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Huang F, Sun C, Dong J, Wu X, Du Y, Hu Q, Zhou L. Ultra-sensitive fluorescent biosensor for multiple bacteria detection based on CDs/QDs@ZIF-8 and microfluidic fluidized bed. Mikrochim Acta 2024; 191:237. [PMID: 38570419 DOI: 10.1007/s00604-024-06303-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2023] [Accepted: 03/07/2024] [Indexed: 04/05/2024]
Abstract
An ultra-sensitive fluorescent biosensor based on CDs/QDs@ZIF-8 and microfluidic fluidized bed was developed for rapid and ultra-sensitive detection of multiple target bacteria. The zeolitic imidazolate frameworks (ZIF-8) act as the carrier to encapsulate three kinds of fluorescence signal molecules from the CDs/QDs@ZIF-8 signal amplification system. Besides, three kinds of target pathogenic bacteria were automatically, continuously, and circularly captured by the magnetic nanoparticles (MNPs) in the microfluidic fluidized bed. The neutral Na2EDTA solution was the first time reported to not only dissolve the ZIF-8 frameworks from the MNPs-bacteria-CDs/QDs@ZIF-8 sandwich complexes, but also release the CDs/QDs from sandwich complexes with no loss of fluorescence signal. Due to the advantages of signal amplification and automated sample pretreatment, the proposed fluorescent biosensor can simultaneously detect Escherichia coli O157:H7, Salmonella paratyphi A, and Salmonella paratyphi B as low as 101 CFU/mL within 1.5 h, respectively. The mean recovery in spiked milk samples can reach 99.18%, verifying the applicability of this biosensor in detecting multiple bacteria in real samples.
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Affiliation(s)
- Fengchun Huang
- National Key Laboratory of Biochemical Engineering, PLA Key Laboratory of Biopharmaceutical Production & Formulation Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, 100190, People's Republic of China
- Innovation Academy for Green Manufacture Institute, Chinese Academy of Sciences, Beijing, 100190, People's Republic of China
- Institute of Agro-Product Quality and Safety, of Quality Standard & Testing Technology for Agro-Products, Key Laboratory, Chinese Academy of Agricultural Sciences, Beijing, 100081, China
| | - Chongsi Sun
- National Key Laboratory of Biochemical Engineering, PLA Key Laboratory of Biopharmaceutical Production & Formulation Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, 100190, People's Republic of China
- Innovation Academy for Green Manufacture Institute, Chinese Academy of Sciences, Beijing, 100190, People's Republic of China
| | - Jinying Dong
- National Key Laboratory of Biochemical Engineering, PLA Key Laboratory of Biopharmaceutical Production & Formulation Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, 100190, People's Republic of China
- University of Chinese Academy of Sciences, Beijing, 100049, People's Republic of China
| | - Xiaoya Wu
- National Key Laboratory of Biochemical Engineering, PLA Key Laboratory of Biopharmaceutical Production & Formulation Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, 100190, People's Republic of China
- Innovation Academy for Green Manufacture Institute, Chinese Academy of Sciences, Beijing, 100190, People's Republic of China
| | - Yuguang Du
- National Key Laboratory of Biochemical Engineering, PLA Key Laboratory of Biopharmaceutical Production & Formulation Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, 100190, People's Republic of China
- Innovation Academy for Green Manufacture Institute, Chinese Academy of Sciences, Beijing, 100190, People's Republic of China
- University of Chinese Academy of Sciences, Beijing, 100049, People's Republic of China
- Biosafety Research Center Yangtze River Delta in Zhangjiagang, Suzhou, 215611, People's Republic of China
| | - Qiushi Hu
- National Key Laboratory of Biochemical Engineering, PLA Key Laboratory of Biopharmaceutical Production & Formulation Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, 100190, People's Republic of China
- Innovation Academy for Green Manufacture Institute, Chinese Academy of Sciences, Beijing, 100190, People's Republic of China
- Biosafety Research Center Yangtze River Delta in Zhangjiagang, Suzhou, 215611, People's Republic of China
| | - Lei Zhou
- National Key Laboratory of Biochemical Engineering, PLA Key Laboratory of Biopharmaceutical Production & Formulation Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, 100190, People's Republic of China.
- Innovation Academy for Green Manufacture Institute, Chinese Academy of Sciences, Beijing, 100190, People's Republic of China.
- University of Chinese Academy of Sciences, Beijing, 100049, People's Republic of China.
- Biosafety Research Center Yangtze River Delta in Zhangjiagang, Suzhou, 215611, People's Republic of China.
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Lou C, Yang H, Hou Y, Huang H, Qiu J, Wang C, Sang Y, Liu H, Han L. Microfluidic Platforms for Real-Time In Situ Monitoring of Biomarkers for Cellular Processes. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2024; 36:e2307051. [PMID: 37844125 DOI: 10.1002/adma.202307051] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/17/2023] [Revised: 09/05/2023] [Indexed: 10/18/2023]
Abstract
Cellular processes are mechanisms carried out at the cellular level that are aimed at guaranteeing the stability of the organism they comprise. The investigation of cellular processes is key to understanding cell fate, understanding pathogenic mechanisms, and developing new therapeutic technologies. Microfluidic platforms are thought to be the most powerful tools among all methodologies for investigating cellular processes because they can integrate almost all types of the existing intracellular and extracellular biomarker-sensing methods and observation approaches for cell behavior, combined with precisely controlled cell culture, manipulation, stimulation, and analysis. Most importantly, microfluidic platforms can realize real-time in situ detection of secreted proteins, exosomes, and other biomarkers produced during cell physiological processes, thereby providing the possibility to draw the whole picture for a cellular process. Owing to their advantages of high throughput, low sample consumption, and precise cell control, microfluidic platforms with real-time in situ monitoring characteristics are widely being used in cell analysis, disease diagnosis, pharmaceutical research, and biological production. This review focuses on the basic concepts, recent progress, and application prospects of microfluidic platforms for real-time in situ monitoring of biomarkers in cellular processes.
