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Meyer N, Torrent J, Balme S. Characterizing Prion-Like Protein Aggregation: Emerging Nanopore-Based Approaches. SMALL METHODS 2024:e2400058. [PMID: 38644684 DOI: 10.1002/smtd.202400058] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/12/2024] [Revised: 03/10/2024] [Indexed: 04/23/2024]
Abstract
Prion-like protein aggregation is characteristic of numerous neurodegenerative diseases, such as Alzheimer's and Parkinson's diseases. This process involves the formation of aggregates ranging from small and potentially neurotoxic oligomers to highly structured self-propagating amyloid fibrils. Various approaches are used to study protein aggregation, but they do not always provide continuous information on the polymorphic, transient, and heterogeneous species formed. This review provides an updated state-of-the-art approach to the detection and characterization of a wide range of protein aggregates using nanopore technology. For each type of nanopore, biological, solid-state polymer, and nanopipette, discuss the main achievements for the detection of protein aggregates as well as the significant contributions to the understanding of protein aggregation and diagnostics.
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Affiliation(s)
- Nathan Meyer
- Institut Européen des Membranes, UMR5635 University of Montpellier ENCSM CNRS, Place Eugène Bataillon, Cedex 5, Montpellier, 34095, France
- INM, University of Montpellier, INSERM, Montpellier, 34095, France
| | - Joan Torrent
- INM, University of Montpellier, INSERM, Montpellier, 34095, France
| | - Sébastien Balme
- Institut Européen des Membranes, UMR5635 University of Montpellier ENCSM CNRS, Place Eugène Bataillon, Cedex 5, Montpellier, 34095, France
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Meyer N, Bentin J, Janot JM, Abrao-Nemeir I, Charles-Achille S, Pratlong M, Aquilina A, Trinquet E, Perrier V, Picaud F, Torrent J, Balme S. Ultrasensitive Detection of Aβ42 Seeds in Cerebrospinal Fluid with a Nanopipette-Based Real-Time Fast Amyloid Seeding and Translocation Assay. Anal Chem 2023; 95:12623-12630. [PMID: 37587130 DOI: 10.1021/acs.analchem.3c00017] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/18/2023]
Abstract
In this work, early-stage Aβ42 aggregates were detected using a real-time fast amyloid seeding and translocation (RT-FAST) assay. Specifically, Aβ42 monomers were incubated in buffer solution with and without preformed Aβ42 seeds in a quartz nanopipette coated with L-DOPA. Then, formed Aβ42 aggregates were analyzed on flyby resistive pulse sensing at various incubation time points. Aβ42 aggregates were detected only in the sample with Aβ42 seeds after 180 min of incubation, giving an on/off readout of the presence of preformed seeds. Moreover, this RT-FAST assay could detect preformed seeds spiked in 4% cerebrospinal fluid/buffer solution. However, in this condition, the time to detect the first aggregates was increased. Analysis of Cy3-labeled Aβ42 monomer adsorption on a quartz substrate after L-DOPA coating by confocal fluorescence spectroscopy and molecular dynamics simulation showed the huge influence of Aβ42 adsorption on the aggregation process.
