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Qin S, Nap RJ, Huang K, Szleifer I. Influence of Membrane Permittivity on Charge Regulation of Weak Polyelectrolytes End-Tethered in Nanopores. Macromolecules 2022. [DOI: 10.1021/acs.macromol.2c01391] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Shiyi Qin
- Department of Biomedical Engineering, Northwestern University, Evanston, Illinois 60208, United States
- Chemistry of Life Processes Institute, Northwestern University, Evanston, Illinois 60208, United States
| | - Rikkert J. Nap
- Department of Biomedical Engineering, Northwestern University, Evanston, Illinois 60208, United States
- Chemistry of Life Processes Institute, Northwestern University, Evanston, Illinois 60208, United States
| | - Kai Huang
- Institute of Systems and Physical Biology, Shenzhen Bay Laboratory, Shenzhen 518107, China
| | - Igal Szleifer
- Department of Biomedical Engineering, Northwestern University, Evanston, Illinois 60208, United States
- Chemistry of Life Processes Institute, Northwestern University, Evanston, Illinois 60208, United States
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
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2
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Förster C, Veith L, Andrieu-Brunsen A. Visible light induced RAFT for asymmetric functionalization of silica mesopores. RSC Adv 2022; 12:27109-27113. [PMID: 36276013 PMCID: PMC9501659 DOI: 10.1039/d2ra05422a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2022] [Accepted: 09/12/2022] [Indexed: 11/21/2022] Open
Abstract
One key feature for bioinspired transport design through nanoscale pores is nanolocal, asymmetric as well as multifunctional nanopore functionalization. Here, we use a visible-light induced, controlled photo electron/energy transfer-reversible addition–fragmentation chain-transfer (PET-RAFT) polymerization for asymmetric polymer placement into mesoporous silica thin films including asymmetric polymer sequence design. We report the asymmetric silica mesopore functionalization and local polymer sequence control of orthogonally charged stimuli-responsive polymers and their influence on ionic transport.![]()
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Affiliation(s)
- Claire Förster
- Macromolecular Chemistry–Smart Membranes, Technische Universität Darmstadt, 64287 Darmstadt, German
| | - Lothar Veith
- Max Planck Institute for Polymer Research, 55128, Mainz, Germany
| | - Annette Andrieu-Brunsen
- Macromolecular Chemistry–Smart Membranes, Technische Universität Darmstadt, 64287 Darmstadt, German
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3
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Stanzel M, Zhao L, Mohammadi R, Pardehkhorram R, Kunz U, Vogel N, Andrieu-Brunsen A. Simultaneous Nanolocal Polymer and In Situ Readout Unit Placement in Mesoporous Separation Layers. Anal Chem 2021; 93:5394-5402. [PMID: 33724794 PMCID: PMC8027984 DOI: 10.1021/acs.analchem.0c04446] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2020] [Accepted: 02/24/2021] [Indexed: 11/28/2022]
Abstract
Bioinspired solid-state nanopores and nanochannels have attracted interest in the last two decades, as they are envisioned to advance future sensing, energy conversion, and separation concepts. Although much effort has been made regarding functionalization of these materials, multifunctionality and accurate positioning of functionalities with nanoscale precision still remain challenging. However, this precision is necessary to meet transport performance and complexity of natural pores in living systems, which are often based on nonequilibrium states and compartmentalization. In this work, a nanolocal functionalization and simultaneous localized sensing strategy inside a filtering mesoporous film using precisely placed plasmonic metal nanoparticles inside mesoporous films with pore accessibility control is demonstrated. A single layer of gold nanoparticles is incorporated into mesoporous thin films with precise spatial control along the nanoscale layer thickness. The local surface plasmon resonance is applied to induce a photopolymerization leading to a nanoscopic polymer shell around the particles and thus nanolocal polymer placement inside the mesoporous material. As near-field modes are sensitive to the dielectric properties of their surrounding, the in situ sensing capability is demonstrated using UV-vis spectroscopy. It is demonstrated that the sensing sensitivity only slightly decreases upon functionalization. The presented nanolocal placement of responsive functional polymers into nanopores offers a simultaneous filtering and nanoscopic readout function. Such a nanoscale local control is envisioned to have a strong impact onto the development of new transport and sensor concepts, especially as the system can be developed into higher complexity using different metal nanoparticles and additional design of mesoporous film filtering properties.
