title: Functionalized magnetic micro- and nanoparticles: optimization and application to micro-chip tryptic digestion.
abstract: The preparation of an easily replaceable protease microreactor for micro-chip application is described. Magnetic particles coated with poly(N-isopropylacrylamide), polystyrene, poly(2-hydroxyethyl methacrylate-co-ethylene dimethacrylate), poly(glycidyl methacrylate), [(2-amino-ethyl)hydroxymethylen]biphosphonic acid, or alginic acid with immobilized trypsin were utilized for heterogeneous digestion. The properties were optimized, with the constraint of allowing immobilization in a microchannel by a magnetic field gradient. To obtain the highest digestion efficiency, sub-micrometer spheres were organized by an inhomogeneous external magnetic field perpendicularly to the direction of the channel. Kinetic parameters of the enzyme reactor immobilized in micro-chip capillary (micro-chip immobilized magnetic enzyme reactor (IMER)) were determined. The capability of the proteolytic reactor was demonstrated by five model (glyco)proteins ranging in molecular mass from 4.3 to 150 kDa. Digestion efficiency of proteins in various conformations was investigated using SDS-PAGE, HPCE, RP-HPLC, and MS. The compatibility of the micro-chip IMER system with total and limited proteolysis of high-molecular-weight (glyco)proteins was confirmed. It opens the route to automated, high-throughput proteomic micro-chip devices.
authors.affiliation: Laboratoire Physicochimie Curie, UMR 168 CNRS/Institute Curie, Paris, France. Zuzana.Bilkova@upce.cz
authors.forename: Zuzana
authors.initials: Z
authors.lastname: Bílková
authors.forename: Marcela
authors.initials: M
authors.lastname: Slováková
authors.forename: Nicolas
authors.initials: N
authors.lastname: Minc
authors.forename: Claus
authors.initials: C
authors.lastname: Fütterer
authors.forename: Roxana
authors.initials: R
authors.lastname: Cecal
authors.forename: Daniel
authors.initials: D
authors.lastname: Horák
authors.forename: Milan
authors.initials: M
authors.lastname: Benes
authors.forename: Isabelle
authors.initials: I
authors.lastname: le Potier
authors.forename: Jana
authors.initials: J
authors.lastname: Krenková
authors.forename: Michael
authors.initials: M
authors.lastname: Przybylski
authors.forename: Jean-Louis
authors.initials: JL
authors.lastname: Viovy
mesh_terms: D016229:Amyloid beta-Peptides / Q000737:chemistry; D002851:Chromatography, High Pressure Liquid; D004591:Electrophoresis, Polyacrylamide Gel; D052203:Ferrosoferric Oxide / Q000737:chemistry*; D006801:Humans; D049329:Nanostructures / Q000737:chemistry*; D010446:Peptide Fragments / Q000032:analysis* / Q000737:chemistry; D040081:Protein Array Analysis / Q000379:methods*; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization; D014357:Trypsin / Q000737:chemistry*
chemical_list: D016229:Amyloid beta-Peptides; D010446:Peptide Fragments; C078592:amyloid beta-protein (1-40); D014357:Trypsin; D052203:Ferrosoferric Oxide