Integrated lab-on-chip biosensing systems based on magnetic particle actuation--a comprehensive review

Area of Science:

• Biomedical Engineering
• Microfluidics
• Diagnostic Technologies

Background:

• Growing demand for accessible, cost-effective medical technologies drives innovation in point-of-care diagnostics.
• Lab-on-chip (LOC) technologies are crucial for rapid, sensitive, quantitative, and miniaturized in vitro diagnostic testing.
• Integration of all assay steps, from sample introduction to result generation, is essential for effective LOC devices.

Purpose of the Study:

• To review the application of magnetic particles for controlling various process steps in integrated lab-on-chip diagnostic assays.
• To explore how magnetic fields can actuate magnetic particles for diverse functions within microfluidic diagnostic systems.
• To highlight the potential for fully integrated, magnetically controlled biosensing assays.

Main Methods:

• Utilizing magnetic particles manipulated by external magnetic fields to perform key assay functions.
• Discussing methodologies for fluid mixing, analyte capture, concentration, transfer, and labeling using magnetic particles.
• Examining techniques for performing stringency, washing steps, and probing analyte biophysical properties.
• Differentiating between methods involving fluid flow and stationary microfluidics.

Main Results:

• Magnetic particles can effectively execute multiple critical steps in diagnostic assays, including mixing, capture, concentration, and washing.
• Both fluidic and non-fluidic (stationary) microfluidic approaches demonstrate the utility of magnetic particle manipulation.
• Integration of various magnetically actuated steps is feasible, paving the way for complex LOC assays.

Conclusions:

• Magnetic particle actuation is a powerful and versatile strategy for developing integrated lab-on-chip diagnostic systems.
• This approach supports the development of rapid, sensitive, and miniaturized point-of-care diagnostic devices.
• Future integrated biosensing assays can be fully controlled and optimized using magnetic forces.