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Affiliation(s)
- Mathias Stanzel
- Ernst-Berl
Institut für Technische und Makromolekulare Chemie, Technische Universität Darmstadt, Alarich-Weiss-Straße 8, 64287 Darmstadt, Germany
| | - Lucy Zhao
- Ernst-Berl
Institut für Technische und Makromolekulare Chemie, Technische Universität Darmstadt, Alarich-Weiss-Straße 8, 64287 Darmstadt, Germany
| | - Reza Mohammadi
- Institute
of Particle Technology, Friedrich-Alexander
University Erlangen-Nürnberg, Cauerstraße 4, 91058 Erlangen, Germany
| | - Raheleh Pardehkhorram
- Ernst-Berl
Institut für Technische und Makromolekulare Chemie, Technische Universität Darmstadt, Alarich-Weiss-Straße 8, 64287 Darmstadt, Germany
| | - Ulrike Kunz
- Department
of Materials and Earth Sciences, Physical Metallurgy Group, Technische Universität Darmstadt, Alarich-Weiss-Straße 2, 64287 Darmstadt, Germany
| | - Nicolas Vogel
- Institute
of Particle Technology, Friedrich-Alexander
University Erlangen-Nürnberg, Cauerstraße 4, 91058 Erlangen, Germany
| | - Annette Andrieu-Brunsen
- Ernst-Berl
Institut für Technische und Makromolekulare Chemie, Technische Universität Darmstadt, Alarich-Weiss-Straße 8, 64287 Darmstadt, Germany
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4
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Reynaud L, Bouchet-Spinelli A, Raillon C, Buhot A. Sensing with Nanopores and Aptamers: A Way Forward. SENSORS 2020; 20:s20164495. [PMID: 32796729 PMCID: PMC7472324 DOI: 10.3390/s20164495] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/30/2020] [Revised: 07/31/2020] [Accepted: 08/03/2020] [Indexed: 12/13/2022]
Abstract
In the 90s, the development of a novel single molecule technique based on nanopore sensing emerged. Preliminary improvements were based on the molecular or biological engineering of protein nanopores along with the use of nanotechnologies developed in the context of microelectronics. Since the last decade, the convergence between those two worlds has allowed for biomimetic approaches. In this respect, the combination of nanopores with aptamers, single-stranded oligonucleotides specifically selected towards molecular or cellular targets from an in vitro method, gained a lot of interest with potential applications for the single molecule detection and recognition in various domains like health, environment or security. The recent developments performed by combining nanopores and aptamers are highlighted in this review and some perspectives are drawn.
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Ochs M, Mohammadi R, Vogel N, Andrieu-Brunsen A. Wetting-Controlled Localized Placement of Surface Functionalities within Nanopores. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2020; 16:e1906463. [PMID: 32182405 DOI: 10.1002/smll.201906463] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/08/2019] [Revised: 02/19/2020] [Accepted: 02/24/2020] [Indexed: 06/10/2023]
Abstract
In the context of sensing and transport control, nanopores play an essential role. Designing multifunctional nanopores and placing multiple surface functionalities with nanoscale precision remains challenging. Interface effects together with a combination of different materials are used to obtain local multifunctionalization of nanoscale pores within a model pore system prepared by colloidal templating. Silica inverse colloidal monolayers are first functionalized with a gold layer to create a hybrid porous architecture with two distinct gold nanostructures on the top surface as well as at the pore bottom. Using orthogonal silane- and thiol-based chemistry together with a control of the wetting state allows individual addressing of the different locations within each pore resulting in nanoscale localized functional placement of three different functional units. Ring-opening metathesis polymerization is used for inner silica-pore wall functionalization. The hydrophobized pores create a Cassie-Baxter wetting state with aqueous solutions of thiols, which enables an exclusive functionalization of the outer gold structures. In a third step, an ethanolic solution able to wet the pores is used to self-assemble a thiol-containing initiator at the pore bottom. Subsequent controlled radical polymerization provides functionalization of the pore bottom. It is demonstrated that the combination of orthogonal surface chemistry and controlled wetting states can be used for the localized functionalization of porous materials.
