Issue 6, 2011

Hydrodynamic optical alignment for microflow cytometry

Abstract

A microfabricated flow cytometer has been developed that is capable of detecting nearly all of the microparticles in an aqueous suspension. Current design allows for integrated coupling between an optical fiber-based detection system and the particle stream via hydrodynamic focusing. By adjusting the relative flow-rates at the auxiliary inputs of the focusing manifold, the particle stream can be steered out-of-plane relative to the illuminating laser, and similarly the particle stream can be squeezed or expanded. The microfabricated device was constructed in polydimethylsiloxane with cross-sectional microfluidic dimensions of 125 µm × 125 µm. Using the present device and method, fluorescent microparticles in aqueous solution were counted at an absolute counting efficiency of 91 ± 4%. The coefficient of variation of the fluorescence pulse-heights for far-red fluorescent microparticles was 15%. The device exhibited a linear response to fluorescence intensity calibration microparticles as shown by comparison with a commercial cytometer instrument.

Graphical abstract: Hydrodynamic optical alignment for microflow cytometry

Supplementary files

Article information

Article type
Paper
Submitted
13 Oct 2010
Accepted
06 Jan 2011
First published
28 Jan 2011

Lab Chip, 2011,11, 1138-1143

Hydrodynamic optical alignment for microflow cytometry

M. J. Kennedy, S. J. Stelick, L. G. Sayam, A. Yen, D. Erickson and C. A. Batt, Lab Chip, 2011, 11, 1138 DOI: 10.1039/C0LC00500B

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