Integrated Plastic Microfluidic Devices with ESI-MS for Drug Screening and Residue Analysis
- 30 March 2001
- journal article
- research article
- Published by American Chemical Society (ACS) in Analytical Chemistry
- Vol. 73 (9), 2048-2053
- https://doi.org/10.1021/ac001474j
Abstract
For this work, two different plastic microfluidic devices are designed and fabricated for applications in high-throughput residue analysis of food contaminants and drug screening of small-molecule libraries. Microfluidic networks on copolyester and poly(dimethylsiloxane) substrates are fabricated by silicon template imprinting and capillary molding techniques. The first device is developed to perform affinity capture, concentration, and direct identification of targeted compounds using electrospray ionization mass spectrometry. Poly(vinylidene fluoride) membranes sandwiched between the imprinted copolyester microchannels in an integrated platform provide continuous affinity dialysis and concentration of a reaction mixture containing aflatoxin B1 antibody and aflatoxins. The second microfluidic device is composed of microchannels on the poly(dimethylsiloxane) substrates. The device is designed to perform miniaturized ultrafiltration of affinity complexes of phenobarbital antibody and barbiturates, including the sequential loading, washing, and dissociation steps. These microfabricated devices not only significantly reduce dead volume and sample consumption but also increase the detection sensitivity by at least 1−2 orders of magnitude over those reported previously. Improvements in detection sensitivity are attributed to analyte preconcentration during the affinity purification step, limited analyte dilution in the microdialysis junction, minimal sample loss, and the amenability of ESI-MS to nanoscale sample flow rates.Keywords
This publication has 32 references indexed in Scilit:
- Prototyping of Masks, Masters, and Stamps/Molds for Soft Lithography Using an Office Printer and Photographic ReductionAnalytical Chemistry, 2000
- Room-Temperature Imprinting Method for Plastic Microchannel FabricationAnalytical Chemistry, 2000
- Rapid Prototyping of Microfluidic Systems in Poly(dimethylsiloxane)Analytical Chemistry, 1998
- Fabricating Large Arrays of Microwells with Arbitrary Dimensions and Filling Them Using Discontinuous DewettingAnalytical Chemistry, 1998
- UV Laser Machined Polymer Substrates for the Development of Microdiagnostic SystemsAnalytical Chemistry, 1997
- Characterization of the Microdialysis Junction Interface for Capillary Electrophoresis/Microelectrospray Ionization Mass SpectrometryAnalytical Chemistry, 1997
- Ultra-High-Speed DNA Sequencing Using Capillary Electrophoresis ChipsAnalytical Chemistry, 1995
- Manipulation of Sample Fractions on a Capillary Electrophoresis ChipAnalytical Chemistry, 1995
- Determination of aflatoxins in dust and urine by liquid chromatography/electrospray ionization tandem mass spectrometryRapid Communications in Mass Spectrometry, 1995
- Glass chips for high-speed capillary electrophoresis separations with submicrometer plate heightsAnalytical Chemistry, 1993