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Affiliation(s)
- Chengming Lou
- State Key Laboratory of Crystal Materials, Shandong University, Jinan, 250100, P. R. China
| | - Hongru Yang
- State Key Laboratory of Crystal Materials, Shandong University, Jinan, 250100, P. R. China
| | - Ying Hou
- Institute for Advanced Interdisciplinary Research (IAIR), University of Jinan, Jinan, 250022, P. R. China
| | - Haina Huang
- Institute for Advanced Interdisciplinary Research (IAIR), University of Jinan, Jinan, 250022, P. R. China
| | - Jichuan Qiu
- State Key Laboratory of Crystal Materials, Shandong University, Jinan, 250100, P. R. China
| | - Chunhua Wang
- Institute for Advanced Interdisciplinary Research (IAIR), University of Jinan, Jinan, 250022, P. R. China
| | - Yuanhua Sang
- State Key Laboratory of Crystal Materials, Shandong University, Jinan, 250100, P. R. China
| | - Hong Liu
- State Key Laboratory of Crystal Materials, Shandong University, Jinan, 250100, P. R. China
- Institute for Advanced Interdisciplinary Research (IAIR), University of Jinan, Jinan, 250022, P. R. China
| | - Lin Han
- Institute of Marine Science and Technology, Shandong University, Qingdao, Shandong, 266000, P. R. China
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Chen C, Ran B, Liu B, Liu X, Liu Y, Lan M, Manasseh R, Zhu Y. Development of a novel microfluidic biosensing platform integrating micropillar array electrode and acoustic microstreaming techniques. Biosens Bioelectron 2023; 223:114703. [PMID: 36563526 DOI: 10.1016/j.bios.2022.114703] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2022] [Revised: 09/04/2022] [Accepted: 09/05/2022] [Indexed: 01/11/2023]
Abstract
Quantifying biomarkers at the early stage of the disease is challenging due to the low abundance of biomarkers in the sample and the lack of sensitive techniques. This article reports the development of a novel microfluidic electrochemical biosensing platform to address this challenge. The electrochemical sensing is achieved by utilizing a micropillar array electrode (μAE) coated with 3D bimetallic Pt-Pd nanotrees to enhance the sensitivity. A bubble-based acoustic microstreaming technique is integrated with the device to increase the contact of analyte molecules with the surface of electrodes to further enhance the electrochemical performance. The current density of Pt-Pd NTs/μAE with acoustic microstreaming is nearly 22 times that of the bare planar electrode in potassium ferrocyanide solution. The developed biosensor has demonstrated excellent sensing performance. For hydrogen peroxide detection, both the Pt-Pd NTs/μAE and acoustic microstreaming contribute to the sensitivity enhancement. The current density of the Pt-Pd NTs/μAE is approximatively 28 times that of the bare μAE. With acoustic microstreaming, this enhancement is further increased by nearly 1.6 times. The platform has a linear detection range of 5-1000 μM with a LOD of 1.8 μM toward hydrogen peroxide detection, while for sarcosine detection, the linear range is between 5 and 100 μM and LOD is 2.2 μM, respectively. Furthermore, the sarcosine biosensing shows a high sensitivity of 667 μA mM-1∙cm-2. Such a sensing platform has the potential as a portable device for high sensitivity detection of biomarkers.
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Affiliation(s)
- Chaozhan Chen
- School of Science, Harbin Institute of Technology, Shenzhen, Shenzhen, 518055, PR China; School of Mechanical Engineering and Automation, Harbin Institute of Technology, Shenzhen, Shenzhen, 518055, PR China; Center for Microflows and Nanoflows, Harbin Institute of Technology, Shenzhen, Shenzhen, 518055, PR China
| | - Bin Ran
- School of Science, Harbin Institute of Technology, Shenzhen, Shenzhen, 518055, PR China; School of Mechanical Engineering and Automation, Harbin Institute of Technology, Shenzhen, Shenzhen, 518055, PR China; Center for Microflows and Nanoflows, Harbin Institute of Technology, Shenzhen, Shenzhen, 518055, PR China
| | - Bo Liu
- School of Science, Harbin Institute of Technology, Shenzhen, Shenzhen, 518055, PR China; School of Mechanical Engineering and Automation, Harbin Institute of Technology, Shenzhen, Shenzhen, 518055, PR China; Center for Microflows and Nanoflows, Harbin Institute of Technology, Shenzhen, Shenzhen, 518055, PR China
| | - Xiaoxuan Liu
- School of Science, Harbin Institute of Technology, Shenzhen, Shenzhen, 518055, PR China; Center for Microflows and Nanoflows, Harbin Institute of Technology, Shenzhen, Shenzhen, 518055, PR China
| | - Ya Liu
- BGI-Shenzhen, Shenzhen, 518083, China; Shenzhen Key Laboratory of Single-Cell Omics, BGI-Shenzhen, Shenzhen, 518100, China
| | - Minbo Lan
- Shanghai Key Laboratory of Functional Materials Chemistry, School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai, 200237, PR China
| | - Richard Manasseh
- School of Engineering, Swinburne University of Technology, Hawthorn, VIC, 3122, Australia
| | - Yonggang Zhu
- School of Science, Harbin Institute of Technology, Shenzhen, Shenzhen, 518055, PR China; School of Mechanical Engineering and Automation, Harbin Institute of Technology, Shenzhen, Shenzhen, 518055, PR China; Center for Microflows and Nanoflows, Harbin Institute of Technology, Shenzhen, Shenzhen, 518055, PR China.
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Han H, Sohn B, Choi J, Jeon S. Recent advances in magnetic nanoparticle-based microfluidic devices for the pretreatment of pathogenic bacteria. Biomed Eng Lett 2021; 11:297-307. [PMID: 34426777 PMCID: PMC8374882 DOI: 10.1007/s13534-021-00202-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2021] [Revised: 08/06/2021] [Accepted: 08/08/2021] [Indexed: 12/15/2022] Open
Abstract
Rapid and sensitive detection of pathogenic bacteria in various samples, including food and drinking water, is important to prevent bacterial diseases. Most bacterial solutions contain only a small number of bacteria in complex matrices with impurities; hence, pretreatment is necessary to separate and concentrate target bacteria before sensing. Among various pretreatment methods, iron oxide magnetic nanoparticle (MNP)-based pretreatment has drawn attention owing to the unique properties of MNP, such as high magnetic susceptibility, superparamagnetism, and biocompatibility. After target bacteria are captured by recognition molecule-functionalized MNPs, bacteria-MNP complexes can be easily separated and enriched by applying an external magnetic field. Various devices, such as optical, electrochemical, and magnetoresistance sensors, can be used to detect target bacteria, and their detection principles have been discussed in numerous review papers. Herein, we focus on recent research advances and challenges in magnetic pretreatment of pathogenic bacteria using microfluidic devices, which offer the advantages of process automation and miniaturization.