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Affiliation(s)
- Maria Ochs
- Ernst-Berl-Institut für Technische und Makromolekulare Chemie, Technische Universität Darmstadt, Alarich-Weiss-Str. 12, Darmstadt, 64287, Germany
| | - Reza Mohammadi
- Institute for Particle Technology, Friedrich-Alexander-University Erlangen-Nuremberg, Cauerstrasse 4, Erlangen, 91058, Germany
| | - Nicolas Vogel
- Institute for Particle Technology, Friedrich-Alexander-University Erlangen-Nuremberg, Cauerstrasse 4, Erlangen, 91058, Germany
| | - Annette Andrieu-Brunsen
- Ernst-Berl-Institut für Technische und Makromolekulare Chemie, Technische Universität Darmstadt, Alarich-Weiss-Str. 12, Darmstadt, 64287, Germany
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6
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Polarization Induced Electro-Functionalization of Pore Walls: A Contactless Technology. BIOSENSORS-BASEL 2019; 9:bios9040121. [PMID: 31614545 PMCID: PMC6956341 DOI: 10.3390/bios9040121] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/30/2019] [Revised: 09/19/2019] [Accepted: 09/27/2019] [Indexed: 12/11/2022]
Abstract
This review summarizes recent advances in micro- and nanopore technologies with a focus on the functionalization of pores using a promising method named contactless electro-functionalization (CLEF). CLEF enables the localized grafting of electroactive entities onto the inner wall of a micro- or nano-sized pore in a solid-state silicon/silicon oxide membrane. A voltage or electrical current applied across the pore induces the surface functionalization by electroactive entities exclusively on the inside pore wall, which is a significant improvement over existing methods. CLEF's mechanism is based on the polarization of a sandwich-like silicon/silicon oxide membrane, creating electronic pathways between the core silicon and the electrolyte. Correlation between numerical simulations and experiments have validated this hypothesis. CLEF-induced micro- and nanopores functionalized with antibodies or oligonucleotides were successfully used for the detection and identification of cells and are promising sensitive biosensors. This technology could soon be successfully applied to planar configurations of pores, such as restrictions in microfluidic channels.
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7
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Ismail A, Voci S, Pham P, Leroy L, Maziz A, Descamps L, Kuhn A, Mailley P, Livache T, Buhot A, Leichlé T, Bouchet-Spinelli A, Sojic N. Enhanced Bipolar Electrochemistry at Solid-State Micropores: Demonstration by Wireless Electrochemiluminescence Imaging. Anal Chem 2019; 91:8900-8907. [PMID: 31241899 DOI: 10.1021/acs.analchem.9b00559] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Bipolar electrochemistry (BPE) is a powerful method based on the wireless polarization of a conductive object that induces the asymmetric electroactivity at its two extremities. A key physical limitation of BPE is the size of the conductive object because the shorter the object, the larger is the potential necessary for sufficient polarization. Micrometric and nanometric objects are thus extremely difficult to address by BPE due to the very high potentials required, in the order of tens of kV or more. Herein, the synergetic actions of BPE and of planar micropores integrated in a microfluidic device lead to the spatial confinement of the potential drop at the level of the solid-state micropore, and thus to a locally enhanced polarization of a bipolar electrode. Electrochemiluminescence (ECL) is emitted in half of the electroactive micropore and reveals the asymmetric polarization in this spatial restriction. Micrometric deoxidized silicon electrodes located in the micropore are polarized at a very low potential (7 V), which is more than 2 orders of magnitude lower compared to the classic bipolar configurations. This behavior is intrinsically associated with the unique properties of the micropores, where the sharp potential drop is focused. The presented approach offers exciting perspectives for BPE of micro/nano-objects, such as dynamic BPE with objects passing through the pores or wireless ECL-emitting micropores.
