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Walker O, Rébiscoul D, Odorico M, Tardif S, Pellet-Rostaing S, Arrachart G. Toward a method of understanding the complexation of Rare Earth Element by functionalized organosilanes in aqueous media. Colloids Surf A Physicochem Eng Asp 2023. [DOI: 10.1016/j.colsurfa.2023.131049] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
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2
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Sharafeldin M, Davis JJ. Characterising the biosensing interface. Anal Chim Acta 2022; 1216:339759. [DOI: 10.1016/j.aca.2022.339759] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2021] [Revised: 02/08/2022] [Accepted: 03/22/2022] [Indexed: 12/19/2022]
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3
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Graphene Oxide Synthesis, Properties and Characterization Techniques: A Comprehensive Review. CHEMENGINEERING 2021. [DOI: 10.3390/chemengineering5030064] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
The unique properties of graphene oxide (GO) have attracted the attention of the research community and cost-effective routes for its production are studied. The type and percentage of the oxygen groups that decorate a GO sheet are dependent on the synthesis path, and this path specifies the carbon content of the sheet. The chemical reduction of GO results in reduced graphene oxide (rGO) while the removal of the oxygen groups is also achievable with thermal processes (tpGO). This review article introduces the reader to the carbon allotropes, provides information about graphene which is the backbone of GO and focuses on GO synthesis and properties. The last part covers some characterization techniques of GO (XRD, FTIR, AFM, SEM-EDS, N2 porosimetry and UV-Vis) with a view to the fundamental principles of each technique. Some critical aspects arise for GO synthesized and characterized from our group.
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4
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A structure-supporting, self-healing, and high permeating hydrogel bioink for establishment of diverse homogeneous tissue-like constructs. Bioact Mater 2021; 6:3580-3595. [PMID: 33869899 PMCID: PMC8024533 DOI: 10.1016/j.bioactmat.2021.03.019] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2020] [Revised: 03/06/2021] [Accepted: 03/06/2021] [Indexed: 12/17/2022] Open
Abstract
The ready-to-use, structure-supporting hydrogel bioink can shorten the time for ink preparation, ensure cell dispersion, and maintain the preset shape/microstructure without additional assistance during printing. Meanwhile, ink with high permeability might facilitate uniform cell growth in biological constructs, which is beneficial to homogeneous tissue repair. Unfortunately, current bioinks are hard to meet these requirements simultaneously in a simple way. Here, based on the fast dynamic crosslinking of aldehyde hyaluronic acid (AHA)/N-carboxymethyl chitosan (CMC) and the slow stable crosslinking of gelatin (GEL)/4-arm poly(ethylene glycol) succinimidyl glutarate (PEG-SG), we present a time-sharing structure-supporting (TSHSP) hydrogel bioink with high permeability, containing 1% AHA, 0.75% CMC, 1% GEL and 0.5% PEG-SG. The TSHSP hydrogel can facilitate printing with proper viscoelastic property and self-healing behavior. By crosslinking with 4% PEG-SG for only 3 min, the integrity of the cell-laden construct can last for 21 days due to the stable internal and external GEL/PEG-SG networks, and cells manifested long-term viability and spreading morphology. Nerve-like, muscle-like, and cartilage-like in vitro constructs exhibited homogeneous cell growth and remarkable biological specificities. This work provides not only a convenient and practical bioink for tissue engineering, targeted cell therapy, but also a new direction for hydrogel bioink development. A time-sharing structure-supporting (TSHSP) bioink based on gelation time difference between two gelling systems. The high permeability of TSHSP hydrogel is the basis for effective matter exchange. The TSHSP hydrogel facilitates room temperature printing with proper viscoelastic property and self-healing behavior. Cells manifest long-term viability and spreading morphology in bioprinted TSHSP constructs. In vitro tissue-like TSHSP constructs exhibit homogeneous cell growth and remarkable biological specificities.
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5
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Blond P, Bevernaegie R, Troian-Gautier L, Lagrost C, Hubert J, Reniers F, Raussens V, Jabin I. Ready-to-Use Germanium Surfaces for the Development of FTIR-Based Biosensors for Proteins. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:12068-12076. [PMID: 33007158 DOI: 10.1021/acs.langmuir.0c02681] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Germanium is particularly suitable for the design of FTIR-based biosensors for proteins. The grafting of stable and thin organic layers on germanium surfaces remains, however, challenging. To tackle this problem, we developed a calix[4]arene-tetradiazonium salt decorated with four oligo(ethylene glycol) chains and a terminal reactive carboxyl group. This versatile molecular platform was covalently grafted on germanium surfaces to yield robust ready-to-use surfaces for biosensing applications. The grafted calixarene monolayer prevents nonspecific adsorption of proteins while allowing bioconjugation with biomolecules such as bovine serum albumin (BSA) or biotin. It is shown that the native form of the investigated proteins was maintained upon immobilization. As a proof of concept, the resulting calix[4]arene-based germanium biosensors were used through a combination of ATR-FTIR spectroscopy and fluorescence microscopy for the selective detection of streptavidin from a complex medium. This study opens real possibilities for the development of sensitive and selective FTIR-based biosensors devoted to the detection of proteins.
