Miniaturisation of a peptide-based electrochemical protease activity sensor using platinum microelectrodes

Area of Science:

• Electrochemistry
• Biomarker Detection
• Biosensor Technology

Background:

• Proteases are key biomarkers implicated in cancer progression and other diseases.
• Electrochemical peptide-based biosensors show promise but are limited by large electrode sizes.
• Microelectrodes offer advantages like faster response, better sensitivity, and localized measurements.

Purpose of the Study:

• To develop and characterize a miniaturized electrochemical biosensor for trypsin detection.
• To compare the performance of platinum microelectrodes against macroelectrodes and gold electrodes.
• To assess the sensor's suitability for clinical applications and implantable devices.

Main Methods:

• Fabrication and characterization of a miniaturized electrochemical biosensor using 25 μm diameter platinum microelectrodes.
• Benchmarking against platinum macroelectrodes to evaluate quantitative response, cleavage kinetics, and non-specific binding.
• Assessment of sensor performance, stability, and response under varying temperature conditions.

Main Results:

• Significant differences in sensor performance between platinum macroelectrodes and microelectrodes, indicating improved reproducibility and stability.
• Microelectrodes showed a decreased cleavage rate, which was mitigated at body temperature.
• The miniaturized platform demonstrated robustness and sensitivity within clinically relevant protease concentration ranges.

Conclusions:

• The developed miniaturized electrochemical biosensor is robust, sensitive, and reproducible.
• Platinum microelectrodes offer advantages over traditional macroelectrodes for protease detection.
• The sensor platform shows significant potential for translation into implantable diagnostic devices for disease monitoring.