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Grachev V, Deschaume O, Lang PR, Lettinga MP, Bartic C, Thielemans W. Dimensions of Cellulose Nanocrystals from Cotton and Bacterial Cellulose: Comparison of Microscopy and Scattering Techniques. Nanomaterials (Basel) 2024; 14:455. [PMID: 38470785 DOI: 10.3390/nano14050455] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/31/2024] [Revised: 02/25/2024] [Accepted: 02/26/2024] [Indexed: 03/14/2024]
Abstract
Different microscopy and scattering methods used in the literature to determine the dimensions of cellulose nanocrystals derived from cotton and bacterial cellulose were compared to investigate potential bias and discrepancies. Atomic force microscopy (AFM), small-angle X-ray scattering (SAXS), depolarized dynamic light scattering (DDLS), and static light scattering (SLS) were compared. The lengths, widths, and heights of the particles and their respective distributions were determined by AFM. In agreement with previous work, the CNCs were found to have a ribbon-like shape, regardless of the source of cellulose or the surface functional groups. Tip broadening and agglomeration of the particles during deposition cause AFM-derived lateral dimensions to be systematically larger those obtained from SAXS measurements. The radius of gyration determined by SLS showed a good correlation with the dimensions obtained by AFM. The hydrodynamic lateral dimensions determined by DDLS were found to have the same magnitude as either the width or height obtained from the other techniques; however, the precision of DDLS was limited due to the mismatch between the cylindrical model and the actual shape of the CNCs, and to constraints in the fitting procedure. Therefore, the combination of AFM and SAXS, or microscopy and small-angle scattering, is recommended for the most accurate determination of CNC dimensions.
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Affiliation(s)
- Vladimir Grachev
- Sustainable Materials Lab, Department of Chemical Engineering, KU Leuven, Campus Kulak Kortrijk, Etienne Sabbelaan 53, 8500 Kortrijk, Belgium
| | - Olivier Deschaume
- Laboratory for Soft Matter Physics and Biophysics, Department of Physics and Astronomy, KU Leuven, Celestijnenlaan 200D Box 2416, 3001 Leuven, Belgium
| | - Peter R Lang
- Institute for Biomacromolecular Systems and Processes Group (IBI-4), Forschungszentrum Jülich, Wilhelm-Johnen-Straße, 52428 Jülich, Germany
| | - Minne Paul Lettinga
- Laboratory for Soft Matter Physics and Biophysics, Department of Physics and Astronomy, KU Leuven, Celestijnenlaan 200D Box 2416, 3001 Leuven, Belgium
- Institute for Biomacromolecular Systems and Processes Group (IBI-4), Forschungszentrum Jülich, Wilhelm-Johnen-Straße, 52428 Jülich, Germany
| | - Carmen Bartic
- Laboratory for Soft Matter Physics and Biophysics, Department of Physics and Astronomy, KU Leuven, Celestijnenlaan 200D Box 2416, 3001 Leuven, Belgium
| | - Wim Thielemans
- Sustainable Materials Lab, Department of Chemical Engineering, KU Leuven, Campus Kulak Kortrijk, Etienne Sabbelaan 53, 8500 Kortrijk, Belgium
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Arslanova A, Matthé I, Deschaume O, Bartic C, Monnens W, Reichel EK, Reddy N, Fransaer J, Clasen C. Sideways propelled bimetallic rods at the water/oil interface. Soft Matter 2023; 19:6896-6902. [PMID: 37606644 DOI: 10.1039/d3sm00466j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/23/2023]
Abstract
The motion of self-propelling microswimmers is significantly affected by confinement, which can enhance or reduce their mobility and also steer the direction of their propulsion. While their interactions with solid boundaries have already received considerable attention, many aspects of the influence of liquid-liquid interfaces (LLI) on active particle propulsion still remain unexplored. In this work, we studied the adsorption and motion of bimetallic Janus sideways propelled rods dispersed at the interface between an aqueous solution of hydrogen peroxide and oil. The wetting properties of the bimetallic rods result in a wide distribution of their velocities at the LLI. While a fraction of rods remain immotile, we note a significant enhancement of motility for the rest of the particles with velocities of up to 8 times higher in comparison to those observed near a solid wall. Liquid-liquid interfaces, therefore, can provide a new way to regulate the propulsion of bimetallic particles.
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Affiliation(s)
- Alina Arslanova
- Department of Chemical Engineering, KU Leuven, 3001 Leuven, Belgium.
| | - Ine Matthé
- Department of Chemical Engineering, KU Leuven, 3001 Leuven, Belgium.
| | | | - Carmen Bartic
- Department of Physics, KU Leuven, 3001 Leuven, Belgium
| | - Wouter Monnens
- Department of Materials Engineering, KU Leuven, 3001 Leuven, Belgium
| | - Erwin Konrad Reichel
- Institute for Microelectronics and Microsensors, Johannes Kepler University, Altenberger Strasse 69, 4040 Linz, Austria
| | - Naveen Reddy
- Faculty of Engineering Technology, University of Hasselt, Martelarenlaan 42, 3500 Hasselt, Belgium
- IMO-IMOMEC, Wetenschapspark 1, 3590 Diepenbeek, Belgium
| | - Jan Fransaer
- Department of Materials Engineering, KU Leuven, 3001 Leuven, Belgium
| | - Christian Clasen
- Department of Chemical Engineering, KU Leuven, 3001 Leuven, Belgium.
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Wellens J, Deschaume O, Putzeys T, Eyley S, Thielemans W, Verhaert N, Bartic C. Sulfobetaine-based ultrathin coatings as effective antifouling layers for implantable neuroprosthetic devices. Biosens Bioelectron 2023; 226:115121. [PMID: 36774733 DOI: 10.1016/j.bios.2023.115121] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2022] [Revised: 01/30/2023] [Accepted: 02/02/2023] [Indexed: 02/05/2023]
Abstract
Foreign body response (FBR), inflammation, and fibrotic encapsulation of neural implants remain major problems affecting the impedance of the electrode-tissue interface and altering the device performance. Adhesion of proteins and cells (e.g., pro-inflammatory macrophages, and fibroblasts) triggers the FBR cascade and can be diminished by applying antifouling coatings onto the implanted devices. In this paper, we report the deposition and characterization of a thin (±6 nm) sulfobetaine-based coating onto microfabricated platinum electrodes and cochlear implant (CI) electrode arrays. We found that this coating has stable cell and protein-repellent properties, for at least 31 days in vitro, not affected by electrical stimulation protocols. Additionally, its effect on the electrochemical properties relevant to stimulation (i.e., impedance, charge injection capacity) was negligible. When applied to clinical CI electrode arrays, the film was successful at inhibiting fibroblast adhesion on both the silicone packaging and the platinum/iridium electrodes. In vitro, in fibroblast cultures, coated CI electrode arrays maintained impedance values up to five times lower compared to non-coated devices. Our studies demonstrate that such thin sulfobetaine containing layers are stable and prevent protein and cell adhesion in vitro and are compatible for use on CI electrode arrays. Future in vivo studies should be conducted to investigate its ability to mitigate biofouling, fibrosis, and the resulting impedance changes upon long-term implantation in vivo.
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Affiliation(s)
- Jolan Wellens
- Laboratory for Soft Matter and Biophysics, Dept. Physics and Astronomy, KU Leuven, Celestijnenlaan 200D, 3001, Leuven, Belgium
| | - Olivier Deschaume
- Laboratory for Soft Matter and Biophysics, Dept. Physics and Astronomy, KU Leuven, Celestijnenlaan 200D, 3001, Leuven, Belgium
| | - Tristan Putzeys
- Laboratory for Soft Matter and Biophysics, Dept. Physics and Astronomy, KU Leuven, Celestijnenlaan 200D, 3001, Leuven, Belgium; Experimental Oto-rhino-laryngology Research Group, Dept. Neuroscience, KU Leuven, Herestraat 49, 3000, Leuven, Belgium
| | - Samuel Eyley
- Sustainable Materials Lab, Department of Chemical Engineering, KU Leuven, Campus Kulak Kortrijk, Etienne Sabbelaan 53, 8500, Kortrijk, Belgium
| | - Wim Thielemans
- Sustainable Materials Lab, Department of Chemical Engineering, KU Leuven, Campus Kulak Kortrijk, Etienne Sabbelaan 53, 8500, Kortrijk, Belgium
| | - Nicolas Verhaert
- Experimental Oto-rhino-laryngology Research Group, Dept. Neuroscience, KU Leuven, Herestraat 49, 3000, Leuven, Belgium; Department of Otorhinolaryngology, University Hospitals Leuven, Herestraat 49, 3000, Leuven, Belgium
| | - Carmen Bartic
- Laboratory for Soft Matter and Biophysics, Dept. Physics and Astronomy, KU Leuven, Celestijnenlaan 200D, 3001, Leuven, Belgium.
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Dedroog LM, Deschaume O, Abrego CJG, Koos E, de Coene Y, Vananroye A, Thielemans W, Bartic C, Lettinga MP. Stress-controlled shear flow alignment of collagen type I hydrogel systems. Acta Biomater 2022; 150:128-137. [PMID: 35842033 DOI: 10.1016/j.actbio.2022.07.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2022] [Revised: 06/30/2022] [Accepted: 07/05/2022] [Indexed: 11/17/2022]
Abstract
Disease research and drug screening platforms require in vitro model systems with cellular cues resembling those of natural tissues. Fibrillar alignment, occurring naturally in extracellular matrices, is one of the crucial attributes in tissue development. Obtaining fiber alignment in 3D, in vitro remains an important challenge due to non-linear material characteristics. Here, we report a cell-compatible, shear stress-based method allowing to obtain 3D homogeneously aligned fibrillar collagen hydrogels. Controlling the shear-stress during gelation results in low strain rates, with negligible effects on the viability of embedded SH-SY5Y cells. Our approach offers reproducibility and tunability through a paradigm shift: The shear-stress initiation moment, being the critical optimization parameter in the process, is related to the modulus of the developing gel, whereas state of the art methods often rely on a predefined time to initiate the alignment procedure. After curing, the induced 3D alignment is maintained after the release of stress, with a linear relation between the total acquired strain and the fiber alignment. This method is generally applicable to 3D fibrillar materials and stress/pressure-controlled setups, making it a valuable addition to the fast-growing field of tissue engineering. STATEMENT OF SIGNIFICANCE: Controlling fiber alignment in vitro 3D hydrogels is crucial for developing physiologically relevant model systems. However, it remains challenging due to the non-linear material characteristics of fibrillar hydrogels, limiting the scalability and repeatability. Our approach tackles these challenges by utilizing a stress-controlled rheometer allowing us to monitor structural changes in situ and determine the optimal moment for applying a shear-stress inducing alignment. By careful parameter control, we infer the relationship between time, induced strain, alignment and biocompatibility. This tunable and reproducible method is both scalable and generally applicable to any fibrillar hydrogel, therefore, we believe it is useful for research investigating the link between matrix anisotropy and cell behavior in 3D systems, organ-on-chip technologies and drug research.
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Affiliation(s)
- Lens M Dedroog
- Soft Matter Physics and Biophysics Unit, Department of Physics and Astronomy, KU Leuven, 3001 Leuven, Belgium
| | - Olivier Deschaume
- Soft Matter Physics and Biophysics Unit, Department of Physics and Astronomy, KU Leuven, 3001 Leuven, Belgium
| | - Christian J Garcia Abrego
- Soft Matter Physics and Biophysics Unit, Department of Physics and Astronomy, KU Leuven, 3001 Leuven, Belgium
| | - Erin Koos
- Soft Matter, Rheology and Technology, Department of Chemical Engineering, KU Leuven, 3001 Leuven, Belgium
| | - Yovan de Coene
- Molecular Imaging and Photonics Unit, Department of Chemistry, KU Leuven, 3001 Leuven, Belgium
| | - Anja Vananroye
- Soft Matter, Rheology and Technology, Department of Chemical Engineering, KU Leuven, 3001 Leuven, Belgium
| | - Wim Thielemans
- Sustainable Materials Lab Research Group, Department of Chemical Engineering, KU Leuven, Campus Kulak Kortrijk, 8500 Kortrijk, Belgium
| | - Carmen Bartic
- Soft Matter Physics and Biophysics Unit, Department of Physics and Astronomy, KU Leuven, 3001 Leuven, Belgium
| | - Minne P Lettinga
- Soft Matter Physics and Biophysics Unit, Department of Physics and Astronomy, KU Leuven, 3001 Leuven, Belgium; Biological Information Processing IB-4, Forschungszentrum Jülich, 52425 Jülich, Germany.
