The Optimization of Electrophoresis on a Glass Microfluidic Chip and its Application in Forensic Science |
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| Authors: | Jun P. Han Ph.D. Jing Sun Ph.D. Le Wang Ph.D. Peng Liu Ph.D. Bin Zhuang Ph.D. Lei Zhao M.S. Yao Liu Ph.D. Cai X. Li Ph.D. |
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| Affiliation: | 1. Key Laboratory of Forensic Genetics, Beijing Engineering Research Center of Crime Scene Evidence Examination, Institute of Forensic Science, Ministry of Public Security, Beijing, China;2. Forensic Science and Technology Department of Chaoyang Sub‐bureau, Beijing Public Security Bureau, Beijing, China;3. Tsinghua University, Beijing, China |
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| Abstract: | Microfluidic chips offer significant speed, cost, and sensitivity advantages, but numerous parameters must be optimized to provide microchip electrophoresis detection. Experiments were conducted to study the factors, including sieving matrices (the concentration and type), surface modification, analysis temperature, and electric field strengths, which all impact the effectiveness of microchip electrophoresis detection of DNA samples. Our results showed that the best resolution for ssDNA was observed using 4.5% w/v (7 M urea) lab‐fabricated LPA gel, dynamic wall coating of the microchannel, electrophoresis temperatures between 55 and 60°C, and electrical fields between 350 and 450 V/cm on the microchip‐based capillary electrophoresis (μCE) system. One base‐pair resolution could be achieved in the 19‐cm‐length microchannel. Furthermore, both 9947A standard genomic DNA and DNA extracted from blood spots were demonstrated to be successfully separated with well‐resolved DNA peaks in 8 min. Therefore, the microchip electrophoresis system demonstrated good potential for rapid forensic DNA analysis. |
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| Keywords: | forensic science DNA typing electrophoresis on microfluidic chips rapid analysis |
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