A highly efficient extraction protocol for magnetic particles on a digital microfluidic chip

作者：Vergauwe Nicolas; Vermeir Steven; Wacker Josias B; Ceyssens Frederik; Cornaglia Matteo; Puers Robert; Gijs Martin A M; Lammertyn Jeroen^*; Wittersaabios Daan

来源：Sensors and Actuators B: Chemical , 2014, 196: 282-291.

DOI：10.1016/j.snb.2014.01.076

• Digital microfluidics
• Electrowetting-on-dielectric
• Magnetic particles
• Immunoassay

We present a novel, simple and highly efficient protocol for the extraction of magnetic particles out of individual droplets on a digital lab-on-chip in the presence of a spatially fixed magnet with a permanent magnetic field. In this approach, the particles were extracted from the droplet by the interplay of capillary, magnetic and electrowetting forces, thereby avoiding the use of mechanical components that would be needed for removing the magnet when particle resuspension is required. This droplet manipulation allowed the execution of very efficient and fast washing protocols on the digital microfluidic (DMF) platform. To demonstrate the effectiveness of this particle extraction protocol, an IgG immunoassay was implemented on the DMF platform. Our improved protocol reduced the overall assay variability to 3% coefficient of variation (CV) while all incubation and washing steps were automatically performed on-chip. In addition, the suspended magnetic particles allowed the introduction of a very efficient mixing strategy by using the magnetic particles as magnetic stirrers, resulting in an improvement of 90% in detection limit compared to a passive mixing strategy, solely based on diffusion.

• 出版日期2014-6