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Heine N, Doll-Nikutta K, Stein F, Jakobi J, Ingendoh-Tsakmakidis A, Rehbock C, Winkel A, Barcikowski S, Stiesch M. Anti-biofilm properties of laser-synthesized, ultrapure silver-gold-alloy nanoparticles against Staphylococcus aureus. Sci Rep 2024; 14:3405. [PMID: 38336925 PMCID: PMC10858226 DOI: 10.1038/s41598-024-53782-x] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2023] [Accepted: 02/05/2024] [Indexed: 02/12/2024] Open
Abstract
Staphylococcus aureus biofilm-associated infections are a common complication in modern medicine. Due to inherent resilience of biofilms to antibiotics and the rising number of antibiotic-resistant bacterial strains, new treatment options are required. For this purpose, ultrapure, spherical silver-gold-alloy nanoparticles with homogenous elemental distribution were synthesized by laser ablation in liquids and analyzed for their antibacterial activity on different stages of S. aureus biofilm formation as well as for different viability parameters. First, the effect of nanoparticles against planktonic bacteria was tested with metabolic activity measurements. Next, nanoparticles were incubated with differently matured S. aureus biofilms, which were then analyzed by metabolic activity measurements and three dimensional live/dead fluorescent staining to determine biofilm volume and membrane integrity. It could be shown that AgAu NPs exhibit antibacterial properties against planktonic bacteria but also against early-stage and even mature biofilms, with a complete diffusion through the biofilm matrix. Furthermore, AgAu NPs primarily targeted metabolic activity, to a smaller extend membrane integrity, but not the biofilm volume. Additional molecular analyses using qRT-PCR confirmed the influence on different metabolic pathways, like glycolysis, stress response and biofilm formation. As this shows clear similarities to the mechanism of pure silver ions, the results strengthen silver ions to be the major antibacterial agent of the synthesized nanoparticles. In summary, the results of this study provide initial evidence of promising anti-biofilm characteristics of silver-gold-alloy nanoparticles and support the importance of further translation-oriented analyses in the future.
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Affiliation(s)
- Nils Heine
- Department of Prosthetic Dentistry and Biomedical Materials Science, Hannover Medical School, Carl-Neuberg-Straße 1, 30625, Hannover, Germany.
- Lower Saxony Centre of Biomedical Engineering, Implant Research and Development, Stadtfelddamm 34, 30625, Hannover, Germany.
| | - Katharina Doll-Nikutta
- Department of Prosthetic Dentistry and Biomedical Materials Science, Hannover Medical School, Carl-Neuberg-Straße 1, 30625, Hannover, Germany
- Lower Saxony Centre of Biomedical Engineering, Implant Research and Development, Stadtfelddamm 34, 30625, Hannover, Germany
| | - Frederic Stein
- Technical Chemistry I, University of Duisburg Essen, Universitaetsstr. 7, 45141, Essen, Germany
| | - Jurij Jakobi
- Technical Chemistry I, University of Duisburg Essen, Universitaetsstr. 7, 45141, Essen, Germany
| | - Alexandra Ingendoh-Tsakmakidis
- Department of Prosthetic Dentistry and Biomedical Materials Science, Hannover Medical School, Carl-Neuberg-Straße 1, 30625, Hannover, Germany
- Lower Saxony Centre of Biomedical Engineering, Implant Research and Development, Stadtfelddamm 34, 30625, Hannover, Germany
| | - Christoph Rehbock
- Technical Chemistry I, University of Duisburg Essen, Universitaetsstr. 7, 45141, Essen, Germany
| | - Andreas Winkel
- Department of Prosthetic Dentistry and Biomedical Materials Science, Hannover Medical School, Carl-Neuberg-Straße 1, 30625, Hannover, Germany
- Lower Saxony Centre of Biomedical Engineering, Implant Research and Development, Stadtfelddamm 34, 30625, Hannover, Germany
| | - Stephan Barcikowski
- Technical Chemistry I, University of Duisburg Essen, Universitaetsstr. 7, 45141, Essen, Germany
| | - Meike Stiesch
- Department of Prosthetic Dentistry and Biomedical Materials Science, Hannover Medical School, Carl-Neuberg-Straße 1, 30625, Hannover, Germany.
- Lower Saxony Centre of Biomedical Engineering, Implant Research and Development, Stadtfelddamm 34, 30625, Hannover, Germany.
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Streich C, Stein F, Jakobi J, Ingendoh-Tsakmakidis A, Heine N, Rehbock C, Winkel A, Grade S, Kühnel M, Migunov V, Kovács A, Knura T, Stiesch M, Sures B, Barcikowski S. The Origin of the Intracellular Silver in Bacteria: A Comprehensive Study using Targeting Gold-Silver Alloy Nanoparticles. Adv Healthc Mater 2023; 12:e2302084. [PMID: 37661312 DOI: 10.1002/adhm.202302084] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2023] [Revised: 08/24/2023] [Indexed: 09/05/2023]
Abstract
The bactericidal effects of silver nanoparticles (Ag NPs) against infectious strains of multiresistant bacteria is a well-studied phenomenon, highly relevant for many researchers and clinicians battling bacterial infections. However, little is known about the uptake of the Ag NPs into the bacteria, the related uptake mechanisms, and how they are connected to antimicrobial activity. Even less information is available on AgAu alloy NPs uptake. In this work, the interactions between colloidal silver-gold alloy nanoparticles (AgAu NPs) and Staphylococcus aureus (S. aureus) using advanced electron microscopy methods are studied. The localization of the nanoparticles is monitored on the membrane and inside the bacterial cells and the elemental compositions of intra- and extracellular nanoparticle species. The findings reveal the formation of pure silver nanoparticles with diameters smaller than 10 nm inside the bacteria, even though those particles are not present in the original colloid. This finding is explained by a local RElease PEnetration Reduction (REPER) mechanism of silver cations emitted from the AgAu nanoparticles, emphasized by the localization of the AgAu nanoparticles on the bacterial membrane by aptamer targeting ligands. These findings can deepen the understanding of the antimicrobial effect of nanosilver, where the microbes are defusing the attacking silver ions via their reduction, and aid in the development of suitable therapeutic approaches.
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Affiliation(s)
- Carmen Streich
- University Duisburg-Essen, Technical Chemistry I, Universitaetsstr. 7, 45141, Essen, Germany
| | - Frederic Stein
- University Duisburg-Essen, Technical Chemistry I, Universitaetsstr. 7, 45141, Essen, Germany
| | - Jurij Jakobi
- University Duisburg-Essen, Technical Chemistry I, Universitaetsstr. 7, 45141, Essen, Germany
| | - Alexandra Ingendoh-Tsakmakidis
- Department of Prosthetic Dentistry and Biomedical Materials Science, Hannover Medical School, Carl-Neuberg-Straße 1, 30625, Hannover, Germany
| | - Nils Heine
- Department of Prosthetic Dentistry and Biomedical Materials Science, Hannover Medical School, Carl-Neuberg-Straße 1, 30625, Hannover, Germany
| | - Christoph Rehbock
- University Duisburg-Essen, Technical Chemistry I, Universitaetsstr. 7, 45141, Essen, Germany
| | - Andreas Winkel
- Department of Prosthetic Dentistry and Biomedical Materials Science, Hannover Medical School, Carl-Neuberg-Straße 1, 30625, Hannover, Germany
| | - Sebastian Grade
- Department of Prosthetic Dentistry and Biomedical Materials Science, Hannover Medical School, Carl-Neuberg-Straße 1, 30625, Hannover, Germany
| | - Mark Kühnel
- Department of Prosthetic Dentistry and Biomedical Materials Science, Hannover Medical School, Carl-Neuberg-Straße 1, 30625, Hannover, Germany
| | - Vadim Migunov
- Ernst Ruska-Centre for Microscopy and Spectroscopy with Electrons, Forschungszentrum Jülich, 52425, Jülich, Germany
| | - András Kovács
- Ernst Ruska-Centre for Microscopy and Spectroscopy with Electrons, Forschungszentrum Jülich, 52425, Jülich, Germany
| | - Thomas Knura
- University Duisburg-Essen, Aquatic Ecology, Universitaetsstr. 5, 45141, Essen, Germany
| | - Meike Stiesch
- Department of Prosthetic Dentistry and Biomedical Materials Science, Hannover Medical School, Carl-Neuberg-Straße 1, 30625, Hannover, Germany
| | - Bernd Sures
- University Duisburg-Essen, Aquatic Ecology, Universitaetsstr. 5, 45141, Essen, Germany
| | - Stephan Barcikowski
- University Duisburg-Essen, Technical Chemistry I, Universitaetsstr. 7, 45141, Essen, Germany
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3
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Johny J, van Halteren CER, Cakir FC, Zwiehoff S, Behrends C, Bäumer C, Timmermann B, Rauschenbach L, Tippelt S, Scheffler B, Schramm A, Rehbock C, Barcikowski S. Surface Chemistry and Specific Surface Area Rule the Efficiency of Gold Nanoparticle Sensitizers in Proton Therapy. Chemistry 2023; 29:e202301260. [PMID: 37334753 DOI: 10.1002/chem.202301260] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2023] [Revised: 06/13/2023] [Accepted: 06/13/2023] [Indexed: 06/20/2023]
Abstract
Gold nanoparticles (AuNPs) are currently the most studied radiosensitizers in proton therapy (PT) applicable for the treatment of solid tumors, where they amplify production of reactive oxygen species (ROS). However, it is underexplored how this amplification is correlated with the AuNPs' surface chemistry. To clarify this issue, we fabricated ligand-free AuNPs of different mean diameters by laser ablation in liquids (LAL) and laser fragmentation in liquids (LFL) and irradiated them with clinically relevant proton fields by using water phantoms. ROS generation was monitored by the fluorescent dye 7-OH-coumarin. Our findings reveal an enhancement of ROS production driven by I) increased total particle surface area, II) utilization of ligand-free AuNPs avoiding sodium citrate as a radical quencher ligands, and III) a higher density of structural defects generated by LFL synthesis, indicated by surface charge density. Based on these findings it may be concluded that the surface chemistry is a major and underexplored contributor to ROS generation and sensitizing effects of AuNPs in PT. We further highlight the applicability of AuNPs in vitro in human medulloblastoma cells.
