Multiplex measurement of seven tumor markers using an electrochemical protein chip

Area of Science:

• Biomedical Engineering
• Analytical Chemistry
• Biosensor Technology

Background:

• Current tumor marker detection often involves single-analyte assays.
• There is a need for efficient, cost-effective, and high-throughput diagnostic tools.

Purpose of the Study:

• To develop and evaluate an electrochemical immunosensor for simultaneous multianalyte detection of tumor markers.
• To assess the performance of the sensor compared to traditional methods.

Main Methods:

• Fabrication of an array of immunosensing electrodes on a glass substrate.
• Immobilization of specific antigens on each electrode for competitive immunoassay.
• Electrochemical detection of seven key tumor markers: AFP, ferritin, CEA, hCG-beta, CA 15-3, CA 125, and CA 19-9.

Main Results:

• The immunosensor demonstrated excellent precision and accuracy for multianalyte measurements.
• Performance was comparable to single-analyte ELISAs, with low interassay coefficients of variation (1.9-8.1%).
• Achieved detection limits below 2 ng/mL (or units/mL) for most analytes.

Conclusions:

• Multianalyte assays using this chip-based sensor offer significant advantages in cost, labor, and throughput.
• The developed sensor is suitable for mass production of miniaturized, economical lab-on-a-chip devices.
• Potential applications span clinical diagnostics, environmental monitoring, and biodefense.