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Affiliation(s)
- Pascale Blond
- Laboratoire de Chimie Organique, Université libre de Bruxelles (ULB), Avenue F. D. Roosevelt 50, CP160/06, B-1050 Brussels, Belgium
- Laboratory for the Structure and Function of Biological Membranes, Centre for Structural Biology and Bioinformatics, Université libre de Bruxelles (ULB), Boulevard du Triomphe, CP206/02, B-1050 Brussels, Belgium
| | - Robin Bevernaegie
- Laboratoire de Chimie Organique, Université libre de Bruxelles (ULB), Avenue F. D. Roosevelt 50, CP160/06, B-1050 Brussels, Belgium
| | - Ludovic Troian-Gautier
- Laboratoire de Chimie Organique, Université libre de Bruxelles (ULB), Avenue F. D. Roosevelt 50, CP160/06, B-1050 Brussels, Belgium
| | | | - Julie Hubert
- Chemistry of Surfaces, Interfaces and Nanomaterials, Université libre de Bruxelles (ULB), Boulevard du Triomphe, CP 255, B-1050 Brussels, Belgium
| | - François Reniers
- Chemistry of Surfaces, Interfaces and Nanomaterials, Université libre de Bruxelles (ULB), Boulevard du Triomphe, CP 255, B-1050 Brussels, Belgium
| | - Vincent Raussens
- Laboratory for the Structure and Function of Biological Membranes, Centre for Structural Biology and Bioinformatics, Université libre de Bruxelles (ULB), Boulevard du Triomphe, CP206/02, B-1050 Brussels, Belgium
| | - Ivan Jabin
- Laboratoire de Chimie Organique, Université libre de Bruxelles (ULB), Avenue F. D. Roosevelt 50, CP160/06, B-1050 Brussels, Belgium
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6
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Blond P, Mattiuzzi A, Valkenier H, Troian-Gautier L, Bergamini JF, Doneux T, Goormaghtigh E, Raussens V, Jabin I. Grafting of Oligo(ethylene glycol)-Functionalized Calix[4]arene-Tetradiazonium Salts for Antifouling Germanium and Gold Surfaces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:6021-6027. [PMID: 29724105 DOI: 10.1021/acs.langmuir.8b00464] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
Biosensors that can determine protein concentration and structure are highly desired for biomedical applications. For the development of such biosensors, the use of Fourier transform infrared (FTIR) spectroscopy with the attenuated internal total reflection (ATR) configuration is particularly attractive, but it requires appropriate surface functionalization of the ATR optical element. Indeed, the surface has to specifically interact with a target protein in close contact with the optical element and must display antifouling properties to prevent nonspecific adsorption of other proteins. Here, we report robust monolayers of calix[4]arenes bearing oligo(ethylene glycol) (oEG) chains, which were grafted on germanium and gold surfaces via their tetradiazonium salts. The formation of monolayers of oEGylated calix[4]arenes was confirmed by AFM, IR, and contact angle measurements. The antifouling properties of these modified surfaces were studied by ATR-FTIR spectroscopy and fluorescence microscopy, and the nonspecific absorption of bovine serum albumin was found to be reduced by 85% compared to that of unmodified germanium. In other words, the organic coating by oEGylated calix[4]arenes provides remarkable antifouling properties, opening the way for the design of germanium- or gold-based biosensors.
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Affiliation(s)
- Pascale Blond
- Laboratoire de Chimie Organique , Université Libre de Bruxelles (ULB) , avenue F. D. Roosevelt 50 , CP160/06, B-1050 Brussels , Belgium
- Laboratory for the Structure and Function of Biological Membranes, Center for Structural Biology and Bioinformatics , Université Libre de Bruxelles (ULB) , avenue F. D. Roosevelt 50 , CP206/02, B-1050 Brussels , Belgium
| | - Alice Mattiuzzi
- Laboratoire de Chimie Organique , Université Libre de Bruxelles (ULB) , avenue F. D. Roosevelt 50 , CP160/06, B-1050 Brussels , Belgium
- X4C , Rue Chêne Bonnet 128 , 6110 Montigny-le-Tilleul , Belgium
| | - Hennie Valkenier
- Engineering of Molecular NanoSystems , Ecole Polytechnique de Bruxelles, Université Libre de Bruxelles (ULB) , avenue F. D. Roosevelt 50 , CP165/64, B-1050 Brussels , Belgium
| | - Ludovic Troian-Gautier
- Laboratoire de Chimie Organique , Université Libre de Bruxelles (ULB) , avenue F. D. Roosevelt 50 , CP160/06, B-1050 Brussels , Belgium
| | - Jean-François Bergamini
- Institut des Sciences Chimiques de Rennes (Equipe MaCSE), CNRS, UMR 6226 , Université de Rennes 1 , Campus de Beaulieu, Bat 10C, 35042 Cedex Rennes , France
| | - Thomas Doneux
- Chimie Analytique et Chimie des Interfaces , Université Libre de Bruxelles (ULB) , Campus de la Plaine, boulevard du Triomphe , CP255, B-1050 Brussels , Belgium
| | - Erik Goormaghtigh
- Laboratory for the Structure and Function of Biological Membranes, Center for Structural Biology and Bioinformatics , Université Libre de Bruxelles (ULB) , avenue F. D. Roosevelt 50 , CP206/02, B-1050 Brussels , Belgium
| | - Vincent Raussens
- Laboratory for the Structure and Function of Biological Membranes, Center for Structural Biology and Bioinformatics , Université Libre de Bruxelles (ULB) , avenue F. D. Roosevelt 50 , CP206/02, B-1050 Brussels , Belgium
| | - Ivan Jabin
- Laboratoire de Chimie Organique , Université Libre de Bruxelles (ULB) , avenue F. D. Roosevelt 50 , CP160/06, B-1050 Brussels , Belgium
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7
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Schartner J, Güldenhaupt J, Katharina Gaßmeyer S, Rosga K, Kourist R, Gerwert K, Kötting C. Highly stable protein immobilizationviamaleimido-thiol chemistry to monitor enzymatic activity. Analyst 2018; 143:2276-2284. [DOI: 10.1039/c8an00301g] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Combining a novel protein immobilisation method with multivariate curve resolution enables the direct observation of biocatalysis by ATR-FTIR spectroscopy.