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de Coene Y, Jooken S, Deschaume O, Van Steenbergen V, Vanden Berghe P, Van den Haute C, Baekelandt V, Callewaert G, Van Cleuvenbergen S, Verbiest T, Bartic C, Clays K. Label-Free Imaging of Membrane Potentials by Intramembrane Field Modulation, Assessed by Second Harmonic Generation Microscopy. Small 2022; 18:e2200205. [PMID: 35355419 DOI: 10.1002/smll.202200205] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/11/2022] [Revised: 03/03/2022] [Indexed: 06/14/2023]
Abstract
Optical interrogation of cellular electrical activity has proven itself essential for understanding cellular function and communication in complex networks. Voltage-sensitive dyes are important tools for assessing excitability but these highly lipophilic sensors may affect cellular function. Label-free techniques offer a major advantage as they eliminate the need for these external probes. In this work, it is shown that endogenous second-harmonic generation (SHG) from live cells is highly sensitive to changes in transmembrane potential (TMP). Simultaneous electrophysiological control of a living human embryonic kidney (HEK293T) cell, through a whole-cell voltage-clamp reveals a linear relation between the SHG intensity and membrane voltage. The results suggest that due to the high ionic strengths and fast optical response of biofluids, membrane hydration is not the main contributor to the observed field sensitivity. A conceptual framework is further provided that indicates that the SHG voltage sensitivity reflects the electric field within the biological asymmetric lipid bilayer owing to a nonzero χeff(2) tensor. Changing the TMP without surface modifications such as electrolyte screening offers high optical sensitivity to membrane voltage (≈40% per 100 mV), indicating the power of SHG for label-free read-out. These results hold promise for the design of a non-invasive label-free read-out tool for electrogenic cells.
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Affiliation(s)
- Yovan de Coene
- Laboratory of Molecular Imaging and Photonics, Department of Chemistry, KU Leuven, Celestijnenlaan 200D, Leuven, 3001, Belgium
| | - Stijn Jooken
- Laboratory of Soft Matter and Biophysics, Department of Physics and Astronomy, KU Leuven, Celestijnenlaan 200D, Leuven, 3001, Belgium
| | - Olivier Deschaume
- Laboratory of Soft Matter and Biophysics, Department of Physics and Astronomy, KU Leuven, Celestijnenlaan 200D, Leuven, 3001, Belgium
| | - Valérie Van Steenbergen
- Laboratory for Enteric NeuroScience (LENS), TAGRID, Department of Chronic Diseases Metabolism and Ageing, Ku Leuven, ON I Herestraat 49, Leuven, 3000, Belgium
| | - Pieter Vanden Berghe
- Laboratory for Enteric NeuroScience (LENS), TAGRID, Department of Chronic Diseases Metabolism and Ageing, Ku Leuven, ON I Herestraat 49, Leuven, 3000, Belgium
| | - Chris Van den Haute
- Laboratory for Neurobiology and Gene Therapy, Department of Neurosciences, Ku Leuven, RK-Herestraat 49, Leuven, 3000, Belgium
| | - Veerle Baekelandt
- Laboratory for Neurobiology and Gene Therapy, Department of Neurosciences, Ku Leuven, RK-Herestraat 49, Leuven, 3000, Belgium
| | - Geert Callewaert
- Department of Cellular and Molecular Medicine, Ku Leuven, KULAK Kortrijk Campus, Etienne Sabbelaan 53, Kortrijk, 8500, Belgium
| | - Stijn Van Cleuvenbergen
- Laboratory of Molecular Imaging and Photonics, Department of Chemistry, KU Leuven, Celestijnenlaan 200D, Leuven, 3001, Belgium
| | - Thierry Verbiest
- Laboratory of Molecular Imaging and Photonics, Department of Chemistry, KU Leuven, Celestijnenlaan 200D, Leuven, 3001, Belgium
| | - Carmen Bartic
- Laboratory of Soft Matter and Biophysics, Department of Physics and Astronomy, KU Leuven, Celestijnenlaan 200D, Leuven, 3001, Belgium
| | - Koen Clays
- Laboratory of Molecular Imaging and Photonics, Department of Chemistry, KU Leuven, Celestijnenlaan 200D, Leuven, 3001, Belgium
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Deleanu M, Deschaume O, Cipelletti L, Hernandez JF, Bartic C, Cottet H, Chamieh J. Taylor Dispersion Analysis and Atomic Force Microscopy Provide a Quantitative Insight into the Aggregation Kinetics of Aβ (1-40)/Aβ (1-42) Amyloid Peptide Mixtures. ACS Chem Neurosci 2022; 13:786-795. [PMID: 35201761 DOI: 10.1021/acschemneuro.1c00784] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
Abstract
Aggregation of amyloid β peptides is known to be one of the main processes responsible for Alzheimer's disease. The resulting dementia is believed to be due in part to the formation of potentially toxic oligomers. However, the study of such intermediates and the understanding of how they form are very challenging because they are heterogeneous and transient in nature. Unfortunately, few techniques can quantify, in real time, the proportion and the size of the different soluble species during the aggregation process. In a previous work (Deleanu et al. Anal. Chem. 2021, 93, 6523-6533), we showed the potential of Taylor dispersion analysis (TDA) in amyloid speciation during the aggregation process of Aβ (1-40) and Aβ (1-42). The current work aims at exploring in detail the aggregation of amyloid Aβ (1-40):Aβ (1-42) peptide mixtures with different proportions of each peptide (1:0, 3:1, 1:1, 1:3, and 0:1) using TDA and atomic force microscopy (AFM). TDA allowed for monitoring the kinetics of the amyloid assembly and quantifying the transient intermediates. Complementarily, AFM allowed the formation of insoluble fibrils to be visualized. Together, the two techniques enabled us to study the influence of the peptide ratios on the kinetics and the formation of potentially toxic oligomeric species.
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Affiliation(s)
- Mihai Deleanu
- IBMM, Univ Montpellier, CNRS, ENSCM, 34095 Montpellier, France
| | - Olivier Deschaume
- Department of Physics and Astronomy, Soft-Matter Physics and Biophysics Section, KU Leuven, Celestijnenlaan 200D, Box 2416, 3001 Heverlee, Belgium
| | - Luca Cipelletti
- L2C, Université Montpellier, 34095 Montpellier, France
- Institut Universitaire de France (IUF), Paris, France
| | | | - Carmen Bartic
- Department of Physics and Astronomy, Soft-Matter Physics and Biophysics Section, KU Leuven, Celestijnenlaan 200D, Box 2416, 3001 Heverlee, Belgium
| | - Hervé Cottet
- IBMM, Univ Montpellier, CNRS, ENSCM, 34095 Montpellier, France
| | - Joseph Chamieh
- IBMM, Univ Montpellier, CNRS, ENSCM, 34095 Montpellier, France
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Reynders H, Van Zundert I, Silva R, Carlier B, Deschaume O, Bartic C, Rocha S, Basov S, Van Bael MJ, Himmelreich U, Verbiest T, Zamora A. Label-Free Iron Oxide Nanoparticles as Multimodal Contrast Agents in Cells Using Multi-Photon and Magnetic Resonance Imaging. Int J Nanomedicine 2021; 16:8375-8389. [PMID: 35002233 PMCID: PMC8722578 DOI: 10.2147/ijn.s334482] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2021] [Accepted: 10/29/2021] [Indexed: 12/25/2022] Open
Abstract
INTRODUCTION The inherent fluorescence properties of iron oxide nanoparticles (IONPs) were characterized, and their applicability for multiphoton imaging in cells was tested in combination with their magnetic resonance imaging (MRI) capabilities. METHODS Superparamagnetic iron oxide nanoparticles were synthesized and subsequently coated with polyethylene glycol to make them water-dispersible. Further characterization of the particles was performed using Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), dynamic light scattering (DLS), superconducting quantum interference device (SQUID) and magnetic resonance relaxivity measurements. MRI and fluorescence properties of bare IONPs were first studied in solution and subsequently in A549-labeled cells. RESULTS The particles, with a core size of 11.3 ± 4.5 nm, showed a good negative MRI contrast in tissue-mimicking phantoms. In vitro studies in mammalian A549 cells demonstrate that these IONPs are biocompatible and can also produce significant T2/T2* contrast enhancement in IONPs-labeled cells. Furthermore, excitation-wavelength dependent photoluminescence was observed under one- and two-photon excitation. DISCUSSION The obtained results indicated that IONPs could be used for fluorescence label-free bioimaging at multiple wavelengths, which was proven by multiphoton imaging of IONPs internalization in A549 cancer cells.
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Affiliation(s)
| | | | - Rui Silva
- Molecular Imaging and Photonics, KU Leuven, Leuven, Belgium
- Engineering Department, Oporto University, Porto, Portugal
- Biomedical MRI, Department of Imaging and Pathology, KU Leuven, Leuven, Belgium
| | - Bram Carlier
- Biomedical MRI, Department of Imaging and Pathology, KU Leuven, Leuven, Belgium
| | - Olivier Deschaume
- Laboratory for Soft Matter and Biophysics, KU Leuven, Leuven, Belgium
| | - Carmen Bartic
- Laboratory for Soft Matter and Biophysics, KU Leuven, Leuven, Belgium
| | - Susana Rocha
- Molecular Imaging and Photonics, KU Leuven, Leuven, Belgium
| | - Sergey Basov
- Quantum Solid State Physics, KU Leuven, Leuven, Belgium
| | | | - Uwe Himmelreich
- Biomedical MRI, Department of Imaging and Pathology, KU Leuven, Leuven, Belgium
| | | | - Ana Zamora
- Molecular Imaging and Photonics, KU Leuven, Leuven, Belgium
- Biomedical MRI, Department of Imaging and Pathology, KU Leuven, Leuven, Belgium
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Zhong K, Yu W, de Coene Y, Yamada A, Krylychkina O, Jooken S, Deschaume O, Bartic C, Clays K. Dual photonic bandgap hollow sphere colloidal photonic crystals for real-time fluorescence enhancement in living cells. Biosens Bioelectron 2021; 194:113577. [PMID: 34481238 DOI: 10.1016/j.bios.2021.113577] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2021] [Revised: 07/30/2021] [Accepted: 08/19/2021] [Indexed: 10/20/2022]
Abstract
To overcome the problems of refractive index matching and increased disorder when working with traditional heterostructure colloidal photonic crystals (CPCs) with dual or multiple photonic bandgaps (PBGs) for fluorescence enhancement in water, we propose the use of a chemical heterostructure in hollow sphere CPCs (HSCPCs). A partial chemical modification of the HSCPC creates a large contrast in wettability to induce the heterostructure, while the hollow spheres increase the refractive index difference when used in aqueous environment. With the platform, fluorescence enhancement reaches around 160 times in solution, and 72 times (signal-to-background ratio ~7 times) in cells during proof-of-concept live cardiomyocyte contractility experiments. Such photonic platform can be further exploited for chemical sensing, bioassays, and environmental monitoring. Moreover, the introduction of chemical heterostructures provides new design principles for functionalized photonic devices.
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Affiliation(s)
- Kuo Zhong
- Laboratory for Molecular Electronics and Photonics, KU Leuven, Celestijnenlaan 200D, 3001, Leuven, Belgium.
| | - Wei Yu
- Laboratory of Soft Matter and Biophysics, KU Leuven, Celestijnenlaan 200D, 3001, Leuven, Belgium
| | - Yovan de Coene
- Laboratory for Molecular Electronics and Photonics, KU Leuven, Celestijnenlaan 200D, 3001, Leuven, Belgium
| | - Atsushi Yamada
- Center for Computational Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki, 305-8577, Japan
| | | | - Stijn Jooken
- Laboratory of Soft Matter and Biophysics, KU Leuven, Celestijnenlaan 200D, 3001, Leuven, Belgium
| | - Olivier Deschaume
- Laboratory of Soft Matter and Biophysics, KU Leuven, Celestijnenlaan 200D, 3001, Leuven, Belgium
| | - Carmen Bartic
- Laboratory of Soft Matter and Biophysics, KU Leuven, Celestijnenlaan 200D, 3001, Leuven, Belgium
| | - Koen Clays
- Laboratory for Molecular Electronics and Photonics, KU Leuven, Celestijnenlaan 200D, 3001, Leuven, Belgium.
