Pump-free and high-throughput generation of monodisperse hydrogel beads by microfluidic step emulsification for dLAMP-on-a-chip
bioRxiv, ISSN: 2692-8205
2023
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Pump-free and high-throughput generation of monodisperse hydrogel beads by microfluidic step emulsification for dLAMP-on-a-chip
2023 MAR 23 (NewsRx) -- By a News Reporter-Staff News Editor at NewsRx COVID-19 Daily -- According to news reporting based on a preprint abstract,
Article Description
Step emulsification (SE), which generates droplets by a sharp change in confinement, has emerged as a potential alternative to flow-focusing technology. Water/dispersed phase is continuously pumped through a shallow inlet channel into a deep chamber pre-filled with the oil/continuous phase. The need for one or more pumps to maintain a continuous flow for droplet generation, and the consequent use of high sample volumes, limit this technique to research labs. Here, we report a pump-free SE technique for rapid and high-throughput generation of monodisperse hydrogel (agarose) beads using <40 μl sample volume. Instead of using syringe pumps, we sequentially pipetted oil and liquid agarose into a microfluidic SE device to generate between 20000 and 80000 agarose beads in ~ 2 min. We also demonstrated the encapsulation of loop-mediated isothermal amplification mixture inside these beads at the time of their formation. Finally, using these beads as reaction chambers, we amplified nucleic acids from P. falciparum and SARS-CoV-2 inside them. The pump-free operation, tiny sample volume, and high-throughput generation of droplets by SE make our technique suitable for point-of-care diagnostics.
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