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Affiliation(s)
- Hyunsoo Han
- Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), Pohang, Gyeongbuk Republic of Korea
| | - Bokyeong Sohn
- Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), Pohang, Gyeongbuk Republic of Korea
| | - Jihun Choi
- Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), Pohang, Gyeongbuk Republic of Korea
| | - Sangmin Jeon
- Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), Pohang, Gyeongbuk Republic of Korea
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Abstract
Over the past decades, microfluidic devices based on many advanced techniques have aroused widespread attention in the fields of chemical, biological, and analytical applications. Integration of microdevices with a variety of chip designs will facilitate promising functionality. Notably, the combination of microfluidics with functional nanomaterials may provide creative ideas to achieve rapid and sensitive detection of various biospecies. In this review, focused on the microfluids and microdevices in terms of their fabrication, integration, and functions, we summarize the up-to-date developments in microfluidics-based analysis of biospecies, where biomarkers, small molecules, cells, and pathogens as representative biospecies have been explored in-depth. The promising applications of microfluidic biosensors including clinical diagnosis, food safety control, and environmental monitoring are also discussed. This review aims to highlight the importance of microfluidics-based biosensors in achieving high throughput, highly sensitive, and low-cost analysis and to promote microfluidics toward a wider range of applications.
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Affiliation(s)
- Yanlong Xing
- Key Laboratory of Emergency and Trauma, Ministry of Education, Key Laboratory of Hainan Trauma and Disaster Rescue, The First Affiliated Hospital of Hainan Medical University, College of Pharmacy, Institute of Functional Materials and Molecular Imaging, College of Emergency and Trauma, Hainan Medical University, Haikou 571199, China
| | - Linlu Zhao
- Key Laboratory of Emergency and Trauma, Ministry of Education, Key Laboratory of Hainan Trauma and Disaster Rescue, The First Affiliated Hospital of Hainan Medical University, College of Pharmacy, Institute of Functional Materials and Molecular Imaging, College of Emergency and Trauma, Hainan Medical University, Haikou 571199, China
| | - Ziyi Cheng
- Key Laboratory of Emergency and Trauma, Ministry of Education, Key Laboratory of Hainan Trauma and Disaster Rescue, The First Affiliated Hospital of Hainan Medical University, College of Pharmacy, Institute of Functional Materials and Molecular Imaging, College of Emergency and Trauma, Hainan Medical University, Haikou 571199, China
| | - Chuanzhu Lv
- Key Laboratory of Emergency and Trauma, Ministry of Education, Key Laboratory of Hainan Trauma and Disaster Rescue, The First Affiliated Hospital of Hainan Medical University, College of Pharmacy, Institute of Functional Materials and Molecular Imaging, College of Emergency and Trauma, Hainan Medical University, Haikou 571199, China
| | - Feifei Yu
- Key Laboratory of Emergency and Trauma, Ministry of Education, Key Laboratory of Hainan Trauma and Disaster Rescue, The First Affiliated Hospital of Hainan Medical University, College of Pharmacy, Institute of Functional Materials and Molecular Imaging, College of Emergency and Trauma, Hainan Medical University, Haikou 571199, China
| | - Fabiao Yu
- Key Laboratory of Emergency and Trauma, Ministry of Education, Key Laboratory of Hainan Trauma and Disaster Rescue, The First Affiliated Hospital of Hainan Medical University, College of Pharmacy, Institute of Functional Materials and Molecular Imaging, College of Emergency and Trauma, Hainan Medical University, Haikou 571199, China
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Thiriet PE, Medagoda D, Porro G, Guiducci C. Rapid Multianalyte Microfluidic Homogeneous Immunoassay on Electrokinetically Driven Beads. BIOSENSORS 2020; 10:212. [PMID: 33371213 PMCID: PMC7766682 DOI: 10.3390/bios10120212] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/05/2020] [Revised: 12/11/2020] [Accepted: 12/17/2020] [Indexed: 12/13/2022]
Abstract
The simplicity of homogeneous immunoassays makes them suitable for diagnostics of acute conditions. Indeed, the absence of washing steps reduces the binding reaction duration and favors a rapid and compact device, a critical asset for patients experiencing life-threatening diseases. In order to maximize analytical performance, standard systems employed in clinical laboratories rely largely on the use of high surface-to-volume ratio suspended moieties, such as microbeads, which provide at the same time a fast and efficient collection of analytes from the sample and controlled aggregation of collected material for improved readout. Here, we introduce an integrated microfluidic system that can perform analyte detection on antibody-decorated beads and their accumulation in confined regions within 15 min. We employed the system to the concomitant analysis of clinical concentrations of Neutrophil Gelatinase-Associated Lipocalin (NGAL) and Cystatin C in serum, two acute kidney injury (AKI) biomarkers. To this end, high-aspect-ratio, three-dimensional electrodes were integrated within a microfluidic channel to impart a controlled trajectory to antibody-decorated microbeads through the application of dielectrophoretic (DEP) forces. Beads were efficiently retained against the fluid flow of reagents, granting an efficient on-chip analyte-to-bead binding. Electrokinetic forces specific to the beads' size were generated in the same channel, leading differently decorated beads to different readout regions of the chip. Therefore, this microfluidic multianalyte immunoassay was demonstrated as a powerful tool for the rapid detection of acute life-threatening conditions.
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Affiliation(s)
- Pierre-Emmanuel Thiriet
- Laboratory of Life Sciences Electronics, École Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland; (D.M.); (G.P.); (C.G.)