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Van Zundert I, Bravo M, Deschaume O, Cybulski P, Bartic C, Hofkens J, Uji-i H, Fortuni B, Rocha S. Versatile and Robust Method for Antibody Conjugation to Nanoparticles with High Targeting Efficiency. Pharmaceutics 2021; 13:2153. [PMID: 34959436 PMCID: PMC8703776 DOI: 10.3390/pharmaceutics13122153] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2021] [Revised: 12/07/2021] [Accepted: 12/08/2021] [Indexed: 02/07/2023] Open
Abstract
The application of antibodies in nanomedicine is now standard practice in research since it represents an innovative approach to deliver chemotherapy agents selectively to tumors. The variety of targets or markers that are overexpressed in different types of cancers results in a high demand for antibody conjugated-nanoparticles, which are versatile and easily customizable. Considering up-scaling, the synthesis of antibody-conjugated nanoparticles should be simple and highly reproducible. Here, we developed a facile coating strategy to produce antibody-conjugated nanoparticles using 'click chemistry' and further evaluated their selectivity towards cancer cells expressing different markers. Our approach was consistently repeated for the conjugation of antibodies against CD44 and EGFR, which are prominent cancer cell markers. The functionalized particles presented excellent cell specificity towards CD44 and EGFR overexpressing cells, respectively. Our results indicated that the developed coating method is reproducible, versatile, and non-toxic, and can be used for particle functionalization with different antibodies. This grafting strategy can be applied to a wide range of nanoparticles and will contribute to the development of future targeted drug delivery systems.
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Affiliation(s)
- Indra Van Zundert
- Molecular Imaging and Photonics, Department of Chemistry, KU Leuven, Celestijnenlaan 200F, 3001 Heverlee, Belgium; (I.V.Z.); (M.B.); (P.C.); (J.H.); (H.U.-i.)
| | - Maria Bravo
- Molecular Imaging and Photonics, Department of Chemistry, KU Leuven, Celestijnenlaan 200F, 3001 Heverlee, Belgium; (I.V.Z.); (M.B.); (P.C.); (J.H.); (H.U.-i.)
| | - Olivier Deschaume
- Soft-Matter Physics and Biophysics, Department of Physics and Astronomy, KU Leuven, Celestijnenlaan 200D, Box 2416, 3001 Heverlee, Belgium; (O.D.); (C.B.)
| | - Pierre Cybulski
- Molecular Imaging and Photonics, Department of Chemistry, KU Leuven, Celestijnenlaan 200F, 3001 Heverlee, Belgium; (I.V.Z.); (M.B.); (P.C.); (J.H.); (H.U.-i.)
| | - Carmen Bartic
- Soft-Matter Physics and Biophysics, Department of Physics and Astronomy, KU Leuven, Celestijnenlaan 200D, Box 2416, 3001 Heverlee, Belgium; (O.D.); (C.B.)
| | - Johan Hofkens
- Molecular Imaging and Photonics, Department of Chemistry, KU Leuven, Celestijnenlaan 200F, 3001 Heverlee, Belgium; (I.V.Z.); (M.B.); (P.C.); (J.H.); (H.U.-i.)
| | - Hiroshi Uji-i
- Molecular Imaging and Photonics, Department of Chemistry, KU Leuven, Celestijnenlaan 200F, 3001 Heverlee, Belgium; (I.V.Z.); (M.B.); (P.C.); (J.H.); (H.U.-i.)
- Research Institute for Electronic Science (RIES), Hokkaido University, N20W10, Kita Ward, Sapporo 001-0020, Japan
| | - Beatrice Fortuni
- Molecular Imaging and Photonics, Department of Chemistry, KU Leuven, Celestijnenlaan 200F, 3001 Heverlee, Belgium; (I.V.Z.); (M.B.); (P.C.); (J.H.); (H.U.-i.)
| | - Susana Rocha
- Molecular Imaging and Photonics, Department of Chemistry, KU Leuven, Celestijnenlaan 200F, 3001 Heverlee, Belgium; (I.V.Z.); (M.B.); (P.C.); (J.H.); (H.U.-i.)
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10
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Abrego CJG, Dedroog L, Deschaume O, Wellens J, Vananroye A, Lettinga MP, Patterson J, Bartic C. Multiscale Characterization of the Mechanical Properties of Fibrin and Polyethylene Glycol (PEG) Hydrogels for Tissue Engineering Applications. MACROMOL CHEM PHYS 2021. [DOI: 10.1002/macp.202100366] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Christian Jose Garcia Abrego
- Department of Physics and Astronomy Soft Matter and Biophysics Unit KU Leuven, Celestijnenlaan 200D‐ box 2416, 3001 Leuven Belgium
- Department of Materials Engineering KU Leuven, Kasteelpark Arenberg 44 ‐ box 2430, 3001 Leuven Belgium
| | - Lens Dedroog
- Department of Physics and Astronomy Soft Matter and Biophysics Unit KU Leuven, Celestijnenlaan 200D‐ box 2416, 3001 Leuven Belgium
| | - Olivier Deschaume
- Department of Physics and Astronomy Soft Matter and Biophysics Unit KU Leuven, Celestijnenlaan 200D‐ box 2416, 3001 Leuven Belgium
| | - Jolan Wellens
- Department of Physics and Astronomy Soft Matter and Biophysics Unit KU Leuven, Celestijnenlaan 200D‐ box 2416, 3001 Leuven Belgium
| | - Anja Vananroye
- Department of Chemical Engineering Soft Matter, Rheology and Technology Division KU Leuven, Celestijnenlaan 200J‐ box 2424, 3001 Leuven Belgium
| | - Minne Paul Lettinga
- Department of Physics and Astronomy Soft Matter and Biophysics Unit KU Leuven, Celestijnenlaan 200D‐ box 2416, 3001 Leuven Belgium
| | - Jennifer Patterson
- Biomaterials and Regenerative Medicine Group, IMDEA Materials Institute C/Eric Kandel, 2 Getafe Madrid 28906 Spain
| | - Carmen Bartic
- Department of Physics and Astronomy Soft Matter and Biophysics Unit KU Leuven, Celestijnenlaan 200D‐ box 2416, 3001 Leuven Belgium
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11
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Abakumov S, Deschaume O, Bartic C, Lang C, Korculanin O, Dhont JKG, Lettinga MP. Uncovering Log Jamming in Semidilute Suspensions of Quasi-Ideal Rods. Macromolecules 2021. [DOI: 10.1021/acs.macromol.1c00876] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Affiliation(s)
- Sergey Abakumov
- Laboratory for Molecular Imaging and Photonics, KU Leuven, B-3001 Leuven, Belgium
| | - Olivier Deschaume
- Laboratory for Soft Matter and Biophysics, KU Leuven, B-3001 Leuven, Belgium
| | - Carmen Bartic
- Laboratory for Soft Matter and Biophysics, KU Leuven, B-3001 Leuven, Belgium
| | - Christian Lang
- JCNS-4, Forschungzentrum Jülich, DE 85748 Jülich, Germany
| | | | | | - Minne Paul Lettinga
- Laboratory for Soft Matter and Biophysics, KU Leuven, B-3001 Leuven, Belgium
- IBI-4, Forschungzentrum Jülich, DE 52425 Jülich, Germany
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12
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Blockx J, Verfaillie A, Deschaume O, Bartic C, Muylaert K, Thielemans W. Glycine betaine grafted nanocellulose as an effective and bio-based cationic nanocellulose flocculant for wastewater treatment and microalgal harvesting. Nanoscale Adv 2021; 3:4133-4144. [PMID: 36132828 PMCID: PMC9417620 DOI: 10.1039/d1na00102g] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/06/2021] [Accepted: 05/11/2021] [Indexed: 06/02/2023]
Abstract
Flocculation is a widely used technology in industry including for wastewater treatment and microalgae harvesting. To increase the sustainability of wastewater treatment, and to avoid contamination of the harvested microalgal biomass, there is a need for bio-based flocculants to replace synthetic polymer flocculants or metal salt coagulants. We developed the first cellulose nanocrystalline flocculant with a grafted cationic point charge, i.e. glycine betaine (i.e. N,N,N-trimethylglycine) grafted cellulose nanocrystals (CNCs) effective for the flocculation of kaolin (a model system for wastewater treatment), the freshwater microalgae Chlorella vulgaris, and the marine microalgae Nannochloropsis oculata. We successfully grafted glycine betaine onto CNCs using a one-pot reaction using a tosyl chloride activated esterification reaction with a degree of substitution ranging from 0.078 ± 0.003 to 0.152 ± 0.002. The degree of substitution is controlled by the reaction conditions. Flocculation of kaolin (0.5 g L-1) required a dose of 2 mg L-1, a comparable dose to commercial polyacrylamide-based flocculants. Flocculation was also successful for freshwater as well as marine microalgae (biomass concentration about 300 mg L-1 dry matter), although the flocculation efficiency of the latter remained below 80%. The dose to induce flocculation (DS = 0.152 ± 0.002) was 20 mg L-1 for the freshwater Chlorella vulgaris and 46 mg L-1 for the marine Nannochloropsis oculata, comparable to other bio-based flocculants such as chitosan or TanFloc.
