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Wang C, Qiu J, Liu M, Wang Y, Yu Y, Liu H, Zhang Y, Han L. Microfluidic Biochips for Single-Cell Isolation and Single-Cell Analysis of Multiomics and Exosomes. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2024; 11:e2401263. [PMID: 38767182 PMCID: PMC11267386 DOI: 10.1002/advs.202401263] [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: 02/02/2024] [Revised: 04/26/2024] [Indexed: 05/22/2024]
Abstract
Single-cell multiomic and exosome analyses are potent tools in various fields, such as cancer research, immunology, neuroscience, microbiology, and drug development. They facilitate the in-depth exploration of biological systems, providing insights into disease mechanisms and aiding in treatment. Single-cell isolation, which is crucial for single-cell analysis, ensures reliable cell isolation and quality control for further downstream analyses. Microfluidic chips are small lightweight systems that facilitate efficient and high-throughput single-cell isolation and real-time single-cell analysis on- or off-chip. Therefore, most current single-cell isolation and analysis technologies are based on the single-cell microfluidic technology. This review offers comprehensive guidance to researchers across different fields on the selection of appropriate microfluidic chip technologies for single-cell isolation and analysis. This review describes the design principles, separation mechanisms, chip characteristics, and cellular effects of various microfluidic chips available for single-cell isolation. Moreover, this review highlights the implications of using this technology for subsequent analyses, including single-cell multiomic and exosome analyses. Finally, the current challenges and future prospects of microfluidic chip technology are outlined for multiplex single-cell isolation and multiomic and exosome analyses.
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Affiliation(s)
- Chao Wang
- Institute of Marine Science and TechnologyShandong UniversityQingdao266237China
| | - Jiaoyan Qiu
- Institute of Marine Science and TechnologyShandong UniversityQingdao266237China
| | - Mengqi Liu
- Institute of Marine Science and TechnologyShandong UniversityQingdao266237China
| | - Yihe Wang
- Institute of Marine Science and TechnologyShandong UniversityQingdao266237China
| | - Yang Yu
- Department of PeriodontologySchool and Hospital of StomatologyCheeloo College of MedicineShandong UniversityJinan250100China
| | - Hong Liu
- State Key Laboratory of Crystal MaterialsShandong UniversityJinan250100China
| | - Yu Zhang
- Institute of Marine Science and TechnologyShandong UniversityQingdao266237China
| | - Lin Han
- Institute of Marine Science and TechnologyShandong UniversityQingdao266237China
- Shandong Engineering Research Center of Biomarker and Artificial Intelligence ApplicationJinan250100China
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Panklang N, Techaumnat B, Tanthanuch N, Chotivanich K, Horprathum M, Nakano M. On-Chip Impedance Spectroscopy of Malaria-Infected Red Blood Cells. SENSORS (BASEL, SWITZERLAND) 2024; 24:3186. [PMID: 38794040 PMCID: PMC11125259 DOI: 10.3390/s24103186] [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: 04/03/2024] [Revised: 04/30/2024] [Accepted: 05/10/2024] [Indexed: 05/26/2024]
Abstract
Malaria is a disease that affects millions of people worldwide, particularly in developing countries. The development of accurate and efficient methods for the detection of malaria-infected cells is crucial for effective disease management and control. This paper presents the electrical impedance spectroscopy (EIS) of normal and malaria-infected red blood cells. An EIS microfluidic device, comprising a microchannel and a pair of coplanar electrodes, was fabricated for single-cell measurements in a continuous manner. Based on the EIS results, the aim of this work is to discriminate Plasmodium falciparum-infected red blood cells from the normal ones. Different from typical impedance spectroscopy, our measurement was performed for the cells in a low-conductivity medium in a frequency range between 50 kHz and 800 kHz. Numerical simulation was utilized to study the suitability parameters of the microchannel and electrodes for the EIS experiment over the measurement frequencies. The measurement results have shown that by using the low-conductivity medium, we could focus on the change in the conductance caused by the presence of a cell in the sensing electrode gap. The results indicated a distinct frequency spectrum of the conductance between the normal and infected red blood cells, which can be further used for the detection of the disease.