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Affiliation(s)
- Jonas Schartner
- Department of Biophysics
- Ruhr-Universität Bochum
- 44801 Bochum
- Germany
| | - Jörn Güldenhaupt
- Department of Biophysics
- Ruhr-Universität Bochum
- 44801 Bochum
- Germany
| | | | - Katharina Rosga
- Department of Biophysics
- Ruhr-Universität Bochum
- 44801 Bochum
- Germany
| | - Robert Kourist
- Junior Research Group for Microbial Biotechnology
- Ruhr-Universität Bochum
- 44801 Bochum
- Germany
| | - Klaus Gerwert
- Department of Biophysics
- Ruhr-Universität Bochum
- 44801 Bochum
- Germany
| | - Carsten Kötting
- Department of Biophysics
- Ruhr-Universität Bochum
- 44801 Bochum
- Germany
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8
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Designing a high performance, stable spectroscopic biosensor for the binding of large and small molecules. J Colloid Interface Sci 2017; 508:443-454. [DOI: 10.1016/j.jcis.2017.08.057] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2017] [Revised: 08/16/2017] [Accepted: 08/17/2017] [Indexed: 11/18/2022]
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9
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Valkenier H, Malytskyi V, Blond P, Retout M, Mattiuzzi A, Goole J, Raussens V, Jabin I, Bruylants G. Controlled Functionalization of Gold Nanoparticles with Mixtures of Calix[4]arenes Revealed by Infrared Spectroscopy. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:8253-8259. [PMID: 28727432 DOI: 10.1021/acs.langmuir.7b02140] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
Labile ligands such as thiols and carboxylates are commonly used to functionalize AuNPs, though little control over the composition is possible when mixtures of ligands are used. It was shown recently that robustly functionalized AuNPs can be obtained through the reductive grafting of calix[4]arenes bearing diazonium groups on the large rim. Here, we report a calix[4]arene-tetradiazonium decorated by four oligo(ethylene glycol) chains on the small rim, which upon grafting gave AuNPs with excellent stability thanks to the C-Au bonds. Mixtures of this calixarene and one with four carboxylate groups were grafted on AuNPs. The resulting particles were analyzed by infrared spectroscopy, which revealed that the composition of the ligand shell clearly reflected the ratio of calixarenes that was present in solution. This strategy opens the way to robustly protected AuNPs with well-defined numbers of functional or postfunctionalizable groups.
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Affiliation(s)
| | | | | | | | - Alice Mattiuzzi
- X4C, Rue Chêne Bonnet 128, 6110 Montigny-le-Tilleul, Belgium
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10
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Macharia DK, Tian Q, Chen L, Sun Y, Yu N, He C, Wang H, Chen Z. PEGylated (NH 4) xWO 3 nanorods as efficient and stable multifunctional nanoagents for simultaneous CT imaging and photothermal therapy of tumor. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 2017; 174:10-17. [PMID: 28750318 DOI: 10.1016/j.jphotobiol.2017.07.006] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/20/2016] [Revised: 07/05/2017] [Accepted: 07/07/2017] [Indexed: 11/26/2022]
Abstract
The simultaneous imaging and photothermal therapy of tumors have attracted much attention, and a prerequisite is to obtain multifunctional nanomaterials. Ideally, one kind of nanoparticles with single component can be used as both imaging agent and photothermal agent. Herein, we have developed the PEGylated (NH4)xWO3 (denoted as (NH4)xWO3-PEG) nanorods as multifunctional nanoparticles with single semiconductor component. (NH4)xWO3-PEG nanorods with about 30nm diameter and length of several hundred nanometers have been obtained through a solvothermal synthesis-PEGylation two-step route. Under the irradiation of 980-nm laser with intensity of 0.72Wcm-2, aqueous dispersion of (NH4)xWO3-PEG nanorods (0.67-5.44mmol/L) displays high elevation (17.6-34.5°C) of temperature in 400s, accompanied by an excellent long-term photothermal stability. Furthermore, (NH4)xWO3-PEG nanorods exhibit as high as 6 times X-ray attenuation ability compared to that of the clinically used iodine-based X-ray computed tomography (CT) contrast agent (Iopromide). More importantly, after PBS solution of (NH4)xWO3-PEG nanorods is injected into the tumor of mice, the tumor can be effectively detected by CT imaging. Moreover, cancer cells in vivo can be further destroyed by the photothermal effects of (NH4)xWO3-PEG nanorods, under the irradiation of 980-nm laser with the safe intensity of 0.72Wcm-2 for 10min. Therefore, (NH4)xWO3-PEG nanorods can be used as a new kind of stable and efficient multifunctional nanoagent with single component for simultaneous CT imaging and photothermal therapy of tumor.
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Affiliation(s)
- Daniel K Macharia
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, China
| | - Qiyun Tian
- Department of Radiology and Experimental Research Center, Shanghai General Hospital, School of Medicine, Shanghai Jiaotong University, Shanghai 200080, China
| | - Liang Chen
- College of Chemistry, Chemical Engineering and Biotechnology, Donghua University, Shanghai, China
| | - Yingqi Sun
- Department of Radiology and Experimental Research Center, Shanghai General Hospital, School of Medicine, Shanghai Jiaotong University, Shanghai 200080, China
| | - Nuo Yu
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, China
| | - Chuanglong He
- College of Chemistry, Chemical Engineering and Biotechnology, Donghua University, Shanghai, China
| | - Han Wang
- Department of Radiology and Experimental Research Center, Shanghai General Hospital, School of Medicine, Shanghai Jiaotong University, Shanghai 200080, China.
| | - Zhigang Chen
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, China.