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Affiliation(s)
- Jonas Blockx
- Sustainable Materials Laboratory, Department of Chemical Engineering, KU Leuven, Campus Kulak Kortrijk Etienne Sabbelaan 53 box 7659 8500 Kortrijk Belgium
- Laboratory for Aquatic Biology, KU Leuven, Campus Kulak Kortrijk Etienne Sabbelaan 53 box 7659 8500 Kortrijk Belgium
| | - An Verfaillie
- Sustainable Materials Laboratory, Department of Chemical Engineering, KU Leuven, Campus Kulak Kortrijk Etienne Sabbelaan 53 box 7659 8500 Kortrijk Belgium
- Laboratory for Aquatic Biology, KU Leuven, Campus Kulak Kortrijk Etienne Sabbelaan 53 box 7659 8500 Kortrijk Belgium
| | - Olivier Deschaume
- Soft Matter and Biophysics Unit, Department of Physics and Astronomy, KU Leuven Celestijnenlaan 200 D 3001 Leuven Belgium
| | - Carmen Bartic
- Soft Matter and Biophysics Unit, Department of Physics and Astronomy, KU Leuven Celestijnenlaan 200 D 3001 Leuven Belgium
| | - Koenraad Muylaert
- Laboratory for Aquatic Biology, KU Leuven, Campus Kulak Kortrijk Etienne Sabbelaan 53 box 7659 8500 Kortrijk Belgium
| | - Wim Thielemans
- Sustainable Materials Laboratory, Department of Chemical Engineering, KU Leuven, Campus Kulak Kortrijk Etienne Sabbelaan 53 box 7659 8500 Kortrijk Belgium
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13
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Vertommen S, Deschaume O, Bartic C, De Winter J, Gerbaux P, Verbiest T, Koeckelberghs G. Effect of poly(thiophene)s topology on their third-order nonlinear optical response. POLYMER 2021. [DOI: 10.1016/j.polymer.2021.123630] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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14
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Moris M, Van Den Eede MP, Koeckelberghs G, Deschaume O, Bartic C, Clays K, Van Cleuvenbergen S, Verbiest T. Solvent Role in the Self-Assembly of Poly(3-alkylthiophene): A Harmonic Light Scattering Study. Macromolecules 2021. [DOI: 10.1021/acs.macromol.0c02544] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Michèle Moris
- Department of Chemistry, Molecular Imaging and Photonics, KU Leuven, Celestijnenlaan 200D, 3001 Heverlee, Belgium
| | - Marie-Paule Van Den Eede
- Department of Chemistry, Polymer Chemistry and Materials, KU Leuven, Celestijnenlaan 200F, 3001 Heverlee, Belgium
| | - Guy Koeckelberghs
- Department of Chemistry, Polymer Chemistry and Materials, KU Leuven, Celestijnenlaan 200F, 3001 Heverlee, Belgium
| | - Olivier Deschaume
- Department of Physics and Astronomy, Soft-Matter Physics and Biophysics Section, KU Leuven, Celestijnenlaan 200D, 3001 Heverlee, Belgium
| | - Carmen Bartic
- Department of Physics and Astronomy, Soft-Matter Physics and Biophysics Section, KU Leuven, Celestijnenlaan 200D, 3001 Heverlee, Belgium
| | - Koen Clays
- Department of Chemistry, Molecular Imaging and Photonics, KU Leuven, Celestijnenlaan 200D, 3001 Heverlee, Belgium
| | - Stijn Van Cleuvenbergen
- Department of Chemistry, Physical Chemistry, KU Leuven−KULAK, Etienne Sabbelaan 53, 8500 Kortrijk, Belgium
| | - Thierry Verbiest
- Department of Chemistry, Molecular Imaging and Photonics, KU Leuven, Celestijnenlaan 200D, 3001 Heverlee, Belgium
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15
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Zamora A, Moris M, Silva R, Deschaume O, Bartic C, Parac-Vogt TN, Verbiest T. Visualization and characterization of metallo-aggregates using multi-photon microscopy. RSC Adv 2021; 11:657-661. [PMID: 35423665 PMCID: PMC8693374 DOI: 10.1039/d0ra07263j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2020] [Accepted: 12/17/2020] [Indexed: 11/26/2022] Open
Abstract
A simple and cost-effective method based on multi-photon microscopy is presented for the preliminary screening of the general morphology, size range and heterogeneity of Ir(iii) nano-aggregate formulations. Multi-photon microscopy can be an excellent complementary technique for the characterization of nano-aggregates containing metallic photosensitizers with multi-photon emission properties.![]()
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Affiliation(s)
- Ana Zamora
- Molecular Imaging and Photonics
- KU Leuven
- Belgium
| | | | - Rui Silva
- Molecular Imaging and Photonics
- KU Leuven
- Belgium
- Engineering Faculty of Oporto University
- Portugal (FEUP)
| | | | - Carmen Bartic
- Laboratory of Soft Matter and Biophysics
- KU Leuven
- Belgium
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Delabie J, De Winter J, Deschaume O, Bartic C, Gerbaux P, Verbiest T, Koeckelberghs G. Development of a Layered Hybrid Nanocomposite Material Using α,ω-Bifunctionalized Polythiophenes. Macromolecules 2020. [DOI: 10.1021/acs.macromol.0c01593] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Jonas Delabie
- Laboratory for Polymer Synthesis, KU Leuven, Celestijnenlaan 200F, Box 2404, B-3001 Heverlee, Belgium
| | - Julien De Winter
- Organic Synthesis and Mass Spectrometry Laboratory, Research Institute for Materials Science and Engineering, University of Mons—UMONS, 23 Place de Parc, B-7000 Mons, Belgium
| | - Olivier Deschaume
- Laboratory for Soft Matter and Biophysics, KU Leuven, Celestijnenlaan 200D, Box 2416, B-3001 Heverlee, Belgium
| | - Carmen Bartic
- Laboratory for Soft Matter and Biophysics, KU Leuven, Celestijnenlaan 200D, Box 2416, B-3001 Heverlee, Belgium
| | - Pascal Gerbaux
- Organic Synthesis and Mass Spectrometry Laboratory, Research Institute for Materials Science and Engineering, University of Mons—UMONS, 23 Place de Parc, B-7000 Mons, Belgium
| | - Thierry Verbiest
- Laboratory for Molecular Electronics and Photonics, KU Leuven, Celestijnenlaan 200D, Box 2425, B-3001 Heverlee, Belgium
| | - Guy Koeckelberghs
- Laboratory for Polymer Synthesis, KU Leuven, Celestijnenlaan 200F, Box 2404, B-3001 Heverlee, Belgium
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Moris M, Van Den Eede MP, Koeckelberghs G, Deschaume O, Bartic C, Clays K, Van Cleuvenbergen S, Verbiest T. Unraveling the Supramolecular Organization Mechanism of Chiral Star-Shaped Poly(3-alkylthiophene). Macromolecules 2020. [DOI: 10.1021/acs.macromol.0c01232] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Michèle Moris
- Department of Chemistry, Molecular Imaging and Photonics, KU Leuven, Celestijnenlaan 200D, 3001 Heverlee, Belgium
| | - Marie-Paule Van Den Eede
- Department of Chemistry, Polymer Chemistry and Materials, KU Leuven, Celestijnenlaan 200F, 3001 Heverlee, Belgium
| | - Guy Koeckelberghs
- Department of Chemistry, Polymer Chemistry and Materials, KU Leuven, Celestijnenlaan 200F, 3001 Heverlee, Belgium
| | - Olivier Deschaume
- Department of Physics and Astronomy, Soft-Matter Physics and Biophysics Section, KU Leuven, Celestijnenlaan 200D, 3001 Heverlee, Belgium
| | - Carmen Bartic
- Department of Physics and Astronomy, Soft-Matter Physics and Biophysics Section, KU Leuven, Celestijnenlaan 200D, 3001 Heverlee, Belgium
| | - Koen Clays
- Department of Chemistry, Polymer Chemistry and Materials, KU Leuven, Celestijnenlaan 200F, 3001 Heverlee, Belgium
| | - Stijn Van Cleuvenbergen
- Department of Chemistry, Physical Chemistry, KU Leuven-KULAK, Etienne Sabbelaan 53, 8500 Kortrijk, Belgium
| | - Thierry Verbiest
- Department of Chemistry, Molecular Imaging and Photonics, KU Leuven, Celestijnenlaan 200D, 3001 Heverlee, Belgium
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18
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Yongabi D, Jooken S, Givanoudi S, Khorshid M, Deschaume O, Bartic C, Losada-Pérez P, Wübbenhorst M, Wagner P. Ionic strength controls long-term cell-surface interactions - A QCM-D study of S. cerevisiae adhesion, retention and detachment. J Colloid Interface Sci 2020; 585:583-595. [PMID: 33127054 DOI: 10.1016/j.jcis.2020.10.038] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2020] [Revised: 10/09/2020] [Accepted: 10/11/2020] [Indexed: 01/18/2023]
Abstract
Understanding microbial adhesion and retention is crucial for controlling many processes, including biofilm formation, antimicrobial therapy as well as cell sorting and cell detection platforms. Cell detachment is inextricably linked to cell adhesion and retention and plays an important part in the mechanisms involved in these processes. Physico-chemical and biological forces play a crucial role in microbial adhesion interactions and altering the medium ionic strength offers a potential means for modulating these interactions. Real-time studies on the effect of ionic strength on microbial adhesion are often limited to short-term bacterial adhesion. Therefore, there is a need, not only for long-term bacterial adhesion studies, but also for similar studies focusing on eukaryotic microbes, such as yeast. Hereby, we monitored, in real-time, S. cerevisiae adhesion on gold and silica as examples of surfaces with different surface charge properties to disclose long-term adhesion, retention and detachment as a function of ionic strength using quartz crystal microbalance with dissipation monitoring. Our results show that short- and long-term cell adhesion levels in terms of mass-loading increase with increasing ionic strength, while cells dispersed in a medium of higher ionic strength experience longer retention and detachment times. The positive correlation between the cell zeta potential and ionic strength suggests that zeta potential plays a role on cell retention and detachment. These trends are similar for measurements on silica and gold, with shorter retention and detachment times for silica due to strong short-range repulsions originating from a high electron-donicity. Furthermore, the results are comparable with measurements in standard yeast culture medium, implying that the overall effect of ionic strength applies for cells in nutrient-rich and nutrient-deficient media.
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Affiliation(s)
- Derick Yongabi
- KU Leuven, Department of Physics and Astronomy, Laboratory for Soft Matter and Biophysics, Celestijnenlaan 200 D, B-3001 Leuven, Belgium.
| | - Stijn Jooken
- KU Leuven, Department of Physics and Astronomy, Laboratory for Soft Matter and Biophysics, Celestijnenlaan 200 D, B-3001 Leuven, Belgium
| | - Stella Givanoudi
- KU Leuven, Department of Physics and Astronomy, Laboratory for Soft Matter and Biophysics, Celestijnenlaan 200 D, B-3001 Leuven, Belgium
| | - Mehran Khorshid
- KU Leuven, Department of Physics and Astronomy, Laboratory for Soft Matter and Biophysics, Celestijnenlaan 200 D, B-3001 Leuven, Belgium
| | - Olivier Deschaume
- KU Leuven, Department of Physics and Astronomy, Laboratory for Soft Matter and Biophysics, Celestijnenlaan 200 D, B-3001 Leuven, Belgium
| | - Carmen Bartic
- KU Leuven, Department of Physics and Astronomy, Laboratory for Soft Matter and Biophysics, Celestijnenlaan 200 D, B-3001 Leuven, Belgium
| | - Patricia Losada-Pérez
- Université Libre de Bruxelles (ULB), Experimental Soft Matter and Thermal Physics Group, Campus La Plaine, CP223, Boulevard du Triomphe, 1050 Brussels, Belgium
| | - Michael Wübbenhorst
- KU Leuven, Department of Physics and Astronomy, Laboratory for Soft Matter and Biophysics, Celestijnenlaan 200 D, B-3001 Leuven, Belgium
| | - Patrick Wagner
- KU Leuven, Department of Physics and Astronomy, Laboratory for Soft Matter and Biophysics, Celestijnenlaan 200 D, B-3001 Leuven, Belgium
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Vertommen S, Battaglini E, Salatelli E, Deschaume O, Bartic C, Verbiest T, Koeckelberghs G. The Importance of Excellent π-π Interactions in Poly(thiophene)s To Reach a High Third-Order Nonlinear Optical Response. J Phys Chem B 2020; 124:9668-9679. [PMID: 33115240 DOI: 10.1021/acs.jpcb.0c07535] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Poly(thiophene)s have an inherently large third-order nonlinear optical (TONO) response, but applications are not straightforward due to unoptimized materials. Therefore, several structure-property relationships (molar mass, branching, regioregularity) are investigated to unravel which structural modifications give the highest TONO response. Poly(3-hexylthiophene) with different molar masses, poly[3-(2-ethylhexyl)thiophene] with different molar masses, and random copolymers with different degrees of regioregularity are synthesized and measured by UV-vis spectroscopy and the third harmonic scattering technique. Every structural modification that leads to an increase in π-π interactions in poly(thiophene)s leads to an increase in the TONO response of the material. Therefore, a material with a high molar mass, an unbranched alkyl side chain, and a high regioregularity degree is preferably tested as a promising TONO material.
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Affiliation(s)
- Stien Vertommen
- Department of Chemistry, Laboratory for Polymer Synthesis, KU Leuven, Celestijnenlaan 200F, box 2404, Heverlee, Leuven 3001, Belgium
| | - Elena Battaglini
- Department of Industrial Chemistry "Toso Montanari", University of Bologna, Viale del Risorgimento 4, Bologna 40136, Italy
| | - Elisabetta Salatelli
- Department of Industrial Chemistry "Toso Montanari", University of Bologna, Viale del Risorgimento 4, Bologna 40136, Italy
| | - Olivier Deschaume
- Department of Physics and Astronomy, Soft-Matter Physics and Biophysics section, KU Leuven, Celestijnenlaan 200D, box 2416, Heverlee, Leuven 3001, Belgium
| | - Carmen Bartic
- Department of Physics and Astronomy, Soft-Matter Physics and Biophysics section, KU Leuven, Celestijnenlaan 200D, box 2416, Heverlee, Leuven 3001, Belgium
| | - Thierry Verbiest
- Department of Chemistry, Molecular Imaging and Photonics, KU Leuven, Celestijnenlaan 200D, box 2425, Heverlee, Leuven 3001, Belgium
| | - Guy Koeckelberghs
- Department of Chemistry, Laboratory for Polymer Synthesis, KU Leuven, Celestijnenlaan 200F, box 2404, Heverlee, Leuven 3001, Belgium
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20
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Van Rie J, González-Rubio G, Kumar S, Schütz C, Kohlbrecher J, Vanroelen M, Van Gerven T, Deschaume O, Bartic C, Liz-Marzán LM, Salazar-Alvarez G, Thielemans W. SANS study of mixed cholesteric cellulose nanocrystal - gold nanorod suspensions. Chem Commun (Camb) 2020; 56:13001-13004. [PMID: 32996921 DOI: 10.1039/d0cc04845c] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Self-assembly of cellulose nanocrystals (CNCs) doped with anisotropic gold nanorods (AuNRs) was studied by small-angle neutron scattering. Correlation distances and structured domains were analysed to determine the influence of CNC and AuNR concentration on structuring. The transfer of the nematic structure of CNCs to AuNRs is explained in terms of an entropy-driven evolution from an isotropic to a cholesteric phase, with small nematic domains already present in the "isotropic" phase in equilibrium with the chiral nematic phase.
