroller to automate a microfluidic system.
• Integrated inexpensive valve actuators, a pump, magnetic stirrer, and electronic display.
• Employed a multiplexed electrochemical immunoassay using magnetic particles and horseradish peroxidase.
• Developed a sandwich immunoassay protocol for protein capture and detection.

Main Results:

• Achieved automated, repeatable timing for complex assay steps, including sandwich immunoassays.
• Successfully detected eight proteins associated with prostate cancer simultaneously.
• Completed the multiplexed immunoassay protocol in under 30 minutes.
• Demonstrated the platform's utility in analyzing complex liquid samples.

Conclusions:

• The automated microfluidic platform simplifies and enhances high-throughput screening.
• This approach is suitable for detecting multiple biomarkers in patient samples.
• Programmable automation of microfluidics enables efficient and rapid multiplexed electrochemical immunoassays.