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We introduce a new image cytometer design for detection of very smallparticulate and demonstrate its capability in water analysis. The device is acompact microscope composed of off the shelf components, such as a lightemitting diode (LED) source, a complementary metal oxide semiconductor (CMOS)image sensor, and a specific combination of optical lenses that allow, throughan appropriate software, Fourier transform processing of the sample volume.Waterborne microorganisms, such as Escherichia coli (E. coli), Legionellapneumophila (L. pneumophila) and Phytoplankton, are detected by interrogatingthe volume sample either in a fluorescent or label-free mode, i.e. with orwithout fluorescein isothiocyanate (FITC) molecules attached to themicro-organisms, respectively. We achieve a sensitivity of 50 cells/ml, whichcan be further increased to 0.2 cells/ml by preconcentrating an initial samplevolume of 500 ml with an adhoc fluidic system. We also prove the capability ofthe proposed image cytometer of differentiating microbiological populations bysize with a resolution of 3 um and of operating in real contaminated water.

analyst (london. 1877. online)/analyst

An image cytometer based on angular spatial frequency processing and its  validation for rapid detection and quantification of waterborne  microorganisms