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Affiliation(s)
- Jonas Van Rie
- Sustainable Materials Lab, Department of Chemical Engineering, KU Leuven, Campus Kulak Kortrijk, Etienne Sabbelaan 53, Kortrijk 8500, Belgium.
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21
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Garcia-Abrego C, Zaunz S, Toprakhisar B, Subramani R, Deschaume O, Jooken S, Bajaj M, Ramon H, Verfaillie C, Bartic C, Patterson J. Towards Mimicking the Fetal Liver Niche: The Influence of Elasticity and Oxygen Tension on Hematopoietic Stem/Progenitor Cells Cultured in 3D Fibrin Hydrogels. Int J Mol Sci 2020; 21:ijms21176367. [PMID: 32887387 PMCID: PMC7504340 DOI: 10.3390/ijms21176367] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2020] [Revised: 08/24/2020] [Accepted: 08/28/2020] [Indexed: 12/18/2022] Open
Abstract
Hematopoietic stem/progenitor cells (HSPCs) are responsible for the generation of blood cells throughout life. It is believed that, in addition to soluble cytokines and niche cells, biophysical cues like elasticity and oxygen tension are responsible for the orchestration of stem cell fate. Although several studies have examined the effects of bone marrow (BM) niche elasticity on HSPC behavior, no study has yet investigated the effects of the elasticity of other niche sites like the fetal liver (FL), where HSPCs expand more extensively. In this study, we evaluated the effect of matrix stiffness values similar to those of the FL on BM-derived HSPC expansion. We first characterized the elastic modulus of murine FL tissue at embryonic day E14.5. Fibrin hydrogels with similar stiffness values as the FL (soft hydrogels) were compared with stiffer fibrin hydrogels (hard hydrogels) and with suspension culture. We evaluated the expansion of total nucleated cells (TNCs), Lin−/cKit+ cells, HSPCs (Lin−/Sca+/cKit+ (LSK) cells), and hematopoietic stem cells (HSCs: LSK- Signaling Lymphocyte Activated Molecule (LSK-SLAM) cells) when cultured in 5% O2 (hypoxia) or in normoxia. After 10 days, there was a significant expansion of TNCs and LSK cells in all culture conditions at both levels of oxygen tension. LSK cells expanded more in suspension culture than in both fibrin hydrogels, whereas TNCs expanded more in suspension culture and in soft hydrogels than in hard hydrogels, particularly in normoxia. The number of LSK-SLAM cells was maintained in suspension culture and in the soft hydrogels but not in the hard hydrogels. Our results indicate that both suspension culture and fibrin hydrogels allow for the expansion of HSPCs and more differentiated progeny whereas stiff environments may compromise LSK-SLAM cell expansion. This suggests that further research using softer hydrogels with stiffness values closer to the FL niche is warranted.
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Affiliation(s)
- Christian Garcia-Abrego
- Department of Materials Engineering, KU Leuven, 3001 Leuven, Belgium; (C.G.-A.); (B.T.)
- Department of Physics and Astronomy, KU Leuven, 3001 Leuven, Belgium; (O.D.); (S.J.); (C.B.)
| | - Samantha Zaunz
- Stem Cell Institute, KU Leuven, 3000 Leuven, Belgium; (S.Z.); (M.B.); (C.V.)
| | - Burak Toprakhisar
- Department of Materials Engineering, KU Leuven, 3001 Leuven, Belgium; (C.G.-A.); (B.T.)
- Stem Cell Institute, KU Leuven, 3000 Leuven, Belgium; (S.Z.); (M.B.); (C.V.)
| | - Ramesh Subramani
- Department of Biosystems, KU Leuven, 3001 Leuven, Belgium; (R.S.); (H.R.)
- Department of Food Processing Technology and Management, PSGR Krishnammal College for Women, Coimbatore 641004, India
| | - Olivier Deschaume
- Department of Physics and Astronomy, KU Leuven, 3001 Leuven, Belgium; (O.D.); (S.J.); (C.B.)
| | - Stijn Jooken
- Department of Physics and Astronomy, KU Leuven, 3001 Leuven, Belgium; (O.D.); (S.J.); (C.B.)
| | - Manmohan Bajaj
- Stem Cell Institute, KU Leuven, 3000 Leuven, Belgium; (S.Z.); (M.B.); (C.V.)
| | - Herman Ramon
- Department of Biosystems, KU Leuven, 3001 Leuven, Belgium; (R.S.); (H.R.)
| | | | - Carmen Bartic
- Department of Physics and Astronomy, KU Leuven, 3001 Leuven, Belgium; (O.D.); (S.J.); (C.B.)
| | - Jennifer Patterson
- Department of Materials Engineering, KU Leuven, 3001 Leuven, Belgium; (C.G.-A.); (B.T.)
- IMDEA Materials Institute, 28906 Madrid, Spain
- Correspondence:
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Yu W, Li Y, Jooken S, Deschaume O, Liu F, Wang S, Bartic C. Second-order optimized regularized structured illumination microscopy (sorSIM) for high-quality and rapid super resolution image reconstruction with low signal level. Opt Express 2020; 28:16708-16724. [PMID: 32549487 DOI: 10.1364/oe.390745] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/18/2020] [Accepted: 05/12/2020] [Indexed: 06/11/2023]
Abstract
Structured illumination microscopy (SIM) is a widely used super resolution imaging technique that can down-modulate a sample's high-frequency information into objective recordable frequencies to enhance the resolution below the diffraction limit. However, classical SIM image reconstruction methods often generate poor results under low illumination conditions, which are required for reducing photobleaching and phototoxicity in cell imaging experiments. Although denoising methods or auxiliary items improved SIM image reconstruction in low signal level situations, they still suffer from decreased reconstruction quality and significant background artifacts, inevitably limiting their practical applications. In order to improve the reconstruction quality, second-order optimized regularized SIM (sorSIM) is designed specifically for image reconstruction in low signal level situations. In sorSIM, a second-order regularization term is introduced to suppress noise effect, and the penalty factor in this term is selected to optimize the resolution enhancement and noise resistance. Compared to classical SIM image reconstruction algorithms as well as to those previously used in low illumination cases, the proposed sorSIM provides images with enhanced resolution and fewer background artifacts. Therefore, sorSIM can be a potential tool for high-quality and rapid super resolution imaging, especially for low signal images.
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23
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Yongabi D, Khorshid M, Gennaro A, Jooken S, Duwé S, Deschaume O, Losada-Pérez P, Dedecker P, Bartic C, Wübbenhorst M, Wagner P. QCM-D Study of Time-Resolved Cell Adhesion and Detachment: Effect of Surface Free Energy on Eukaryotes and Prokaryotes. ACS Appl Mater Interfaces 2020; 12:18258-18272. [PMID: 32223273 DOI: 10.1021/acsami.0c00353] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Cell-material interactions are crucial for many biomedical applications, including medical implants, tissue engineering, and biosensors. For implants, while the adhesion of eukaryotic host cells is desirable, bacterial adhesion often leads to infections. Surface free energy (SFE) is an important parameter that controls short- and long-term eukaryotic and prokaryotic cell adhesion. Understanding its effect at a fundamental level is essential for designing materials that minimize bacterial adhesion. Most cell adhesion studies for implants have focused on correlating surface wettability with mammalian cell adhesion and are restricted to short-term time scales. In this work, we used quartz crystal microbalance with dissipation monitoring (QCM-D) and electrical impedance analysis to characterize the adhesion and detachment of S. cerevisiae and E. coli, serving as model eukaryotic and prokaryotic cells within extended time scales. Measurements were performed on surfaces displaying different surface energies (Au, SiO2, and silanized SiO2). Our results demonstrate that tuning the surface free energy of materials is a useful strategy for selectively promoting eukaryotic cell adhesion and preventing bacterial adhesion. Specifically, we show that under flow and steady-state conditions and within time scales up to ∼10 h, a high SFE, especially its polar component, enhances S. cerevisiae adhesion and hinders E. coli adhesion. In the long term, however, both cells tend to detach, but less detachment occurs on surfaces with a high dispersive SFE contribution. The conclusions on S. cerevisiae are also valid for a second eukaryotic cell type, being the human embryonic kidney (HEK) cells on which we performed the same analysis for comparison. Furthermore, each cell adhesion phase is associated with unique cytoskeletal viscoelastic states, which are cell-type-specific and surface free energy-dependent and provide insights into the underlying adhesion mechanisms.
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Affiliation(s)
- Derick Yongabi
- Department of Physics and Astronomy, Laboratory for Soft Matter and Biophysics, KU Leuven, Celestijnenlaan 200 D, B-3001 Leuven, Belgium
| | - Mehran Khorshid
- Department of Physics and Astronomy, Laboratory for Soft Matter and Biophysics, KU Leuven, Celestijnenlaan 200 D, B-3001 Leuven, Belgium
| | - Alessia Gennaro
- Department of Physics and Astronomy, Laboratory for Soft Matter and Biophysics, KU Leuven, Celestijnenlaan 200 D, B-3001 Leuven, Belgium
| | - Stijn Jooken
- Department of Physics and Astronomy, Laboratory for Soft Matter and Biophysics, KU Leuven, Celestijnenlaan 200 D, B-3001 Leuven, Belgium
| | - Sam Duwé
- Department of Chemistry, Laboratory for Nanobiology, KU Leuven, Celestinenlaan 200 G, B-3001, Leuven, Belgium
| | - Olivier Deschaume
- Department of Physics and Astronomy, Laboratory for Soft Matter and Biophysics, KU Leuven, Celestijnenlaan 200 D, B-3001 Leuven, Belgium
| | - Patricia Losada-Pérez
- Experimental Soft Matter and Thermal Physics Group, Université Libre de Bruxelles (ULB), Campus La Plaine, CP223, Boulevard du Triomphe, 1050 Brussels, Belgium
| | - Peter Dedecker
- Department of Chemistry, Laboratory for Nanobiology, KU Leuven, Celestinenlaan 200 G, B-3001, Leuven, Belgium
| | - Carmen Bartic
- Department of Physics and Astronomy, Laboratory for Soft Matter and Biophysics, KU Leuven, Celestijnenlaan 200 D, B-3001 Leuven, Belgium
| | - Michael Wübbenhorst
- Department of Physics and Astronomy, Laboratory for Soft Matter and Biophysics, KU Leuven, Celestijnenlaan 200 D, B-3001 Leuven, Belgium
| | - Patrick Wagner
- Department of Physics and Astronomy, Laboratory for Soft Matter and Biophysics, KU Leuven, Celestijnenlaan 200 D, B-3001 Leuven, Belgium
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24
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Moris M, Van Den Eede MP, Koeckelberghs G, Deschaume O, Bartic C, Van Cleuvenbergen S, Clays K, Verbiest T. Harmonic light scattering study reveals structured clusters upon the supramolecular aggregation of regioregular poly(3-alkylthiophene). Commun Chem 2019. [DOI: 10.1038/s42004-019-0230-4] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
Abstract
Solubilized poly(3-alkylthiophene)s are known to self-assemble into well-ordered supramolecular aggregates upon lowering the solvent quality. This supramolecular organization largely determines the optical and electronic properties of these polymers. However, despite numerous studies the exact mechanism and kinetics of the aggregation process and the role of external stimuli are still poorly understood. Classical characterization techniques such as electronic spectroscopy, dynamic light scattering, and diffraction-based techniques have not been able to provide a full understanding. Here we use second-harmonic scattering (SHS) and third-harmonic scattering (THS) techniques to investigate this supramolecular aggregation mechanism. Our results indicate that the actual supramolecular aggregation is preceded by the formation of structured polymer-solvent clusters consistent with a nonclassical crystallization pathway.