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Affiliation(s)
- Jacob Johny
- Technical Chemistry I and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, 45141, Essen, Germany
| | - Charlotte E R van Halteren
- Technical Chemistry I and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, 45141, Essen, Germany
| | - Fatih-Can Cakir
- Technical Chemistry I and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, 45141, Essen, Germany
| | - Sandra Zwiehoff
- Technical Chemistry I and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, 45141, Essen, Germany
| | - Carina Behrends
- West German Proton Therapy Centre Essen (WPE), 45147, Essen, Germany
- West German Cancer Center (WTZ), 45147, Essen, Germany
- Department of Physics, TU Dortmund University, 44227, Dortmund, Germany
| | - Christian Bäumer
- West German Proton Therapy Centre Essen (WPE), 45147, Essen, Germany
- West German Cancer Center (WTZ), 45147, Essen, Germany
- Department of Physics, TU Dortmund University, 44227, Dortmund, Germany
- German Cancer Consortium (DKTK), 45147, Essen, Germany
| | - Beate Timmermann
- West German Proton Therapy Centre Essen (WPE), 45147, Essen, Germany
- West German Cancer Center (WTZ), 45147, Essen, Germany
- German Cancer Consortium (DKTK), 45147, Essen, Germany
- Department of Particle Therapy, University Hospital Essen, 45147, Essen, Germany
| | - Laurèl Rauschenbach
- West German Cancer Center (WTZ), 45147, Essen, Germany
- German Cancer Consortium (DKTK), 45147, Essen, Germany
- Department of Neurosurgery and Spine Surgery, University Hospital Essen, 45147, Essen, Germany
- DKFZ-Division Translational Neurooncology at the, West German Cancer Center (WTZ), University Hospital Essen, 45147, Essen, Germany
| | - Stephan Tippelt
- Pediatrics III, Pediatric Oncology and Hematology, University Hospital Essen, 45147, Essen, Germany
| | - Björn Scheffler
- West German Cancer Center (WTZ), 45147, Essen, Germany
- German Cancer Consortium (DKTK), 45147, Essen, Germany
- DKFZ-Division Translational Neurooncology at the, West German Cancer Center (WTZ), University Hospital Essen, 45147, Essen, Germany
| | - Alexander Schramm
- Laboratory of Molecular Oncology, Department of Medical Oncology, West German Cancer Center, University Hospital Essen, Essen, Germany
| | - Christoph Rehbock
- Technical Chemistry I and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, 45141, Essen, Germany
| | - Stephan Barcikowski
- Technical Chemistry I and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, 45141, Essen, Germany
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4
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Stein F, Kohsakowski S, Martinez-Hincapie R, Reichenberger S, Rehbock C, Colic V, Guay D, Barcikowski S. Disproportional surface segregation in ligand-free gold-silver alloy solid solution nanoparticles, and its implication for catalysis and biomedicine. Faraday Discuss 2023; 242:301-325. [PMID: 36222171 DOI: 10.1039/d2fd00092j] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Catalytic activity and toxicity of mixed-metal nanoparticles have been shown to correlate and are known to be dependent on surface composition. The surface chemistry of the fully inorganic, ligand-free silver-gold alloy nanoparticle molar fraction series, is highly interesting for applications in heterogeneous catalysis, which is determined by active surface sites which are also relevant for understanding their dissolution behavior in biomedically-relevant ion-release scenarios. However, such information has never been systematically obtained for colloidal nanoparticles without organic surface ligands and has to date, not been analyzed in a surface-normalized manner to exclude density effects. For this, we used detailed electrochemical measurements based on cyclic voltammetry to systematically analyze the redox chemistry of particle-surface-normalized gold-silver alloy nanoparticles with varying gold molar fractions. The study addressed a broad range of gold molar fractions (Ag90Au10, Ag80Au20, Ag70Au30, Ag50Au50, Ag40Au60, and Ag20Au80) as well as monometallic Ag and Au nanoparticle controls. Oxygen reduction reaction (ORR) measurements in O2 saturated 0.1 M KOH revealed a linear reduction of the overpotential with increasing gold content on the surface, probably attributed to the higher ORR activity of gold over silver, verified by monometallic Ag and Au controls. These findings were complemented by detailed XPS studies revealing an accumulation of the minor constituent of the alloy on the surface, e.g., silver surface enrichment in gold-rich particles. Furthermore, highly oxidized Ag surface site enrichment was detected after the ORR reaction, most pronounced in gold-rich alloys. Further, detailed CV studies at acidic pH, analyzing the position, onset potential, and peak integrals of silver oxidation and silver reduction peaks revealed particularly low reactivity and high chemical stability of the equimolar Au50Ag50 composition, a phenomenon attributed to the outstanding thermodynamic, entropically driven, stabilization arising at this composition.
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Affiliation(s)
- Frederic Stein
- Technical Chemistry I, Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, D-45141 Essen, Germany.
| | | | | | - Sven Reichenberger
- Technical Chemistry I, Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, D-45141 Essen, Germany.
| | - Christoph Rehbock
- Technical Chemistry I, Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, D-45141 Essen, Germany.
| | - Viktor Colic
- Max Planck Institute for Chemical Energy Conversion, D-45470 Mülheim an der Ruhr, Germany
| | - Daniel Guay
- Institut National de la Recherche Scientifique, INRS-Énergie, Matériaux et Télécommunications, Varennes, Québec, J3X 1P7, Canada
| | - Stephan Barcikowski
- Technical Chemistry I, Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, D-45141 Essen, Germany.
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Ramesh V, Stratmann N, Schaufler V, Angelov SD, Nordhorn ID, Heissler HE, Martínez-Hincapié R, Čolić V, Rehbock C, Schwabe K, Karst U, Krauss JK, Barcikowski S. Mechanical Stability of Nano-Coatings on Clinically Applicable Electrodes, Generated by Electrophoretic Deposition. Adv Healthc Mater 2022; 11:e2102637. [PMID: 36148583 DOI: 10.1002/adhm.202102637] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2021] [Revised: 09/08/2022] [Indexed: 01/28/2023]
Abstract
The mechanical stability of implant coatings is crucial for medical approval and transfer to clinical applications. Here, electrophoretic deposition (EPD) is a versatile coating technique, previously shown to cause significant post-surgery impedance reduction of brain stimulation platinum electrodes. However, the mechanical stability of the resulting coating has been rarely systematically investigated. In this work, pulsed-DC EPD of laser-generated platinum nanoparticles (PtNPs) on Pt-based, 3D neural electrodes is performed and the in vitro mechanical stability is examined using agarose gel, adhesive tape, and ultrasonication-based stress tests. EPD-generated coatings are highly stable inside simulated brain environments represented by agarose gel tests as well as after in vivo stimulation experiments. Electrochemical stability of the NP-modified surfaces is tested via cyclic voltammetry and that multiple scans may improve coating stability could be verified, indicated by higher signal stability following highly invasive adhesive tape stress tests. The brain sections post neural stimulation in rats are analyzed via laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS). Measurements reveal higher levels of Pt near the region stimulated with coated electrodes, in comparison to uncoated controls. Even though local concentrations in the vicinity of the implanted electrode are elevated, the total Pt mass found is below systemic toxicologically relevant concentrations.
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Affiliation(s)
- Vaijayanthi Ramesh
- Institute of Technical Chemistry I, University of Duisburg-Essen and Center for NanoIntegration Duisburg-Essen (CENIDE), 45141, Essen, Germany
| | - Nadine Stratmann
- Institute of Technical Chemistry I, University of Duisburg-Essen and Center for NanoIntegration Duisburg-Essen (CENIDE), 45141, Essen, Germany
| | - Viktor Schaufler
- Institute of Technical Chemistry I, University of Duisburg-Essen and Center for NanoIntegration Duisburg-Essen (CENIDE), 45141, Essen, Germany
| | - Svilen D Angelov
- Department of Neurosurgery, Hannover Medical School, 30625, Hannover, Germany
| | - Ilona D Nordhorn
- Institute of Inorganic and Analytical Chemistry, University of Münster, 48149, Münster, Germany
| | - Hans E Heissler
- Department of Neurosurgery, Hannover Medical School, 30625, Hannover, Germany
| | - Ricardo Martínez-Hincapié
- Electrochemistry for Energy Conversion, Max-Planck-Institute for Chemical Energy Conversion, 45470, Mulheim an der Ruhr, Germany
| | - Viktor Čolić
- Electrochemistry for Energy Conversion, Max-Planck-Institute for Chemical Energy Conversion, 45470, Mulheim an der Ruhr, Germany
| | - Christoph Rehbock
- Institute of Technical Chemistry I, University of Duisburg-Essen and Center for NanoIntegration Duisburg-Essen (CENIDE), 45141, Essen, Germany
| | - Kerstin Schwabe
- Department of Neurosurgery, Hannover Medical School, 30625, Hannover, Germany
| | - Uwe Karst
- Institute of Inorganic and Analytical Chemistry, University of Münster, 48149, Münster, Germany
| | - Joachim K Krauss
- Department of Neurosurgery, Hannover Medical School, 30625, Hannover, Germany
| | - Stephan Barcikowski
- Institute of Technical Chemistry I, University of Duisburg-Essen and Center for NanoIntegration Duisburg-Essen (CENIDE), 45141, Essen, Germany
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Johny J, van Halteren CER, Zwiehoff S, Behrends C, Bäumer C, Timmermann B, Rehbock C, Barcikowski S. Impact of Sterilization on the Colloidal Stability of Ligand-Free Gold Nanoparticles for Biomedical Applications. Langmuir 2022; 38:13030-13047. [PMID: 36260482 DOI: 10.1021/acs.langmuir.2c01557] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
Sterilization is a major prerequisite for the utilization of nanoparticle colloids in biomedicine, a process well examined for particles derived from chemical synthesis although highly underexplored for electrostatically stabilized ligand-free gold nanoparticles (AuNPs). Hence, in this work, we comprehensively examined and compared the physicochemical characteristics of laser-generated ligand-free colloidal AuNPs exposed to steam sterilization and sterile filtration as a function of particle size and mass concentration and obtained physicochemical insight into particle growth processes. These particles exhibit long-term colloidal stability (up to 3 months) derived from electrostatic stabilization without using any ligands or surfactants. We show that particle growth attributed to cluster-based ripening occurs in smaller AuNPs (∼5 nm) following autoclaving, while larger particles (∼10 and ∼30 nm) remain stable. Sterile filtration, as an alternative effective sterilizing approach, has no substantial impact on the colloidal stability of AuNPs, regardless of particle size, although a mass loss of 5-10% is observed. Finally, we evaluated the impact of the sterilization procedures on potential particle functionality in proton therapy, using the formation of reactive oxygen species (ROS) as a readout. In particular, 5 nm AuNPs exhibit a significant loss in activity upon autoclaving, probably dedicated to specific surface area reduction and surface restructuring during particle growth. The filtered analog enhanced the ROS release by up to a factor of ∼2.0, at 30 ppm gold concentration. Our findings highlight the need for carefully adapting the sterilization procedure of ligand-free NPs to the desired biomedical application with special emphasis on particle size and concentration.
