清脆的
重组酶聚合酶扩增
微流控
生物传感器
重组酶
蜡样芽孢杆菌
计算生物学
纳米技术
生物
细菌
材料科学
环介导等温扩增
DNA
遗传学
基因
重组
作者
Gaowa Xing,Yuting Shang,Xiaorui Wang,Haifeng Lin,Shulang Chen,Qiaosheng Pu,Ling Lin
标识
DOI:10.1016/j.bios.2022.114885
摘要
Foodborne pathogens have raised significant concerns in human public health. Rapid, high-sensitive, low-cost, and easy-to-use testing methods for food safety are needed. In this study, we developed a finger-actuated microfluidic biosensor (FA-MB) for multiplexed detection of Bacillus cereus and other six common foodborne pathogens based on one-pot CRISPR/Cas12a combined with recombinase aided amplification (RAA). Wells for RAA and CRISPR/Cas12a were isolated to avoid interference, while finger-actuated one-way control valves were incorporated to fulfill the unidirectional flow of RAA products to the CRISPR/Cas12a reaction wells, realizing one-pot RAA-CRISPR/Cas12a assay. The final fluorescent signal was acquired and processed by a smartphone. Under selected experimental conditions, seven pathogenic bacteria could be tested in about 1 h with the limits of detection (LODs) below 500 CFU/mL. Recoveries ranged from 90% to 116% of the spiked samples were readily achieved. The proposed FA-MB is highly integrated and easy-to-use, and could be used for rapid, high-sensitive point of care (POC) testing without the external driving device, suitable for resource-constrained settings.
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