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Portable Impedance-Sensing Device for Microorganism Characterization in the Field
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This study developed a portable microfluidic device using impedance spectroscopy to rapidly detect and characterize individual microorganisms in heterogeneous field samples. Portable detection technologies are also being applied to monitoring microorganisms associated with microplastic surfaces (the plastisphere) in water.
Abstract A variety of biosensors have been proposed to quickly detect and measure the properties of individual microorganisms among heterogeneous populations, but challenges related to cost, portability, stability, sensitivity, and power consumption limit their applicability. This study proposes a portable microfluidic device based on impedance flow-cytometry and electrical impedance spectroscopy that can detect and quantify the size of microparticles larger than 45 μm, such as algae and microplastics. The system is low cost ($300), portable (5 cm × 5 cm), low-power (1.2 W), and easily fabricated utilizing a 3D-printer and industrial printed circuit board technology. The main novelty we demonstrate is the use of square wave excitation signal for impedance measurements with quadrature phase-sensitive detectors. A linked algorithm removes the errors associated to higher order harmonics. After validating the performance of the device for complex impedance models, we used it to detect and differentiate between polyethylene microbeads of sizes between 63 μm and 83 μm, and buccal cells between 45 μm and 70 μm. A precision of 3% is reported for the measured impedance and a minimum size of 45 μm is reported for the particle characterization.
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Portable impedance-sensing device for microorganism characterization in the field
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Researchers developed a low-cost, portable microfluidic device that uses electrical impedance measurements to detect and size microparticles larger than 45 micrometers, including both algae and microplastics, in the field. The system costs around $300, runs on minimal power, and can be built with a 3D printer, making it potentially accessible for environmental monitoring in resource-limited settings. Affordable field-deployable microplastic detection tools like this could significantly expand our ability to monitor plastic pollution in rivers, lakes, and coastal waters.
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Researchers developed a microfluidic device using electrical impedance spectroscopy to detect and monitor microplastic particles in drinking water. The device aimed to provide a real-time, sensitive method for MP contamination monitoring at the point of use.
A Droplet-Based Microfluidic Impedance Flow Cytometer for Detection of Micropollutants in Water
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A droplet-based microfluidic impedance cytometer was designed and tested for in-situ detection of microplastic particles in water, offering a portable and rapid alternative to laboratory-based analytical methods.
Cost-Effective and Wireless Portable Device for Rapid and Sensitive Quantification of Micro/Nanoplastics
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Electrical impedance spectroscopy based strategy for detecting and differentiating microplastics in water
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Research digests by email
When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.