Gold nanoparticle modified capacitive sensor platform for multiple marker detection

Area of Science:

• Biomedical Engineering
• Nanotechnology
• Cancer Diagnostics

Background:

• Early cancer detection is vital for patient prognosis.
• Biosensor technology offers a cost-effective, non-invasive approach for biomarker detection.
• Current methods require improvement in sensitivity and speed.

Purpose of the Study:

• To develop a highly sensitive nanoparticle-modified capacitive sensor for cancer biomarker detection.
• To optimize surface modification protocols using gold nanoparticles (Au-NPs) for enhanced signal transduction.
• To validate the sensor's capability for multiplexed detection of key cancer antigens.

Main Methods:

• Fabrication of an interdigitated electrode (IDE) transducer.
• Surface modification of the IDE with gold nanoparticles (Au-NPs) for signal amplification.
• Optimization using Interleukin-6 (IL-6) followed by detection of Carcinoembryonic antigen (CEA), human Epidermal Growth Factor Receptor (hEGFR), and Cancer Antigen 15-3 (CA15-3).

Main Results:

• Successful detection of CEA and hEGFR in the range of 20-1000 pg mL⁻¹.
• Detection of CA15-3 within the range of 10-200 U mL⁻¹.
• Achieved a five-fold increase in sensitivity compared to unmodified sensors.

Conclusions:

• The developed Au-NP-modified capacitive sensor demonstrates high sensitivity and specificity for multiple cancer biomarkers.
• This novel biosensor platform shows significant potential for early cancer diagnosis through blood analysis.
• The optimized protocol enables precise disease diagnostics with reduced time and cost.