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Article

Magnetic Bead Chain-Based Continuous-Flow DNA Extraction for Microfluidic PCR Detection of Salmonella

Key Laboratory of Agricultural Information Acquisition Technology, Ministry of Agriculture and Rural Affairs, China Agricultural University, Beijing 100083, China
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Author to whom correspondence should be addressed.
Academic Editors: Nam-Trung Nguyen and Navid Kashaninejad
Received: 9 March 2021 / Revised: 26 March 2021 / Accepted: 27 March 2021 / Published: 1 April 2021
(This article belongs to the Special Issue Feature Papers of Micromachines in Biology and Biomedicine 2021)
Nucleic acid extraction is crucial for PCR detection of pathogenic bacteria to ensure food safety. In this study, a new magnetic extraction method was developed using 3D printing and magnetic silica beads (MSBs) to extract the target DNA from a large volume of bacterial sample and combined with microfluidic PCR to determine the bacteria. After proteinase K was added into a bacterial sample to lyse the bacteria and release the DNA, it was continuous-flow injected into the serpentine channel of the extraction chip, where magnetic silica bead chains had been formed in advance using a homogeneous magnetic field generated by two concentric semicircle magnets to capture the MSBs. Then, the flowing DNA was captured by the MSB chains, washed with alcohol, dried with gas, and eluted with deionized water to obtain the purified and concentrated DNA. Finally, the extracted DNA templates were injected into a microfluidic PCR chip with lyophilized amplification reagents and determined using a commercial qPCR device. The experimental results showed that the DNA extraction efficiency was more than 90%, and the lower detection limit of Salmonella was 102 CFU/mL. This new Salmonella detection method is promising to provide the rapid, sensitive, and simultaneous detection of multiple foodborne pathogens. View Full-Text
Keywords: magnetic bead chains; continuous-flow DNA extraction; microfluidic PCR; Salmonella detection magnetic bead chains; continuous-flow DNA extraction; microfluidic PCR; Salmonella detection
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MDPI and ACS Style

Wang, Y.; Qi, W.; Wang, L.; Lin, J.; Liu, Y. Magnetic Bead Chain-Based Continuous-Flow DNA Extraction for Microfluidic PCR Detection of Salmonella. Micromachines 2021, 12, 384. https://0-doi-org.brum.beds.ac.uk/10.3390/mi12040384

AMA Style

Wang Y, Qi W, Wang L, Lin J, Liu Y. Magnetic Bead Chain-Based Continuous-Flow DNA Extraction for Microfluidic PCR Detection of Salmonella. Micromachines. 2021; 12(4):384. https://0-doi-org.brum.beds.ac.uk/10.3390/mi12040384

Chicago/Turabian Style

Wang, Yuhe, Wuzhen Qi, Lei Wang, Jianhan Lin, and Yuanjie Liu. 2021. "Magnetic Bead Chain-Based Continuous-Flow DNA Extraction for Microfluidic PCR Detection of Salmonella" Micromachines 12, no. 4: 384. https://0-doi-org.brum.beds.ac.uk/10.3390/mi12040384

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