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Xue L, Guo R, Huang F, Qi W, Liu Y, Cai G, Lin J. An impedance biosensor based on magnetic nanobead net and MnO 2 nanoflowers for rapid and sensitive detection of foodborne bacteria. Biosens Bioelectron 2020; 173:112800. [PMID: 33186789 DOI: 10.1016/j.bios.2020.112800] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2020] [Revised: 10/14/2020] [Accepted: 11/03/2020] [Indexed: 12/19/2022]
Abstract
Screening of pathogenic bacteria in foods is an effective way to prevent foodborne diseases. In this study, an impedance biosensor was developed for rapid and sensitive detection of Salmonella typhimurium using multiple magnetic nanobead (MNB) nets in a ring channel for continuous-flow separation of target bacteria from 10 mL of sample, manganese dioxide nanoflowers (MnO2 NFs) for efficient amplification of biological signal, and an interdigitated microelectrode for sensitive measurement of impedance change. First, the MNBs modified with capture antibodies were vortically injected from outer periphery of this ring channel to form multiple ring MNB nets at specific locations with high gradient magnetic fields. Then, the bacterial sample was continuous-flow injected, resulting in specific capture of target bacteria onto the nets, and the MnO2 NFs modified with detection antibodies were injected to form MNB-bacteria-MnO2 NF complexes. After the complexes were washed with deionized water to remove excessive nanoflowers and residual ions, H2O2 with poor conductivity was injected to reduce MnO2 NFs to conductive Mn2+ at neutral medium, leading to impedance decrease. Finally, impedance change was measured using the microelectrode for quantitative determination of Salmonella. This biosensor was able to separate ~60% of Salmonella from 10 mL of bacterial sample and detect Salmonella with a linear range of 3.0 × 101 to 3.0 × 106 CFU/mL in 1.5 h with lower detection limit of 19 CFU/mL. This biosensor might be further improved with higher sensitivity using a larger volume (100 mL or more) for routine screening of foodborne bacteria without bacterial pre-culture.
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Affiliation(s)
- Li Xue
- Key Laboratory of Agricultural Information Acquisition Technology, Ministry of Agriculture and Rural Affairs, China Agricultural University, Beijing, 100083, China
| | - Ruya Guo
- Key Laboratory of Modern Precision Agriculture System Integration Research, Ministry of Education, China Agricultural University, Beijing, 100083, China
| | - Fengchun Huang
- Key Laboratory of Modern Precision Agriculture System Integration Research, Ministry of Education, China Agricultural University, Beijing, 100083, China
| | - Wuzhen Qi
- Key Laboratory of Agricultural Information Acquisition Technology, Ministry of Agriculture and Rural Affairs, China Agricultural University, Beijing, 100083, China
| | - Yuanjie Liu
- Key Laboratory of Agricultural Information Acquisition Technology, Ministry of Agriculture and Rural Affairs, China Agricultural University, Beijing, 100083, China
| | - Gaozhe Cai
- Key Laboratory of Modern Precision Agriculture System Integration Research, Ministry of Education, China Agricultural University, Beijing, 100083, China
| | - Jianhan Lin
- Key Laboratory of Agricultural Information Acquisition Technology, Ministry of Agriculture and Rural Affairs, China Agricultural University, Beijing, 100083, China; Key Laboratory of Modern Precision Agriculture System Integration Research, Ministry of Education, China Agricultural University, Beijing, 100083, China.
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Wang L, Lin J. Recent advances on magnetic nanobead based biosensors: From separation to detection. Trends Analyt Chem 2020. [DOI: 10.1016/j.trac.2020.115915] [Citation(s) in RCA: 39] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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An ultrasensitive biosensor for fast detection of Salmonella using 3D magnetic grid separation and urease catalysis. Biosens Bioelectron 2020; 157:112160. [PMID: 32250940 DOI: 10.1016/j.bios.2020.112160] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2019] [Revised: 02/05/2020] [Accepted: 03/17/2020] [Indexed: 12/16/2022]
Abstract
Screening of pathogenic bacteria plays a crucial role in preventing foodborne disease outbreaks. In this study, an ultrasensitive biosensor was developed for fast detection of Salmonella using self-assembled magnetic nanoparticle (MNP) chains for continuous-flow separation of Salmonella from large-volume sample, urease coated gold nanoparticles (GNPs) for specific labelling of Salmonella and efficient amplification of signal, and linear scan voltammetry for sensitive detection of catalysate. First, MNP chains were formed and distributed in a 3D spiral channel using mutually repelling cylindrical magnets and ring iron gears to control anti-Salmonella monoclonal antibody coated MNPs. After bacterial sample was continuous-flow drawn into the channel, bacteria-MNP complexes (magnetic bacteria) were formed on the chains, resulting in specific separation of target bacteria from sample background. Then, anti-Salmonella polyclonal antibodies and urease coated GNPs were drawn to label the magnetic bacteria, resulting in the formation of enzymatic bacteria. After washing to remove residual GNPs, urea was drawn and catalyzed by urease on enzymatic bacteria, resulting in the produce of catalysate (ammonium carbonate). Finally, the catalysate was transferred into a microfluidic chip with a thin-film Ag/AgCl reference electrode array for linear scan voltammetric measurement, and the resistance of catalysate was obtained to determine the amount of target bacteria. This biosensor could quantitatively detect Salmonella from 1.0 × 101 to 1.0 × 106 CFU/mL in 1 h with low detection limit of 101 CFU/mL. The mean recovery for Salmonella in spiked milk was about 104.3%.