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11
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Wassel E, Es-Souni M, Berger N, Schopf D, Dietze M, Solterbeck CH, Es-Souni M. Nanocomposite Films of Laponite/PEG-Grafted Polymers and Polymer Brushes with Nonfouling Properties. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:6739-6750. [PMID: 28605897 DOI: 10.1021/acs.langmuir.7b00534] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
We explore the suitability of nanocomposite thin films based on laponite nanomaterial and grafted antiadhesive polymers as transparent nonfouling surfaces. For this purpose, two polymers were chosen: a linear poly(ethylene glycol) (PEG) silane, 2-[methoxy(polyethyleneoxy)propyl]-trimethoxysilane), and thermoresponsive poly(oligo ethylene glycol)-methyl ether-methacrylate (POEGMA) brushes. PEG silane was grafted on the laponite nanoparticles in solution yielding homogeneous and transparent thin films via a dip coating procedure on glass and silicon substrates. POEGMA was grafted on laponite-(3-Aminopropyl)trimethoxysilane (APTMS) nanocomposite films that were processed similarly to PEG-silane using atom transfer radical polymerization (ATRP). Film characterization with, among others, Fourier transform infrared (FT-IR) spectroscopy, X-ray diffraction (XRD), and atomic force microscopy (AFM) attests to successful grafting of the polymers to the laponite nanoparticles. In particular, evidence of basal plane expansion of laponite with increasing silane concentration are obtained using XRD, while patent morphological changes are revealed with AFM. The results are discussed in terms of the different grafting sites on laponite and compared with literature. While LP-PEG-silane is easily applied to a surface from a precursor solution via a dip coating procedure LP-APTMS-OEGMA requires lots more chemicals, a thorough control of reaction parameters, and longer reaction time in order to generate films with the desirable properties. We therefore also addressed the antifouling properties of the films. These were tested together with control samples of bare glass and laponite thin films for 30 days in an algae container. More tests were conducted with fibroblast cell cultures. Our preliminary results show that grafting of PEG containing polymers and polymer brushes alters the properties of the laponite films from fouling to nonfouling surfaces. As a first estimate, the adhesion of particles (diatoms, algae, etc.) to surfaces is reduced by approximately 85% in the case of LP-PEG-silane and up to 92% in the case of LP-APTMS-POEGMA, in comparison to the control surfaces. Furthermore, practically no cell adhesion on such surfaces could be observed.
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Affiliation(s)
- Ekram Wassel
- Institute for Materials & Surface Technology, University of Applied Sciences , 24149 Kiel, Germany
| | - Martha Es-Souni
- Institute for Materials & Surface Technology, University of Applied Sciences , 24149 Kiel, Germany
- Cell Culture Laboratory, Clinic of Dentistry, University of Kiel , 24118 Kiel, Germany
| | - Nele Berger
- Institute for Materials & Surface Technology, University of Applied Sciences , 24149 Kiel, Germany
| | - Dimitri Schopf
- Institute for Materials & Surface Technology, University of Applied Sciences , 24149 Kiel, Germany
| | - Matthias Dietze
- Institute for Materials & Surface Technology, University of Applied Sciences , 24149 Kiel, Germany
| | - Claus-Henning Solterbeck
- Institute for Materials & Surface Technology, University of Applied Sciences , 24149 Kiel, Germany
| | - Mohammed Es-Souni
- Institute for Materials & Surface Technology, University of Applied Sciences , 24149 Kiel, Germany
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12
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Sriram KK, Nayak S, Pengel S, Chou CF, Erbe A. 10 nm deep, sub-nanoliter fluidic nanochannels on germanium for attenuated total reflection infrared (ATR-IR) spectroscopy. Analyst 2017; 142:273-278. [DOI: 10.1039/c6an01699e] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Nanoslits with a depth of ∼10 nm were manufactured on a germanium internal reflection element for attenuated internal reflection infrared spectroscopy.
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Affiliation(s)
| | - Simantini Nayak
- Max-Planck-Institut für Eisenforschung GmbH
- 40237 Düsseldorf
- Germany
| | - Stefanie Pengel
- Max-Planck-Institut für Eisenforschung GmbH
- 40237 Düsseldorf
- Germany
| | - Chia-Fu Chou
- Institute of Physics
- Academia Sinica
- Taiwan
- Research Centre for Applied Sciences
- Academia Sinica
| | - Andreas Erbe
- Max-Planck-Institut für Eisenforschung GmbH
- 40237 Düsseldorf
- Germany
- Department of Materials Science and Engineering
- NTNU
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13
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Henke K, Welte W, Hauser K. Direct Monitoring of β-Sheet Formation in the Outer Membrane Protein TtoA Assisted by TtOmp85. Biochemistry 2016; 55:4333-43. [PMID: 27400268 DOI: 10.1021/acs.biochem.6b00691] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Attenuated total reflection Fourier-transform infrared (ATR-FTIR) spectroscopy was applied to investigate the folding of an outer membrane protein, TtoA, assisted by TtOmp85, both from the thermophilic eubacterium Thermus thermophilus. To directly monitor the formation of β-sheet structure in TtoA and to analyze the function of TtOmp85, we immobilized unfolded TtoA on an ATR crystal. Interaction with TtOmp85 initiated TtoA folding as shown by time-dependent spectra recorded during the folding process. Our ATR-FTIR experiments prove that TtOmp85 possesses specific functionality to assist β-sheet formation of TtoA. We demonstrate the potential of this spectroscopic approach to study the interaction of outer membrane proteins in vitro and in a time-resolved manner.
