title: Cell separation by an aqueous two-phase system in a microfluidic device.
abstract: We generated an aqueous two-phase laminar flow in a microfluidic chip and used the system to isolate leukocyte and erythrocyte cells from whole blood cells. The microfluidic system reduced the effect of gravity in the aqueous two-phase system (ATPS). Poly(ethylene glycol) (PEG) and dextran (Dex) solutions were used as the two phases, and the independent flow rates of the solutions were both 2 microL/min. When hydrophobic and hydrophilic polystyrene beads were introduced into the microfluidic device, the hydrophilic beads moved to the Dex layer and the hydrophobic beads to the interface between the two phases. In the case of living cells, Jurkat cells and erythrocytes moved more efficiently to the PEG and Dex layers, respectively, than they move in a conventional ATPS. When whole blood cells were inserted into the microfluidic chip, leukocytes could be separated from erythrocytes because erythrocytes moved to the Dex layer while leukocytes remained outside of this layer in the microfluidic system. The reported microfluidic chip for the whole blood cell separation can effectively be integrated into a Micro Total Analysis System designed for cell-based clinical, forensic, and environmental analyses.
authors.affiliation: School of Materials Science, Japan Advanced Institute of Science and Technology, Asahidai, Nomi, Ishikawa 923-1211, Japan.
authors.forename: Masatoshi
authors.initials: M
authors.lastname: Tsukamoto
authors.forename: Shu
authors.initials: S
authors.lastname: Taira
authors.forename: Shohei
authors.initials: S
authors.lastname: Yamamura
authors.forename: Yasutaka
authors.initials: Y
authors.lastname: Morita
authors.forename: Naoki
authors.initials: N
authors.lastname: Nagatani
authors.forename: Yuzuru
authors.initials: Y
authors.lastname: Takamura
authors.forename: Eiichi
authors.initials: E
authors.lastname: Tamiya
mesh_terms: D002469:Cell Separation / Q000295:instrumentation* / Q000379:methods*; D003911:Dextrans / Q000737:chemistry; D004912:Erythrocytes / Q000166:cytology; D006801:Humans; D057927:Hydrophobic and Hydrophilic Interactions; D019169:Jurkat Cells; D046210:Microfluidic Analytical Techniques; D008863:Microspheres; D055616:Microtechnology; D011092:Polyethylene Glycols / Q000737:chemistry; D014867:Water / Q000737:chemistry*
chemical_list: D003911:Dextrans; D014867:Water; D011092:Polyethylene Glycols