by Keyword: Coulter-counter

Rodriguez-Trujillo, R., Castillo-Fernandez, O., Arundell, M., Samitier, J., Gomila, G., (2008). Yeast cells detection in a very fast and highly versatile microfabricated cytometer MicroTAS 2008 12th International Conference on Miniaturized Systems for Chemistry and Life Sciences , Chemical and Biological Microsystems Society (San Diego, USA) , 1888-1890

A novel microfluidic chip able to detect a wide range of different cell sizes at very high rates is reported. The device uses two-dimensional hydrodynamic focusing [1] of the sample (conducting) flow by three non-conducting flows and high-speed differential impedance detection electronics. High-speed counting of 15μm polystyrene particles and 5μm yeast cells with a rate of up to 1000 particles/s has been demonstrated. Using of two-dimensional focusing effect turn out to be essential in a device with very large cross-sectional area (100x43 μm2) in which particles result undetectable in the absence of focusing.

JTD Keywords: Coulter-counter, Impedance, Microfluidics, Polydimethylsiloxane