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Affiliation(s)
- Nathan Meyer
- Institut Européen des Membranes, UMR5635 UM ENCSM CNRS, Place Eugène Bataillon, 34095 Montpellier cedex 5, France
- INM UM, CNRS, INSERM, Place Eugène Bataillon, 34095 Montpellier cedex 5, France
| | - Jeremy Bentin
- Laboratoire de Nanomédecine, Imagerie et Thérapeutique, EA4662, Université Bourgogne-Franche-Comté (UFR Sciences et Techniques), Centre Hospitalier Universitaire de Besançon, 16 route de Gray, 25030 Besançon, France
| | - Jean-Marc Janot
- Institut Européen des Membranes, UMR5635 UM ENCSM CNRS, Place Eugène Bataillon, 34095 Montpellier cedex 5, France
| | - Imad Abrao-Nemeir
- Institut Européen des Membranes, UMR5635 UM ENCSM CNRS, Place Eugène Bataillon, 34095 Montpellier cedex 5, France
| | - Saly Charles-Achille
- Institut Européen des Membranes, UMR5635 UM ENCSM CNRS, Place Eugène Bataillon, 34095 Montpellier cedex 5, France
| | - Maud Pratlong
- PerkinElmer, Parc Marcel Boiteux, 30200 Codolet, France
| | | | - Eric Trinquet
- PerkinElmer, Parc Marcel Boiteux, 30200 Codolet, France
| | - Veronique Perrier
- INM UM, CNRS, INSERM, Place Eugène Bataillon, 34095 Montpellier cedex 5, France
| | - Fabien Picaud
- Laboratoire de Nanomédecine, Imagerie et Thérapeutique, EA4662, Université Bourgogne-Franche-Comté (UFR Sciences et Techniques), Centre Hospitalier Universitaire de Besançon, 16 route de Gray, 25030 Besançon, France
| | - Joan Torrent
- INM UM, CNRS, INSERM, Place Eugène Bataillon, 34095 Montpellier cedex 5, France
| | - Sebastien Balme
- Institut Européen des Membranes, UMR5635 UM ENCSM CNRS, Place Eugène Bataillon, 34095 Montpellier cedex 5, France
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Coglitore D, Janot JM, Balme S. Protein at liquid solid interfaces: Toward a new paradigm to change the approach to design hybrid protein/solid-state materials. Adv Colloid Interface Sci 2019; 270:278-292. [PMID: 31306853 DOI: 10.1016/j.cis.2019.07.004] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2019] [Revised: 07/04/2019] [Accepted: 07/05/2019] [Indexed: 10/26/2022]
Abstract
This review gives an overview of protein adsorption at solid/liquid interface. Compared to the other ones, we have focus on three main questions with the point of view of the protein. The first question is related to the kinetic and especially the using of Langmuir model to describe the protein adsorption. The second question is about the concept of hard and soft protein. In this part, we report the protein structural modification induced by adsorption regarding their intrinsic structure. This allows formulating of a new concept to classify the protein to predict their behavior at solid/liquid interface. The last question is related to the protein corona. We give an overview about the soft/hard corona and attempt to make correlation with the concept of hard/soft protein.
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Coglitore D, Giamblanco N, Kizalaité A, Coulon PE, Charlot B, Janot JM, Balme S. Unexpected Hard Protein Behavior of BSA on Gold Nanoparticle Caused by Resveratrol. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:8866-8874. [PMID: 30001624 DOI: 10.1021/acs.langmuir.8b01365] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The understanding of the interactions between nanomaterials, biomolecules, and polyphenols is fundamental in food chemistry, toxicology, and new emerging fields, such as nanomedicine. Here, we investigated the effect of the resveratrol, a principal actor in drug-delivery application on the interaction between bovine serum albumin (BSA), employed as a vector for the delivery of polyphenol drugs, and gold nanoparticle (gNP), the most promising tool in theranostic applications. Through a combination of experimental techniques, which includes an initial evaluation by dynamic light scattering and surface plasmon resonance spectroscopy, we were able to evaluate the evolution of the gold nanoparticle aggregation with increasing ionic strength and the consequences of the BSA and resveratrol addition. To investigate the mechanisms of the interactions, we pursued at the single-molecule level using solid-state nanopore and fluorescence correlation spectroscopy. Our results show that without resveratrol, the BSA is adsorbed on the gNP in water or saline solution. In the presence of resveratrol, the BSA is normally absorbed on gNP in water, but the salt addition leads to its desorption. The resveratrol clearly plays a fundamental role, changing the protein behavior and making the BSA adsorption a reversible process in the presence of salt.