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Affiliation(s)
- Jacob Johny
- Technical Chemistry I and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, 45141 Essen, Germany
| | - Charlotte E R van Halteren
- Technical Chemistry I and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, 45141 Essen, Germany
| | - Sandra Zwiehoff
- Technical Chemistry I and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, 45141 Essen, Germany
| | - Carina Behrends
- West German Cancer Centre (WTZ), University Hospital Essen, 45147 Essen, Germany
- Department of Physics, TU Dortmund University, 44227 Dortmund, Germany
- West German Proton Therapy Centre Essen (WPE), 45147 Essen, Germany
| | - Christian Bäumer
- West German Cancer Centre (WTZ), University Hospital Essen, 45147 Essen, Germany
- Department of Physics, TU Dortmund University, 44227 Dortmund, Germany
- West German Proton Therapy Centre Essen (WPE), 45147 Essen, Germany
- German Cancer Consortium (DKTK), 69120 Heidelberg, Germany
| | - Beate Timmermann
- West German Cancer Centre (WTZ), University Hospital Essen, 45147 Essen, Germany
- West German Proton Therapy Centre Essen (WPE), 45147 Essen, Germany
- German Cancer Consortium (DKTK), 69120 Heidelberg, Germany
- Department of Particle Therapy, University Hospital Essen, 45147 Essen, Germany
- Faculty of Medicine, University Hospital Essen, 45147 Essen, Germany
| | - Christoph Rehbock
- Technical Chemistry I and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, 45141 Essen, Germany
| | - Stephan Barcikowski
- Technical Chemistry I and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, 45141 Essen, Germany
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7
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Behrends C, Bäcker CM, Schilling I, Zwiehoff S, Weingarten J, Kröninger K, Rehbock C, Barcikowski S, Wulff J, Bäumer C, Timmermann B. The radiosensitizing effect of platinum nanoparticles in proton irradiations is not caused by an enhanced proton energy deposition at the macroscopic scale. Phys Med Biol 2022; 67. [DOI: 10.1088/1361-6560/ac80e6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2022] [Accepted: 07/13/2022] [Indexed: 11/12/2022]
Abstract
Abstract
Objective. Due to the radiosensitizing effect of biocompatible noble metal nanoparticles (NPs), their administration is considered to potentially increase tumor control in radiotherapy. The underlying physical, chemical and biological mechanisms of the NPs’ radiosensitivity especially when interacting with proton radiation is not conclusive. In the following work, the energy deposition of protons in matter containing platinum nanoparticles (PtNPs) is experimentally investigated. Approach. Surfactant-free monomodal PtNPs with a mean diameter of (40 ± 10) nm and a concentration of 300 μg ml−1, demonstrably leading to a substantial production of reactive oxygen species (ROS), were homogeneously dispersed into cubic gelatin samples serving as tissue-like phantoms. Gelatin samples without PtNPs were used as control. The samples’ dimensions and contrast of the PtNPs were verified in a clinical computed tomography scanner. Fields from a clinical proton machine were used for depth dose and stopping power measurements downstream of both samples types. These experiments were performed with a variety of detectors at a pencil beam scanning beam line as well as a passive beam line with proton energies from about 56–200 MeV. Main results. The samples’ water equivalent ratios in terms of proton stopping as well as the mean proton energy deposition downstream of the samples with ROS-producing PtNPs compared to the samples without PtNPs showed no differences within the experimental uncertainties of about 2%. Significance. This study serves as experimental proof that the radiosensitizing effect of biocompatible PtNPs is not due to a macroscopically increased proton energy deposition, but is more likely caused by a catalytic effect of the PtNPs. Thus, these experiments provide a contribution to the highly discussed radiobiological question of the proton therapy efficiency with noble metal NPs and facilitate initial evidence that the dose calculation in treatment planning is straightforward and not affected by the presence of sensitizing PtNPs.
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8
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Li Y, Ramesh V, Bider F, Bradshaw N, Rehbock C, Boccaccini AR, Barcikowski S. Co-doping of iron and copper ions in nanosized bioactive glass by reactive laser fragmentation in liquids. J Biomed Mater Res A 2022; 110:1537-1550. [PMID: 35437923 DOI: 10.1002/jbm.a.37393] [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: 12/15/2021] [Revised: 03/02/2022] [Accepted: 03/22/2022] [Indexed: 11/10/2022]
Abstract
Bioactive glass (BG) is a frequently used biomaterial applicable in bone tissue engineering and known to be particularly effective when applied in nanoscopic dimensions. In this work, we employed the scalable reactive laser fragmentation in liquids method to produce nanosized 45S5 BG in the presence of light-absorbing Fe and Cu ions. Here, the function of the ions was twofold: (i) increasing the light absorption and thus causing a significant increase in laser fragmentation efficiency by a factor of 100 and (ii) doping the BG with bioactive metal ions up to 4 wt%. Our findings reveal an effective downsizing of the BG from micrometer-sized educts into nanoparticles having average diameters of <50 nm. This goes along with successful element-specific incorporation of the metal ions into the BG, inducing co-doping of Fe and Cu ions as verified by energy-dispersive X-ray spectroscopy (EDX). In this context, the overall amorphous structure is retained, as evidenced by X-ray powder diffraction (XRD). We further demonstrate that the level of doping for both elements can be adjusted by changing the BG/ion concentration ratio during laser fragmentation. Consecutive ion release experiments using inductively-coupled plasma mass spectrometry (ICP-MS) were conducted to assess the potential bioactivity of the doped nanoscopic BG samples, and cell culture experiments using MG-63 osteoblast-like cells demonstrated their cytocompatibility. The elegant method of in situ co-doping of Fe and Cu ions during BG nanosizing may provide functionality-advanced biomaterials for future studies on angiogenesis or bone regeneration, particularly as the level of doping may be adjusted by ion concentrations and ion type in solution.
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Affiliation(s)
- Yaya Li
- Institute of Technical Chemistry I, University of Duisburg-Essen and Center for NanoIntegration Duisburg-Essen, CENIDE, Essen, Germany
| | - Vaijayanthi Ramesh
- Institute of Technical Chemistry I, University of Duisburg-Essen and Center for NanoIntegration Duisburg-Essen, CENIDE, Essen, Germany
| | - Faina Bider
- Institute of Biomaterials, Department of Materials Science and Engineering, University of Erlangen-Nuremberg, Erlangen, Germany
| | - Nathan Bradshaw
- Institute of Technical Chemistry I, University of Duisburg-Essen and Center for NanoIntegration Duisburg-Essen, CENIDE, Essen, Germany
| | - Christoph Rehbock
- Institute of Technical Chemistry I, University of Duisburg-Essen and Center for NanoIntegration Duisburg-Essen, CENIDE, Essen, Germany
| | - Aldo R Boccaccini
- Institute of Biomaterials, Department of Materials Science and Engineering, University of Erlangen-Nuremberg, Erlangen, Germany
| | - Stephan Barcikowski
- Institute of Technical Chemistry I, University of Duisburg-Essen and Center for NanoIntegration Duisburg-Essen, CENIDE, Essen, Germany
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9
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Ziefuss AR, Willeke M, Miertz M, Heinemann A, Rehbock C, Barcikowski S. Influence of Pt alloying on the fluorescence of fully inorganic, colloidal gold nanoclusters. Chemphyschem 2022; 23:e202200033. [PMID: 35380738 PMCID: PMC9321736 DOI: 10.1002/cphc.202200033] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2022] [Revised: 03/31/2022] [Indexed: 11/25/2022]
Abstract
Noble metal alloy nanoclusters (NCs) are interesting systems as the properties of two or more elements can be combined in one particle, leading to interesting fluorescence phenomena. However, previous studies have been exclusively performed on ligand‐capped NCs from wet chemical synthesis. This makes it difficult to differentiate to which extent the fluorescence is affected by ligand‐induced effects or the elemental composition of the metal core. In this work, we used laser fragmentation in liquids (LFL) to fabricate colloidal gold‐rich bi‐metallic AuPt NCs in the absence of organic ligands and demonstrate the suitability of this technique to produce molar fraction series of 1nm alloy NC. We found that photoluminescence of ligand‐free NCs is not a phenomenon limited to Au. However, even minute amounts of Pt atoms in the AuPt NCs lead to quenching and red‐shift of the fluorescence, which may be attributed to the altered surface charge density.
