title: Electrokinetic bioprocessor for concentrating cells and molecules.
abstract: Bioprocessors for concentrating bioparticles, such as cells and molecules, are commonly needed in bioanalysis systems. In this microfluidic processor, a global flow field generated by ac electroosmosis transports the embedded particles to the regions near the electrode surface. The processor then utilizes electrophoretic and dielectrophoretic forces, which are effective in short range, to trap the target cells and molecules on the electrode surface. By optimizing the operating parameters, we have concentrated various biological objects in a large range of sizes, including Escherichia coli bacteria, lambda phage DNA, and single-stranded DNA fragments as small as 20 bases that have a radius of gyration of only 3 nm.
authors.affiliation: Institute for Cell Mimetic Space Exploration (CMISE) and Department of Mechanical & Aerospace Engineering, University of California, Los Angeles, Los Angeles, California 90095, USA.
authors.forename: Pak Kin
authors.initials: PK
authors.lastname: Wong
authors.forename: Che-Yang
authors.initials: CY
authors.lastname: Chen
authors.forename: Tza-Huei
authors.initials: TH
authors.lastname: Wang
authors.forename: Chih-Ming
authors.initials: CM
authors.lastname: Ho
mesh_terms: D010582:Bacteriophage lambda / Q000737:chemistry*; D019149:Bioreactors; D004277:DNA, Single-Stranded / Q000737:chemistry*; D004279:DNA, Viral / Q000737:chemistry*; D004563:Electrochemistry; D004566:Electrodes; D019075:Electrophoresis, Capillary / Q000295:instrumentation / Q000379:methods; D004867:Equipment Design; D004926:Escherichia coli / Q000166:cytology*; D046210:Microfluidic Analytical Techniques / Q000295:instrumentation / Q000379:methods*; D009995:Osmosis; D010316:Particle Size; D012680:Sensitivity and Specificity; D013499:Surface Properties
chemical_list: D004277:DNA, Single-Stranded; D004279:DNA, Viral