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Optofluidic characterization of marine algae using a microflow cytometer
- Source :
- Biomicrofluidics. 5:032009
- Publication Year :
- 2011
- Publisher :
- AIP Publishing, 2011.
-
Abstract
- The effects of global warming, pollution in river effluents, and changing ocean currents can be studied by characterizing variations in phytoplankton populations. We demonstrate the design and fabrication of a Microflow Cytometer for characterization of phytoplankton. Guided by chevron-shaped grooves on the top and bottom of a microfluidic channel, two symmetric sheath streams wrap around a central sample stream and hydrodynamically focus it in the center of the channel. The lasers are carefully chosen to provide excitation light close to the maximum absorbance wavelengths for the intrinsic fluorophores chlorophyll and phycoerythrin, and the excitation light is coupled to the flow cytometer through the use of an optical fiber. Fluorescence and light scatter are collected using two multimode optical fibers placed at 90-degree angles with respect to the excitation fiber. Light emerging from these collection fibers is directed through optical bandpass filters into photomultiplier tubes. The cytometer measured the optical and side scatter properties of Karenia b., Synechococcus sp., Pseudo-Nitzchia, and Alexandrium. The effect of the sheath-to-sample flow-rate ratio on the light scatter and fluorescence of these marine microorganisms was investigated. Reducing the sample flow rate from 200 μL/min to 10 μL/min produced a more tightly focused sample stream and less heterogeneous signals.
- Subjects :
- Fluid Flow and Transfer Processes
Photomultiplier
Multi-mode optical fiber
Optical fiber
Materials science
business.industry
Biomedical Engineering
Condensed Matter Physics
Laser
Light scattering
law.invention
Absorbance
Wavelength
Colloid and Surface Chemistry
Optics
law
General Materials Science
Special Topic: Microsystems for Manipulation and Analysis of Living Cells (Guest Editor: Alexander Revzin)
Optical filter
business
Subjects
Details
- ISSN :
- 19321058
- Volume :
- 5
- Database :
- OpenAIRE
- Journal :
- Biomicrofluidics
- Accession number :
- edsair.doi.dedup.....e3092764e9381bad7e3c7244dbaef4bc
- Full Text :
- https://doi.org/10.1063/1.3608136