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Affiliation(s)
- Diego Coglitore
- Institut Européen des Membranes, UMR 5635, Université de Montpellier CNRS ENSCM , Place Eugène Bataillon , 34090 Montpellier , France
| | - Nicoletta Giamblanco
- Institut Européen des Membranes, UMR 5635, Université de Montpellier CNRS ENSCM , Place Eugène Bataillon , 34090 Montpellier , France
| | - Agné Kizalaité
- Institut Européen des Membranes, UMR 5635, Université de Montpellier CNRS ENSCM , Place Eugène Bataillon , 34090 Montpellier , France
| | - Pierre Eugene Coulon
- Laboratoire des Solides Irradiés, École Polytechnique , Université Paris-Saclay , Route de Saclay , 91128 Palaiseau Cedex, France
| | - Benoit Charlot
- Institut d'Electronique et des Systèmes , Université de Montpellier , 34095 Montpellier Cedex 5, France
| | - Jean-Marc Janot
- Institut Européen des Membranes, UMR 5635, Université de Montpellier CNRS ENSCM , Place Eugène Bataillon , 34090 Montpellier , France
| | - Sébastien Balme
- Institut Européen des Membranes, UMR 5635, Université de Montpellier CNRS ENSCM , Place Eugène Bataillon , 34090 Montpellier , France
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Frederickx W, Rocha S, Fujita Y, Kennes K, De Keersmaecker H, De Feyter S, Uji-I H, Vanderlinden W. Orthogonal Probing of Single-Molecule Heterogeneity by Correlative Fluorescence and Force Microscopy. ACS NANO 2018; 12:168-177. [PMID: 29257876 DOI: 10.1021/acsnano.7b05405] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Correlative imaging by fluorescence and force microscopy is an emerging technology to acquire orthogonal information at the nanoscale. Whereas atomic force microscopy excels at resolving the envelope structure of nanoscale specimens, fluorescence microscopy can detect specific molecular labels, which enables the unambiguous recognition of molecules in a complex assembly. Whereas correlative imaging at the micrometer scale has been established, it remains challenging to push the technology to the single-molecule level. Here, we used an integrated setup to systematically evaluate the factors that influence the quality of correlative fluorescence and force microscopy. Optimized data processing to ensure accurate drift correction and high localization precision results in image registration accuracies of ∼25 nm on organic fluorophores, which represents a 2-fold improvement over the state of the art in correlative fluorescence and force microscopy. Furthermore, we could extend the Atto532 fluorophore bleaching time ∼2-fold, by chemical modification of the supporting mica surface. In turn, this enables probing the composition of macromolecular complexes by stepwise photobleaching with high confidence. We demonstrate the performance of our method by resolving the stoichiometry of molecular subpopulations in a heterogeneous EcoRV-DNA nucleoprotein ensemble.
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Affiliation(s)
- Wout Frederickx
- Department of Chemistry, Division of Molecular Imaging and Photonics, KU Leuven-University of Leuven , Celestijnenlaan 200F, B-3001, Leuven, Belgium
| | - Susana Rocha
- Department of Chemistry, Division of Molecular Imaging and Photonics, KU Leuven-University of Leuven , Celestijnenlaan 200F, B-3001, Leuven, Belgium
| | - Yasuhiko Fujita
- Department of Chemistry, Division of Molecular Imaging and Photonics, KU Leuven-University of Leuven , Celestijnenlaan 200F, B-3001, Leuven, Belgium
| | - Koen Kennes
- Department of Chemistry, Division of Molecular Imaging and Photonics, KU Leuven-University of Leuven , Celestijnenlaan 200F, B-3001, Leuven, Belgium
| | - Herlinde De Keersmaecker
- Department of Chemistry, Division of Molecular Imaging and Photonics, KU Leuven-University of Leuven , Celestijnenlaan 200F, B-3001, Leuven, Belgium
| | - Steven De Feyter
- Department of Chemistry, Division of Molecular Imaging and Photonics, KU Leuven-University of Leuven , Celestijnenlaan 200F, B-3001, Leuven, Belgium
| | - Hiroshi Uji-I
- Department of Chemistry, Division of Molecular Imaging and Photonics, KU Leuven-University of Leuven , Celestijnenlaan 200F, B-3001, Leuven, Belgium
- Research Institute for Electronic Science, Nanomaterials and Nanoscopy, Hokkaido University , Kita 10 Nishi 20, North Ward, Sapporo 001-0020, Japan
| | - Willem Vanderlinden
- Department of Chemistry, Division of Molecular Imaging and Photonics, KU Leuven-University of Leuven , Celestijnenlaan 200F, B-3001, Leuven, Belgium
- Department of Physics, Nanosystems Initiative Munich, and Center for NanoScience, LMU Munich , Amalienstrasse 54, 80799 Munich, Germany
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Balme S, Coulon PE, Lepoitevin M, Charlot B, Yandrapalli N, Favard C, Muriaux D, Bechelany M, Janot JM. Influence of Adsorption on Proteins and Amyloid Detection by Silicon Nitride Nanopore. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:8916-8925. [PMID: 27506271 DOI: 10.1021/acs.langmuir.6b02048] [Citation(s) in RCA: 49] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
For the past 2 decades, emerging single-nanopore technologies have opened the route to multiple sensing applications. Besides DNA sensing, the identification of proteins and amyloids is a promising field for early diagnosis. However, the influence of the interactions between the nanopore surface and proteins should be taken into account. In this work, we have selected three proteins (avidin, lysozyme, and IgG) that exhibit different affinities with the SiNx surface, and we have also examined lysozyme amyloid. Our results show that the piranha treatment of SiNx significantly decreases protein adsorption. Moreover, we have successfully detected all proteins (pore diameter 17 nm) and shown the possibility of discriminating between denatured lysozyme and its amyloid. For all proteins, the capture rates are lower than expected, and we evidence that they are correlated with the affinity of proteins to the surface. Our result confirms that proteins interacting only with the nanopore surface wall stay long enough to be detected. For lysozyme amyloid, we show that the use of the nanopore is suitable for determining the number of monomer units even if only the proteins interacting with the nanopore are detected.