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Affiliation(s)
- Nitipong Panklang
- Department of Electrical Engineering, Faculty of Engineering, Rajamangala University of Technology Thanyaburi, Pathum Thani 12110, Thailand;
| | - Boonchai Techaumnat
- Department of Electrical Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok 10330, Thailand
- Micro/Nano-Electro-Mechanical Integrated System Research Unit, Faculty of Engineering, Chulalongkorn University, Bangkok 10330, Thailand
| | - Nutthaphong Tanthanuch
- Department of Electrical and Computer Engineering, Faculty of Engineering, Thammasat School of Engineering, Thammasat University, Pathum Thani 12120, Thailand;
| | - Kesinee Chotivanich
- Cell and Tissue Culture Resources Unit, Department of Clinical Tropical Medicine, Faculty of Tropical Medicine, Mahidol University, Bangkok 10400, Thailand;
| | - Mati Horprathum
- Spectroscopic and Sensing Devices Research Group, NECTEC, NSTDA, Pathum Thani 12120, Thailand;
| | - Michihiko Nakano
- Faculty of Information Science and Electrical Engineering, Kyushu University, Fukuoka 819-0395, Japan;
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Shi BW, Zhao JM, Wang YK, Wang YX, Jiang YF, Yang GL, Wang J, Qiang T. Real-Time Detection of Yeast Growth on Solid Medium through Passive Microresonator Biosensor. BIOSENSORS 2024; 14:216. [PMID: 38785692 PMCID: PMC11117844 DOI: 10.3390/bios14050216] [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: 03/26/2024] [Revised: 04/18/2024] [Accepted: 04/23/2024] [Indexed: 05/25/2024]
Abstract
This study presents a biosensor fabricated based on integrated passive device (IPD) technology to measure microbial growth on solid media in real-time. Yeast (Pichia pastoris, strain GS115) is used as a model organism to demonstrate biosensor performance. The biosensor comprises an interdigital capacitor in the center with a helical inductive structure surrounding it. Additionally, 12 air bridges are added to the capacitor to increase the strength of the electric field radiated by the biosensor at the same height. Feasibility is verified by using a capacitive biosensor, and the change in capacitance values during the capacitance detection process with the growth of yeast indicates that the growth of yeast can induce changes in electrical parameters. The proposed IPD-based biosensor is used to measure yeast drop-added on a 3 mm medium for 100 h at an operating frequency of 1.84 GHz. The resonant amplitude of the biosensor varies continuously from 24 to 72 h due to the change in colony height during vertical growth of the yeast, with a maximum change of 0.21 dB. The overall measurement results also fit well with the Gompertz curve. The change in resonant amplitude between 24 and 72 h is then analyzed and reveals a linear relationship with time with a coefficient of determination of 0.9844, indicating that the biosensor is suitable for monitoring yeast growth. Thus, the proposed biosensor is proved to have potential in the field of microbial proliferation detection.
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Affiliation(s)
- Bo-Wen Shi
- School of Internet of Things Engineering, Institute of Advanced Technology, Jiangnan University, Wuxi 214122, China; (B.-W.S.); (J.-M.Z.); (Y.-K.W.); (Y.-X.W.); (Y.-F.J.)
| | - Jun-Ming Zhao
- School of Internet of Things Engineering, Institute of Advanced Technology, Jiangnan University, Wuxi 214122, China; (B.-W.S.); (J.-M.Z.); (Y.-K.W.); (Y.-X.W.); (Y.-F.J.)
| | - Yi-Ke Wang
- School of Internet of Things Engineering, Institute of Advanced Technology, Jiangnan University, Wuxi 214122, China; (B.-W.S.); (J.-M.Z.); (Y.-K.W.); (Y.-X.W.); (Y.-F.J.)