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Guo R, Huang F, Cai G, Zheng L, Xue L, Li Y, Liao M, Wang M, Lin J. A colorimetric immunosensor for determination of foodborne bacteria using rotating immunomagnetic separation, gold nanorod indication, and click chemistry amplification. Mikrochim Acta 2020; 187:197. [PMID: 32125533 DOI: 10.1007/s00604-020-4169-z] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2019] [Accepted: 02/13/2020] [Indexed: 11/24/2022]
Abstract
A colorimetric immunosensor was developed for the determination of Salmonella Typhimurium using rotating magnetic separation, gold nanorod (GNR) indication, and click chemistry amplification. The target bacteria were first separated from large-volume sample using a rotating magnetic field and a small amount (50 μg) of immunomagnetic nanoparticles (MNPs), resulting in the forming of magnetic bacteria. Then, the magnetic bacteria were conjugated with catalase (CAT)-labeled antibodies, which were synthesized using trans-cyclooctene/1,2,4,5-tetrazine click chemistry reaction, resulting in the forming of enzymatic bacteria. Then the CATs on the enzymatic bacteria were used to decompose an excessive amount of hydrogen peroxide (H2O2), the remaining H2O2 was mixed with horseradish peroxidase to etch the GNRs, resulting in color change and absorbance peak shift of the GNRs. Finally, the peak shift was measured and analyzed for the quantitative determination of target bacteria. This immunosensor was able to detect Salmonella Typhimurium with a linear range of 101-105 CFU mL-1 in 3 h with a low detection limit of 35 CFU mL-1. The mean recovery for Salmonella Typhimurium in spiked chicken samples was 109%. Graphical abstractSchematic representation of a colorimetric immunosensor for the determination of Salmonella Typhimurium as low as 35 CFU mL-1 using rotating magnetic separation of Salmonella from a large-volume sample, click chemistry reaction of catalase with antibodies for signal amplification, and HRP-mediated gold nanorod etching for result indication.
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Affiliation(s)
- Ruya Guo
- Key Laboratory of Agricultural Information Acquisition Technology, Ministry of Agriculture and Rural Affairs, China Agricultural University, Beijing, 100083, China
| | - Fengchun Huang
- Key Laboratory of Agricultural Information Acquisition Technology, Ministry of Agriculture and Rural Affairs, China Agricultural University, Beijing, 100083, China
| | - Gaozhe Cai
- Key Laboratory of Agricultural Information Acquisition Technology, Ministry of Agriculture and Rural Affairs, China Agricultural University, Beijing, 100083, China
| | - Lingyan Zheng
- Key Laboratory of Modern Precision Agriculture System Integration Research, Ministry of Education, China Agricultural University, Beijing, 100083, China
| | - Li Xue
- Key Laboratory of Modern Precision Agriculture System Integration Research, Ministry of Education, China Agricultural University, Beijing, 100083, China
| | - Yanbin Li
- Department of Biological and Agricultural Engineering, University of Arkansas, Fayetteville, AR, 72701, USA
| | - Ming Liao
- College of Veterinary Medicine, South China Agricultural University, Guangzhou, 510642, China
| | - Maohua Wang
- Key Laboratory of Modern Precision Agriculture System Integration Research, Ministry of Education, China Agricultural University, Beijing, 100083, China
| | - Jianhan Lin
- Key Laboratory of Modern Precision Agriculture System Integration Research, Ministry of Education, China Agricultural University, Beijing, 100083, China.
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Lee H, Kim G, Park E, Jeon S. Lenz's Law-Based Virtual Net for Detection of Pathogenic Bacteria from Water. Anal Chem 2019; 91:15585-15590. [PMID: 31714060 DOI: 10.1021/acs.analchem.9b03636] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
We have developed a method for rapid detection of pathogenic bacteria from water using a virtual net comprising magnetic nanoparticle clusters (MNC). When an external magnetic field was applied to the antibody-functionalized MNC (Ab-MNC) solution in a glass tube (GT), the Ab-MNCs were aligned along the direction of the applied magnetic field to form a wall of MNCs. The injection of a liquid into the GT pushed the MNCs to flow when the drag force exceeded the magnetic force that held the MNCs. In contrast, injection of a liquid into the GT wrapped with a copper tape (Cu-GT) created a magnetic field in the opposite direction of the liquid flow according to Lenz's law, which retained the MNCs inside Cu-GT even at a flow rate 2.5 times higher than the maximum flow rate at which the MNCs were retained inside the GT. As proof of concept, E. coli O157:H7-spiked aqueous solutions were injected into Cu-GT containing Ab-MNCs. The structural flexibility of the Ab-MNC wall allowed the liquid to pass through but induced binding of the bacteria to the Ab-MNC wall, just as the wall acted like a virtual net. The detection limit was 102 CFU/mL of E. coli as measured by an ATP luminometer, and the total assay time was 15 min including 10 min for the isolation and separation steps.
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Affiliation(s)
- Hyeonjeong Lee
- Department of Chemical Engineering , Pohang University of Science and Technology (POSTECH) , Pohang , Gyeongbuk 790-784 , Republic of Korea
| | - Gwanho Kim
- Department of Chemical Engineering , Pohang University of Science and Technology (POSTECH) , Pohang , Gyeongbuk 790-784 , Republic of Korea
| | - Eunjin Park
- Department of Chemical Engineering , Pohang University of Science and Technology (POSTECH) , Pohang , Gyeongbuk 790-784 , Republic of Korea
| | - Sangmin Jeon
- Department of Chemical Engineering , Pohang University of Science and Technology (POSTECH) , Pohang , Gyeongbuk 790-784 , Republic of Korea
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Shanko ES, van de Burgt Y, Anderson PD, den Toonder JMJ. Microfluidic Magnetic Mixing at Low Reynolds Numbers and in Stagnant Fluids. MICROMACHINES 2019; 10:mi10110731. [PMID: 31671753 PMCID: PMC6915455 DOI: 10.3390/mi10110731] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/26/2019] [Revised: 10/17/2019] [Accepted: 10/18/2019] [Indexed: 12/11/2022]
Abstract
Microfluidic mixing becomes a necessity when thorough sample homogenization is required in small volumes of fluid, such as in lab-on-a-chip devices. For example, efficient mixing is extraordinarily challenging in capillary-filling microfluidic devices and in microchambers with stagnant fluids. To address this issue, specifically designed geometrical features can enhance the effect of diffusion and provide efficient mixing by inducing chaotic fluid flow. This scheme is known as “passive” mixing. In addition, when rapid and global mixing is essential, “active” mixing can be applied by exploiting an external source. In particular, magnetic mixing (where a magnetic field acts to stimulate mixing) shows great potential for high mixing efficiency. This method generally involves magnetic beads and external (or integrated) magnets for the creation of chaotic motion in the device. However, there is still plenty of room for exploiting the potential of magnetic beads for mixing applications. Therefore, this review article focuses on the advantages of magnetic bead mixing along with recommendations on improving mixing in low Reynolds number flows (Re ≤ 1) and in stagnant fluids.