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Affiliation(s)
- Katharina Henke
- Department of Chemistry, ‡Department of Biology, and §Konstanz Research School Chemical Biology, University of Konstanz , 78457 Konstanz, Germany
| | - Wolfram Welte
- Department of Chemistry, ‡Department of Biology, and §Konstanz Research School Chemical Biology, University of Konstanz , 78457 Konstanz, Germany
| | - Karin Hauser
- Department of Chemistry, ‡Department of Biology, and §Konstanz Research School Chemical Biology, University of Konstanz , 78457 Konstanz, Germany
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14
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Nanocrystalline diamond sensor targeted for selective CRP detection: an ATR-FTIR spectroscopy study. Anal Bioanal Chem 2016; 408:3675-80. [PMID: 27007740 DOI: 10.1007/s00216-016-9485-0] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2015] [Revised: 03/02/2016] [Accepted: 03/10/2016] [Indexed: 10/22/2022]
Abstract
Protein immobilization on functionalized fluorine-terminated nanocrystalline (NCD) films was studied by attenuated total reflection Fourier transform infrared (ATR-FTIR) spectroscopy using an immobilization protocol developed to specifically bind C-reactive protein (CRP). Using an ATR-FTIR spectroscopy method employing a force-controlled anvil-type configuration, three critical steps of the ex situ CRP immobilization were analyzed. First, the NCD surface was passivated by deposition of a copolymer layer consisting of polyethylene oxide and polypropylene oxide. Second, a synthetic modified polypeptide binder with high affinity to CRP was covalently attached to the polymeric film. Third, CRP dissolved in aqueous buffer in concentrations of 10-20 μg/mL was added on the functionalized NCD surface. Both the amide I and II bands, due to the polypeptide binder and CRP, were clearly observed in ATR-FTIR spectra. CRP amide I bands were extracted from difference spectra and yielded bands that agreed well with the reported amide I band of free (non-bonded) CRP in solution. Thus, our results show that CRP retains its secondary structure when it is attached to the polypeptide binders. Compared to previous IR studies of CRP in solution, about 200 times lower concentration was applied in the present study. Graphical Abstract Direct non-destructive ATR-FTIR analysis of C-reactive protein (CRP) selectively bound to functionalized nanocrystalline diamond (NCD) sensor surface.
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15
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Schartner J, Hoeck N, Güldenhaupt J, Mavarani L, Nabers A, Gerwert K, Kötting C. Chemical Functionalization of Germanium with Dextran Brushes for Immobilization of Proteins Revealed by Attenuated Total Reflection Fourier Transform Infrared Difference Spectroscopy. Anal Chem 2015; 87:7467-75. [PMID: 26102158 DOI: 10.1021/acs.analchem.5b01823] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Protein immobilization studied by attenuated total reflection Fourier transform infrared (ATR-FT-IR) difference spectroscopy is an emerging field enabling the study of proteins at atomic detail. Gold or glass surfaces are frequently used for protein immobilization. Here, we present an alternative method for protein immobilization on germanium. Because of its high refractive index and broad spectral window germanium is the best material for ATR-FT-IR spectroscopy of thin layers. So far, this technique was mainly used for protein monolayers, which lead to a limited signal-to-noise ratio. Further, undesired protein-protein interactions can occur in a dense layer. Here, the germanium surface was functionalized with thiols and stepwise a dextran brush was generated. Each step was monitored by ATR-FT-IR spectroscopy. We compared a 70 kDa dextran with a 500 kDa dextran regarding the binding properties. All surfaces were characterized by atomic force microscopy, revealing thicknesses between 40 and 110 nm. To analyze the capability of our system we utilized N-Ras on mono-NTA (nitrilotriacetic acid) functionalized dextran, and the amount of immobilized Ras corresponded to several monolayers. The protein stability and loading capacity was further improved by means of tris-NTA for immobilization. Small-molecule-induced changes were revealed with an over 3 times higher signal-to-noise ratio compared to monolayers. This improvement may allow the observation of very small and so far hidden changes in proteins upon stimulus. Furthermore, we immobilized green fluorescent protein (GFP) and mCherry simultaneously enabling an analysis of the surface by fluorescence microscopy. The absence of a Förster resonance energy transfer (FRET) signal demonstrated a large protein-protein distance, indicating an even distribution of the protein within the dextran.
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Affiliation(s)
- Jonas Schartner
- Department of Biophysics, Faculty of Biology and Biotechnology, Ruhr-University, 44801 Bochum, Germany
| | - Nina Hoeck
- Department of Biophysics, Faculty of Biology and Biotechnology, Ruhr-University, 44801 Bochum, Germany
| | - Jörn Güldenhaupt
- Department of Biophysics, Faculty of Biology and Biotechnology, Ruhr-University, 44801 Bochum, Germany
| | - Laven Mavarani
- Department of Biophysics, Faculty of Biology and Biotechnology, Ruhr-University, 44801 Bochum, Germany
| | - Andreas Nabers
- Department of Biophysics, Faculty of Biology and Biotechnology, Ruhr-University, 44801 Bochum, Germany
| | - Klaus Gerwert
- Department of Biophysics, Faculty of Biology and Biotechnology, Ruhr-University, 44801 Bochum, Germany
| | - Carsten Kötting
- Department of Biophysics, Faculty of Biology and Biotechnology, Ruhr-University, 44801 Bochum, Germany
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16
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Baranowska M, Slota AJ, Eravuchira PJ, Alba M, Formentin P, Pallarès J, Ferré-Borrull J, Marsal LF. Protein attachment to silane-functionalized porous silicon: A comparison of electrostatic and covalent attachment. J Colloid Interface Sci 2015; 452:180-189. [PMID: 25942096 DOI: 10.1016/j.jcis.2015.04.022] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2015] [Revised: 04/09/2015] [Accepted: 04/14/2015] [Indexed: 12/31/2022]
Abstract
Porous silicon (pSi) is a prosperous biomaterial, biocompatible, and biodegradable. Obtaining regularly functionalized pSi surfaces is required in many biotechnology applications. Silane-PEG-NHS (triethoxysilane-polyethylene-glycol-N-hydroxysuccinimide) is useful for single-molecule studies due to its ability to attach to only one biomolecule. We investigate the functionalization of pSi with silane-PEG-NHS and compare it with two common grafting agents: APTMS (3-aminopropylotrimethoxysilane) as electrostatic linker, and APTMS modified with glutaraldehyde as covalent spacer. We show the arrangement of two proteins (collagen and bovine serum albumin) as a function of the functionalization and of the pore size. FTIR is used to demonstrate correct functionalization while fluorescence confocal microscopy reveals that silane-PEG-NHS results in a more uniform protein distribution. Reflection interference spectroscopy (RIfS) is used to estimate the attachment of linker and proteins. The results open a way to obtain homogenous chemical modified silicon supports with a great value in biosensing, drug delivery and cell biology.