| | - Yan-Xiong Wang
- School of Internet of Things Engineering, Institute of Advanced Technology, Jiangnan University, Wuxi 214122, China; (B.-W.S.); (J.-M.Z.); (Y.-K.W.); (Y.-X.W.); (Y.-F.J.)
| | - Yan-Feng Jiang
- School of Internet of Things Engineering, Institute of Advanced Technology, Jiangnan University, Wuxi 214122, China; (B.-W.S.); (J.-M.Z.); (Y.-K.W.); (Y.-X.W.); (Y.-F.J.)
| | - Gang-Long Yang
- State Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China;
- Key Laboratory of Biopharmaceutical Preparation and Delivery, Chinese Academy of Sciences, Beijing 100190, China
| | - Jicheng Wang
- School of Science, Jiangsu Provincial Research Center of Light Industrial Optoelectronic Engineering and Technology, Jiangnan University, Wuxi 214122, China;
| | - Tian Qiang
- School of Internet of Things Engineering, Institute of Advanced Technology, Jiangnan University, Wuxi 214122, China; (B.-W.S.); (J.-M.Z.); (Y.-K.W.); (Y.-X.W.); (Y.-F.J.)
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Tang B, Liu M, Dietzel A. Low-Cost Impedance Camera for Cell Distribution Monitoring. BIOSENSORS 2023; 13:281. [PMID: 36832047 PMCID: PMC9954133 DOI: 10.3390/bios13020281] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/15/2022] [Revised: 01/31/2023] [Accepted: 02/13/2023] [Indexed: 06/18/2023]
Abstract
Electrical impedance spectroscopy (EIS) is widely recognized as a powerful tool in biomedical research. For example, it allows detection and monitoring of diseases, measuring of cell density in bioreactors, and characterizing the permeability of tight junctions in barrier-forming tissue models. However, with single-channel measurement systems, only integral information is obtained without spatial resolution. Here we present a low-cost multichannel impedance measurement set-up capable of mapping cell distributions in a fluidic environment by using a microelectrode array (MEA) realized in 4-level printed circuit board (PCB) technology including layers for shielding, interconnections, and microelectrodes. The array of 8 × 8 gold microelectrode pairs was connected to home-built electric circuitry consisting of commercial components such as programmable multiplexers and an analog front-end module which allows the acquisition and processing of electrical impedances. For a proof-of-concept, the MEA was wetted in a 3D printed reservoir into which yeast cells were locally injected. Impedance maps were recorded at 200 kHz which correlate well with the optical images showing the yeast cell distribution in the reservoir. Blurring from parasitic currents slightly disturbing the impedance maps could be eliminated by deconvolution using an experimentally determined point spread function. The MEA of the impedance camera can in future be further miniaturized and integrated into cell cultivation and perfusion systems such as organ on chip devices to augment or even replace light microscopic monitoring of cell monolayer confluence and integrity during the cultivation in incubation chambers.
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Affiliation(s)
- Bo Tang
- Institute of Microtechnology (IMT), Technische Universität Brauschweig, Alte Salzdahlumer Str. 203, 38124 Brauschweig, Germany
- Center of Pharmaceutical Engineering (PVZ), Technische Universitãt Braunschweig, Franz-Liszt-Straße 35a, 38106 Braunschweig, Germany
| | - Mengxi Liu
- Institute of Microtechnology (IMT), Technische Universität Brauschweig, Alte Salzdahlumer Str. 203, 38124 Brauschweig, Germany
| | - Andreas Dietzel
- Institute of Microtechnology (IMT), Technische Universität Brauschweig, Alte Salzdahlumer Str. 203, 38124 Brauschweig, Germany
- Center of Pharmaceutical Engineering (PVZ), Technische Universitãt Braunschweig, Franz-Liszt-Straße 35a, 38106 Braunschweig, Germany
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Showkat I, Khanday FA, Beigh MR. A review of bio-impedance devices. Med Biol Eng Comput 2023; 61:927-950. [PMID: 36637716 DOI: 10.1007/s11517-022-02763-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2022] [Accepted: 12/27/2022] [Indexed: 01/14/2023]
Abstract
Bio-impedance measurement analysis primarily refers to a safe and a non-invasive technique to analyze the electrical changes in living tissues on the application of low-value alternating current. It finds applications both in the biomedical and the agricultural fields. This paper concisely reviews the origin and measurement approaches for concepts and fundamentals of bio-impedance followed by a critical review on bio-impedance portable devices with main emphasis on the embedded system approach which is in demand due to its miniature size and present lifestyle preference of monitoring health in real time. The paper also provides a comprehensive review of various bio-impedance circuits with emphasis on the measurement and calibration techniques.
