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Shunting microfluidic PCR device for rapid bacterial detection.
Talanta ( IF 5.6 ) Pub Date : 2019-08-28 , DOI: 10.1016/j.talanta.2019.120303
Abbas Salman 1 , Helen Carney 1 , Simon Bateson 2 , Zulfiqur Ali 2
Affiliation  

Polymerase chain reaction (PCR) is commonly used for the analysis of nucleic acids in a variety of applications including clinical. There is, however, a need for a low cost portable PCR device that allows rapid identification of pathogenic bacteria. We report a shunting PCR microfluidic device comprising: polycarbonate microfluidic PCR chip; shunting thermal cycler and fluorescence detector. The microfluidic PCR chip - fabricated using micro-milling and thermal fusion bonding for sealing of the cover - was shunted between three double side temperature zones for thermal cycling. Rapid amplification was observed with heating and cooling rates of 1.8 °C/s and 2 °C/s respectively. Lock-in photodetector for fluorescence detection of the microfluidic PCR chip achieved at 95% confidence an LOD of 75pM FITC and 0.7 ng μl-1 of dsDNA using a QuantiFluor assay kit. The device was validated using universal primers - based on chromosomal DNA extracted from non-pathogenic K-12 subtype of Escherichia coli (E. coli) - for amplification of fragments of 250, 552 and 1500 bp. PCR amplification was demonstrated, with annealing temperatures ranging between 54 °C and 68 °C, and confirmed using gel electrophoresis. The developed shunting PCR microfluidic device will allow for low cost and portable nucleic acid amplification for the detection of infectious diseases.

中文翻译:

分流微流控PCR装置可快速检测细菌。

聚合酶链反应(PCR)通常用于包括临床在内的各种应用中的核酸分析。然而,需要一种允许快速鉴定病原细菌的低成本便携式PCR装置。我们报告了一种分流PCR微流体装置,包括:聚碳酸酯微流体PCR芯片;以及 分流热循环仪和荧光检测器。使用微铣削和热熔合技术制造的微流体PCR芯片用于盖的密封-在三个双侧温度区域之间分流以进行热循环。加热和冷却速率分别为1.8°C / s和2°C / s时,观察到快速扩增。用于微流体PCR芯片荧光检测的锁定光电检测器在95%置信度下的LOD为75pM FITC和0。使用QuantiFluor分析试剂盒提取7 ngμl-1的dsDNA。使用通用引物(基于从大肠杆菌(E. coli)的非致病性K-12亚型中提取的染色体DNA)验证了该设备,以扩增250、552和1500 bp的片段。证实了PCR扩增,退火温度在54℃至68℃之间,并使用凝胶电泳进行了证实。研发的分流式PCR微流控设备可实现低成本和便携式核酸扩增,以检测传染病。并使用凝胶电泳进行确认。研发的分流式PCR微流控设备可实现低成本和便携式核酸扩增,以检测传染病。并使用凝胶电泳进行确认。研发的分流式PCR微流控设备可实现低成本和便携式核酸扩增,以检测传染病。
更新日期:2019-08-28
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