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A liquid core waveguide fluorescence detector for multicapillary electrophoresis applied to DNA sequencing in a 91-capillary array
KTH, Superseded Departments, Chemistry.
2000 (English)In: Electrophoresis, ISSN 0173-0835, E-ISSN 1522-2683, Vol. 21, no 15, 3290-3304 p.Article in journal (Refereed) Published
Abstract [en]

A new laser-induced fluorescence (LIF) detector for multicapillary electrophoresis is presented. The detection principle is based on waveguiding of the emitted fluorescence from the point of illumination to the capillary ends by total internal reflection (TIR) and imaging of the capillary ends. The capillaries themselves thus act as liquid core waveguides (LCWs). At the illumination point, the capillaries are arranged in a planar array, which allows clean and efficient illumination with a line-focused laser beam. The capillary ends are rearranged into a small, densely packed two-dimensional array, which is imaged end-on with high light collection efficiency and excellent image quality. Wavelength dispersion is obtained with a single prism. Intercapillary optical crosstalk is less than 0.5%, and rejection of stray light is very efficient. The detector is applied to four-color DNA sequencing by gel electrophoresis in a 91-capillary array, with simple fluorescein and rhodamine dyes as fluorophores. Since the imaged two-dimensional array is so compact, the detector has a high potential for very large-scale multiplexing.

Place, publisher, year, edition, pages
2000. Vol. 21, no 15, 3290-3304 p.
Keyword [en]
capillary electrophoresis, fluorescence detection, DNA sequencing, capillary array, waveguide, energy-transfer primers, linear polyacrylamide solutions, replaceable polymer-solutions, sample purification method, nucleic-acid analysis, dye-labeled primers, capillary-electrophoresis, gel-electrophoresis, high-speed, 1000 bases
URN: urn:nbn:se:kth:diva-20037ISI: 000089318300028OAI: diva2:338730
QC 20100525Available from: 2010-08-10 Created: 2010-08-10Bibliographically approved

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