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Affiliation(s)
- Sébastien Balme
- Institut Européen des Membranes, UMR5635, Université de Montpellier CNRS ENSCM , Place Eugène Bataillon, 34095 Montpellier Cedex 5, France
| | - Pierre Eugène Coulon
- Laboratoire des Solides Irradiés, École polytechnique, Université Paris-Saclay , Route de Saclay, 91128 Palaiseau Cedex, France
| | - Mathilde Lepoitevin
- Institut Européen des Membranes, UMR5635, Université de Montpellier CNRS ENSCM , Place Eugène Bataillon, 34095 Montpellier Cedex 5, France
| | - Benoît Charlot
- Institut d'Electronique et des Systèmes, Université de Montpellier , 34095 Montpellier Cedex 5, France
| | - Naresh Yandrapalli
- Centre d'Études d'Agents Pathogènes et Biotechnologies pour la Santé (CPBS), CNRS UMR5236 , 34293 Montpellier, France
| | - Cyril Favard
- Centre d'Études d'Agents Pathogènes et Biotechnologies pour la Santé (CPBS), CNRS UMR5236 , 34293 Montpellier, France
| | - Delphine Muriaux
- Centre d'Études d'Agents Pathogènes et Biotechnologies pour la Santé (CPBS), CNRS UMR5236 , 34293 Montpellier, France
| | - Mikhael Bechelany
- Institut Européen des Membranes, UMR5635, Université de Montpellier CNRS ENSCM , Place Eugène Bataillon, 34095 Montpellier Cedex 5, France
| | - Jean-Marc Janot
- Institut Européen des Membranes, UMR5635, Université de Montpellier CNRS ENSCM , Place Eugène Bataillon, 34095 Montpellier Cedex 5, France
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Sodzel D, Khranovskyy V, Beni V, Turner APF, Viter R, Eriksson MO, Holtz PO, Janot JM, Bechelany M, Balme S, Smyntyna V, Kolesneva E, Dubovskaya L, Volotovski I, Ubelis A, Yakimova R. Continuous sensing of hydrogen peroxide and glucose via quenching of the UV and visible luminescence of ZnO nanoparticles. Mikrochim Acta 2015. [DOI: 10.1007/s00604-015-1493-9] [Citation(s) in RCA: 71] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Lepoitevin M, Coulon PE, Bechelany M, Cambedouzou J, Janot JM, Balme S. Influence of nanopore surface charge and magnesium ion on polyadenosine translocation. NANOTECHNOLOGY 2015; 26:144001. [PMID: 25785663 DOI: 10.1088/0957-4484/26/14/144001] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
We investigate the influence of a nanopore surface state and the addition of Mg(2+) on poly-adenosine translocation. To do so, two kinds of nanopores with a low aspect ratio (diameter ∼3-5 nm, length 30 nm) were tailored: the first one with a negative charge surface and the second one uncharged. It was shown that the velocity and the energy barrier strongly depend on the nanopore surface. Typically if the nanopore and polyA exhibit a similar charge, the macromolecule velocity increases and its global energy barrier of entrance in the nanopore decreases, as opposed to the non-charged nanopore. Moreover, the addition of a divalent chelating cation induces an increase of energy barrier of entrance, as expected. However, for a negative nanopore, this effect is counterbalanced by the inversion of the surface charge induced by the adsorption of divalent cations.
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Affiliation(s)
- Mathilde Lepoitevin
- Institut Européen des Membranes, UMR5635 CNRS-UM2-ENSCM, Place Eugène Bataillon, 34095 Montpellier cedex 5, France
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Lepoitevin M, Nguyen G, Bechelany M, Balanzat E, Janot JM, Balme S. Combining a sensor and a pH-gated nanopore based on an avidin–biotin system. Chem Commun (Camb) 2015; 51:5994-7. [DOI: 10.1039/c4cc10087e] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Here we propose a new approach to tailor nanopores, which combines both pH gating and sensing properties.