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Affiliation(s)
- Insha Showkat
- Department of Electronics and Instrumentation Technology, University of Kashmir, Hazratbal, Srinagar, Jammu and Kashmir, India
| | - Farooq A Khanday
- Department of Electronics and Instrumentation Technology, University of Kashmir, Hazratbal, Srinagar, Jammu and Kashmir, India.
| | - M Rafiq Beigh
- Department of Electronics, Govt. Degree College Sumbal, Sumbal, J&K, India
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Chmayssem A, Tanase CE, Verplanck N, Gougis M, Mourier V, Zebda A, Ghaemmaghami AM, Mailley P. New Microfluidic System for Electrochemical Impedance Spectroscopy Assessment of Cell Culture Performance: Design and Development of New Electrode Material. BIOSENSORS 2022; 12:bios12070452. [PMID: 35884254 PMCID: PMC9313146 DOI: 10.3390/bios12070452] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/19/2022] [Revised: 06/20/2022] [Accepted: 06/21/2022] [Indexed: 06/01/2023]
Abstract
Electrochemical impedance spectroscopy (EIS) is widely accepted as an effective and non-destructive method to assess cell health during cell-culture. However, there is a lack of compact devices compatible with microfluidic integration and microscopy that could provide the real-time and non-invasive monitoring of cell-cultures using EIS. In this paper, we reported the design and characterization of a modular EIS testing system based on a patented technology. This device was fabricated using easily processable methodologies including screen-printing of the impedance electrodes and molding or micromachining of the cell culture chamber with an easy assembly procedure. Accordingly, to obtain processable, biocompatible and sterilizable electrode materials that lower the impact of interfacial impedance on TEER (Transepithelial electrical resistance) measurements, and to enable concomitant microscopy observations, we optimized the formulation of the electrode inks and the design of the EIS electrodes, respectively. First, electrode materials were based on carbon biocompatible inks enriched with IrOx particles to obtain low interfacial impedance electrodes approaching the performances of classical non-biocompatible Ag/AgCl second-species electrodes. Secondly, we proposed three original electrode designs, which were compared to classical disk electrodes that were optically compatible with microscopy. We assessed the impact of the electrode design on the response of the impedance sensor using COMSOL Multiphysics. Finally, the performance of the impedance spectroscopy devices was assessed in vitro using human airway epithelial cell cultures.
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Affiliation(s)
- Ayman Chmayssem
- University Grenoble Alpes, CEA, LETI, DTBS, F-38000 Grenoble, France; (N.V.); (M.G.); (V.M.)
