title: On chip preconcentration and fluorescence labeling of model proteins by use of monolithic columns: device fabrication, optimization, and automation.
abstract: Microfluidic systems with monolithic columns have been developed for preconcentration and on-chip labeling of model proteins. Monoliths were prepared in microchannels by photopolymerization, and their properties were optimized by varying the composition and concentration of the monomers to improve flow and extraction. On-chip labeling of proteins was achieved by driving solutions through the monolith by use of voltage then incubating fluorescent dye with protein retained on the monolith. Subsequently, the labeled proteins were eluted, by applying voltages to reservoirs on the microdevice, and then detected, by monitoring laser-induced fluorescence. Monoliths prepared from octyl methacrylate combine the best protein retention with the possibility of separate elution of unattached fluorescent label with 50% acetonitrile. Finally, automated on-chip extraction and fluorescence labeling of a model protein were successfully demonstrated. This method involves facile sample pretreatment, and therefore has potential for production of integrated bioanalysis microchips.
authors.affiliation: Department of Chemistry and Biochemistry, Brigham Young University, Provo, UT, 84602, USA.
authors.forename: Rui
authors.initials: R
authors.lastname: Yang
authors.forename: Jayson V
authors.initials: JV
authors.lastname: Pagaduan
authors.forename: Ming
authors.initials: M
authors.lastname: Yu
authors.forename: Adam T
authors.initials: AT
authors.lastname: Woolley
mesh_terms: D001331:Automation; D004867:Equipment Design; D005456:Fluorescent Dyes / Q000737:chemistry*; D005464:Fluorobenzenes / Q000737:chemistry; D018841:HSP90 Heat-Shock Proteins / Q000032:analysis / Q000737:chemistry; D008689:Methacrylates / Q000737:chemistry; D046210:Microfluidic Analytical Techniques / Q000295:instrumentation; D008856:Microscopy, Fluorescence / Q000295:instrumentation; D011506:Proteins / Q000032:analysis* / Q000737:chemistry; D052616:Solid Phase Extraction
chemical_list: C513915:AlexaFluor 488 carboxylic acid tetrafluorophenyl ester; D005456:Fluorescent Dyes; D005464:Fluorobenzenes; D018841:HSP90 Heat-Shock Proteins; D008689:Methacrylates; D011506:Proteins