微流控
生物传感器
混合器
检出限
纳米技术
微流控芯片
实验室晶片
沙门氏菌
材料科学
色谱法
化学
生物
遗传学
细菌
作者
Xue Li,Nana Jin,Rong Guo,Siyuan Wang,Wuzhen Qi,Yuanjie Liu,Yanbin Li,Jianhan Lin
出处
期刊:ACS Sensors
[American Chemical Society]
日期:2021-07-09
卷期号:6 (8): 2883-2892
被引量:70
标识
DOI:10.1021/acssensors.1c00292
摘要
In-field screening of foodborne pathogens plays an important role in ensuring food safety. Thus, a microfluidic biosensor was developed for rapid and sensitive detection of Salmonella using manganese dioxide nanoflowers (MnO2 NFs) for amplifying the biological signal, a microfluidic chip with a convergence–divergence spiral micromixer for performing automatic operations, and a smartphone app with a saturation calculation algorithm for processing the image. First, immune magnetic nanoparticles (MNPs), the sample, and immune MnO2 NFs were fully mixed and sufficiently incubated in the spiral micromixer to form MNP–bacteria–MnO2 sandwich complexes, which were magnetically captured in a separation chamber in the microfluidic chip. Then, a 3,3′,5,5′-tetramethylbenzidine (TMB) substrate was injected and catalyzed by a MnO2 NF nanomimetic enzyme on the complexes, resulting in the production of yellow catalysate. Finally, the catalysate was transferred into a detection chamber and its image was measured and processed using the smartphone app to determine the number of bacteria. This biosensor was able to detect Salmonella from 4.4 × 101 to 4.4 × 106 CFU/mL in 45 min with a detection limit of 44 CFU/mL, and has the potential to provide a promising platform for on-site detection of foodborne bacteria.
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