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Affiliation(s)
- Anna R Ziefuss
- University of Duisburg-Essen - Campus Essen: Universitat Duisburg-Essen - Campus Essen, Technical chemistry I, GERMANY
| | - Michael Willeke
- University of Duisburg-Essen - Campus Essen: Universitat Duisburg-Essen - Campus Essen, Tecnical Chemistry I, GERMANY
| | - Matthias Miertz
- University of Duisburg-Essen - Campus Essen: Universitat Duisburg-Essen - Campus Essen, Technical chemistry I, GERMANY
| | - Alexander Heinemann
- University of Duisburg-Essen - Campus Essen: Universitat Duisburg-Essen - Campus Essen, Technical chemistry I, GERMANY
| | - Christoph Rehbock
- Universität Duisburg-Essen - Campus Essen: Universitat Duisburg-Essen - Campus Essen, Technical chemistry I, GERMANY
| | - Stephan Barcikowski
- University of Duisburg-Essen, Technical Chemistry I, Universitaetsstrasse 5-7, 45141, Essen, GERMANY
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10
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Zwiehoff S, Johny J, Behrends C, Landmann A, Mentzel F, Bäumer C, Kröninger K, Rehbock C, Timmermann B, Barcikowski S. Enhancement of Proton Therapy Efficiency by Noble Metal Nanoparticles Is Driven by the Number and Chemical Activity of Surface Atoms. Small 2022; 18:e2106383. [PMID: 34921500 DOI: 10.1002/smll.202106383] [Citation(s) in RCA: 4] [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] [Subscribe] [Scholar Register] [Received: 10/20/2021] [Revised: 11/18/2021] [Indexed: 06/14/2023]
Abstract
Proton-based radiotherapy is a modern technique for the treatment of solid tumors with significantly reduced side effects to adjacent tissues. Biocompatible nanoparticles (NPs) with high atomic numbers are known to serve as sensitizers and to enhance treatment efficacy, which is commonly believed to be attributed to the generation of reactive oxygen species (ROS). However, little systematic knowledge is available on how either physical effects due to secondary electron generation or the particle surface chemistry affect ROS production. Thereto, ligand-free colloidal platinum (Pt) and gold (Au) NPs with well-controlled particle size distributions and defined total surface area are proton-irradiated. A fluorescence-based assay is developed to monitor the formation of ROS using terephthalic acid as a cross-effect-free dye. The findings indicate that proton irradiation (PI)-induced ROS formation sensitized by noble metal NPs is driven by the total available particle surface area rather than particle size or mass. Furthermore, a distinctive material effect with Pt being more active than Au is observed which clearly indicates that the chemical reactivity of the NP surface is a main contributor to ROS generation upon PI. These results pave the way towards an in-depth understanding of the NP-induced sensitizing effects upon PI and hence a well-controlled enhanced therapy.
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Affiliation(s)
- Sandra Zwiehoff
- University of Duisburg-Essen, Technical Chemistry I, (CENIDE), (ZMB), 45141, Essen, Germany
| | - Jacob Johny
- University of Duisburg-Essen, Technical Chemistry I, (CENIDE), (ZMB), 45141, Essen, Germany
| | - Carina Behrends
- TU Dortmund University, Department of Physics, 44227, Dortmund, Germany
- West German Proton Therapy Centre Essen (WPE), West German Cancer Centre (WTZ), University Hospital Essen, 45147, Essen, Germany
| | - Alina Landmann
- TU Dortmund University, Department of Physics, 44227, Dortmund, Germany
| | - Florian Mentzel
- TU Dortmund University, Department of Physics, 44227, Dortmund, Germany
| | - Christian Bäumer
- TU Dortmund University, Department of Physics, 44227, Dortmund, Germany
- West German Proton Therapy Centre Essen (WPE), West German Cancer Centre (WTZ), University Hospital Essen, 45147, Essen, Germany
- German Cancer Consortium (DKTK), 69120, Heidelberg, Germany
| | - Kevin Kröninger
- TU Dortmund University, Department of Physics, 44227, Dortmund, Germany
| | - Christoph Rehbock
- University of Duisburg-Essen, Technical Chemistry I, (CENIDE), (ZMB), 45141, Essen, Germany
| | - Beate Timmermann
- West German Proton Therapy Centre Essen (WPE), West German Cancer Centre (WTZ), University Hospital Essen, 45147, Essen, Germany
- German Cancer Consortium (DKTK), 69120, Heidelberg, Germany
- Faculty of Medicine, University of Duisburg-Essen, Department of Particle Therapy, University Hospital Essen, 45147, Essen, Germany
| | - Stephan Barcikowski
- University of Duisburg-Essen, Technical Chemistry I, (CENIDE), (ZMB), 45141, Essen, Germany
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11
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Stein F, Schielke A, Barcikowski S, Rehbock C. Influence of Gold/Silver Ratio in Ablative Nanoparticles on Their Interaction with Aptamers and Functionality of the Obtained Conjugates. Bioconjug Chem 2021; 32:2439-2446. [PMID: 34730343 DOI: 10.1021/acs.bioconjchem.1c00468] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Nano-bio-conjugates, featuring noble metal gold-silver alloy nanoparticles, represent a versatile tool in diagnostics and therapeutics due to their plasmonic and antimicrobial properties tunable by the particle's gold molar fraction. However, little is known about how the binding of thiolated biomolecules to noble metal nanoparticles is influenced by the fraction of gold and silver atoms on the nanoparticle's surface and to which extend this would affect the functionality of the conjugated biomolecules. In this work, we generated gold-silver alloy nanoparticles with average diameters of 7-8 nm using the modern, surfactant-free laser ablation in liquids (LAL) synthesis approach. We conjugated them with thiolated miniStrep aptamer ligands at well-controlled aptamer-to-nanoparticle surface area ratios with maxima between 12 and 27 pmol aptamer/cm2 particle surface area. The results revealed a clear correlation between surface coverage and the nanoparticles' nominal gold/silver ratio, with maximum coverage reached for gold-rich alloys and a pronounced maximum for silver-rich alloys. However, the conjugates' functionality, evaluated by binding of streptavidin, was surprisingly robust and hardly affected by the nominal composition. However, 1.5 times higher surface coverage was needed to obtain maximum functionality in the silver-rich conjugates. Based on these results, it may be concluded that the nominal composition of gold-silver alloy nano-bioconjugates is freely tunable without a pronounced impact on the attached ligands' functionality, a finding highly relevant for the flexible design of nano-bio-conjugates for future biomedical applications. This study's results may facilitate the design of alloy nano-bio-conjugates for future applications in therapeutics and diagnostics.
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Affiliation(s)
- Frederic Stein
- Technical Chemistry I, University of Duisburg-Essen and Center for Nanointegration Duisburg-Essen (CENIDE), Universitätsstr. 7, 45141 Essen, Germany
| | - Andreas Schielke
- Technical Chemistry I, University of Duisburg-Essen and Center for Nanointegration Duisburg-Essen (CENIDE), Universitätsstr. 7, 45141 Essen, Germany
| | - Stephan Barcikowski
- Technical Chemistry I, University of Duisburg-Essen and Center for Nanointegration Duisburg-Essen (CENIDE), Universitätsstr. 7, 45141 Essen, Germany
| | - Christoph Rehbock
- Technical Chemistry I, University of Duisburg-Essen and Center for Nanointegration Duisburg-Essen (CENIDE), Universitätsstr. 7, 45141 Essen, Germany
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12
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Ramesh V, Rehbock C, Giera B, Karnes JJ, Forien JB, Angelov SD, Schwabe K, Krauss JK, Barcikowski S. Comparing Direct and Pulsed-Direct Current Electrophoretic Deposition on Neural Electrodes: Deposition Mechanism and Functional Influence. Langmuir 2021; 37:9724-9734. [PMID: 34357777 DOI: 10.1021/acs.langmuir.1c01081] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Electrophoretic deposition (EPD) of platinum nanoparticles (PtNPs) on platinum-iridium (Pt-Ir) neural electrode surfaces is a promising strategy to tune the impedance of electrodes implanted for deep brain stimulation in various neurological disorders such as advanced Parkinson's disease and dystonia. However, previous results are contradicting as impedance reduction was observed on flat samples while in three-dimensional (3D) structures, an increase in impedance was observed. Hence, defined correlations between coating properties and impedance are to date not fully understood. In this work, the influence of direct current (DC) and pulsed-DC electric fields on NP deposition is systematically compared and clear correlations between surface coating homogeneity and in vitro impedance are established. The ligand-free NPs were synthesized via pulsed laser processing in liquid, yielding monomodal particle size distributions, verified by analytical disk centrifugation (ADC). Deposits formed were quantified by UV-vis supernatant analysis and further characterized by scanning electron microscopy (SEM) with semiautomated interparticle distance analyses. Our findings reveal that pulsed-DC electric fields yield more ordered surface coatings with a lower abundance of particle assemblates, while DC fields produce coatings with more pronounced aggregation. Impedance measurements further highlight that impedance of the corresponding electrodes is significantly reduced in the case of more ordered coatings realized by pulsed-DC depositions. We attribute this phenomenon to the higher active surface area of the adsorbed NPs in homogeneous coatings and the reduced particle-electrode electrical contact in NP assemblates. These results provide insight for the efficient EPD of bare metal NPs on micron-sized surfaces for biomedical applications in neuroscience and correlate coating homogeneity with in vitro functionality.
