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Wen K, Meng X, Wang C, Zhao J, Botros S, Lin Q. Assessing Aptamer-Analyte Binding Kinetics by Microfluidic Fluorescence Microscopy. SENSORS AND ACTUATORS. B, CHEMICAL 2024; 401:135018. [PMID: 38558786 PMCID: PMC10977918 DOI: 10.1016/j.snb.2023.135018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/04/2024]
Abstract
Kinetic measurement plays a crucial role in understanding aptamer binding mechanisms and identifying appropriate aptamers for clinical and research applications. Current techniques, while well established, generally require large sample volumes, bulky and expensive instruments operated by trained personnel, and are hence not readily accessible to resource-limited research laboratories. This paper presents a fluorescence microscopy-based microfluidic assay for measuring aptamer-analyte binding kinetics in a simple and cost-effective manner. Kinetic measurements are achieved by monitoring time-course fluorescence of fluorescently labeled aptamers as they bind to the targets trapped in a microfluidic chip. Fluorescence measurements are performed on a standard fluorescence microscope and are accessible to laboratories with only modest resources. Moreover, microfluidic technology allows efficient and cost-effective immobilization of small amounts of target molecules or live cells as well as flow-based manipulation of aptamers for the measurements. Kinetic measurements of aptamer binding to immunoglobulin E protein and CCRF-CEM cells have yielded results consistent with those obtained from established methods, demonstrating the potential utility of our method for exploring aptamer-target interactions and identifying aptamers that best suit specific given biomedical applications.
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Affiliation(s)
- Kechun Wen
- Department of Mechanical Engineering, Columbia University, New York, NY, 10027, USA
| | - Xin Meng
- Department of Mechanical Engineering, Columbia University, New York, NY, 10027, USA
| | - Chengxi Wang
- Department of Mechanical Engineering, Columbia University, New York, NY, 10027, USA
| | - Jingyang Zhao
- Department of Mechanical Engineering, Columbia University, New York, NY, 10027, USA
| | - Samantha Botros
- Department of Mechanical Engineering, Columbia University, New York, NY, 10027, USA
| | - Qiao Lin
- Department of Mechanical Engineering, Columbia University, New York, NY, 10027, USA
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Sun M, Zhou X, Quan Y, Zhang L, Xie Y. Highly flexible elastomer microfluidic chip for single cell manipulation. BIOMICROFLUIDICS 2022; 16:024104. [PMID: 35310421 PMCID: PMC8923708 DOI: 10.1063/5.0086717] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/28/2022] [Accepted: 03/01/2022] [Indexed: 06/14/2023]
Abstract
New materials and fabrication technologies have significantly boosted the development of lab-on-a-chip technologies and functionalities. In this work, we developed a highly flexible elastomer microfluidic chip with a microchannel with a minimum width of ∼5 μm manufactured by imprinting onto an SU-8 template. We found that the deformation induced in the microstructures by manual stretching of the chip is higher than that for the chip itself, which we attribute to the stress concentration of microstructures. Here, we demonstrate that the elastomer enables the manipulation of single cells, such as dynamic trapping-releasing operations, by simply stretching and releasing the elastomer chip.
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Affiliation(s)
- Miao Sun
- MOE Key Laboratory of Material Physics and Chemistry under Extraordinary Conditions, Northwestern Polytechnical University, Xi’an 710072, China
| | - Xi Zhou
- MOE Key Laboratory of Material Physics and Chemistry under Extraordinary Conditions, Northwestern Polytechnical University, Xi’an 710072, China
| | - Yi Quan
- Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics (CAEP), Mianyang, Sichuan 621000, China
| | - Lianbing Zhang
- School of Life Sciences, Key Laboratory of Space Bioscience & Biotechnology, Northwestern Polytechnical University, Xi'an 710072, China
| | - Yanbo Xie
- MOE Key Laboratory of Material Physics and Chemistry under Extraordinary Conditions, Northwestern Polytechnical University, Xi’an 710072, China
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Abstract
A three-dimensional (3D) tissue model has significant advantages over the conventional two-dimensional (2D) model. A 3D model mimics the relevant in-vivo physiological conditions, allowing a cell culture to serve as an effective tool for drug discovery, tissue engineering, and the investigation of disease pathology. The present reviews highlight the recent advances and the development of microfluidics based methods for the generation of cell spheroids. The paper emphasizes on the application of microfluidic technology for tissue engineering including the formation of multicellular spheroids (MCS). Further, the paper discusses the recent technical advances in the integration of microfluidic devices for MCS-based high-throughput drug screening. The review compares the various microfluidic techniques and finally provides a perspective for the future opportunities in this research area.