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Affiliation(s)
- Malgorzata Baranowska
- Departament d'Enginyeria Electrònica, Elèctrica i Automàtica, Universitat Rovira i Virgili, Avda. Països Catalans 26, Tarragona 43007, Spain
| | - Agata J Slota
- Departament d'Enginyeria Electrònica, Elèctrica i Automàtica, Universitat Rovira i Virgili, Avda. Països Catalans 26, Tarragona 43007, Spain
| | - Pinkie J Eravuchira
- Departament d'Enginyeria Electrònica, Elèctrica i Automàtica, Universitat Rovira i Virgili, Avda. Països Catalans 26, Tarragona 43007, Spain
| | - Maria Alba
- Departament d'Enginyeria Electrònica, Elèctrica i Automàtica, Universitat Rovira i Virgili, Avda. Països Catalans 26, Tarragona 43007, Spain
| | - Pilar Formentin
- Departament d'Enginyeria Electrònica, Elèctrica i Automàtica, Universitat Rovira i Virgili, Avda. Països Catalans 26, Tarragona 43007, Spain
| | - Josep Pallarès
- Departament d'Enginyeria Electrònica, Elèctrica i Automàtica, Universitat Rovira i Virgili, Avda. Països Catalans 26, Tarragona 43007, Spain
| | - Josep Ferré-Borrull
- Departament d'Enginyeria Electrònica, Elèctrica i Automàtica, Universitat Rovira i Virgili, Avda. Països Catalans 26, Tarragona 43007, Spain.
| | - Lluís F Marsal
- Departament d'Enginyeria Electrònica, Elèctrica i Automàtica, Universitat Rovira i Virgili, Avda. Països Catalans 26, Tarragona 43007, Spain.
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17
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Maldiney T, Rémond M, Bessodes M, Scherman D, Richard C. Controlling aminosilane layer thickness to extend the plasma half-life of stealth persistent luminescence nanoparticles in vivo. J Mater Chem B 2015; 3:4009-4016. [PMID: 32262622 DOI: 10.1039/c5tb00146c] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Therapeutics and diagnostics both initiated the development and rational design of nanoparticles intended for biomedical applications. Yet, the fate of these nanosystems in vivo is hardly manageable and generally results in their rapid uptake by the mononuclear phagocyte system, i.e. liver and spleen. To overcome this essential limitation, efforts have been made to understand the influence of physico-chemical parameters on the behaviour of nanoparticles in vivo and on their ability to be uptaken by phagocytic cells. Notably, polyethylene glycol grafting and precise control of its density have not only been shown to prevent protein adsorption on the surface of nanoparticles, but also to significantly reduce macrophage uptake in vitro. In this article, we suggest the use of persistent luminescence to study the influence of another parameter, aminosilane layer thickness, on both in vitro protein adsorption and in vivo biodistribution of stealth persistent nanophosphors.
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Affiliation(s)
- Thomas Maldiney
- Unité de Technologies Chimiques et Biologiques pour la Santé (UTCBS), CNRS UMR 8258, INSERM U 1022, Paris, F-75270 cedex France
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18
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Collins G, Aureau D, Holmes JD, Etcheberry A, O'Dwyer C. Germanium oxide removal by citric acid and thiol passivation from citric acid-terminated Ge(100). LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:14123-14127. [PMID: 25396678 DOI: 10.1021/la503819z] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Many applications of germanium (Ge) are underpinned by effective oxide removal and surface passivation. This important surface treatment step often requires H-X (X = Cl, Br, I) or HF etchants. Here, we show that aqueous citric acid solutions are effective in the removal of GeOx. The stability of citric acid-treated Ge(100) is compared to HF and HCl treated surfaces and analyzed by X-ray photoelectron spectroscopy. Further Ge surface passivation was investigated by thiolation using alkane monothiols and dithiols. The organic passivation layers show good stability with no oxide regrowth observed after 3 days of ambient exposure.