- University Grenoble Alpes, TIMC-IMAG/CNRS/INSERM, UMR 5525, F-38000 Grenoble, France;
| | - Constantin Edi Tanase
- Immunology & Immuno-Bioengineering Group, School of Life Sciences, Faculty of Medicine & Health Sciences, University of Nottingham, Nottingham NG7 2RD, UK; (C.E.T.); (A.M.G.)
| | - Nicolas Verplanck
- University Grenoble Alpes, CEA, LETI, DTBS, F-38000 Grenoble, France; (N.V.); (M.G.); (V.M.)
| | - Maxime Gougis
- University Grenoble Alpes, CEA, LETI, DTBS, F-38000 Grenoble, France; (N.V.); (M.G.); (V.M.)
| | - Véronique Mourier
- University Grenoble Alpes, CEA, LETI, DTBS, F-38000 Grenoble, France; (N.V.); (M.G.); (V.M.)
| | - Abdelkader Zebda
- University Grenoble Alpes, TIMC-IMAG/CNRS/INSERM, UMR 5525, F-38000 Grenoble, France;
| | - Amir M. Ghaemmaghami
- Immunology & Immuno-Bioengineering Group, School of Life Sciences, Faculty of Medicine & Health Sciences, University of Nottingham, Nottingham NG7 2RD, UK; (C.E.T.); (A.M.G.)
| | - Pascal Mailley
- University Grenoble Alpes, CEA, LETI, DTBS, F-38000 Grenoble, France; (N.V.); (M.G.); (V.M.)
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Mirisola MG, Longo VD. Yeast Chronological Lifespan: Longevity Regulatory Genes and Mechanisms. Cells 2022; 11:cells11101714. [PMID: 35626750 PMCID: PMC9139625 DOI: 10.3390/cells11101714] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2022] [Revised: 05/14/2022] [Accepted: 05/18/2022] [Indexed: 02/04/2023] Open
Abstract
S. cerevisiae plays a pivotal role as a model system in understanding the biochemistry and molecular biology of mammals including humans. A considerable portion of our knowledge on the genes and pathways involved in cellular growth, resistance to toxic agents, and death has in fact been generated using this model organism. The yeast chronological lifespan (CLS) is a paradigm to study age-dependent damage and longevity. In combination with powerful genetic screening and high throughput technologies, the CLS has allowed the identification of longevity genes and pathways but has also introduced a unicellular “test tube” model system to identify and study macromolecular and cellular damage leading to diseases. In addition, it has played an important role in studying the nutrients and dietary regimens capable of affecting stress resistance and longevity and allowing the characterization of aging regulatory networks. The parallel description of the pro-aging roles of homologs of RAS, S6 kinase, adenylate cyclase, and Tor in yeast and in higher eukaryotes in S. cerevisiae chronological survival studies is valuable to understand human aging and disease. Here we review work on the S. cerevisiae chronological lifespan with a focus on the genes regulating age-dependent macromolecular damage and longevity extension.
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Affiliation(s)
- Mario G. Mirisola
- Department of Surgery, Oncology and Oral Sciences, University of Palermo, Via del Vespro 129, 90127 Palermo, Italy
- Correspondence: (M.G.M.); (V.D.L.)
| | - Valter D. Longo
- Department of Biological Sciences, Longevity Institute, Leonard Davis School of Gerontology, University of Southern California, Los Angeles, CA 90089, USA
- IFOM, FIRC Institute of Molecular Oncology, 20139 Milan, Italy
- Correspondence: (M.G.M.); (V.D.L.)
