title: Magnetic-based purification system with simultaneous sample washing and concentration.
abstract: 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 microl/min and 88.10 +/- 3.17% at a flow rate of 1,000 microl/min and a purification efficiency of 99.10 +/- 4.3% at a flow rate of 900 microl/min were achieved.
authors.affiliation: Bioelectronics Program, Institute of Microelectronics, 11 Science Park Road, Singapore 117685, Republic of Singapore. qasem.alramadan@epfl.ch
authors.forename: Qasem
authors.initials: Q
authors.lastname: Ramadan
authors.forename: Ting Ting
authors.initials: TT
authors.lastname: Lau
authors.forename: Shihan Bryan
authors.initials: SB
authors.lastname: Ho
mesh_terms: D008280:Magnetics; D046210:Microfluidic Analytical Techniques / Q000295:instrumentation / Q000379:methods*; D010316:Particle Size