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Affiliation(s)
- Abdulghani Ismail
- Univ. Grenoble Alpes, CEA, CNRS, INAC-SyMMES , 38000 Grenoble , France
| | - Silvia Voci
- Univ. Bordeaux, CNRS, Bordeaux INP, ISM,UMR 5255 , F-33400 , Talence , France
| | | | - Loïc Leroy
- Univ. Grenoble Alpes, CEA, CNRS, INAC-SyMMES , 38000 Grenoble , France
| | - Ali Maziz
- LAAS-CNRS, Université de Toulouse , 31400 Toulouse , France
| | - Lucie Descamps
- Univ. Grenoble Alpes, CEA, CNRS, INAC-SyMMES , 38000 Grenoble , France
| | - Alexander Kuhn
- Univ. Bordeaux, CNRS, Bordeaux INP, ISM,UMR 5255 , F-33400 , Talence , France
| | | | - Thierry Livache
- Univ. Grenoble Alpes, CEA, CNRS, INAC-SyMMES , 38000 Grenoble , France
| | - Arnaud Buhot
- Univ. Grenoble Alpes, CEA, CNRS, INAC-SyMMES , 38000 Grenoble , France
| | | | | | - Neso Sojic
- Univ. Bordeaux, CNRS, Bordeaux INP, ISM,UMR 5255 , F-33400 , Talence , France
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Long Z, Zhan S, Gao P, Wang Y, Lou X, Xia F. Recent Advances in Solid Nanopore/Channel Analysis. Anal Chem 2017; 90:577-588. [DOI: 10.1021/acs.analchem.7b04737] [Citation(s) in RCA: 97] [Impact Index Per Article: 13.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- Zi Long
- Faculty
of Materials Science and Chemistry, China University of Geosciences, Wuhan, Hubei 430074, P. R. China
| | - Shenshan Zhan
- School
of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan, Hubei 430074, P. R. China
| | - Pengcheng Gao
- Faculty
of Materials Science and Chemistry, China University of Geosciences, Wuhan, Hubei 430074, P. R. China
| | - Yongqian Wang
- Faculty
of Materials Science and Chemistry, China University of Geosciences, Wuhan, Hubei 430074, P. R. China
| | - Xiaoding Lou
- Faculty
of Materials Science and Chemistry, China University of Geosciences, Wuhan, Hubei 430074, P. R. China
- School
of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan, Hubei 430074, P. R. China
| | - Fan Xia
- Faculty
of Materials Science and Chemistry, China University of Geosciences, Wuhan, Hubei 430074, P. R. China
- School
of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan, Hubei 430074, P. R. China
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9
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Menais T, Mossa S, Buhot A. Polymer translocation through nano-pores in vibrating thin membranes. Sci Rep 2016; 6:38558. [PMID: 27934936 PMCID: PMC5146916 DOI: 10.1038/srep38558] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2016] [Accepted: 11/10/2016] [Indexed: 01/31/2023] Open
Abstract
Polymer translocation is a promising strategy for the next-generation DNA sequencing technologies. The use of biological and synthetic nano-pores, however, still suffers from serious drawbacks. In particular, the width of the membrane layer can accommodate several bases at the same time, making difficult accurate sequencing applications. More recently, the use of graphene membranes has paved the way to new sequencing capabilities, with the possibility to measure transverse currents, among other advances. The reduced thickness of these new membranes poses new questions on the effect of deformability and vibrations of the membrane on the translocation process, two features which are not taken into account in the well established theoretical frameworks. Here, we make a first step forward in this direction. We report numerical simulation work on a model system simple enough to allow gathering significant insight on the effect of these features on the average translocation time, with appropriate statistical significance. We have found that the interplay between thermal fluctuations and the deformability properties of the nano-pore play a crucial role in determining the process. We conclude by discussing new directions for further work.
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Affiliation(s)
- Timothée Menais
- Univ. Grenoble Alpes, INAC-SYMMES, F-38000 Grenoble, France
- CNRS, INAC-SYMMES, F-38000 Grenoble, France
- CEA, INAC-SYMMES, F-38000 Grenoble, France
| | - Stefano Mossa
- Univ. Grenoble Alpes, INAC-SYMMES, F-38000 Grenoble, France
- CNRS, INAC-SYMMES, F-38000 Grenoble, France
- CEA, INAC-SYMMES, F-38000 Grenoble, France
| | - Arnaud Buhot
- Univ. Grenoble Alpes, INAC-SYMMES, F-38000 Grenoble, France
- CNRS, INAC-SYMMES, F-38000 Grenoble, France
- CEA, INAC-SYMMES, F-38000 Grenoble, France
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10
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Ali MA, Mondal K, Singh C, Malhotra BD, Sharma A. Anti-epidermal growth factor receptor conjugated mesoporous zinc oxide nanofibers for breast cancer diagnostics. NANOSCALE 2015; 7:7234-45. [PMID: 25811908 DOI: 10.1039/c5nr00194c] [Citation(s) in RCA: 70] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