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Affiliation(s)
- Vaijayanthi Ramesh
- Technical Chemistry I, Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, 45141 Essen, Germany
| | - Christoph Rehbock
- Technical Chemistry I, Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, 45141 Essen, Germany
| | - Brian Giera
- Center for Engineered Materials and Manufacturing, Lawrence Livermore National Laboratory, Livermore, California 94550, United States
| | - John J Karnes
- Center for Engineered Materials and Manufacturing, Lawrence Livermore National Laboratory, Livermore, California 94550, United States
| | - Jean-Baptiste Forien
- Center for Engineered Materials and Manufacturing, Lawrence Livermore National Laboratory, Livermore, California 94550, United States
| | - Svilen D Angelov
- Department of Neurosurgery, Hannover Medical School, 30625 Hannover, Germany
| | - Kerstin Schwabe
- Department of Neurosurgery, Hannover Medical School, 30625 Hannover, Germany
| | - Joachim K Krauss
- Department of Neurosurgery, Hannover Medical School, 30625 Hannover, Germany
| | - Stephan Barcikowski
- Technical Chemistry I, Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, 45141 Essen, Germany
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13
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Ziefuss AR, Steenbock T, Benner D, Plech A, Göttlicher J, Teubner M, Grimm-Lebsanft B, Rehbock C, Comby-Zerbino C, Antoine R, Amans D, Chakraborty I, Bester G, Nachev M, Sures B, Rübhausen M, Parak WJ, Barcikowski S. Photoluminescence of Fully Inorganic Colloidal Gold Nanocluster and Their Manipulation Using Surface Charge Effects. Adv Mater 2021; 33:e2101549. [PMID: 34165866 DOI: 10.1002/adma.202101549] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/24/2021] [Revised: 04/08/2021] [Indexed: 06/13/2023]
Abstract
Fully inorganic, colloidal gold nanoclusters (NCs) constitute a new class of nanomaterials that are clearly distinguishable from their commonly studied metal-organic ligand-capped counterparts. As their synthesis by chemical methods is challenging, details about their optical properties remain widely unknown. In this work, laser fragmentation in liquids is performed to produce fully inorganic and size-controlled colloidal gold NCs with monomodal particle size distributions and an fcc-like structure. Results reveal that these NCs exhibit highly pronounced photoluminescence with quantum yields of 2%. The emission behavior of small (2-2.5 nm) and ultrasmall (<1 nm) NCs is significantly different and dominated by either core- or surface-based emission states. It is further verified that emission intensities are a function of the surface charge density, which is easily controllable by the pH of the surrounding medium. This experimentally observed correlation between surface charge and photoluminescence emission intensity is confirmed by density functional theoretical simulations, demonstrating that fully inorganic NCs provide an appropriate material to bridge the gap between experimental and computational studies of NCs. The presented study deepens the understanding of electronic structures in fully inorganic colloidal gold NCs and how to systematically tune their optical properties via surface charge density and particle size.
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Affiliation(s)
- Anna R Ziefuss
- Technical Chemistry I and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, Universitätsstraße 1-7, 45141, Essen, Germany
| | - Torben Steenbock
- Department of Chemistry, Universität Hamburg, Institute for Physical Chemistry, Luruper Chaussee 149, HARBOR, Building 610, D-22761, Hamburg, Germany
| | - Dominik Benner
- Department of Chemistry, Universität Hamburg, Institute for Physical Chemistry, Luruper Chaussee 149, HARBOR, Building 610, D-22761, Hamburg, Germany
| | - Anton Plech
- Institute for Photon Science and Synchrotron Radiation, Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, 76344, Eggenstein-Leopoldshafen, Germany
| | - Jörg Göttlicher
- Institute for Photon Science and Synchrotron Radiation, Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, 76344, Eggenstein-Leopoldshafen, Germany
| | - Melissa Teubner
- Institut für Nanostruktur und Festkörperphysik, Center for Free Electron Laser Science (CFEL), Universität Hamburg, Luruper Chaussee 149, 22761, Hamburg, Germany
- Department of Inorganic Chemistry, RWTH Aachen University, Landoltweg 1, 52074, Aachen, Germany
| | - Benjamin Grimm-Lebsanft
- Institut für Nanostruktur und Festkörperphysik, Center for Free Electron Laser Science (CFEL), Universität Hamburg, Luruper Chaussee 149, 22761, Hamburg, Germany
| | - Christoph Rehbock
- Technical Chemistry I and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, Universitätsstraße 1-7, 45141, Essen, Germany
| | - Clothilde Comby-Zerbino
- Univ Lyon, Université Claude Bernard Lyon 1, CNRS, UMR5306, Institut Lumière Matière, Villeurbanne, F-69100, France
| | - Rodolphe Antoine
- Univ Lyon, Université Claude Bernard Lyon 1, CNRS, UMR5306, Institut Lumière Matière, Villeurbanne, F-69100, France
| | - David Amans
- Univ Lyon, Université Claude Bernard Lyon 1, CNRS, UMR5306, Institut Lumière Matière, Villeurbanne, F-69100, France
| | - Indranath Chakraborty
- Department of Physics and Center for Hybrid Nanostructure (CHyN), Universität Hamburg, Luruper Chaussee 149, 22761, Hamburg, Germany
| | - Gabriel Bester
- Department of Chemistry, Universität Hamburg, Institute for Physical Chemistry, Luruper Chaussee 149, HARBOR, Building 610, D-22761, Hamburg, Germany
- Department of Physics, Universität Hamburg, Institut für Nanostruktur und Festkörperphysik, Luruper Chausee 149, HARBOR, 22761, Hamburg, Germany
| | - Milen Nachev
- Department of Aquatic Ecology and Centre for Water and Environmental Research, University of Duisburg-Essen, Universitätsstraße 5, 45141, Essen, Germany
| | - Bernd Sures
- Department of Aquatic Ecology and Centre for Water and Environmental Research, University of Duisburg-Essen, Universitätsstraße 5, 45141, Essen, Germany
| | - Michael Rübhausen
- Institut für Nanostruktur und Festkörperphysik, Center for Free Electron Laser Science (CFEL), Universität Hamburg, Luruper Chaussee 149, 22761, Hamburg, Germany
| | - Wolfgang J Parak
- Department of Physics and Center for Hybrid Nanostructure (CHyN), Universität Hamburg, Luruper Chaussee 149, 22761, Hamburg, Germany
- Department of Chemistry, Universität Hamburg, Grindelallee 117, 20146, Hamburg, Germany
| | - Stephan Barcikowski
- Technical Chemistry I and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, Universitätsstraße 1-7, 45141, Essen, Germany
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14
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Zeng Y, Havenridge S, Gharib M, Baksi A, Weerawardene KLDM, Ziefuß AR, Strelow C, Rehbock C, Mews A, Barcikowski S, Kappes MM, Parak WJ, Aikens CM, Chakraborty I. Impact of Ligands on Structural and Optical Properties of Ag 29 Nanoclusters. J Am Chem Soc 2021; 143:9405-9414. [PMID: 34138547 DOI: 10.1021/jacs.1c01799] [Citation(s) in RCA: 35] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
A ligand exchange strategy has been employed to understand the role of ligands on the structural and optical properties of atomically precise 29 atom silver nanoclusters (NCs). By ligand optimization, ∼44-fold quantum yield (QY) enhancement of Ag29(BDT)12-x(DHLA)x NCs (x = 1-6) was achieved, where BDT and DHLA refer to 1,3-benzene-dithiol and dihydrolipoic acid, respectively. High-resolution mass spectrometry was used to monitor ligand exchange, and structures of the different NCs were obtained through density functional theory (DFT). The DFT results from Ag29(BDT)11(DHLA) NCs were further experimentally verified through collisional cross-section (CCS) analysis using ion mobility mass spectrometry (IM MS). An excellent match in predicted CCS values and optical properties with the respective experimental data led to a likely structure of Ag29(DHLA)12 NCs consisting of an icosahedral core with an Ag16S24 shell. Combining the experimental observation with DFT structural analysis of a series of atomically precise NCs, Ag29-yAuy(BDT)12-x(DHLA)x (where y, x = 0,0; 0,1; 0,12 and 1,12; respectively), it was found that while the metal core is responsible for the origin of photoluminescence (PL), ligands play vital roles in determining their resultant PLQY.