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Affiliation(s)
- Mathilde Lepoitevin
- Institut Européen des Membranes
- UMR5635 ENSM UM2 CNRS
- Place Eugène Bataillon
- 34095 Montpellier cedex 5
- France
| | - Gael Nguyen
- Institut Européen des Membranes
- UMR5635 ENSM UM2 CNRS
- Place Eugène Bataillon
- 34095 Montpellier cedex 5
- France
| | - Mikhael Bechelany
- Institut Européen des Membranes
- UMR5635 ENSM UM2 CNRS
- Place Eugène Bataillon
- 34095 Montpellier cedex 5
- France
| | - Emmanuel Balanzat
- Centre de recherche sur les Ions
- les Matériaux et la Photonique
- UMR6252 CEA-CNRS-ENSICAEN
- 14050 Caen Cedex 4
- France
| | - Jean-Marc Janot
- Institut Européen des Membranes
- UMR5635 ENSM UM2 CNRS
- Place Eugène Bataillon
- 34095 Montpellier cedex 5
- France
| | - Sebastien Balme
- Institut Européen des Membranes
- UMR5635 ENSM UM2 CNRS
- Place Eugène Bataillon
- 34095 Montpellier cedex 5
- France
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Balme S, Thiele D, Kraszewski S, Picaud F, Janot J, Déjardin P. Ionic selectivity of nystatin A1 confined in nanoporous track‐etched polymer membrane. IET Nanobiotechnol 2014; 8:138-42. [DOI: 10.1049/iet-nbt.2013.0014] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Affiliation(s)
- Sébastien Balme
- Institut Européen des MembranesUMR5635 CNRS‐UM2‐ENSCM, Place Eugène Bataillon34095Montpellier cedex 5France
- Institut Charles GerhardtUMR 5253 CNRS‐UM2‐ENSCM‐UM1, Place Eugène Bataillon34095Montpellier cedex 5France
| | - Daniela Thiele
- Institut Européen des MembranesUMR5635 CNRS‐UM2‐ENSCM, Place Eugène Bataillon34095Montpellier cedex 5France
| | - Sebastian Kraszewski
- Laboratoire de NanomédecineImagerie et ThérapeutiqueUniversité de Franche‐ComtéCentre Hospitalier Universitaire de Besançon16 route de Gray25030 Besançon cedexFrance
| | - Fabien Picaud
- Laboratoire de NanomédecineImagerie et ThérapeutiqueUniversité de Franche‐ComtéCentre Hospitalier Universitaire de Besançon16 route de Gray25030 Besançon cedexFrance
| | - Jean‐Marc Janot
- Institut Européen des MembranesUMR5635 CNRS‐UM2‐ENSCM, Place Eugène Bataillon34095Montpellier cedex 5France
| | - Philippe Déjardin
- Institut Européen des MembranesUMR5635 CNRS‐UM2‐ENSCM, Place Eugène Bataillon34095Montpellier cedex 5France
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Balme S, Picaud F, Kraszewski S, Déjardin P, Janot JM, Lepoitevin M, Capomanes J, Ramseyer C, Henn F. Controlling potassium selectivity and proton blocking in a hybrid biological/solid-state polymer nanoporous membrane. NANOSCALE 2013; 5:3961-3968. [PMID: 23535870 DOI: 10.1039/c3nr00564j] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Specific separations of protons and cations are usually performed by electromembrane processes, which require external electric energy. An easier process would be using a membrane able to separate both entities by passive diffusion. Presently, such synthetic nanoporous membranes do not exist. Here, we report the production of a robust hybrid biological/artificial solid-state membrane, which allows selective permeation of alkali metal cations without competing or concurrent permeation of protons. This membrane is simple to prepare and is based on the hydrophobic nature of the polymeric pore walls, and the confined gramicidin A molecules within. This work opens a new route for separation in the domain of nanobiofiltration, especially for tunable nanodevices based on differential ion conduction, with a fundamental understanding of the confinement mechanism.
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Affiliation(s)
- Sébastien Balme
- Institut Européen des Membranes, UMR5635 CNRS-UM2-ENSCM, Place Eugène Bataillon, 34095 Montpellier Cedex 5, France.