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25
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Van Cleuvenbergen S, Smith ZJ, Deschaume O, Bartic C, Wachsmann Hogiu S, Verbiest T, van der Veen M. Morphology and structure of the metal–organic framework ZIF-8 during crystallisation measured by a new technique: dynamic angle-resolved second-harmonic scattering (AD-SHS). Acta Crystallogr A Found Adv 2019. [DOI: 10.1107/s2053273319088855] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/03/2023] Open
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26
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Cornelis P, Givanoudi S, Yongabi D, Iken H, Duwé S, Deschaume O, Robbens J, Dedecker P, Bartic C, Wübbenhorst M, Schöning MJ, Heyndrickx M, Wagner P. Sensitive and specific detection of E. coli using biomimetic receptors in combination with a modified heat-transfer method. Biosens Bioelectron 2019; 136:97-105. [DOI: 10.1016/j.bios.2019.04.026] [Citation(s) in RCA: 34] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2019] [Revised: 04/03/2019] [Accepted: 04/14/2019] [Indexed: 12/31/2022]
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27
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de Coene Y, Deschaume O, Zhang Y, Billen A, He J, Seré S, Knoppe S, Van Cleuvenbergen S, Verbiest T, Clays K, Ye J, Bartic C. Enhancement of Nonlinear Optical Scattering by Gold Nanoparticles through Aggregation-Induced Plasmon Coupling in the Near-Infrared. Chemphyschem 2019; 20:1765-1774. [PMID: 31020783 DOI: 10.1002/cphc.201900194] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2019] [Revised: 04/02/2019] [Indexed: 11/08/2022]
Abstract
Gold nanoparticles (AuNPs) are regarded as promising building blocks in functional nanomaterials for sensing, drug delivery and catalysis. One remarkable property of these particles is the localized surface plasmon resonance (LSPR), which gives rise to augmented optical properties through local field enhancement. LSPR also influences the nonlinear optical properties of metal NPs (MNPs) making them potentially interesting candidates for fast, high resolution nonlinear optical imaging. In this work we characterize and discuss the wavelength dependence of the hyper-Rayleigh scattering (HRS) behavior of spherical gold nanoparticles (GNP) and gold nanorods (GNR) in solution, from 850 nm up to 1300 nm, covering the near-infrared (NIR) window relevant for deep tissue imaging. The high-resolution spectral data allows discriminating between HRS and two photon photoluminescence contributions. Upon particle aggregation, we measured very large enhancements (ca. 104 ) of the HRS intensity in the NIR, which is explained by considering aggregation-induced plasmon coupling effects and local field enhancement. These results indicate that purposely designed coupled nanostructures could prove advantageous for nonlinear optical imaging and biosensing applications.
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Affiliation(s)
- Yovan de Coene
- Department of Physics and Astronomy, University of Leuven, Celestijnenlaan 200D, 3001, Leuven, Belgium
| | - Olivier Deschaume
- Department of Physics and Astronomy, University of Leuven, Celestijnenlaan 200D, 3001, Leuven, Belgium
| | - Yuqing Zhang
- School of Biomedical Engineering, Shanghai Jiao Tong University, 1954 Huashan Road, Shanghai, P.R. China, 200030
| | - Arne Billen
- Department of Chemistry, University of Leuven, Celestijnenlaan 200D, 3001, Leuven, Belgium
| | - Jing He
- School of Biomedical Engineering, Shanghai Jiao Tong University, 1954 Huashan Road, Shanghai, P.R. China, 200030
| | - Stephanie Seré
- Department of Physics and Astronomy, University of Leuven, Celestijnenlaan 200D, 3001, Leuven, Belgium
| | - Stefan Knoppe
- Institute for Physical Chemistry, University of Stuttgart, Pfaffenwaldring 55, 70569, Stuttgart, Germany
| | | | - Thierry Verbiest
- Department of Chemistry, University of Leuven, Celestijnenlaan 200D, 3001, Leuven, Belgium
| | - Koen Clays
- Department of Chemistry, University of Leuven, Celestijnenlaan 200D, 3001, Leuven, Belgium
| | - Jian Ye
- School of Biomedical Engineering, Shanghai Jiao Tong University, 1954 Huashan Road, Shanghai, P.R. China, 200030
| | - Carmen Bartic
- Department of Physics and Astronomy, University of Leuven, Celestijnenlaan 200D, 3001, Leuven, Belgium
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28
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Meng L, Deschaume O, Larbanoix L, Fron E, Bartic C, Laurent S, Van der Auweraer M, Glorieux C. Photoacoustic temperature imaging based on multi-wavelength excitation. Photoacoustics 2019; 13:33-45. [PMID: 30555785 PMCID: PMC6277227 DOI: 10.1016/j.pacs.2018.11.004] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/15/2018] [Revised: 10/29/2018] [Accepted: 11/15/2018] [Indexed: 05/04/2023]
Abstract
Building further upon the high spatial resolution offered by ultrasonic imaging and the high optical contrast yielded by laser excitation of photoacoustic imaging, and exploiting the temperature dependence of photoacoustic signal amplitudes, this paper addresses the question whether the rich information given by multispectral optoacoustic tomography (MSOT) allows to obtain 3D temperature images. Numerical simulations and experimental results are reported on agarose phantoms containing gold nanoparticles and the effects of shadowing, reconstruction flaws, etc. on the accuracy are determined.
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Affiliation(s)
- Lei Meng
- Soft Matter and Biophysics, Department of Physics and Astronomy, KU Leuven, Celestijnenlaan 200D - box 2416, 3001 Leuven, Belgium
| | - Olivier Deschaume
- Soft Matter and Biophysics, Department of Physics and Astronomy, KU Leuven, Celestijnenlaan 200D - box 2416, 3001 Leuven, Belgium
| | - Lionel Larbanoix
- Center for Microscopy and Molecular Imaging, Rue Adrienne Bolland 8, B-6041, Gosselies, Belgium
| | - Eduard Fron
- Molecular Imaging and Photonics, Department of Chemistry, KU Leuven, Celestijnenlaan 200F - box 2404, 3001 Leuven, Belgium
| | - Carmen Bartic
- Soft Matter and Biophysics, Department of Physics and Astronomy, KU Leuven, Celestijnenlaan 200D - box 2416, 3001 Leuven, Belgium
| | - Sophie Laurent
- Center for Microscopy and Molecular Imaging, Rue Adrienne Bolland 8, B-6041, Gosselies, Belgium
| | - Mark Van der Auweraer
- Molecular Imaging and Photonics, Department of Chemistry, KU Leuven, Celestijnenlaan 200F - box 2404, 3001 Leuven, Belgium
| | - Christ Glorieux
- Soft Matter and Biophysics, Department of Physics and Astronomy, KU Leuven, Celestijnenlaan 200D - box 2416, 3001 Leuven, Belgium
- Corresponding author.
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29
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Deschaume O, Breynaert E, Radhakrishnan S, Kerkhofs S, Haouas M, Adam de Beaumais S, Manzin V, Galey JB, Ramos-Stanbury L, Taulelle F, Martens JA, Bartic C. Impact of Amino Acids on the Isomerization of the Aluminum Tridecamer Al 13. Inorg Chem 2017; 56:12401-12409. [PMID: 28949129 DOI: 10.1021/acs.inorgchem.7b01699] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The stability of the Keggin polycation ε-Al13 is monitored by 27Al NMR and ferron colorimetric assay upon heating aluminum aqueous solutions containing different amino acids with overall positive, negative, or no charge at pH 4.2. A focus on the effect of the amino acids on the isomerization process from ε- to δ-Al13 is made, compared and discussed as a function of the type of organic additive. Amino acids such as glycine and β-alanine, with only one functional group interacting relatively strongly with aluminum polycations, accelerate isomerization in a concentration-dependent manner. The effect of this class of amino acids is also found increasing with the pKa of their carboxylic acid moiety, from a low impact from proline up to more than a 15-fold increased rate from the stronger binders such as glycine or β-alanine. Amino acids with relatively low C-terminal pKa, but bearing additional potential binding moieties such as free alcohol (hydroxyl group) moiety of serine or the amide of glutamine, speed the isomerization comparatively and even more than glycine or β-alanine, glutamine leading to the fastest rates observed so far. With aspartic and glutamic acids, changes in aluminum speciation are faster and significant even at room temperature but rather related to the reorganization toward slow reacting complexed oligomers than to the Al13 isomerization process. The linear relation between the apparent rate constant of isomerization and the additive concentration points to a first-order process with respect to the additives. Most likely, the dominant process is an accelerated ε-Al13 dissociation, increasing the probability of δ isomer formation.