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Affiliation(s)
- Yuan Zeng
- Department of Physics and Center for Hybrid Nanostructure (CHyN), University of Hamburg, Luruper Chaussee 149, Hamburg 22761, Hamburg, Germany
| | - Shana Havenridge
- Department of Chemistry, Kansas State University, Manhattan, Kansas 66506, United States
| | - Mustafa Gharib
- Department of Physics and Center for Hybrid Nanostructure (CHyN), University of Hamburg, Luruper Chaussee 149, Hamburg 22761, Hamburg, Germany.,Radiation Biology Department, Egyptian Atomic Energy Authority (EAEA), Cairo 11787, Egypt
| | - Ananya Baksi
- Institute of Nanotechnology, Karlsruhe Institute of Technology, Eggenstein-Leopoldshafen 76344, Germany
| | - K L Dimuthu M Weerawardene
- Department of Chemistry, Kansas State University, Manhattan, Kansas 66506, United States.,Department of Chemistry, Baylor University, Waco, Texas 76798, United States
| | - Anna Rosa Ziefuß
- Department of Technical Chemistry I, University of Duisburg-Essen and Center for Nanointegration Duisburg-Essen (CENIDE), Essen 45141, Germany
| | - Christian Strelow
- Department of Chemistry, University of Hamburg, Grindelallee 117, Hamburg 20146, Germany
| | - Christoph Rehbock
- Department of Technical Chemistry I, University of Duisburg-Essen and Center for Nanointegration Duisburg-Essen (CENIDE), Essen 45141, Germany
| | - Alf Mews
- Department of Chemistry, University of Hamburg, Grindelallee 117, Hamburg 20146, Germany
| | - Stephan Barcikowski
- Department of Technical Chemistry I, University of Duisburg-Essen and Center for Nanointegration Duisburg-Essen (CENIDE), Essen 45141, Germany
| | - Manfred M Kappes
- Institute of Nanotechnology, Karlsruhe Institute of Technology, Eggenstein-Leopoldshafen 76344, Germany
| | - Wolfgang J Parak
- Department of Physics and Center for Hybrid Nanostructure (CHyN), University of Hamburg, Luruper Chaussee 149, Hamburg 22761, Hamburg, Germany.,Department of Chemistry, University of Hamburg, Grindelallee 117, Hamburg 20146, Germany.,CIC Biomagune, San Sebastian 20014, Spain
| | - Christine M Aikens
- Department of Chemistry, Kansas State University, Manhattan, Kansas 66506, United States
| | - Indranath Chakraborty
- Department of Physics and Center for Hybrid Nanostructure (CHyN), University of Hamburg, Luruper Chaussee 149, Hamburg 22761, Hamburg, Germany
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15
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Al-Zubeidi A, Stein F, Flatebo C, Rehbock C, Hosseini Jebeli SA, Landes CF, Barcikowski S, Link S. Single-Particle Hyperspectral Imaging Reveals Kinetics of Silver Ion Leaching from Alloy Nanoparticles. ACS Nano 2021; 15:8363-8375. [PMID: 33886276 DOI: 10.1021/acsnano.0c10150] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Gold-silver alloy nanoparticles are interesting for multiple applications, including heterogeneous catalysis, optical sensing, and antimicrobial properties. The inert element gold acts as a stabilizer for silver to prevent particle corrosion, or conversely, to control the release kinetics of antimicrobial silver ions for long-term efficiency at minimum cytotoxicity. However, little is known about the kinetics of silver ion leaching from bimetallic nanoparticles and how it is correlated with silver content, especially not on a single-particle level. To characterize the kinetics of silver ion release from gold-silver alloy nanoparticles, we employed a combination of electron microscopy and single-particle hyperspectral imaging with an acquisition speed fast enough to capture the irreversible silver ion leaching. Single-particle leaching profiles revealed a reduction in silver ion leaching rate due to the alloying with gold as well as two leaching stages, with a large heterogeneity in rate constants. We modeled the initial leaching stage as a shrinking-particle with a rate constant that exponentially depends on the silver content. The second, slower leaching stage is controlled by the electrochemical oxidation potential of the alloy being steadily increased by the change in relative gold content and diffusion of silver atoms through the lattice. Interestingly, individual nanoparticles with similar sizes and compositions exhibited completely different silver ion leaching yields. Most nanoparticles released silver completely, but 25% of them appeared to arrest leaching. Additionally, nanoparticles became slightly porous. Alloy nanoparticles, produced by scalable laser ablation in liquid, together with kinetic studies of silver ion leaching, provide an approach to design the durability or bioactivity of alloy nanoparticles.
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Affiliation(s)
- Alexander Al-Zubeidi
- Department of Chemistry, Rice University, 6100 Main Street, Houston, Texas 77005, United States
- Smalley-Curl Institute, Rice University, 6100 Main Street, Houston, Texas 77005, United States
| | - Frederic Stein
- Technical Chemistry I and Center for Nanointegration, Duisburg-Essen, University of Duisburg-Essen, Universitätsstraße 7, 45141 Essen, Germany
| | - Charlotte Flatebo
- Department of Chemistry, Rice University, 6100 Main Street, Houston, Texas 77005, United States
- Smalley-Curl Institute, Rice University, 6100 Main Street, Houston, Texas 77005, United States
- Applied Physics Program, Rice University, 6100 Main Street, Houston, Texas 77005, United States
| | - Christoph Rehbock
- Technical Chemistry I and Center for Nanointegration, Duisburg-Essen, University of Duisburg-Essen, Universitätsstraße 7, 45141 Essen, Germany
| | - Seyyed Ali Hosseini Jebeli
- Smalley-Curl Institute, Rice University, 6100 Main Street, Houston, Texas 77005, United States
- Department of Electrical and Computer Engineering, Rice University, 6100 Main Street, Houston, Texas 77005, United States
| | - Christy F Landes
- Department of Chemistry, Rice University, 6100 Main Street, Houston, Texas 77005, United States
- Smalley-Curl Institute, Rice University, 6100 Main Street, Houston, Texas 77005, United States
- Department of Electrical and Computer Engineering, Rice University, 6100 Main Street, Houston, Texas 77005, United States
- Department of Chemical and Biomolecular Engineering, Rice University, 6100 Main Street, Houston, Texas 77005, United States
| | - Stephan Barcikowski
- Technical Chemistry I and Center for Nanointegration, Duisburg-Essen, University of Duisburg-Essen, Universitätsstraße 7, 45141 Essen, Germany
| | - Stephan Link
- Department of Chemistry, Rice University, 6100 Main Street, Houston, Texas 77005, United States
- Smalley-Curl Institute, Rice University, 6100 Main Street, Houston, Texas 77005, United States
- Department of Electrical and Computer Engineering, Rice University, 6100 Main Street, Houston, Texas 77005, United States
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16
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Li Y, Rehbock C, Nachev M, Stamm J, Sures B, Blaeser A, Barcikowski S. Matrix-specific mechanism of Fe ion release from laser-generated 3D-printable nanoparticle-polymer composites and their protein adsorption properties. Nanotechnology 2020; 31:405703. [PMID: 32434157 DOI: 10.1088/1361-6528/ab94da] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Nanocomposites have been widely applied in medical device fabrication and tissue-engineering applications. In this context, the release of metal ions as well as protein adsorption capacity are hypothesized to be two key processes directing nanocomposite-cell interactions. The objective of this study is to understand the polymer-matrix effects on ion release kinetics and their relations with protein adsorption. Laser ablation in macromolecule solutions was employed for synthesizing Au and Fe nanoparticle-loaded nanocomposites based on thermoplastic polyurethane (TPU) and alginate. Confocal microscopy revealed a three-dimensional homogeneous dispersion of laser-generated nanoparticles in the polymer. The physicochemical properties revealed a pronounced dependence upon embedding of Fe and Au nanoparticles in both polymer matrices. Interestingly, the total Fe ion concentration released from alginate gels under static conditions decreased with increasing mass loadings, a phenomenon only found in the Fe-alginate system and not in the Cu/Zn-alginate and Fe-TPU control system (where the effects were proportioonal to the nanoparticle load). A detailed mechanistic examination of iron the ion release process revealed that it is probably not the redox potential of metals and diffusion of metal ions alone, but also the solubility of nano-metal oxides and affinity of metal ions for alginate that lead to the special release behaviors of iron ions from alginate gels. The amount of adsorbed bovine serum albumin (BSA) and collagen I on the surface of both the alginate and TPU composites was significantly increased in contrast to the unloaded control polymers and could be correlated with the concentration of released Fe ions and the porosity of composites, but was independent of the global surface charge. Interestingly, these effects were already highly pronounced at minute loadings with Fe nanoparticles down to 200 ppm. Moreover, the laser-generated Fe or Au nanoparticle-loaded alginate composites were shown to be a suitable bioink for 3D printing. These findings are potentially relevant for ion-sensitive bio-responses in cell differentiation, endothelisation, vascularisation, or wound healing.
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Affiliation(s)
- Yaya Li
- Technical Chemistry I and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, Universitätsstr. 5-7, Essen 45141, Germany
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17
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Kamp M, Tymoczko A, Popescu R, Schürmann U, Nadarajah R, Gökce B, Rehbock C, Gerthsen D, Barcikowski S, Kienle L. Composition and structure of magnetic high-temperature-phase, stable Fe-Au core-shell nanoparticles with zero-valent bcc Fe core. Nanoscale Adv 2020; 2:3912-3920. [PMID: 36132793 PMCID: PMC9417649 DOI: 10.1039/d0na00514b] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/23/2020] [Accepted: 08/09/2020] [Indexed: 05/14/2023]
Abstract
Advanced quantitative TEM/EDXS methods were used to characterize different ultrastructures of magnetic Fe-Au core-shell nanoparticles formed by laser ablation in liquids. The findings demonstrate the presence of Au-rich alloy shells with varying composition in all structures and elemental bcc Fe cores. The identified structures are metastable phases interpreted by analogy to the bulk phase diagram. Based on this, we propose a formation mechanism of these complex ultrastructures. To show the magnetic response of these magnetic core nanoparticles protected by a noble metal shell, we demonstrate the formation of nanostrands in the presence of an external magnetic field. We find that it is possible to control the lengths of these strands by the iron content within the alloy nanoparticles.