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Thin phosphatidylcholine films as background surfaces with further possibilities of functionalization for biomedical applications. Colloids Surf B Biointerfaces 2013; 101:189-95. [DOI: 10.1016/j.colsurfb.2012.06.028] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2012] [Revised: 05/29/2012] [Accepted: 06/05/2012] [Indexed: 11/21/2022]
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Ferez L, Thami T, Akpalo E, Flaud V, Tauk L, Janot JM, Déjardin P. Interface of covalently bonded phospholipids with a phosphorylcholine head: characterization, protein nonadsorption, and further functionalization. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:11536-11544. [PMID: 21848263 DOI: 10.1021/la202793k] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Surface anchored poly(methylhydrosiloxane) (PMHS) thin films on oxidized silicon wafers or glass substrates were functionalized via the SiH hydrosilylation reaction with the internal double bonds of 1,2-dilinoleoyl-sn-glycero-3-phosphorylcholine (18:2 Cis). The surface was characterized by X-ray photoelectron spectroscopy, contact angle measurements, atomic force microscopy, and scanning electron microscopy. These studies showed that the PMHS top layer could be efficiently modified resulting in an interfacial high density of phospholipids. Grafted phospholipids made the initially hydrophobic surface (θ = 106°) very hydrophilic and repellent toward avidin, bovine serum albumin, bovine fibrinogen, lysozyme, and α-chymotrypsin adsorption in phosphate saline buffer pH 7.4. The surface may constitute a new background-stable support with increased biocompatibility. Further possibilities of functionalization on the surface remain available owing to the formation of interfacial SiOH groups by Karstedt-catalyzed side reactions of SiH groups with water. The presence of interfacial SiOH groups was shown by zeta potential measurements. The reactivity and surface density of SiOH groups were checked by fluorescence after reaction of a monoethoxy silane coupling agent bearing Alexa as fluorescent probe.
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Affiliation(s)
- Lynda Ferez
- Institut Européen des Membranes, Université Montpellier 2 (ENSCM, UM2, CNRS), CC047, 2 Place Eugène Bataillon, F-34095 Montpellier Cedex 5, France
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14
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Janot JM, Boissière M, Thami T, Tronel-Peyroz E, Helassa N, Noinville S, Quiquampoix H, Staunton S, Déjardin P. Adsorption of Alexa-Labeled Bt Toxin on Mica, Glass, and Hydrophobized Glass: Study by Normal Scanning Confocal Fluorescence. Biomacromolecules 2010; 11:1661-6. [DOI: 10.1021/bm100313n] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jean-Marc Janot
- Institut Européen des Membranes, Université Montpellier 2, UMR 5635 (ENSCM, CNRS, UM2), CC047, 34095 Montpellier Cedex 5, France, UMR 1222, Ecologie Fonctionnelle et Biogéochimie des Sols, INRA, Montpellier, France, and Laboratoire de Dynamique, Interactions et Réactivité, UMR 7075, CNRS, Thiais, France
| | - Michel Boissière
- Institut Européen des Membranes, Université Montpellier 2, UMR 5635 (ENSCM, CNRS, UM2), CC047, 34095 Montpellier Cedex 5, France, UMR 1222, Ecologie Fonctionnelle et Biogéochimie des Sols, INRA, Montpellier, France, and Laboratoire de Dynamique, Interactions et Réactivité, UMR 7075, CNRS, Thiais, France
| | - Thierry Thami
- Institut Européen des Membranes, Université Montpellier 2, UMR 5635 (ENSCM, CNRS, UM2), CC047, 34095 Montpellier Cedex 5, France, UMR 1222, Ecologie Fonctionnelle et Biogéochimie des Sols, INRA, Montpellier, France, and Laboratoire de Dynamique, Interactions et Réactivité, UMR 7075, CNRS, Thiais, France
| | - Emmanuel Tronel-Peyroz
- Institut Européen des Membranes, Université Montpellier 2, UMR 5635 (ENSCM, CNRS, UM2), CC047, 34095 Montpellier Cedex 5, France, UMR 1222, Ecologie Fonctionnelle et Biogéochimie des Sols, INRA, Montpellier, France, and Laboratoire de Dynamique, Interactions et Réactivité, UMR 7075, CNRS, Thiais, France
| | - Nordine Helassa