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Affiliation(s)
- Olivier Deschaume
- Soft-Matter Physics and Biophysics Section, Department of Physics and Astronomy, KU Leuven , Celestijnenlaan 200 D - box 2416, B-3001 Heverlee, Belgium
| | - Eric Breynaert
- Centre for Surface Chemistry and Catalysis, KU Leuven , Celestijnenlaan 200 F - box 2461, B-3001 Heverlee, Belgium
| | - Sambhu Radhakrishnan
- Centre for Surface Chemistry and Catalysis, KU Leuven , Celestijnenlaan 200 F - box 2461, B-3001 Heverlee, Belgium
| | - Stef Kerkhofs
- Centre for Surface Chemistry and Catalysis, KU Leuven , Celestijnenlaan 200 F - box 2461, B-3001 Heverlee, Belgium
| | - Mohamed Haouas
- Lavoisier Institute of Versailles, University of Versailles Saint-Quentin en Yvelines, UMR CNRS 8180 , 45 Avenue des Etats-Unis, 78035 Versailles, France
| | | | - Valeria Manzin
- L'Oréal Recherche & Innovation , 1 avenue Eugène Schueller, 93600 Aulnay-sous-Bois, France
| | - Jean-Baptiste Galey
- L'Oréal Recherche & Innovation , 1 avenue Eugène Schueller, 93600 Aulnay-sous-Bois, France
| | - Laure Ramos-Stanbury
- L'Oréal Recherche & Innovation , 88 rue Paul Hochart, 94550 Chevilly-Larue, France
| | - Francis Taulelle
- Centre for Surface Chemistry and Catalysis, KU Leuven , Celestijnenlaan 200 F - box 2461, B-3001 Heverlee, Belgium
| | - Johan A Martens
- Centre for Surface Chemistry and Catalysis, KU Leuven , Celestijnenlaan 200 F - box 2461, B-3001 Heverlee, Belgium
| | - Carmen Bartic
- Soft-Matter Physics and Biophysics Section, Department of Physics and Astronomy, KU Leuven , Celestijnenlaan 200 D - box 2416, B-3001 Heverlee, Belgium
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30
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van Grinsven B, Eersels K, Akkermans O, Ellermann S, Kordek A, Peeters M, Deschaume O, Bartic C, Diliën H, Steen Redeker E, Wagner P, Cleij TJ. Label-Free Detection of Escherichia coli Based on Thermal Transport through Surface Imprinted Polymers. ACS Sens 2016. [DOI: 10.1021/acssensors.6b00435] [Citation(s) in RCA: 55] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- Bart van Grinsven
- Maastricht University, Maastricht Science Programme, P.O. Box 616, 6200 MD Maastricht, The Netherlands
| | - Kasper Eersels
- KU Leuven, Soft-Matter Physics and Biophysics
Section, Department of Physics and Astronomy, Celestijnenlaan 200 D, B-3001 Leuven, Belgium
| | - Onno Akkermans
- Maastricht University, Maastricht Science Programme, P.O. Box 616, 6200 MD Maastricht, The Netherlands
| | - Sophie Ellermann
- Maastricht University, Maastricht Science Programme, P.O. Box 616, 6200 MD Maastricht, The Netherlands
| | - Aleksandra Kordek
- Maastricht University, Maastricht Science Programme, P.O. Box 616, 6200 MD Maastricht, The Netherlands
| | - Marloes Peeters
- Faculty
of Science and Engineering, School of Science and the Environment,
Division of Chemistry and Environmental Science, Manchester Metropolitan University, Chester Street, Manchester M1 5GD, United Kingdom
| | - Olivier Deschaume
- KU Leuven, Soft-Matter Physics and Biophysics
Section, Department of Physics and Astronomy, Celestijnenlaan 200 D, B-3001 Leuven, Belgium
| | - Carmen Bartic
- KU Leuven, Soft-Matter Physics and Biophysics
Section, Department of Physics and Astronomy, Celestijnenlaan 200 D, B-3001 Leuven, Belgium
| | - Hanne Diliën
- Maastricht University, Maastricht Science Programme, P.O. Box 616, 6200 MD Maastricht, The Netherlands
| | - Erik Steen Redeker
- Maastricht University, Maastricht Science Programme, P.O. Box 616, 6200 MD Maastricht, The Netherlands
| | - Patrick Wagner
- KU Leuven, Soft-Matter Physics and Biophysics
Section, Department of Physics and Astronomy, Celestijnenlaan 200 D, B-3001 Leuven, Belgium
| | - Thomas J. Cleij
- Maastricht University, Maastricht Science Programme, P.O. Box 616, 6200 MD Maastricht, The Netherlands
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31
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Spaas C, Dok R, Deschaume O, De Roo B, Vervaele M, Seo JW, Bartic C, Hoet P, Van den Heuvel F, Nuyts S, Locquet JP. Dependence of Gold Nanoparticle Radiosensitization on Functionalizing Layer Thickness. Radiat Res 2016; 185:384-92. [PMID: 26950059 DOI: 10.1667/rr14207.1] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Gold nanoparticles functionalized with polyethylene glycol of different chain lengths are used to determine the influence of the capping layer thickness on the radiosensitizing effect of the particles. The size variations in organic coating, built up with polyethylene glycol polymers of molecular weight 1-20 kDa, allow an evaluation of the decrease in dose enhancement percentages caused by the gold nanoparticles at different radial distances from their surface. With localized eradication of malignant cells as a primary focus, radiosensitization is most effective after internalization in the nucleus. For this reason, we performed controlled radiation experiments, with doses up to 20 Gy and particle diameters in a range of 5-30 nm, and studied the relaxation pattern of supercoiled DNA. Subsequent gel electrophoresis of the suspensions was performed to evaluate the molecular damage and consecutively quantify the gold nanoparticle sensitization. In conclusion, on average up to 58.4% of the radiosensitizing efficiency was lost when the radial dimensions of the functionalizing layer were increased from 4.1 to 15.3 nm. These results serve as an experimental supplement for biophysical simulations and demonstrate the influence of an important parameter in the development of nanomaterials for targeted therapies in cancer radiotherapy.
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Affiliation(s)
| | | | | | | | | | | | | | - Peter Hoet
- d Public Health and Primary Care, Environment and Health, Katholieke Universiteit Leuven, Belgium; and
| | - Frank Van den Heuvel
- b Oncology.,e CRUK/MRC Institute for Radiation Oncology and Biology, University of Oxford, Oxford OX3 7DQ, United Kingdom
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32
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Vervaele M, De Roo B, Deschaume O, Rajala M, Guillon H, Sousa M, Bartic C, Van Haesendonck C, Seo JW, Locquet JP. Development of a new direct liquid injection system for nanoparticle deposition by chemical vapor deposition using nanoparticle solutions. Rev Sci Instrum 2016; 87:025101. [PMID: 26931885 DOI: 10.1063/1.4940937] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Nanoparticles of different materials are already in use for many applications. In some applications, these nanoparticles need to be deposited on a substrate in a fast and reproducible way. We have developed a new direct liquid injection system for nanoparticle deposition by chemical vapor deposition using a liquid nanoparticle precursor. The system was designed to deposit nanoparticles in a controlled and reproducible way by using two direct liquid injectors to deliver nanoparticles to the system. The nanoparticle solution is first evaporated and then the nanoparticles flow onto a substrate inside the vacuum chamber. To allow injection and evaporation of the liquid, a direct liquid injection and vaporization system are mounted on top of the process chamber. The deposition of the nanoparticles is controlled by parameters such as deposition temperature, partial pressure of the gases, and flow rate of the nanoparticle suspension. The concentration of the deposited nanoparticles can be varied simply by changing the flow rate and deposition time. We demonstrate the capabilities of this system using gold nanoparticles. The selected suspension flow rates were varied between 0.25 and 1 g/min. AFM analysis of the deposited samples showed that the aggregation of gold nanoparticles is well controlled by the flow and deposition parameters.
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Affiliation(s)
- Mattias Vervaele
- Department of Physics and Astronomy, KU Leuven, BE-3001 Leuven, Belgium
| | - Bert De Roo
- Department of Physics and Astronomy, KU Leuven, BE-3001 Leuven, Belgium
| | - Olivier Deschaume
- Department of Physics and Astronomy, KU Leuven, BE-3001 Leuven, Belgium
| | | | | | | | - Carmen Bartic
- Department of Physics and Astronomy, KU Leuven, BE-3001 Leuven, Belgium
| | | | - Jin Won Seo
- Department of Materials Engineering, KU Leuven, BE-3001 Leuven, Belgium
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33
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Debruyne D, Deschaume O, Coutiño-Gonzalez E, Locquet JP, Hofkens J, Van Bael MJ, Bartic C. The pH-dependent photoluminescence of colloidal CdSe/ZnS quantum dots with different organic coatings. Nanotechnology 2015; 26:255703. [PMID: 26031426 DOI: 10.1088/0957-4484/26/25/255703] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
The photoluminescence (PL) of colloidal quantum dots (QDs) is known to be sensitive to the solution pH. In this work we investigate the role played by the organic coating in determining the pH-dependent PL. We compare two types of CdSe/ZnS QDs equipped with different organic coatings, namely dihydrolipoic acid (DHLA)-capped QDs and phospholipid micelle-encapsulated QDs. Both QD types have their PL intensity quenched at acidic pH values, but they differ in terms of the reversibility of the quenching process. For DHLA-capped QDs, the quenching is nearly irreversible, with a small reversible component visible only on short time scales. For phospholipid micelle-encapsulated QDs the quenching is notably almost fully reversible. We suggest that the surface passivation by the organic ligands is reversible for the micelle-encapsulated QDs. Additionally, both coatings display pH-dependent spectral shifts. These shifts can be explained by a combination of irreversible processes, such as photo-oxidation and acid etching, and reversible charging of the QD surface, leading to the quantum-confined Stark effect (QCSE), the extent of each effect being coating-dependent. At high ionic strengths, the aggregation of QDs also leads to a spectral (red) shift, which is attributable to the QCSE and/or electronic energy transfer.
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Affiliation(s)
- David Debruyne
- Laboratory of Solid State Physics and Magnetism, KU Leuven, Celestijnenlaan 200D, BE-3001 Leuven, Belgium
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34
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Deschaume O, Magnin D, Cheng ZA, Douchamps C, Labbé P, Yunus S, Durrieu MC, Nysten B, Glinel K, Demoustier-Champagne S, Jonas AM. Comparison of the Density of Proteins and Peptides Grafted on Silane Layers and Polyelectrolyte Multilayers. Biomacromolecules 2014; 15:3706-16. [DOI: 10.1021/bm500996u] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Olivier Deschaume
- Bio and
Soft Matter, Institute
of Condensed Matter and Nanosciences, Université Catholique de Louvain, Croix du Sud 1 L7.04.02, 1348 Louvain-la-Neuve, Belgium
| | - Delphine Magnin
- Bio and
Soft Matter, Institute
of Condensed Matter and Nanosciences, Université Catholique de Louvain, Croix du Sud 1 L7.04.02, 1348 Louvain-la-Neuve, Belgium
| | - Zhe A. Cheng
- Bio and
Soft Matter, Institute
of Condensed Matter and Nanosciences, Université Catholique de Louvain, Croix du Sud 1 L7.04.02, 1348 Louvain-la-Neuve, Belgium
| | - Colette Douchamps
- Bio and
Soft Matter, Institute
of Condensed Matter and Nanosciences, Université Catholique de Louvain, Croix du Sud 1 L7.04.02, 1348 Louvain-la-Neuve, Belgium
| | - Pierre Labbé
- Bio and
Soft Matter, Institute
of Condensed Matter and Nanosciences, Université Catholique de Louvain, Croix du Sud 1 L7.04.02, 1348 Louvain-la-Neuve, Belgium
| | - Sami Yunus
- Bio and
Soft Matter, Institute
of Condensed Matter and Nanosciences, Université Catholique de Louvain, Croix du Sud 1 L7.04.02, 1348 Louvain-la-Neuve, Belgium
| | - Marie-Christine Durrieu
- Bio and
Soft Matter, Institute
of Condensed Matter and Nanosciences, Université Catholique de Louvain, Croix du Sud 1 L7.04.02, 1348 Louvain-la-Neuve, Belgium
| | - Bernard Nysten
- Bio and
Soft Matter, Institute
of Condensed Matter and Nanosciences, Université Catholique de Louvain, Croix du Sud 1 L7.04.02, 1348 Louvain-la-Neuve, Belgium
| | - Karine Glinel
- Bio and
Soft Matter, Institute
of Condensed Matter and Nanosciences, Université Catholique de Louvain, Croix du Sud 1 L7.04.02, 1348 Louvain-la-Neuve, Belgium
| | - Sophie Demoustier-Champagne
- Bio and
Soft Matter, Institute
of Condensed Matter and Nanosciences, Université Catholique de Louvain, Croix du Sud 1 L7.04.02, 1348 Louvain-la-Neuve, Belgium
| | - Alain M. Jonas
- Bio and
Soft Matter, Institute
of Condensed Matter and Nanosciences, Université Catholique de Louvain, Croix du Sud 1 L7.04.02, 1348 Louvain-la-Neuve, Belgium
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Peissker T, Deschaume O, Rand DR, Boyen HG, Conard T, Van Bael MJ, Bartic C. Selective protein immobilization onto gold nanoparticles deposited under vacuum on a protein-repellent self-assembled monolayer. Langmuir 2013; 29:15328-15335. [PMID: 24117376 DOI: 10.1021/la403016q] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
The immobilization of proteins on flat substrates plays an important role for a wide spectrum of applications in the fields of biology, medicine, and biochemistry, among others. An essential prerequisite for the use of proteins (e.g., in biosensors) is the conservation of their biological activity. Losses in activity upon protein immobilization can largely be attributed to a random attachment of the proteins to the surface. In this study, we present an approach for the immobilization of proteins onto a chemically heterogeneous surface, namely a surface consisting of protein-permissive and protein-repellent areas, which allows for significant reduction of random protein attachment. As protein-permissive, i.e., as protein-binding sites, ultra pure metallic nanoparticles are deposited under vacuum onto a protein-repellent PEG-silane polymer layer. Using complementary surface characterization techniques (atomic force microscopy, quartz crystal microbalance, and X-ray photoelectron spectroscopy) we demonstrate that the Au nanoparticles remain accessible for protein attachment without compromising the protein-repellency of the PEG-silane background. Moreover, we show that the amount of immobilized protein can be controlled by tuning the Au nanoparticle coverage. This method shows potential for applications requiring the control of protein immobilization down to the single molecule level.