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Affiliation(s)
- Gillian Collins
- Department of Chemistry, University College Cork , Cork, Ireland
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19
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Schartner J, Gavriljuk K, Nabers A, Weide P, Muhler M, Gerwert K, Kötting C. Immobilization of Proteins in their Physiological Active State at Functionalized Thiol Monolayers on ATR-Germanium Crystals. Chembiochem 2014; 15:2529-34. [DOI: 10.1002/cbic.201402478] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2014] [Indexed: 11/09/2022]
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20
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Kim M, Lee M, Lee H. Adsorption Selectivities between Hydroxypyridine and Pyridone Adsorbed on the Ge(100) Surface: Conjugation and Geometric Configuration Effects on Adsorption Structures. B KOREAN CHEM SOC 2014. [DOI: 10.5012/bkcs.2014.35.2.581] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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21
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Hammaecher C, Joris B, Goormaghtigh E, Marchand-Brynaert J. Photoactivable Nonsymmetrical Bifunctional Linkers for Protein Immobilization on Attenuated Total Reflectance FTIR Optical Devices. European J Org Chem 2013. [DOI: 10.1002/ejoc.201300939] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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22
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Schartner J, Güldenhaupt J, Mei B, Rögner M, Muhler M, Gerwert K, Kötting C. Universal Method for Protein Immobilization on Chemically Functionalized Germanium Investigated by ATR-FTIR Difference Spectroscopy. J Am Chem Soc 2013; 135:4079-87. [DOI: 10.1021/ja400253p] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jonas Schartner
- Department
of Biophysics and ‡Department of Plant Biochemistry, Faculty of Biology
and Biotechnology, and §Laboratory of Industrial Chemistry, Faculty of Chemistry
and Biochemistry, Ruhr-University Bochum, Germany
| | - Jörn Güldenhaupt
- Department
of Biophysics and ‡Department of Plant Biochemistry, Faculty of Biology
and Biotechnology, and §Laboratory of Industrial Chemistry, Faculty of Chemistry
and Biochemistry, Ruhr-University Bochum, Germany
| | - Bastian Mei
- Department
of Biophysics and ‡Department of Plant Biochemistry, Faculty of Biology
and Biotechnology, and §Laboratory of Industrial Chemistry, Faculty of Chemistry
and Biochemistry, Ruhr-University Bochum, Germany
| | - Matthias Rögner
- Department
of Biophysics and ‡Department of Plant Biochemistry, Faculty of Biology
and Biotechnology, and §Laboratory of Industrial Chemistry, Faculty of Chemistry
and Biochemistry, Ruhr-University Bochum, Germany
| | - Martin Muhler
- Department
of Biophysics and ‡Department of Plant Biochemistry, Faculty of Biology
and Biotechnology, and §Laboratory of Industrial Chemistry, Faculty of Chemistry
and Biochemistry, Ruhr-University Bochum, Germany
| | - Klaus Gerwert
- Department
of Biophysics and ‡Department of Plant Biochemistry, Faculty of Biology
and Biotechnology, and §Laboratory of Industrial Chemistry, Faculty of Chemistry
and Biochemistry, Ruhr-University Bochum, Germany
| | - Carsten Kötting
- Department
of Biophysics and ‡Department of Plant Biochemistry, Faculty of Biology
and Biotechnology, and §Laboratory of Industrial Chemistry, Faculty of Chemistry
and Biochemistry, Ruhr-University Bochum, Germany
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23
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Moussa SG, Stern AC, Raff JD, Dilbeck CW, Tobias DJ, Finlayson-Pitts BJ. Experimental and theoretical studies of the interaction of gas phase nitric acid and water with a self-assembled monolayer. Phys Chem Chem Phys 2013; 15:448-58. [DOI: 10.1039/c2cp42405c] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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24
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Wu M, Brooks NR, Schaltin S, Binnemans K, Fransaer J. Electrodeposition of germanium from the ionic liquid 1-butyl-1-methylpyrrolidinium dicyanamide. Phys Chem Chem Phys 2013; 15:4955-64. [DOI: 10.1039/c3cp44554b] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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25
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Fernandez LR, Vandenbussche G, Roosens N, Govaerts C, Goormaghtigh E, Verbruggen N. Metal binding properties and structure of a type III metallothionein from the metal hyperaccumulator plant Noccaea caerulescens. BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS 2012; 1824:1016-23. [DOI: 10.1016/j.bbapap.2012.05.010] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/24/2012] [Revised: 05/07/2012] [Accepted: 05/25/2012] [Indexed: 11/30/2022]
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26
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Fyrner T, Svensson SC, Konradsson P. Synthesis of tri-, penta-, and heptasaccharides, functionalized with orthogonally N-protected amino residues at the reducing and non-reducing ends. Tetrahedron 2012. [DOI: 10.1016/j.tet.2012.05.118] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
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27
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Moreau J, Marchand-Brynaert J. Modular Synthesis of Bifunctional Linkers for Materials Science. European J Org Chem 2011. [DOI: 10.1002/ejoc.201001666] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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28
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Holmberg VC, Rasch MR, Korgel BA. PEGylation of carboxylic acid-functionalized germanium nanowires. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:14241-14246. [PMID: 20698505 DOI: 10.1021/la102124y] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Germanium (Ge) nanowires were produced in solution by supercritical fluid-liquid-solid (SFLS) growth and then functionalized with carboxylic acid groups by in situ thermal thiolation with mercaptoundecanoic acid. Polyethylene glycol (PEG) was grafted to the carboxylic acid-terminated Ge nanowires using carbodiimide coupling chemistry. The nanowires were characterized using attenuated total reflectance Fourier transform infrared (ATR-FTIR) spectroscopy and transmission electron microscopy (TEM) to confirm the surface modification of the nanowires. Dispersions of PEGylated Ge nanowires in dimethylsulfoxide (DMSO) were stable for days. The PEGylated Ge nanowires were also dispersible in aqueous solution over a wide range of pH and ionic strength.
