期刊
BIOMEDICAL MICRODEVICES
卷 21, 期 1, 页码 -出版社
SPRINGER
DOI: 10.1007/s10544-018-0354-9
关键词
Digital microfluidic system; Handheld device; Loop-mediated isothermal amplification (LAMP); Naked-eye visualisation
资金
- Macao Science and Technology Development Fund (FDCT) [FDCT110/2016/A3]
- University of Macau [MYRG2017-00022-AMSV, SRG2016-00072-AMSV]
- National Natural Science Foundation of China [31720103918]
- AMSV SKL Fund from the Macao Science and Technology Development Fund (FDCT)
A major goal in the development of point-of-care (POC) devices is to build them as portable to provide a rapid and effective determination for disease pathogens. In nucleic acid testing, an optical detection system used to monitor the product of nucleic acid amplification has always been a bulky accessory. In this work, we developed a handheld, automatic and detection system-free thermal digital microfluidic (DMF) device for DNA detection by loop-mediated isothermal amplification (LAMP). Droplet manipulation and real-time temperature control systems were integrated into a handheld device. The control software could be installed into any tablet and communicate with the device via Bluetooth. In the experimentation, we loaded 2-l samples with an electrowetting force into sandwich-structured DMF chips, thereby considerably reducing reagent consumptions. After an on-chip LAMP reaction, we added a highly concentrated SYBR Green I droplet and mixed it with a reaction droplet to enable product detection with the naked eye. This step prevented aerosol contamination by avoiding the exposure of the reaction droplet to the air. Using a blood parasite Trypanosoma brucei as a model system, this system showed similar results as a commercial thermal cycler and could detect 40 copies per reaction of the DNA target. This low-cost, compact device removed the bulky optical system for DNA detection, thus enabling it to be well suited for POC testing.
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