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Affiliation(s)
- Eriola-Sophia Shanko
- Department of Mechanical Engineering, Microsystems Research Section, and Institute for Complex Molecular Systems (ICMS), Technische Universiteit Eindhoven, P.O. Box 513, 5600 MB Eindhoven, The Netherlands.
| | - Yoeri van de Burgt
- Department of Mechanical Engineering, Microsystems Research Section, and Institute for Complex Molecular Systems (ICMS), Technische Universiteit Eindhoven, P.O. Box 513, 5600 MB Eindhoven, The Netherlands.
| | - Patrick D Anderson
- Department of Mechanical Engineering, Polymer Technology Research Section, and Institute for Complex Molecular Systems (ICMS), Technische Universiteit Eindhoven, P.O. Box 513, 5600 MB Eindhoven, The Netherlands.
| | - Jaap M J den Toonder
- Department of Mechanical Engineering, Microsystems Research Section, and Institute for Complex Molecular Systems (ICMS), Technische Universiteit Eindhoven, P.O. Box 513, 5600 MB Eindhoven, The Netherlands.
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14
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Cai G, Wang S, Zheng L, Lin J. A Fluidic Device for Immunomagnetic Separation of Foodborne Bacteria Using Self-Assembled Magnetic Nanoparticle Chains. MICROMACHINES 2018; 9:mi9120624. [PMID: 30486364 PMCID: PMC6315333 DOI: 10.3390/mi9120624] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/26/2018] [Revised: 11/22/2018] [Accepted: 11/23/2018] [Indexed: 12/12/2022]
Abstract
Immunomagnetic separation has been widely used for the separation and concentration of foodborne pathogens from complex food samples, however it can only handle a small volume of samples. In this paper, we presented a novel fluidic device for the specific and efficient separation and concentration of salmonellatyphimurium using self-assembled magnetic nanoparticle chains. The laminated sawtooth-shaped iron foils were first mounted in the 3D-printed matrix and magnetized by a strong magnet to generate dot-array high gradient magnetic fields in the fluidic channel, which was simulated using COMSOL (5.3a, Burlington, MA, USA). Then, magnetic nanoparticles with a diameter of 150 nm, which were modified with the anti-salmonella polyclonal antibodies, were injected into the channel, and the magnetic nanoparticle chains were vertically formed at the dots and verified using a fluorescence inverted microscope. Finally, the bacterial sample was continuous-flow injected, and the target bacteria could be captured by the antibodies on the chains, followed by gold standard culture plating to determine the amount of the target bacteria. Under the optimal conditions, the target bacteria could be separated with a separation efficiency of 80% in 45 min. This fluidic device could be further improved using thinner sawtooth-shaped iron foils and stronger magnets to obtain a better dot-array magnetic field with larger magnetic intensity and denser dot distribution, and has the potential to be integrated with the existing biological assays for rapid and sensitive detection of foodborne bacteria.
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Affiliation(s)
- Gaozhe Cai
- Key Laboratory of Agricultural Information Acquisition Technology, Ministry of Agriculture, China Agricultural University, Beijing 100083, China.
| | - Siyuan Wang
- Key Laboratory of Modern Precision Agriculture System Integration Research, Ministry of Education, China Agricultural University, Beijing 100083, China.
| | - Lingyan Zheng
- Key Laboratory of Modern Precision Agriculture System Integration Research, Ministry of Education, China Agricultural University, Beijing 100083, China.
| | - Jianhan Lin
- Key Laboratory of Agricultural Information Acquisition Technology, Ministry of Agriculture, China Agricultural University, Beijing 100083, China.
- Key Laboratory of Modern Precision Agriculture System Integration Research, Ministry of Education, China Agricultural University, Beijing 100083, China.
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15
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Bruch R, Kling A, Urban GA, Dincer C. Dry Film Photoresist-based Electrochemical Microfluidic Biosensor Platform: Device Fabrication, On-chip Assay Preparation, and System Operation. J Vis Exp 2017:56105. [PMID: 28994807 PMCID: PMC5752260 DOI: 10.3791/56105] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022] Open
Abstract
In recent years, biomarker diagnostics became an indispensable tool for the diagnosis of human disease, especially for the point-of-care diagnostics. An easy-to-use and low-cost sensor platform is highly desired to measure various types of analytes (e.g., biomarkers, hormones, and drugs) quantitatively and specifically. For this reason, dry film photoresist technology - enabling cheap, facile, and high-throughput fabrication - was used to manufacture the microfluidic biosensor presented here. Depending on the bioassay used afterwards, the versatile platform is capable of detecting various types of biomolecules. For the fabrication of the device, platinum electrodes are structured on a flexible polyimide (PI) foil in the only clean-room process step. The PI foil serves as a substrate for the electrodes, which are insulated with an epoxy-based photoresist. The microfluidic channel is subsequently generated by the development and lamination of dry film photoresist (DFR) foils onto the PI wafer. By using a hydrophobic stopping barrier in the channel, the channel is separated into two specific areas: an immobilization section for the enzyme-linked assay and an electrochemical measurement cell for the amperometric signal readout. The on-chip bioassay immobilization is performed by the adsorption of the biomolecules to the channel surface. The glucose oxidase enzyme is used as a transducer for electrochemical signal generation. In the presence of the substrate, glucose, hydrogen peroxide is produced, which is detected at the platinum working electrode. The stop-flow technique is applied to obtain signal amplification along with rapid detection. Different biomolecules can quantitatively be measured by means of the introduced microfluidic system, giving an indication of different types of diseases, or, in regard to therapeutic drug monitoring, facilitating a personalized therapy.