- Institut Européen des Membranes, Université Montpellier 2, UMR 5635 (ENSCM, CNRS, UM2), CC047, 34095 Montpellier Cedex 5, France, UMR 1222, Ecologie Fonctionnelle et Biogéochimie des Sols, INRA, Montpellier, France, and Laboratoire de Dynamique, Interactions et Réactivité, UMR 7075, CNRS, Thiais, France
| | - Sylvie Noinville
- Institut Européen des Membranes, Université Montpellier 2, UMR 5635 (ENSCM, CNRS, UM2), CC047, 34095 Montpellier Cedex 5, France, UMR 1222, Ecologie Fonctionnelle et Biogéochimie des Sols, INRA, Montpellier, France, and Laboratoire de Dynamique, Interactions et Réactivité, UMR 7075, CNRS, Thiais, France
| | - Hervé Quiquampoix
- Institut Européen des Membranes, Université Montpellier 2, UMR 5635 (ENSCM, CNRS, UM2), CC047, 34095 Montpellier Cedex 5, France, UMR 1222, Ecologie Fonctionnelle et Biogéochimie des Sols, INRA, Montpellier, France, and Laboratoire de Dynamique, Interactions et Réactivité, UMR 7075, CNRS, Thiais, France
| | - Siobhán Staunton
- Institut Européen des Membranes, Université Montpellier 2, UMR 5635 (ENSCM, CNRS, UM2), CC047, 34095 Montpellier Cedex 5, France, UMR 1222, Ecologie Fonctionnelle et Biogéochimie des Sols, INRA, Montpellier, France, and Laboratoire de Dynamique, Interactions et Réactivité, UMR 7075, CNRS, Thiais, France
| | - Philippe Déjardin
- Institut Européen des Membranes, Université Montpellier 2, UMR 5635 (ENSCM, CNRS, UM2), CC047, 34095 Montpellier Cedex 5, France, UMR 1222, Ecologie Fonctionnelle et Biogéochimie des Sols, INRA, Montpellier, France, and Laboratoire de Dynamique, Interactions et Réactivité, UMR 7075, CNRS, Thiais, France
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Søndergaard AP, Hjortdal J, Breitenbach T, Ivarsen A. Corneal distribution of riboflavin prior to collagen cross-linking. Curr Eye Res 2010; 35:116-21. [PMID: 20136421 DOI: 10.3109/02713680903431847] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
PURPOSE To evaluate the distribution of riboflavin in the corneal stroma, under varying concentrations and application time. MATERIALS AND METHODS In 54 porcine eyes, the central corneal epithelium was removed, and 0.035, 0.1, or 0.2% riboflavin-5-phosphate (in 20% Dextran T-500) was applied for 10, 20, or 30 min (3 x 6 corneas in each of the 3 groups). Trephined corneal buttons were examined using confocal fluorescence microscopy. Stromal riboflavin distribution and concentration was determined by measuring riboflavin fluorescence in optical sections at 10 microm intervals through the entire cornea. The procedure was repeated in 7 human corneal donor grafts using 0.1% riboflavin-5-phosphate for 20 or 30 min. RESULTS In porcine corneas, fluorescence intensity peaked within the first 50 microm followed by a steep decline to baseline. Increasing the riboflavin concentration from 0.1 to 0.2% did not increase stromal depth propagation, although a higher concentration in the anterior 200 microm was observed. Reducing the riboflavin application time from 30 to 20 min had no impact on corneal depth propagation or total riboflavin uptake. However, a 10-min further reduction of the application time caused a significantly reduced riboflavin uptake. In all human corneas, fluorescence peaked within the anterior 50 microm, followed by a steep decline to baseline over the next 200 microm; similar to the observations in porcine corneas. The human corneas imbibed more riboflavin compared to the porcine corneas. CONCLUSIONS In human and porcine corneas, riboflavin does not appear to fully load the corneal stroma using the current clinical procedure. Instead, the uptake appears to be limited to the anterior approximately 200 microm. Changes in application time and riboflavin concentration have only little influence on stromal depth diffusion.
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Aziz M, Jo K, Qaium M, Huh CH, Hong I, Yang H. Platform for Highly Sensitive Alkaline Phosphatase-Based Immunosensors Using 1-Naphthyl Phosphate and an Avidin-Modified Indium Tin Oxide Electrode. ELECTROANAL 2009. [DOI: 10.1002/elan.200904641] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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