A compact microfluidic chip with integrated impedance biosensor for protein preconcentration and detection.
Tuan Vu Quoc1, Meng-Syuan Wu2, Tung Thanh Bui3
1Institute of Applied Physics and Scientific Instrument, Vietnam Academy of Science and Technology, Hanoi, Vietnam.
Biomicrofluidics
|November 1, 2017
Summary
A novel biochip uses gold nanoparticles to trap proteins for detection. Impedance measurements confirm protein presence, validating this low-cost diagnostic system.
Area of Science:
- Biotechnology
- Nanotechnology
- Electrical Engineering
Background:
- Protein detection is crucial for diagnostics.
- Existing methods can be costly and complex.
- Microfluidic devices offer potential for sensitive detection.
Purpose of the Study:
- To design and fabricate a low-cost, compact biochip for protein detection.
- To utilize nanofractures for creating a protein trapping zone.
- To implement an impedance measurement module for quantifying protein presence.
Main Methods:
- Fabrication of a biochip with self-assembled gold nanoparticles.
- Application of ion enrichment and depletion via electroosmotic flow.
- Impedance measurement using a lock-in amplifier technique.
- Monitoring impedance changes during antibody growth on gold electrodes.
Main Results:
- Successful creation of a protein trapping zone using nanofractures.
- Detection of impedance changes correlated with trapped proteins.
- Distinguishable impedance profiles before and after protein presence.
- Validation of the system's performance in detecting proteins.
Conclusions:
- The developed biochip offers a low-cost and compact solution for protein detection.
- The nanofracture-based trapping mechanism is effective for concentrating proteins.
- Impedance measurement is a viable method for confirming protein presence in the biochip.