We report the fabrication of an efficient, label-free, selective and highly reproducible immunosensor with unprecedented sensitivity (femto-molar) to detect a breast cancer biomarker for early diagnostics. Mesoporous zinc oxide nanofibers (ZnOnFs) are synthesized by electrospinning technique with a fiber diameter in the range of 50-150 nm. Fragments of ZnOnFs are electrophoretically deposited on an indium tin oxide glass substrate and conjugated via covalent or electrostatic interactions with a biomarker (anti-ErbB2; epidermal growth factor receptor 2). Oxygen plasma treatment of the carbon doped ZnOnFs generates functional groups (-COOH, -OH, etc.) that are effective for the conjugation of anti-ErbB2. ZnOnFs without plasma treatment that conjugate via electrostatic interactions were also tested for comparison. Label-free detection of the breast cancer biomarker by this point-of-care device is achieved by an electrochemical impedance technique that has high sensitivity (7.76 kΩ μM(-1)) and can detect 1 fM (4.34 × 10(-5) ng mL(-1)) concentration. The excellent impedimetric response of this immunosensor provides a fast detection (128 s) in a wide detection test range (1.0 fM-0.5 μM). The oxy-plasma treated ZnOnF immunoelectrode shows a higher association constant (404.8 kM(-1) s(-1)) indicating a higher affinity towards the ErbB2 antigen compared to the untreated ZnOnF immunoelectrode (165.6 kM(-1) s(-1)). This sensor is about an order of magnitude more sensitive than the best demonstrated in the literature based on different nanomaterials and about three orders of magnitude better than the ELISA standard for breast cancer biomarker detection. This proposed point-of-care cancer diagnostic offers several advantages, such as higher stability, rapid monitoring, simplicity, cost-effectiveness, etc., and should prove to be useful for the detection of other bio- and cancer markers.
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Affiliation(s)
- Md Azahar Ali
- Department of Chemical Engineering, Indian Institute of Technology, Kanpur, India.
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Liu L, Li C, Ma J, Wu Y, Ni Z, Chen Y. Theoretical and experimental studies on ionic currents in nanopore-based biosensors. IET Nanobiotechnol 2014; 8:247-56. [PMID: 25429504 DOI: 10.1049/iet-nbt.2013.0017] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
Novel generation of analytical technology based on nanopores has provided possibilities to fabricate nanofluidic devices for low-cost DNA sequencing or rapid biosensing. In this paper, a simplified model was suggested to describe DNA molecule's translocation through a nanopore, and the internal potential, ion concentration, ionic flowing speed and ionic current in nanopores with different sizes were theoretically calculated and discussed on the basis of Poisson-Boltzmann equation, Navier-Stokes equation and Nernst-Planck equation by considering several important parameters, such as the applied voltage, the thickness and the electric potential distributions in nanopores. In this way, the basic ionic currents, the modulated ionic currents and the current drops induced by translocation were obtained, and the size effects of the nanopores were carefully compared and discussed based on the calculated results and experimental data, which indicated that nanopores with a size of 10 nm or so are more advantageous to achieve high quality ionic current signals in DNA sensing.
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Affiliation(s)
- Lei Liu
- Suzhou Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments, Suzhou Research Institute of Southeast University, Suzhou 215123, People's Republic of China.
| | - Chu Li
- Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments, School of Mechanical Engineering, Southeast University, Nanjing, Jiangsu 211189, People's Republic of China
| | - Jian Ma
- Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments, School of Mechanical Engineering, Southeast University, Nanjing, Jiangsu 211189, People's Republic of China
| | - Yingdong Wu
- Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments, School of Mechanical Engineering, Southeast University, Nanjing, Jiangsu 211189, People's Republic of China
| | - Zhonghua Ni
- Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments, School of Mechanical Engineering, Southeast University, Nanjing, Jiangsu 211189, People's Republic of China
| | - Yunfei Chen
- Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments, School of Mechanical Engineering, Southeast University, Nanjing, Jiangsu 211189, People's Republic of China
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12
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Liu L, Wang B, Sha J, Yang Y, Hou Y, Ni Z, Chen Y. Voltage-driven translocation behaviors of IgG molecule through nanopore arrays. NANOSCALE RESEARCH LETTERS 2013; 8:229. [PMID: 23676116 PMCID: PMC3664219 DOI: 10.1186/1556-276x-8-229] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/17/2012] [Accepted: 01/12/2013] [Indexed: 06/01/2023]
Abstract
Nanopore-based biosensing has attracted more and more interests in the past years, which is also regarded as an emerging field with major impact on bio-analysis and fundamental understanding of nanoscale interactions down to single-molecule level. In this work, the voltage-driven translocation properties of goat antibody to human immunoglobulin G (IgG) are investigated using nanopore arrays in polycarbonate membranes. Obviously, the background ionic currents are modulated by IgG molecules for their physical place-holding effect. However, the detected ionic currents do 'not' continuously decrease as conceived; the currents first decrease, then increase, and finally stabilize with increasing IgG concentration. To understand this phenomenon, a simplified model is suggested, and the calculated results contribute to the understanding of the abnormal phenomenon in the actual ionic current changing tendency.