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Affiliation(s)
- Vincent C Holmberg
- Department of Chemical Engineering, Texas Materials Institute, and Center for Nano- and Molecular Science and Technology, The University of Texas at Austin, Austin, Texas 78712-1062, USA
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29
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Moussa SG, Finlayson-Pitts BJ. Reaction of gas phase OH with unsaturated self-assembled monolayers and relevance to atmospheric organic oxidations. Phys Chem Chem Phys 2010; 12:9419-28. [PMID: 20532334 DOI: 10.1039/c000447b] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
The kinetics and mechanisms of the reaction of gas phase OH radicals with organics on surfaces are of fundamental chemical interest, as well as relevant to understanding the degradation of organics on tropospheric surfaces or when they are components of airborne particles. We report here studies of the oxidation of a terminal alkene self-assembled monolayer (7-octenyltrichlorosilane, C8= SAM) on a germanium attenuated total reflectance crystal by OH radicals at a concentration of 2.1 x 10(5) cm(-3) at 1 atm total pressure and 298 K in air. Loss of the reactant SAM and the formation of surface products were followed in real time using infrared spectroscopy. From the rate of loss of the C=C bond, a reaction probability within experimental error of unity was derived. The products formed on the surface include organic nitrates and carbonyl compounds, with yields of 10 +/- 4% and < or = 7 +/- 4%, respectively, and there is evidence for the formation of organic products with C-O bonds such as alcohols, ethers and/or alkyl peroxides and possibly peroxynitrates. The yield of organic nitrates relative to carbonyl compounds is higher than expected based on analogous gas phase mechanisms, suggesting that the branching ratio for the RO(2) + NO reaction is shifted to favor the formation of organic nitrates when the reaction occurs on a surface. Water uptake onto the surface was only slightly enhanced upon oxidation, suggesting that oxidation per se cannot be taken as a predictor of increased hydrophilicity of atmospheric organics. These experiments indicate that the mechanisms for the surface reactions are different from gas phase reactions, but the OH oxidation of surface species will still be a significant contributor to determining their lifetimes in air.
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Affiliation(s)
- Samar G Moussa
- Department of Chemistry, University of California, Irvine, California 92697-2025, USA
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30
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Light-Induced Functionalization of Amphiphilic Block Copolymers: Application to Nanoparticles for Drug Targeting. ACTA ACUST UNITED AC 2010. [DOI: 10.4028/www.scientific.net/msf.636-637.759] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Photografting of bifunctional photolinker on biocompatible amphiphilic copolymers, such as PCL-b-PEGs and PLGA-b-PEGs, has been developed as a practical and versatile strategy for the materials functionalisation. Depending on the copolymer nature (block length, % of crystallinity) and the experimental conditions we could selectively direct the grafting on the hydrophilic PEG segments. The resulting copolymers were further derivatized with molecules of interest (RGD-peptides, LDV-peptides, “home-made”peptidomimetics, mannose derivatives,…) by substitution of the O-succinimidyl ester of the photolinker. The derivatization rates were controlled by radiolabelling, colorimetric assay and XPS spectroscopy. The functionalized copolymers were used in the formulation of nanoparticles displaying the ligands on their outer-shell. This nanoparticulate system was successfully employed for the oral vectorisation of antigen and for the targeted delivery of an anticancer drug.
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31
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Turner NW, Cauchi M, Piletska EV, Preston C, Piletsky SA. Rapid qualitative and quantitative analysis of opiates in extract of poppy head via FTIR and chemometrics: Towards in-field sensors. Biosens Bioelectron 2009; 24:3322-8. [DOI: 10.1016/j.bios.2009.04.030] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2009] [Revised: 04/17/2009] [Accepted: 04/22/2009] [Indexed: 11/15/2022]
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32
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Goormaghtigh E, Gasper R, Bénard A, Goldsztein A, Raussens V. Protein secondary structure content in solution, films and tissues: redundancy and complementarity of the information content in circular dichroism, transmission and ATR FTIR spectra. BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS 2009; 1794:1332-43. [PMID: 19540367 DOI: 10.1016/j.bbapap.2009.06.007] [Citation(s) in RCA: 84] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/07/2009] [Revised: 05/25/2009] [Accepted: 06/03/2009] [Indexed: 11/27/2022]
Abstract
The paper presents a simple and robust method to determine protein secondary structure from circular dichroism, transmission and attenuated total reflection (ATR) Fourier transform infrared spectra. It is found that the different spectroscopic methods bring valuable but roughly identical information on the secondary structure of proteins. ATR and transmission FTIR spectra display distinct differences, yet the secondary structure can be predicted from their spectra with roughly the same success. It is also found that one wavenumber or wavelength includes the large majority of the information correlated with secondary structure content and no more than 3 significant independent wavenumbers/wavelengths could be found for any of the spectroscopic data. This finding indicates that more complex linear combinations of the absorbance or ellipticities will not further improve secondary structure predictions. Furthermore, the information content in CD, transmission and ATR FTIR spectra is largely redundant. If combining CD and FTIR results in some improvement of structure prediction quality, the improvement is too modest to prompt spectroscopists to collect different spectroscopic data for structure prediction purposes. On the other hand, the data collected show that the quality of the FTIR spectrometers is such that biosensors or imaging methods sampling from 10(-9) to 10(-15) g yield spectra of sufficient quality to analyze protein secondary structure. These new techniques open the way to a new area of research, both in protein conformational response to ligand and imaging at sub-cellular scales.
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Affiliation(s)
- Erik Goormaghtigh
- Center for Structural Biology and Bioinformatics, Laboratory for the Structure and Function of Biological Membranes, Campus Plaine CP206/02; Université Libre de Bruxelles, Bld du Triomphe 2, CP206/2, B1050 Brussels, Belgium.
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