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Affiliation(s)
- Marius Kamp
- Institute for Materials Science, Synthesis and Real Structure, Kiel University Kaiserstraße 2 24143 Kiel Germany
| | - Anna Tymoczko
- Technical Chemistry I, Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen Universitätsstrasse 7 45141 Essen Germany
| | - Radian Popescu
- Laboratory for Electron Microscopy (LEM), Karlsruhe Institute of Technology (KIT) Engesserstr. 7 76131 Karlsruhe Germany
| | - Ulrich Schürmann
- Institute for Materials Science, Synthesis and Real Structure, Kiel University Kaiserstraße 2 24143 Kiel Germany
| | - Ruksan Nadarajah
- Technical Chemistry I, Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen Universitätsstrasse 7 45141 Essen Germany
| | - Bilal Gökce
- Technical Chemistry I, Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen Universitätsstrasse 7 45141 Essen Germany
| | - Christoph Rehbock
- Technical Chemistry I, Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen Universitätsstrasse 7 45141 Essen Germany
| | - Dagmar Gerthsen
- Laboratory for Electron Microscopy (LEM), Karlsruhe Institute of Technology (KIT) Engesserstr. 7 76131 Karlsruhe Germany
| | - Stephan Barcikowski
- Technical Chemistry I, Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen Universitätsstrasse 7 45141 Essen Germany
| | - Lorenz Kienle
- Institute for Materials Science, Synthesis and Real Structure, Kiel University Kaiserstraße 2 24143 Kiel Germany
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18
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Schielke A, Rehbock C, Barcikowski S. Aptamers on laser‐generated gold nanoparticles – A novel approach towards green point‐of‐care – diagnostic tools for biotechnology. CHEM-ING-TECH 2020. [DOI: 10.1002/cite.202055318] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [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)
- A. Schielke
- Universität Duisburg-Essen Technische Chemie I und Centre for Nanointegration Universitätsstr. 7 45141 Essen Germany
| | - C. Rehbock
- Universität Duisburg-Essen Technische Chemie I und Centre for Nanointegration Universitätsstr. 7 45141 Essen Germany
| | - S. Barcikowski
- Universität Duisburg-Essen Technische Chemie I und Centre for Nanointegration Universitätsstr. 7 45141 Essen Germany
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19
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Brändle K, Bergmann TC, Raic A, Li Y, Million N, Rehbock C, Barcikowski S, Lee-Thedieck C. Iron Nanoparticle Composite Hydrogels for Studying Effects of Iron Ion Release on Red Blood Cell In Vitro Production. ACS Appl Bio Mater 2020; 3:4766-4778. [PMID: 35021724 DOI: 10.1021/acsabm.0c00297] [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] [Indexed: 02/07/2023]
Abstract
Growing numbers of complex surgical interventions increase the need for blood transfusions, which cannot be fulfilled by the number of donors. Therefore, the interest in producing erythrocytes from their precursors-the hematopoietic stem and progenitor cells (HSPCs)-in laboratories is rising. To enable this, in vitro systems are needed, which allow analysis of the effects of essential factors such as iron on erythroid development. For this purpose, iron ion-releasing systems based on poly(ethylene glycol) (PEG)-iron nanocomposites are developed to assess if gradual iron release improves iron bioavailability during in vitro erythroid differentiation. The nanocomposites are synthesized using surfactant-free pulsed laser ablation of iron directly in the PEG solution. The iron concentrations released from the material are sufficient to influence in vitro erythropoiesis. In this way, the production of erythroid cells cultured on flat PEG-iron nanocomposite hydrogel pads can be enhanced. In contrast, erythroid differentiation is not enhanced in the biomimetic macroporous 3D composite scaffolds, possibly because of local iron overload within the pores of the system. In conclusion, the developed iron nanoparticle-PEG composite hydrogel allows constant iron ion release and thus paves the way (i) to understand the role of iron during erythropoiesis and (ii) toward the development of biomaterials with a controlled iron release for directing erythropoiesis in culture.
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Affiliation(s)
- Katharina Brändle
- Institute of Functional Interfaces, Karlsruhe Institute of Technology (KIT), Eggenstein-Leopoldshafen 76344, Germany.,Institute of Cell Biology and Biophysics, Leibniz University Hannover, Hannover 30419, Germany
| | - Timna C Bergmann
- Institute of Cell Biology and Biophysics, Leibniz University Hannover, Hannover 30419, Germany
| | - Annamarija Raic
- Institute of Functional Interfaces, Karlsruhe Institute of Technology (KIT), Eggenstein-Leopoldshafen 76344, Germany.,Institute of Cell Biology and Biophysics, Leibniz University Hannover, Hannover 30419, Germany
| | - Yaya Li
- Technical Chemistry I and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, Universitätsstr. 5-7, Essen 45141, Germany
| | - Nina Million
- Technical Chemistry I and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, Universitätsstr. 5-7, Essen 45141, Germany
| | - Christoph Rehbock
- Technical Chemistry I and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, Universitätsstr. 5-7, Essen 45141, Germany
| | - Stephan Barcikowski
- Technical Chemistry I and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, Universitätsstr. 5-7, Essen 45141, Germany
| | - Cornelia Lee-Thedieck
- Institute of Cell Biology and Biophysics, Leibniz University Hannover, Hannover 30419, Germany
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20
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Coger V, Million N, Rehbock C, Sures B, Nachev M, Barcikowski S, Wistuba N, Strauß S, Vogt PM. Tissue Concentrations of Zinc, Iron, Copper, and Magnesium During the Phases of Full Thickness Wound Healing in a Rodent Model. Biol Trace Elem Res 2019; 191:167-176. [PMID: 30552609 PMCID: PMC6656798 DOI: 10.1007/s12011-018-1600-y] [Citation(s) in RCA: 47] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/13/2018] [Accepted: 11/30/2018] [Indexed: 01/19/2023]
Abstract
Wound healing is a complex orchestration of processes involving cell proliferation, migration, differentiation, anabolism, and catabolism in order to restore skin continuity. Within these processes, elements such as metallic ions are involved due to their implications in cell behavior and enzymatic activity regulation. This study analyzed the kinetics of zinc, iron, copper and magnesium concentrations in a full thickness open wound rat model over 14 days. We made wounds with a diameter of 6 mm on the back of Lewis rats and let them heal naturally prior to analysis by histology and inductively coupled plasma mass spectrometry analysis. Histological and immunofluorescence analysis confirmed an inflammation phase until 7 days, epithelial proliferation phase from 16 h to 10 days, and remodeling phase from 7 days onward. These defined phases were correlated with the measured metal element kinetics. Zinc concentrations showed an inverted parabolic progression between 30.4 and a maximum of 39.9 μg/g dry weight. Magnesium values had a similar pattern between 283 and 499 μg/g dry weight. Copper concentrations, on the other hand, followed an inverted sigmoid trend with a decrease from 9.8 to 1.5 μg/g dry weight. Iron had a slight decrease in concentration for 24 h followed by an increase to a maximum of 466 μg/g dry weight. In conclusion, zinc, iron, and copper, even though differing in their total mass within the wound, exhibited concentration curve transitions at day 3. Interestingly, this time point correlates with the maximum proliferating keratinocyte rate during the proliferation phase.
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Affiliation(s)
- Vincent Coger
- Department of Plastic, Aesthetic, Hand and Reconstructive Surgery, Hannover Medical School, Hannover, Germany.
| | - Nina Million
- Technical Chemistry I and Center for Nanointegration Duisburg-Essen, University of Duisburg-Essen, Duisburg, Germany
| | - Christoph Rehbock
- Technical Chemistry I and Center for Nanointegration Duisburg-Essen, University of Duisburg-Essen, Duisburg, Germany
| | - Bernd Sures
- Aquatic Ecology and Centre for Water and Environmental Research (ZWU), University of Duisburg-Essen, Essen, Germany
| | - Milen Nachev
- Aquatic Ecology and Centre for Water and Environmental Research (ZWU), University of Duisburg-Essen, Essen, Germany
| | - Stephan Barcikowski
- Technical Chemistry I and Center for Nanointegration Duisburg-Essen, University of Duisburg-Essen, Duisburg, Germany
| | - Nina Wistuba
- Department of Plastic, Aesthetic, Hand and Reconstructive Surgery, Hannover Medical School, Hannover, Germany
| | - Sarah Strauß
- Department of Plastic, Aesthetic, Hand and Reconstructive Surgery, Hannover Medical School, Hannover, Germany
| | - Peter M Vogt
- Department of Plastic, Aesthetic, Hand and Reconstructive Surgery, Hannover Medical School, Hannover, Germany
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21
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Ziefuß AR, Barcikowski S, Rehbock C. Synergism between Specific Halide Anions and pH Effects during Nanosecond Laser Fragmentation of Ligand-Free Gold Nanoparticles. Langmuir 2019; 35:6630-6639. [PMID: 31025868 DOI: 10.1021/acs.langmuir.9b00418] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Gold nanoclusters (AuNCs) with diameters smaller than 3 nm are an emerging field of research because they possess interesting optical properties, such as photoluminescence. However, to date, it is still difficult to distinguish whether these properties originate from the cores of the nanoparticles or from the adsorbates on their surfaces. Hence, there is a high demand for ligand-free, ultra-small particles because they make it possible to study ligand and core effects separately. Pulsed laser fragmentation in liquids (LFL) is a convenient route for the synthesis of ligand-free AuNCs. The influence of physical parameters, such as melting and evaporation, on the LFL process is well understood both theoretically and experimentally. However, the impact of the chemical composition of the medium during LFL, which critically affects the particle formation process, has been less well examined. Therefore, in this work, we elucidate the extent to which the ionic strength, the pH value, and the nature of the halide anion that is present, that is, F-, Cl-, Br-, or I-, influence the particle size distribution of the LFL product and the mean yield of small particles (<3 nm) of the product. We showed that the yield of small particles can be enhanced by the synergism between pH and specific ion effects, which probably is attributable to the adsorption of specific anions. In addition, our findings indicated that anion-based stabilization depends critically on the type of anion. A direct Hofmeister effect was observed for anions in the neutral pH regime, whereas an indirect Hofmeister series was reported in alkaline solution, which probably was due to the more hydrophilic surfaces of the AuNCs that were formed.