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Xue Y, Yang Y, Sun H, Li X, Wu S, Cao A, Duan H. A Switchable and Compressible Carbon Nanotube Sponge Electrocapillary Imbiber. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2015; 27:7241-7246. [PMID: 26462159 DOI: 10.1002/adma.201502837] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/12/2015] [Revised: 08/23/2015] [Indexed: 06/05/2023]
Abstract
Carbon nanotube sponges are lightweight, conductive, highly porous, and flexible. An integration of these properties is suitable for constructing high-performance electrocapillary imbibers. Water imbibition into the sponges can be initiated at low potentials with tunable uptake rates and switched on and off reversibly. These controllable nanoporous imbibers have potential applications in a wide range of flexible micro- and nanofluidic systems.
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Affiliation(s)
- Yahui Xue
- State Key Laboratory for Turbulence and Complex Systems, Department of Mechanics and Engineering Science, College of Engineering, Peking University, Beijing, 100871, P. R .China
| | - Yanbing Yang
- Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing, 100871, P. R. China
| | - Hui Sun
- State Key Laboratory for Turbulence and Complex Systems, Department of Mechanics and Engineering Science, College of Engineering, Peking University, Beijing, 100871, P. R .China
| | - Xiying Li
- State Key Laboratory for Turbulence and Complex Systems, Department of Mechanics and Engineering Science, College of Engineering, Peking University, Beijing, 100871, P. R .China
| | - Shiting Wu
- Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing, 100871, P. R. China
| | - Anyuan Cao
- Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing, 100871, P. R. China
| | - Huiling Duan
- State Key Laboratory for Turbulence and Complex Systems, Department of Mechanics and Engineering Science, College of Engineering, Peking University, Beijing, 100871, P. R .China
- CAPT, HEDPS and IFSA Collaborative Innovation Center of MoE, Peking University, Beijing, 100871, P. R. China
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Alvankarian J, Majlis BY. Tunable Microfluidic Devices for Hydrodynamic Fractionation of Cells and Beads: A Review. SENSORS (BASEL, SWITZERLAND) 2015; 15:29685-701. [PMID: 26610519 PMCID: PMC4701354 DOI: 10.3390/s151129685] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/03/2015] [Revised: 10/26/2015] [Accepted: 11/05/2015] [Indexed: 01/05/2023]
Abstract
The adjustable microfluidic devices that have been developed for hydrodynamic-based fractionation of beads and cells are important for fast performance tunability through interaction of mechanical properties of particles in fluid flow and mechanically flexible microstructures. In this review, the research works reported on fabrication and testing of the tunable elastomeric microfluidic devices for applications such as separation, filtration, isolation, and trapping of single or bulk of microbeads or cells are discussed. Such microfluidic systems for rapid performance alteration are classified in two groups of bulk deformation of microdevices using external mechanical forces, and local deformation of microstructures using flexible membrane by pneumatic pressure. The main advantage of membrane-based tunable systems has been addressed to be the high capability of integration with other microdevice components. The stretchable devices based on bulk deformation of microstructures have in common advantage of simplicity in design and fabrication process.
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Affiliation(s)
- Jafar Alvankarian
- Institute of Microengineering and Nanoelectronics, National University of Malaysia (UKM), 43600 Bangi, Selangor, Malaysia.
| | - Burhanuddin Yeop Majlis
- Institute of Microengineering and Nanoelectronics, National University of Malaysia (UKM), 43600 Bangi, Selangor, Malaysia.
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