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Portable low-cost sensors and sensing systems for the identification andquantitative measurement of bacteria in field water are critical in preventingdrinking water from being contaminated by bacteria. In this article, wereported the design, fabrication and testing of a low-cost, miniaturized andsensitive bacteria sensor based on electrical impedance spectroscopy methodusing a smartphone as the platform. Our design of microfluidics enabled thepre-concentration of the bacteria which lowered the detection limit to 10bacterial cells per milliliter. We envision that our demonstratedsmartphone-based sensing system will realize highly-sensitive and rapidin-field quantification of multiple species of bacteria and pathogens.

Cellphone based Portable Bacteria Pre-Concentrating microfluidic Sensor and Impedance Sensing System