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Label-free bead-based metallothionein electrochemical immunosensor.
Lukas Nejdl1,2, Hoai Viet Nguyen1,2, Lukas Richtera1,2
1Central European Institute of Technology, Brno University of Technology, Brno, Czech Republic.
Electrophoresis
|June 3, 2015
Summary
A new microfluidic immunosensor detects metallothionein (MT) without labels. This bead-based biosensor achieves sensitive MT detection in cancer patient samples, offering stable performance for several days.
Area of Science:
- Biomedical Engineering
- Analytical Chemistry
- Biosensor Technology
Background:
- Metallothionein (MT) is a protein biomarker implicated in various physiological processes and diseases, including cancer.
- Accurate and sensitive detection of MT is crucial for early diagnosis and monitoring of certain cancers.
- Existing detection methods may lack the sensitivity, speed, or portability required for widespread clinical application.
Purpose of the Study:
- To design and develop a novel microfluidic, label-free, bead-based immunosensor for the sensitive detection of metallothionein (MT).
- To optimize the performance of the microfluidic chip for MT detection in both stationary and flow-through arrangements.
- To evaluate the applicability of the developed immunosensor for detecting elevated MT levels in patient samples.
Main Methods:
- Development of a microfluidic chip featuring a printed 3D structure with an amalgam-coated copper wire working electrode.
- Immobilization of polyclonal chicken IgY antibodies specific to MT onto protein A-coated superparamagnetic agarose beads via rabbit IgG.
- Utilizing the Brdicka reaction for electrochemical detection of MT within the microfluidic system.
- Optimization of detection parameters, including flow rates (0-1800 μL/min) in a flow-through system.
Main Results:
- The microfluidic immunosensor demonstrated label-free detection of MT.
- Detection limits were optimized to 30 ng/mL in a stationary system and improved to 12.5 ng/mL in a flow arrangement.
- The device successfully detected elevated MT levels (approx. 100 μg/mL) in samples from cancer patients.
- The constructed device exhibited stability for several days of operation in the flow arrangement without maintenance.
Conclusions:
- A novel microfluidic label-free bead-based immunosensor for MT detection has been successfully designed and fabricated.
- The developed system offers enhanced sensitivity and improved detection limits compared to stationary setups.
- The immunosensor shows promise for the clinical application in detecting elevated MT levels in cancer patient samples.
- The device's stability and label-free nature make it a potentially valuable tool for point-of-care diagnostics.
