Magnetic-based purification system with simultaneous sample washing and concentration

摘要

Simultaneous washing and concentration of magnetic microparticles was demonstrated using a rotational magnetic system under a continuous-flow condition. The rotation of periodically arranged permanent magnets close to a fluidic channel carrying a suspension of magnetic particles allows the trapping and releasing of particles along the fluidic channel in a periodic manner. Each trapping and releasing event resembles one washing cycle in conventional biological assays. Concentration efficiencies of 99.75±0.083 at a flow rate of 200 μl/min and 88.10±3.17 at a flow rate of 1,000 μl/min and a purification efficiency of 99.10±4.3 at a flow rate of 900 μl/min were achieved.