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Zhou C, Shen H, Feng H, Yan Z, Ji B, Yuan X, Zhang R, Chang H. Enhancing signals of microfluidic impedance cytometry through optimization of microelectrode array. Electrophoresis 2022; 43:2156-2164. [DOI: 10.1002/elps.202100351] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2021] [Revised: 12/30/2021] [Accepted: 01/11/2022] [Indexed: 12/19/2022]
Affiliation(s)
- Chenyang Zhou
- Unmanned System Research Institute Northwestern Polytechnical University Xi'an P. R. China
- MOE Key Laboratory of Micro and Nano Systems for Aerospace Northwestern Polytechnical University Xi'an P. R. China
| | - Hailong Shen
- Unmanned System Research Institute Northwestern Polytechnical University Xi'an P. R. China
- MOE Key Laboratory of Micro and Nano Systems for Aerospace Northwestern Polytechnical University Xi'an P. R. China
| | - Huicheng Feng
- Unmanned System Research Institute Northwestern Polytechnical University Xi'an P. R. China
- MOE Key Laboratory of Micro and Nano Systems for Aerospace Northwestern Polytechnical University Xi'an P. R. China
| | - Zhibin Yan
- Guangdong Provincial Key Laboratory of Optical Information Materials and Technology & Institute of Electronic Paper Displays, South China Academy of Advanced Optoelectronics South China Normal University Guangzhou P. R. China
- National Center for International Research on Green Optoelectronics South China Normal University Guangzhou P. R. China
| | - Bowen Ji
- Unmanned System Research Institute Northwestern Polytechnical University Xi'an P. R. China
- MOE Key Laboratory of Micro and Nano Systems for Aerospace Northwestern Polytechnical University Xi'an P. R. China
| | - Xichen Yuan
- MOE Key Laboratory of Micro and Nano Systems for Aerospace Northwestern Polytechnical University Xi'an P. R. China
| | - Ruirong Zhang
- MOE Key Laboratory of Micro and Nano Systems for Aerospace Northwestern Polytechnical University Xi'an P. R. China
- Yangtze River Delta Research Institute of NPU Taicang P. R. China
| | - Honglong Chang
- MOE Key Laboratory of Micro and Nano Systems for Aerospace Northwestern Polytechnical University Xi'an P. R. China
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Zhang Z, Huang X, Liu K, Lan T, Wang Z, Zhu Z. Recent Advances in Electrical Impedance Sensing Technology for Single-Cell Analysis. BIOSENSORS 2021; 11:470. [PMID: 34821686 PMCID: PMC8615761 DOI: 10.3390/bios11110470] [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: 10/26/2021] [Revised: 11/15/2021] [Accepted: 11/17/2021] [Indexed: 05/10/2023]
Abstract
Cellular heterogeneity is of significance in cell-based assays for life science, biomedicine and clinical diagnostics. Electrical impedance sensing technology has become a powerful tool, allowing for rapid, non-invasive, and label-free acquisition of electrical parameters of single cells. These electrical parameters, i.e., equivalent cell resistance, membrane capacitance and cytoplasm conductivity, are closely related to cellular biophysical properties and dynamic activities, such as size, morphology, membrane intactness, growth state, and proliferation. This review summarizes basic principles, analytical models and design concepts of single-cell impedance sensing devices, including impedance flow cytometry (IFC) to detect flow-through single cells and electrical impedance spectroscopy (EIS) to monitor immobilized single cells. Then, recent advances of both electrical impedance sensing systems applied in cell recognition, cell counting, viability detection, phenotypic assay, cell screening, and other cell detection are presented. Finally, prospects of impedance sensing technology in single-cell analysis are discussed.
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Affiliation(s)
- Zhao Zhang
- Key Laboratory of MEMS of Ministry of Education, Southeast University, Sipailou 2, Nanjing 210018, China; (Z.Z.); (K.L.); (T.L.)
| | - Xiaowen Huang
- The First Affiliated Hospital of Nanjing Medical University (Jiangsu Province Hospital), Department of Orthopedics, Nanjing 210029, China;
| | - Ke Liu
- Key Laboratory of MEMS of Ministry of Education, Southeast University, Sipailou 2, Nanjing 210018, China; (Z.Z.); (K.L.); (T.L.)
| | - Tiancong Lan
- Key Laboratory of MEMS of Ministry of Education, Southeast University, Sipailou 2, Nanjing 210018, China; (Z.Z.); (K.L.); (T.L.)
| | - Zixin Wang
- School of Electronics and Information Technology, Sun Yat-Sen University, Xingang Xi Road 135, Guangzhou 510275, China;
| | - Zhen Zhu
- Key Laboratory of MEMS of Ministry of Education, Southeast University, Sipailou 2, Nanjing 210018, China; (Z.Z.); (K.L.); (T.L.)
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