Low cost and massively parallel force spectroscopy with fluid loading on a chip.

Area of Science:

• Biophysics
• Molecular Mechanobiology
• Microfluidics

Background:

• Traditional single molecule force spectroscopy methods suffer from low throughput and high costs.
• There is a need for accessible and efficient techniques to study molecular mechanics.

Purpose of the Study:

• To demonstrate a low-cost, high-throughput microfluidic technique for single molecule force spectroscopy.
• To enable multiplexed mechanical manipulation of thousands of individual molecules simultaneously.

Main Methods:

• Development of the fluid loading on-a-chip (FLO-Chip) using serially connected microchannels of varying widths.
• Multiplexed mechanical manipulation of up to ~4000 individual molecules.
• Measurement of dissociation forces for Biotin-Streptavidin, Digoxigenin-AntiDigoxigenin, and DNA unzipping under varying dynamic loading rates.

Main Results:

• Successful demonstration of high-throughput, multiplexed single molecule force measurements using FLO-Chip.
• Rupture force data obtained under varied loading rates and solution conditions align with previous studies.
• FLO-Chip allows simultaneous testing at multiple loading rates within a single experiment.

Conclusions:

• FLO-Chip provides a versatile, rapid, low-cost, and portable approach for single molecule force spectroscopy.
• This technique broadens access to molecular force measurements and may enable novel applications in biophysics and mechanobiology.
• The microfluidic platform facilitates straightforward mechanical testing of single molecules.