Microfluidic Tool Box as Technology Platform for Hand-Held Diagnostics
| Autor: | Hai Hang Kuo, James A. Profitt, Klaus Kadel, Ronald G Sommer, Gert Blankenstein, Thomas Willms, Ralf-Peter Peters, Michael J. Pugia, Lloyd S. Schulman |
|---|---|
| Rok vydání: | 2005 |
| Předmět: |
Blood Glucose
Glycated Hemoglobin Immunoassay Analyte Chromatography Surface Properties Capillary action Chemistry Point-of-Care Systems Microfluidics Biochemistry (medical) Clinical Biochemistry Mixing (process engineering) Nanotechnology Equipment Design Microfluidic Analytical Techniques Urinalysis Sensitivity and Specificity Buffer (optical fiber) Membrane Miniaturization Humans Fluidics |
| Zdroj: | Clinical Chemistry. 51:1923-1932 |
| ISSN: | 1530-8561 0009-9147 |
| DOI: | 10.1373/clinchem.2005.052498 |
| Popis: | Background: Use of microfluidics in point-of-care testing (POCT) will require on-board fluidics, self-contained reagents, and multistep reactions, all at a low cost. Disposable microchips were studied as a potential POCT platform.Methods: Micron-sized structures and capillaries were embedded in disposable plastics with mechanisms for fluidic control, metering, specimen application, separation, and mixing of nanoliter to microliter volumes. Designs allowed dry reagents to be on separate substrates and liquid reagents to be added. Control of surface energy to ±5 dyne/cm2 and mechanical tolerances to ≤1 μm were used to control flow propulsion into adsorptive, chromatographic, and capillary zones. Fluidic mechanisms were combined into working examples for urinalysis, blood glucose, and hemoglobin A1c testing using indicators (substances that react with analyte, such as dyes, enzyme substrates, and diazonium salts), catalytic reactions, and antibodies as recognition components. Optical signal generation characterized fluid flow and allowed detection.Results: We produced chips that included capillary geometries from 10 to 200 μm with geometries for stopping and starting the flow of blood, urine, or buffer; vented chambers for metering and splitting 100 nL to 30 μL; specimen inlets for bubble-free specimen entry and containment; capillary manifolds for mixing; microstructure interfaces for homogeneous transfer into separation membranes; miniaturized containers for liquid storage and release; and moisture vapor barrier seals for easy use. Serum was separated from whole blood in Conclusion: Disposable microchip technology is compatible with conventional dry-reagent technology and allows a highly compact system for complex assay sequences with minimum manual manipulations and simple operation. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|