title: Interconnected ordered nanoporous networks of colloidal crystals integrated on a microfluidic chip for highly efficient protein concentration.
abstract: We report a controllable method to fabricate silica colloidal crystals at defined position in microchannel of microuidic devices using simple surface modification. The formed PCs (photonic crystals) in microfluidic channels were stabilized by chemical cross-linking of Si-O-Si bond between neighboring silica beads. The voids among colloids in PCs integrated on microfluidic devices form interconnected nanoporous networks, which show special electroosmotic properties. Due to the "surface-charge induced ion depletion effect" mechanism, FITC-labeled proteins can be efficiently and selectively concentrated in the anodic boundary of the ion depletion zone. Using this device, about 10(3) - to 10(5)-fold protein concentration was achieved within 10 min. The present simple on chip protein concentration device could be a potential sample preparation component in microfluidic systems for practical biochemical assays.
authors: State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, P R China.
authors: Yu-Lin
authors: YL
authors: Hu
authors: Chen
authors: C
authors: Wang
authors: Zeng-Qiang
authors: ZQ
authors: Wu
authors: Jing-Juan
authors: JJ
authors: Xu
authors: Hong-Yuan
authors: HY
authors: Chen
authors: Xing-Hua
authors: XH
authors: Xia
mesh_terms: D000818:Animals; D003102:Colloids / Q000737:chemistry*; D004285:Dogs; D004867:Equipment Design; D016650:Fluorescein-5-isothiocyanate; D006863:Hydrogen-Ion Concentration; D046210:Microfluidic Analytical Techniques / Q000295:instrumentation / Q000379:methods; D049329:Nanostructures / Q000737:chemistry / Q000648:ultrastructure*; D016062:Porosity; D011506:Proteins / Q000032:analysis*; D012709:Serum Albumin / Q000032:analysis; D013499:Surface Properties
chemical_list: D003102:Colloids; D011506:Proteins; D012709:Serum Albumin; D016650:Fluorescein-5-isothiocyanate