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Affiliation(s)
- Richard Bruch
- Department of Microsystems Engineering, University of Freiburg
| | - André Kling
- Department of Microsystems Engineering, University of Freiburg; Department of Biosystems Science and Engineering, ETH Zurich
| | - Gerald A Urban
- Department of Microsystems Engineering, University of Freiburg; Freiburg Materials Research Center, University of Freiburg
| | - Can Dincer
- Department of Microsystems Engineering, University of Freiburg; Freiburg Materials Research Center, University of Freiburg;
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16
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Bruch R, Chatelle C, Kling A, Rebmann B, Wirth S, Schumann S, Weber W, Dincer C, Urban G. Clinical on-site monitoring of ß-lactam antibiotics for a personalized antibiotherapy. Sci Rep 2017; 7:3127. [PMID: 28600499 PMCID: PMC5466632 DOI: 10.1038/s41598-017-03338-z] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2017] [Accepted: 04/26/2017] [Indexed: 01/07/2023] Open
Abstract
An appropriate antibiotherapy is crucial for the safety and recovery of patients. Depending on the clinical conditions of patients, the required dose to effectively eradicate an infection may vary. An inadequate dosing not only reduces the efficacy of the antibiotic, but also promotes the emergence of antimicrobial resistances. Therefore, a personalized therapy is of great interest for improved patients' outcome and will reduce in long-term the prevalence of multidrug-resistances. In this context, on-site monitoring of the antibiotic blood concentration is fundamental to facilitate an individual adjustment of the antibiotherapy. Herein, we present a bioinspired approach for the bedside monitoring of free accessible ß-lactam antibiotics, including penicillins (piperacillin) and cephalosporins (cefuroxime and cefazolin) in untreated plasma samples. The introduced system combines a disposable microfluidic chip with a naturally occurring penicillin-binding protein, resulting in a high-performance platform, capable of gauging very low antibiotic concentrations (less than 6 ng ml-1) from only 1 µl of serum. The system's applicability to a personalized antibiotherapy was successfully demonstrated by monitoring the pharmacokinetics of patients, treated with ß-lactam antibiotics, undergoing surgery.
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Affiliation(s)
- R Bruch
- Department of Microsystems Engineering, University of Freiburg, 79110, Freiburg, Germany
| | - C Chatelle
- Faculty of Biology, University of Freiburg, 79104, Freiburg, Germany.,BIOSS Centre for Biological Signalling Studies, University of Freiburg, 79104, Freiburg, Germany
| | - A Kling
- Department of Biosystems Science and Engineering, ETH Zurich, 4058, Basel, Switzerland
| | - B Rebmann
- Faculty of Biology, University of Freiburg, 79104, Freiburg, Germany.,BIOSS Centre for Biological Signalling Studies, University of Freiburg, 79104, Freiburg, Germany
| | - S Wirth
- Department of Anaesthesiology and Critical Care, Medical Center - University of Freiburg, Faculty of Medicine, University of Freiburg, 79106, Freiburg, Germany
| | - S Schumann
- Department of Anaesthesiology and Critical Care, Medical Center - University of Freiburg, Faculty of Medicine, University of Freiburg, 79106, Freiburg, Germany
| | - W Weber
- Faculty of Biology, University of Freiburg, 79104, Freiburg, Germany.,BIOSS Centre for Biological Signalling Studies, University of Freiburg, 79104, Freiburg, Germany
| | - C Dincer
- Department of Microsystems Engineering, University of Freiburg, 79110, Freiburg, Germany. .,Freiburg Materials Research Center, University of Freiburg, 79104, Freiburg, Germany.
| | - G Urban
- Department of Microsystems Engineering, University of Freiburg, 79110, Freiburg, Germany.,Freiburg Materials Research Center, University of Freiburg, 79104, Freiburg, Germany
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17
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Cao L, Fang C, Zeng R, Zhao X, Jiang Y, Chen Z. Paper-based microfluidic devices for electrochemical immunofiltration analysis of human chorionic gonadotropin. Biosens Bioelectron 2017; 92:87-94. [DOI: 10.1016/j.bios.2017.02.002] [Citation(s) in RCA: 68] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2016] [Revised: 01/24/2017] [Accepted: 02/01/2017] [Indexed: 12/21/2022]
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18
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Guo Y, Huang J, Xiao F, Yin X, Chun J, Um W, Neeves KB, Wu N. Bead-Based Microfluidic Sediment Analogues: Fabrication and Colloid Transport. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:9342-9350. [PMID: 27548505 DOI: 10.1021/acs.langmuir.6b02184] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Mobile colloids can act as carriers for low-solubility contaminants in the environment. However, the dominant mechanism for this colloid-facilitated transport of chemicals is unclear. Therefore, we developed a bead-based microfluidic platform of sediment analogues and measured both single and population transport of model colloids. The porous medium is assembled through a bead-by-bead injection method. This approach has the versatility to build both electrostatically homogeneous and heterogeneous media at the pore scale. A T-junction at the exit also allowed for encapsulation and enumeration of colloids effluent at single particle resolution to give population dynamics. Tortuosity calculated from pore-scale trajectory analysis and its comparison with lattice Boltzmann simulations revealed that transport of colloids was influenced by the size exclusion effect. The porous media packed by positively and negatively charged beads into two layers showed distinctive colloidal particle retention and significant remobilization and re-adsorption of particles during water flushing. We demonstrated the potential of our method to fabricate porous media with surface heterogeneities at the pore scale. With both single and population dynamics measurement, our platform has the potential to connect pore-scale and macroscale colloid transport on a lab scale and to quantify the impact of grain surface heterogeneities that are natural in the subsurface environment.