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Affiliation(s)
- Tobias Peissker
- Laboratory of Solid State Physics and Magnetism, KU Leuven , Celestijnenlaan 200D, BE-3001 Leuven, Belgium
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Belton DJ, Deschaume O, Perry CC. An overview of the fundamentals of the chemistry of silica with relevance to biosilicification and technological advances. FEBS J 2012; 279:1710-20. [PMID: 22333209 DOI: 10.1111/j.1742-4658.2012.08531.x] [Citation(s) in RCA: 136] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Biomineral formation is widespread in nature, and occurs in bacteria, single-celled protists, plants, invertebrates, and vertebrates. Minerals formed in the biological environment often show unusual physical properties (e.g. strength, degree of hydration) and often have structures that exhibit order on many length scales. Biosilica, found in single-celled organisms through to higher plants and primitive animals (sponges), is formed from an environment that is undersaturated with respect to silicon, and under conditions of approximately neutral pH and relatively low temperatures of 4-40 °C compared to those used industrially. Formation of the mineral may occur intracellularly or extracellularly, and specific biochemical locations for mineral deposition that include lipids, proteins and carbohydrates are known. In most cases, the formation of the mineral phase is linked to cellular processes, an understanding of which could lead to the design of new materials for biomedical, optical and other applications. In this contribution, we describe the aqueous chemistry of silica, from uncondensed monomers through to colloidal particles and 3D structures, that is relevant to the environment from which the biomineral forms. We then describe the chemistry of silica formation from alkoxides such as tetraethoxysilane, as this and other silanes have been used to study the chemistry of silica formation using silicatein, and such precursors are often used in the preparation of silicas for technological applications. The focus of this article is on the methods, experimental and computational, by which the process of silica formation can be studied, with an emphasis on speciation.
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Affiliation(s)
- David J Belton
- Biomolecular and Materials Interface Research Laboratory, School of Science and Technology, Nottingham Trent University, Nottingham, UK
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Patwardhan SV, Emami FS, Berry RJ, Jones SE, Naik RR, Deschaume O, Heinz H, Perry CC. Chemistry of aqueous silica nanoparticle surfaces and the mechanism of selective peptide adsorption. J Am Chem Soc 2012; 134:6244-56. [PMID: 22435500 DOI: 10.1021/ja211307u] [Citation(s) in RCA: 237] [Impact Index Per Article: 19.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Control over selective recognition of biomolecules on inorganic nanoparticles is a major challenge for the synthesis of new catalysts, functional carriers for therapeutics, and assembly of renewable biobased materials. We found low sequence similarity among sequences of peptides strongly attracted to amorphous silica nanoparticles of various size (15-450 nm) using combinatorial phage display methods. Characterization of the surface by acid base titrations and zeta potential measurements revealed that the acidity of the silica particles increased with larger particle size, corresponding to between 5% and 20% ionization of silanol groups at pH 7. The wide range of surface ionization results in the attraction of increasingly basic peptides to increasingly acidic nanoparticles, along with major changes in the aqueous interfacial layer as seen in molecular dynamics simulation. We identified the mechanism of peptide adsorption using binding assays, zeta potential measurements, IR spectra, and molecular simulations of the purified peptides (without phage) in contact with uniformly sized silica particles. Positively charged peptides are strongly attracted to anionic silica surfaces by ion pairing of protonated N-termini, Lys side chains, and Arg side chains with negatively charged siloxide groups. Further, attraction of the peptides to the surface involves hydrogen bonds between polar groups in the peptide with silanol and siloxide groups on the silica surface, as well as ion-dipole, dipole-dipole, and van-der-Waals interactions. Electrostatic attraction between peptides and particle surfaces is supported by neutralization of zeta potentials, an inverse correlation between the required peptide concentration for measurable adsorption and the peptide pI, and proximity of cationic groups to the surface in the computation. The importance of hydrogen bonds and polar interactions is supported by adsorption of noncationic peptides containing Ser, His, and Asp residues, including the formation of multilayers. We also demonstrate tuning of interfacial interactions using mutant peptides with an excellent correlation between adsorption measurements, zeta potentials, computed adsorption energies, and the proposed binding mechanism. Follow-on questions about the relation between peptide adsorption on silica nanoparticles and mineralization of silica from peptide-stabilized precursors are raised.
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Affiliation(s)
- Siddharth V Patwardhan
- Interdisciplinary Biomedical Research Centre, School of Science and Technology, Nottingham Trent University, Clifton Lane, Nottingham NG11 8NS, UK
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Canabady-Rochelle LLS, Belton DJ, Deschaume O, Currie HA, Kaplan DL, Perry CC. Bioinspired silicification of silica-binding peptide-silk protein chimeras: comparison of chemically and genetically produced proteins. Biomacromolecules 2012; 13:683-90. [PMID: 22229696 DOI: 10.1021/bm201555c] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Novel protein chimeras constituted of "silk" and a silica-binding peptide (KSLSRHDHIHHH) were synthesized by genetic or chemical approaches and their influence on silica-silk based chimera composite formation evaluated. Genetic chimeras were constructed from 6 or 15 repeats of the 32 amino acid consensus sequence of Nephila clavipes spider silk ([SGRGGLGGQG AGAAAAAGGA GQGGYGGLGSQG](n)) to which one silica binding peptide was fused at the N terminus. For the chemical chimera, 28 equiv of the silica binding peptide were chemically coupled to natural Bombyx mori silk after modification of tyrosine groups by diazonium coupling and EDC/NHS activation of all acid groups. After silica formation under mild, biomaterial-compatible conditions, the effect of peptide addition on the properties of the silk and chimeric silk-silica composite materials was explored. The composite biomaterial properties could be related to the extent of silica condensation and to the higher number of silica binding sites in the chemical chimera as compared with the genetically derived variants. In all cases, the structure of the protein/chimera in solution dictated the type of composite structure that formed with the silica deposition process having little effect on the secondary structural composition of the silk-based materials. Similarly to our study of genetic silk based chimeras containing the R5 peptide (SSKKSGSYSGSKGSKRRIL), the role of the chimeras (genetic and chemical) used in the present study resided more in aggregation and scaffolding than in the catalysis of condensation. The variables of peptide identity, silk construct (number of consensus repeats or silk source), and approach to synthesis (genetic or chemical) can be used to "tune" the properties of the composite materials formed and is a general approach that can be used to prepare a range of materials for biomedical and sensor-based applications.
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Affiliation(s)
- Laetitia L S Canabady-Rochelle
- Biomolecular and Materials Interface Research Group, School of Science and Technology, Nottingham Trent University, Clifton lane, Nottingham NG11 8NS, United Kingdom
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Affiliation(s)
- Heather A. Currie
- Department of Biomedical Engineering, Tufts University, Medford, MA-02155 (USA)
| | - Olivier Deschaume
- School of Science and Technology, Nottingham Trent University, Nottingham, NG11 8NS (UK)
- Unité POLY, Université Catholique de Louvain, Boltzman A+2, Croix du Sud 1, B-1348, Louvain-La-Neuve (Belgium)
| | - Rajesh R. Naik
- Materials and Manufacturing Directorate, Air Force Research Laboratory, Wright- Patterson Air Force Base, Dayton, OH-45433 (USA)
| | - Carole C. Perry
- School of Science and Technology, Nottingham Trent University, Nottingham, NG11 8NS (UK)
| | - David L. Kaplan
- Department of Biomedical Engineering, Tufts University, Medford, MA-02155 (USA), ()
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Lakard B, Magnin D, Deschaume O, Vanlancker G, Glinel K, Demoustier-Champagne S, Nysten B, Jonas AM, Bertrand P, Yunus S. Urea potentiometric enzymatic biosensor based on charged biopolymers and electrodeposited polyaniline. Biosens Bioelectron 2011; 26:4139-45. [DOI: 10.1016/j.bios.2011.04.009] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2010] [Revised: 04/04/2011] [Accepted: 04/06/2011] [Indexed: 10/18/2022]
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Liang MK, Deschaume O, Patwardhan SV, Perry CC. Direct evidence of ZnO morphology modification via the selective adsorption of ZnO-binding peptides. ACTA ACUST UNITED AC 2011. [DOI: 10.1039/c0jm02124e] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Belton DJ, Deschaume O, Patwardhan SV, Perry CC. A solution study of silica condensation and speciation with relevance to in vitro investigations of biosilicification. J Phys Chem B 2010; 114:9947-55. [PMID: 20684617 DOI: 10.1021/jp101347q] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Requiring mild synthesis conditions and possessing a high level of organization and functionality, biosilicas constitute a source of wonder and inspiration for both materials scientists and biologists. In order to understand how such biomaterials are formed and to apply this knowledge to the generation of novel bioinspired materials, a detailed study of the materials, as formed under biologically relevant conditions, is required. In this contribution, data from a detailed study of silica speciation and condensation using a model bioinspired silica precursor (silicon catechol complex, SCC) is presented. The silicon complex quickly and controllably dissociates under neutral pH conditions to well-defined, metastable solutions of orthosilicic acid. The formation of silicomolybdous (blue) complexes was used to monitor and study different stages of silicic acid condensation. In parallel, the rates of silicomolybdic (yellow) complex formation, with mathematical modeling of the species present, was used to follow the solution speciation of polysilicic acids. The results obtained from the two assays correlate well. Monomeric silicic acid, trimeric silicic acids, and different classes of oligomeric polysilicic acids and silica nuclei can be identified and their periods of stability during the early stages of silica condensation measured. For experiments performed at a range of temperatures (273-323 K), an activation energy of 77 kJ.mol(-1) was obtained for the formation of trimers. The activation energies for the forward and reverse condensation reactions for addition of monomers to polysilicic acids (273-293 +/- 1 K) were 55.0 and 58.6 kJ.mol(-1), respectively. For temperatures above 293 K, these energies were reduced to 6.1 and 7.3 kJ.mol(-1), indicating a probable change in the prevailing condensation mechanism. The impact of pH on the rates of condensation were measured. There was a direct correlation between the apparent third-order rate constant for trimer formation and pH (4.7-6.9 +/- 0.1) while values for the reversible first-order rates reached a plateau at circumneutral pH. These different behaviors are discussed with reference to the generally accepted mechanism for silica condensation in which anionic silicate solution species are central to the condensation process. The results presented in this paper support the use of precursors such as silicon catecholate complexes in the study of biosilicification in vitro. Further detailed experimentation is needed to increase our understanding of specific biomolecule silica interactions that ultimately generate the complex, finely detailed siliceous structures we observe in the world around us.
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Affiliation(s)
- David J Belton
- Nottingham Trent University, School of Science and Technology, Clifton Lane, Nottingham NG11 8NS, United Kingdom
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Abstract
Interactions of aqueous solutions of aluminum polyoxocations (Al13-mers and Al30-mers) and aluminum hydroxide suspensions of varying particle sizes (26, 55, and 82 nm) with a model protein, bovine serum albumin (BSA), have been investigated using potentiometry, conductometry, viscometry, 27Al solution NMR, UV-vis spectroscopy, dynamic light scattering, zeta-potential measurements, thermogravimetry, X-ray diffraction, and scanning electron microscopy. Increasing amounts of BSA partially convert Al13-mers and, to a larger extent, Al30-mers into amorphous Al hydroxide without gel formation. At the same time, BSA molecules can form unstable aggregates in the Al polyoxocation solutions which redisperse easily upon standing. In the case of Al hydroxide sols, BSA addition causes substantial gelation, the extent of which is proportional to the amount of BSA added and inversely related to the Al hydroxide particle size. Upon freeze-drying or centrifugation of Al species-BSA solutions, an interesting sheetlike morphology with 150-200 nm wide nanoribbons is observed for pure Al hydroxide nanoparticles and for solutions of Al polyoxocations with the highest amount of BSA studied. On the basis of the combined solution, colloidal and solid-state characterization of model Al species-BSA systems, a qualitative model of possible interactions in the Al polyoxocation-BSA and Al hydroxide-BSA systems is proposed wherein core-shell hybrid nanoparticles are formed from protein "core" and Al polyoxocation "shell" or Al hydroxide "core" and protein "shell".
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Affiliation(s)
- Olivier Deschaume
- School of Biomedical and Natural Sciences, Nottingham Trent University, Clifton Lane, Clifton, Nottingham, The United Kingdom
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Shafran KL, Deschaume O, Perry CC. The static anion exchange method for generation of high purity aluminium polyoxocations and monodisperse aluminium hydroxide nanoparticles. ACTA ACUST UNITED AC 2005. [DOI: 10.1039/b505466d] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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