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Affiliation(s)
- Lei Liu
- Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments, School of Mechanics, Southeast University, Nanjing 210096, People's Republic of China
| | - Bing Wang
- Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments, School of Mechanics, Southeast University, Nanjing 210096, People's Republic of China
| | - Jingjie Sha
- Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments, School of Mechanics, Southeast University, Nanjing 210096, People's Republic of China
| | - Yue Yang
- Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments, School of Mechanics, Southeast University, Nanjing 210096, People's Republic of China
| | - Yaozong Hou
- Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments, School of Mechanics, Southeast University, Nanjing 210096, People's Republic of China
| | - Zhonghua Ni
- Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments, School of Mechanics, Southeast University, Nanjing 210096, People's Republic of China
| | - Yunfei Chen
- Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments, School of Mechanics, Southeast University, Nanjing 210096, People's Republic of China
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13
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Liu J, Bombera R, Leroy L, Roupioz Y, Baganizi DR, Marche PN, Haguet V, Mailley P, Livache T. Selective individual primary cell capture using locally bio-functionalized micropores. PLoS One 2013; 8:e57717. [PMID: 23469221 PMCID: PMC3585871 DOI: 10.1371/journal.pone.0057717] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2012] [Accepted: 01/24/2013] [Indexed: 12/12/2022] Open
Abstract
Background Solid-state micropores have been widely employed for 6 decades to recognize and size flowing unlabeled cells. However, the resistive-pulse technique presents limitations when the cells to be differentiated have overlapping dimension ranges such as B and T lymphocytes. An alternative approach would be to specifically capture cells by solid-state micropores. Here, the inner wall of 15-µm pores made in 10 µm-thick silicon membranes was covered with antibodies specific to cell surface proteins of B or T lymphocytes. The selective trapping of individual unlabeled cells in a bio-functionalized micropore makes them recognizable just using optical microscopy. Methodology/Principal Findings We locally deposited oligodeoxynucleotide (ODN) and ODN-conjugated antibody probes on the inner wall of the micropores by forming thin films of polypyrrole-ODN copolymers using contactless electro-functionalization. The trapping capabilities of the bio-functionalized micropores were validated using optical microscopy and the resistive-pulse technique by selectively capturing polystyrene microbeads coated with complementary ODN. B or T lymphocytes from a mouse splenocyte suspension were specifically immobilized on micropore walls functionalized with complementary ODN-conjugated antibodies targeting cell surface proteins. Conclusions/Significance The results showed that locally bio-functionalized micropores can isolate target cells from a suspension during their translocation throughout the pore, including among cells of similar dimensions in complex mixtures.
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Affiliation(s)
- Jie Liu
- Institut Nanosciences et Cryogénie, UMR5819 CEA/CNRS/UJF, Grenoble, France
| | - Radoslaw Bombera
- Institut Nanosciences et Cryogénie, UMR5819 CEA/CNRS/UJF, Grenoble, France
| | - Loïc Leroy
- Institut Nanosciences et Cryogénie, UMR5819 CEA/CNRS/UJF, Grenoble, France
| | - Yoann Roupioz
- Institut Nanosciences et Cryogénie, UMR5819 CEA/CNRS/UJF, Grenoble, France
| | - Dieudonné R. Baganizi
- Institut Nanosciences et Cryogénie, UMR5819 CEA/CNRS/UJF, Grenoble, France
- Institut Albert Bonniot, U823 INSERM/UJF, La Tronche, France
| | | | - Vincent Haguet
- Institut de Recherches en Technologies et Sciences pour le Vivant, U1038 CEA/Inserm/UJF, Grenoble, France
| | - Pascal Mailley
- Institut Nanosciences et Cryogénie, UMR5819 CEA/CNRS/UJF, Grenoble, France
| | - Thierry Livache
- Institut Nanosciences et Cryogénie, UMR5819 CEA/CNRS/UJF, Grenoble, France
- * E-mail:
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