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Affiliation(s)
- Yang Guo
- Department of Chemical and Biological Engineering, Colorado School of Mines , Golden, Colorado 80401, United States
| | - Jingwei Huang
- Department of Petroleum Engineering, Colorado School of Mines , Golden, Colorado 80401, United States
| | - Feng Xiao
- Department of Petroleum Engineering, Colorado School of Mines , Golden, Colorado 80401, United States
| | - Xiaolong Yin
- Department of Petroleum Engineering, Colorado School of Mines , Golden, Colorado 80401, United States
| | - Jaehun Chun
- Pacific Northwest National Laboratory , 902 Battelle Boulevard, Richland, Washington 99352, United States
| | - Wooyong Um
- Pacific Northwest National Laboratory , 902 Battelle Boulevard, Richland, Washington 99352, United States
| | - Keith B Neeves
- Department of Chemical and Biological Engineering, Colorado School of Mines , Golden, Colorado 80401, United States
| | - Ning Wu
- Department of Chemical and Biological Engineering, Colorado School of Mines , Golden, Colorado 80401, United States
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19
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Kling A, Chatelle C, Armbrecht L, Qelibari E, Kieninger J, Dincer C, Weber W, Urban G. Multianalyte Antibiotic Detection on an Electrochemical Microfluidic Platform. Anal Chem 2016; 88:10036-10043. [DOI: 10.1021/acs.analchem.6b02294] [Citation(s) in RCA: 60] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- André Kling
- University of Freiburg, Department of Microsystems
Engineering, Georges-Koehler-Allee
103, DE-79110 Freiburg, Germany
| | - Claire Chatelle
- University of Freiburg, Faculty of Biology and Centre
for Biological Signalling Studies, Schänzlestraße 18, DE-79104 Freiburg, Germany
| | - Lucas Armbrecht
- University of Freiburg, Department of Microsystems
Engineering, Georges-Koehler-Allee
103, DE-79110 Freiburg, Germany
| | - Edvina Qelibari
- University of Freiburg, Department of Microsystems
Engineering, Georges-Koehler-Allee
103, DE-79110 Freiburg, Germany
| | - Jochen Kieninger
- University of Freiburg, Department of Microsystems
Engineering, Georges-Koehler-Allee
103, DE-79110 Freiburg, Germany
| | - Can Dincer
- University of Freiburg, Department of Microsystems
Engineering, Georges-Koehler-Allee
103, DE-79110 Freiburg, Germany
- University of Freiburg, Freiburg Materials Research
Center, Stefan-Meier-Straße
21, DE-79104 Freiburg, Germany
| | - Wilfried Weber
- University of Freiburg, Faculty of Biology and Centre
for Biological Signalling Studies, Schänzlestraße 18, DE-79104 Freiburg, Germany
| | - Gerald Urban
- University of Freiburg, Department of Microsystems
Engineering, Georges-Koehler-Allee
103, DE-79110 Freiburg, Germany
- University of Freiburg, Freiburg Materials Research
Center, Stefan-Meier-Straße
21, DE-79104 Freiburg, Germany
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20
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Affiliation(s)
- Bingbing Gao
- State Key Laboratory of Bioelectronics,
School of Biological Science and Medical Engineering, Southeast University, Nanjing 210096, China
| | - Hong Liu
- State Key Laboratory of Bioelectronics,
School of Biological Science and Medical Engineering, Southeast University, Nanjing 210096, China
| | - Zhongze Gu
- State Key Laboratory of Bioelectronics,
School of Biological Science and Medical Engineering, Southeast University, Nanjing 210096, China
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21
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Phurimsak C, Tarn MD, Pamme N. Magnetic Particle Plug-Based Assays for Biomarker Analysis. MICROMACHINES 2016; 7:E77. [PMID: 30404252 PMCID: PMC6190463 DOI: 10.3390/mi7050077] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/13/2016] [Revised: 04/01/2016] [Accepted: 04/13/2016] [Indexed: 01/08/2023]
Abstract
Conventional immunoassays offer selective and quantitative detection of a number of biomarkers, but are laborious and time-consuming. Magnetic particle-based assays allow easy and rapid selection of analytes, but still suffer from the requirement of tedious multiple reaction and washing steps. Here, we demonstrate the trapping of functionalised magnetic particles within a microchannel for performing rapid immunoassays by flushing consecutive reagent and washing solutions over the trapped particle plug. Three main studies were performed to investigate the potential of the platform for quantitative analysis of biomarkers: (i) a streptavidin-biotin binding assay; (ii) a sandwich assay of the inflammation biomarker, C-reactive protein (CRP); and (iii) detection of the steroid hormone, progesterone (P4), towards a competitive assay. Quantitative analysis with low limits of detection was demonstrated with streptavidin-biotin, while the CRP and P4 assays exhibited the ability to detect clinically relevant analytes, and all assays were completed in only 15 min. These preliminary results show the great potential of the platform for performing rapid, low volume magnetic particle plug-based assays of a range of clinical biomarkers via an exceedingly simple technique.
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Affiliation(s)
- Chayakom Phurimsak
- Department of Chemistry, University of Hull, Cottingham Road, Hull, HU6 7RX, UK.
| | - Mark D Tarn
- Department of Chemistry, University of Hull, Cottingham Road, Hull, HU6 7RX, UK.
| | - Nicole Pamme
- Department of Chemistry, University of Hull, Cottingham Road, Hull, HU6 7RX, UK.
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22
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Dincer C, Kling A, Chatelle C, Armbrecht L, Kieninger J, Weber W, Urban GA. Designed miniaturization of microfluidic biosensor platforms using the stop-flow technique. Analyst 2016; 141:6073-6079. [DOI: 10.1039/c6an01330a] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Here, we present a novel approach to increase the degree of miniaturization as well as the sensitivity of biosensor platforms by the optimization of microfluidic stop-flow techniques independent of the applied detection technique (e.g. electrochemical or optical).
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Affiliation(s)
- C. Dincer
- Laboratory for Sensors
- Department of Microsystems Engineering - IMTEK
- University of Freiburg
- Germany
- Freiburg Materials Research Center - FMF
| | - A. Kling
- Laboratory for Sensors
- Department of Microsystems Engineering - IMTEK
- University of Freiburg
- Germany
| | - C. Chatelle
- Centre for Biological Signalling Studies - BIOSS
- Germany
- Faculty of Biology
- University of Freiburg
- Germany
| | - L. Armbrecht
- Laboratory for Sensors
- Department of Microsystems Engineering - IMTEK
- University of Freiburg
- Germany
| | - J. Kieninger
- Laboratory for Sensors
- Department of Microsystems Engineering - IMTEK
- University of Freiburg
- Germany
| | - W. Weber
- Centre for Biological Signalling Studies - BIOSS
- Germany
- Faculty of Biology
- University of Freiburg
- Germany
| | - G. A. Urban
- Laboratory for Sensors
- Department of Microsystems Engineering - IMTEK
- University of Freiburg
- Germany
- Freiburg Materials Research Center - FMF
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