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Affiliation(s)
- Anna Rosa Ziefuß
- University of Duisburg-Essen and Center for Nanointegration Duisburg-Essen (CENIDE) , Essen 45145 , Germany
| | - Stephan Barcikowski
- University of Duisburg-Essen and Center for Nanointegration Duisburg-Essen (CENIDE) , Essen 45145 , Germany
| | - Christoph Rehbock
- University of Duisburg-Essen and Center for Nanointegration Duisburg-Essen (CENIDE) , Essen 45145 , Germany
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22
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Gamrad L, Mancini R, Werner D, Tiedemann D, Taylor U, Ziefuß A, Rehbock C, Klein S, Kues W, Barcikowski S, Rath D. Triplex-hybridizing bioconjugated gold nanoparticles for specific Y-chromosome sequence targeting of bull spermatozoa. Analyst 2018; 142:2020-2028. [PMID: 28487921 DOI: 10.1039/c6an02461k] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Gold nanoparticles (AuNPs) are widely used in biomedical applications for drug targeting and bioimaging. This often neccesitates their functionalization with biomolecules carrying a defined biological function, yielding gold nanoparticle bioconjugates. The utilization of triplex-forming oligonucleotides (TFOs) as ligands gives access to nanoconjugates as tools for specific DNA-related nanotargeting via triplex hybridization. Since triplex hybridization with nanobioconjugates has to date not been shown on biologically relevant samples, sex-specific sperm marking may be an appropriate model system to demonstrate the opportunities of this targeting method in vitro. In this study, we focused on specific labeling of repetitive target sites enriched on the bovine Y-chromosome using triplex forming oligonucleotides. First, the functionality of a specific locked nucleic acid (LNA) sequence was confirmed on bovine free DNA and on demembranated sperm heads. Thereafter, the influence of AuNPs on triplex hybridization was spectrophotometrically analyzed employing synthetic dsDNA, genomic DNA and demembranated sperm heads. Results from the SPR-peak shift indicate that TFO-AuNP hybridize to bovine gDNA in a qualitative and significant manner. These results confirm successful triplex hybridization on biologically relevant target sites as well as the establishment of a method to use gold nanoparticles as a suitable tool for sex-selective hybridization.
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Affiliation(s)
- L Gamrad
- Technical Chemistry I and Center for Nanointegration Duisburg-Essen (CENIDE), Universitaetsstr. 7, 45141 Essen, Germany.
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23
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Tymoczko A, Kamp M, Prymak O, Rehbock C, Jakobi J, Schürmann U, Kienle L, Barcikowski S. How the crystal structure and phase segregation of Au-Fe alloy nanoparticles are ruled by the molar fraction and size. Nanoscale 2018; 10:16434-16437. [PMID: 30137113 DOI: 10.1039/c8nr03962c] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
The application of an Au-Fe nanoalloy is determined by its internal phase structure. Our experimental and theoretical findings explain how the prevalence of either a core-shell or a disordered solid solution structure is ruled by the target composition and the particle diameter. Furthermore, we found metastable phases not predefined by the bulk phase diagram.
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Affiliation(s)
- Anna Tymoczko
- Technical Chemistry I and Center for Nanointegration Duisburg-Essen (CENIDE), University Duisburg-Essen, Universitätstr. 7, 45141 Essen, Germany
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24
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Koenen S, Rehbock C, Heissler HE, Angelov SD, Schwabe K, Krauss JK, Barcikowski S. Optimizing in Vitro Impedance and Physico-Chemical Properties of Neural Electrodes by Electrophoretic Deposition of Pt Nanoparticles. Chemphyschem 2017; 18:1108-1117. [PMID: 28122149 DOI: 10.1002/cphc.201601180] [Citation(s) in RCA: 7] [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: 10/28/2016] [Indexed: 11/12/2022]
Abstract
Neural electrodes suffer from an undesired incline in impedance when in permanent contact with human tissue. Nanostructures, induced by electrophoretic deposition (EPD) of ligand-free laser-generated nanoparticles (NPs) on the electrodes are known to stabilize impedance in vivo. Hence, Pt surfaces were systematically EPD-coated with Pt NPs and evaluated for impedance as well as surface coverage, contact angle, electrochemically active surface area (ECSA) and surface oxidation. The aim was to establish a systematic correlation between EPD process parameters and physical surface properties. The findings clearly reveal a linear decrease in impedance with increasing surface coverage, which goes along with a proportional reduction of the contact angle and an increase in ECSA and surface oxidation. EPD process parameters, prone to yield surface coatings with low impedance, are long deposition times (40-60 min), while high colloid concentrations (>250 μg mL-1 ) and electric field strengths (>25 V cm-1 ) should be avoided due to detrimental NP assemblage effects.
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Affiliation(s)
- Sven Koenen
- Technical Chemistry I and, Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, Universitätsstrasse 7, 45141, Essen, Germany
| | - Christoph Rehbock
- Technical Chemistry I and, Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, Universitätsstrasse 7, 45141, Essen, Germany
| | - Hans E Heissler
- Department of Neurosurgery, Hannover Medical School, Carl-Neuberg-Str. 1, 30625, Hannover, Germany
| | - Svilen D Angelov
- Department of Neurosurgery, Hannover Medical School, Carl-Neuberg-Str. 1, 30625, Hannover, Germany
| | - Kerstin Schwabe
- Department of Neurosurgery, Hannover Medical School, Carl-Neuberg-Str. 1, 30625, Hannover, Germany
| | - Joachim K Krauss
- Department of Neurosurgery, Hannover Medical School, Carl-Neuberg-Str. 1, 30625, Hannover, Germany
| | - Stephan Barcikowski
- Technical Chemistry I and, Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, Universitätsstrasse 7, 45141, Essen, Germany
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25
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Kalus MR, Rehbock C, Bärsch N, Barcikowski S. Colloids created by light: Laser-generated nanoparticles for applications in biology and medicine. ACTA ACUST UNITED AC 2017. [DOI: 10.1016/j.matpr.2017.09.173] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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26
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Streich C, Akkari L, Decker C, Bormann J, Rehbock C, Müller-Schiffmann A, Niemeyer FC, Nagel-Steger L, Willbold D, Sacca B, Korth C, Schrader T, Barcikowski S. Characterizing the Effect of Multivalent Conjugates Composed of Aβ-Specific Ligands and Metal Nanoparticles on Neurotoxic Fibrillar Aggregation. ACS Nano 2016; 10:7582-7597. [PMID: 27404114 DOI: 10.1021/acsnano.6b02627] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [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: 06/06/2023]
Abstract
Therapeutically active small molecules represent promising nonimmunogenic alternatives to antibodies for specifically targeting disease-relevant receptors. However, a potential drawback compared to antibody-antigen interactions may be the lower affinity of small molecules toward receptors. Here, we overcome this low-affinity problem by coating the surface of nanoparticles (NPs) with multiple ligands. Specifically, we explored the use of gold and platinum nanoparticles to increase the binding affinity of Aβ-specific small molecules to inhibit Aβ peptide aggregation into fibrils in vitro. The interactions of bare NPs, free ligands, and NP-bound ligands with Aβ are comprehensively studied via physicochemical methods (spectroscopy, microscopy, immunologic tests) and cell assays. Reduction of thioflavin T fluorescence, as an indicator for β-sheet content, and inhibition of cellular Aβ excretion are even more effective with NP-bound ligands than with the free ligands. The results from this study may have implications in the development of therapeutics for treating Alzheimer's disease.
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Affiliation(s)
- Carmen Streich
- Technical Chemistry I and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen , 45141 Essen, Germany
| | - Laura Akkari
- Institute for Organic Chemistry, University of Duisburg-Essen , 45117 Essen, Germany
| | - Christina Decker
- Institut für Physikalische Biologie, Heinrich-Heine-University Düsseldorf , 40225 Düsseldorf, Germany
| | - Jenny Bormann
- Chemical Biology, Zentrum für Medizinische Biotechnologie (ZMB), Fakultät für Biologie, Universtität Duisburg-Essen , 45117 Essen, Germany
| | - Christoph Rehbock
- Technical Chemistry I and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen , 45141 Essen, Germany
| | | | | | - Luitgard Nagel-Steger
- Institut für Physikalische Biologie, Heinrich-Heine-University Düsseldorf , 40225 Düsseldorf, Germany
- Institute of Complex Systems, Structural Biochemistry (ICS-6), Research Centre Jülich , 52425 Jülich, Germany
| | - Dieter Willbold
- Institut für Physikalische Biologie, Heinrich-Heine-University Düsseldorf , 40225 Düsseldorf, Germany
- Institute of Complex Systems, Structural Biochemistry (ICS-6), Research Centre Jülich , 52425 Jülich, Germany
| | - Barbara Sacca
- Bionanotechnology, Zentrum für Medizinische Biotechnologie (ZMB), Fakultät für Biologie, University of Duisburg-Essen , 45117 Essen, Germany
| | - Carsten Korth
- Department Neuropathology, University of Düsseldorf Medical School , 40225 Düsseldorf, Germany
| | - Thomas Schrader
- Institute for Organic Chemistry, University of Duisburg-Essen , 45117 Essen, Germany
| | - Stephan Barcikowski
- Technical Chemistry I and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen , 45141 Essen, Germany
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27
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Gamrad L, Rehbock C, Westendorf AM, Buer J, Barcikowski S, Hansen W. Efficient nucleic acid delivery to murine regulatory T cells by gold nanoparticle conjugates. Sci Rep 2016; 6:28709. [PMID: 27381215 PMCID: PMC4933883 DOI: 10.1038/srep28709] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [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: 04/06/2016] [Accepted: 06/06/2016] [Indexed: 12/13/2022] Open
Abstract
Immune responses have to be tightly controlled to guarantee maintenance of immunological tolerance and efficient clearance of pathogens and tumorigenic cells without induction of unspecific side effects. CD4+ CD25+ regulatory T cells (Tregs) play an important role in these processes due to their immunosuppressive function. Genetic modification of Tregs would be helpful to understand which molecules and pathways are involved in their function, but currently available methods are limited by time, costs or efficacy. Here, we made use of biofunctionalized gold nanoparticles as non-viral carriers to transport genetic information into murine Tregs. Confocal microscopy and transmission electron microscopy revealed an efficient uptake of the bioconjugates by Tregs. Most importantly, coupling eGFP-siRNA to those particles resulted in a dose and time dependent reduction of up to 50% of eGFP expression in Tregs isolated from Foxp3eGFP reporter mice. Thus, gold particles represent a suitable carrier for efficient import of nucleic acids into murine CD4+ CD25+ Tregs, superior to electroporation.
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Affiliation(s)
- Lisa Gamrad
- Technical Chemistry I and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, Universitaetsstr. 7, 45141 Essen, Germany
| | - Christoph Rehbock
- Technical Chemistry I and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, Universitaetsstr. 7, 45141 Essen, Germany
| | - