A microfluidic device with fluorimetric detection for intracellular components analysis

Publication: Research - peer-reviewJournal article – Annual report year: 2011

  • Author: Kwapiszewski, Radosław

    Department of Microbioanalytics, Institute of Biotechnology, Warsaw University of Technology

  • Author: Skolimowski, Maciej

    Department of Micro- and Nanotechnology, Technical University of Denmark

  • Author: Ziółkowska, Karina

    Department of Microbioanalytics, Institute of Biotechnology, Warsaw University of Technology

  • Author: Jędrych, Elżbieta

    Department of Microbioanalytics, Institute of Biotechnology, Warsaw University of Technology

  • Author: Chudy, Michał

    Department of Microbioanalytics, Institute of Biotechnology, Warsaw University of Technology

  • Author: Dybko, Artur

    Department of Microbioanalytics, Institute of Biotechnology, Warsaw University of Technology

  • Author: Brzózka, Zbigniew

    Department of Microbioanalytics, Institute of Biotechnology, Warsaw University of Technology

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An integrated microfluidic system that coupled lysis of two cell lines: L929 fibroblasts and A549 epithelial cells, with fluorescence-based enzyme assay was developed to determine β-glucocerebrosidase activity. The microdevice fabricated in poly(dimethylsiloxane) consists of three main parts: a chemical cell lysis zone based on the sheath flow geometry, a micromeander and an optical fibers detection zone. Unlike many methods described in literature that are designed to analyse intracellular components, the presented system enables to perform enzyme assays just after cell lysis process. It reduces the effect of proteases released in lysis process on determined enzymes. Glucocerebrosidase activity, the diagnostic marker for Gaucher’s disease, is the most commonly measured in leukocytes and fibroblasts using 4-methylumbelliferyl-β-D-glucopyranoside as synthetic β-glucoside. The enzyme cleavage releases the fluorescent product, i.e. 4-methylumbelliferone, and its fluorescence is measured as a function of time. The method of enzyme activity determination described in this paper was adapted for flow measurements in the microdevice. The curve of the enzymatic reaction advancement was prepared for three reaction times obtained from application of different flow rates of solutions introduced to the microsystem. Afterwards, determined β-glucocerebrosidase activity was recalculated with regard to 105 cells present in samples used for the tests. The obtained results were compared with a cuvette-based measurements. The lysosomal β-glucosidase activities determined in the microsystem were in good correlation with the values determined during macro-scale measurements.
Original languageEnglish
JournalBiomedical Microdevices
Publication date2011
Volume13
Issue3
Pages431-440
ISSN1387-2176
DOIs
StatePublished
CitationsWeb of Science® Times Cited: 2
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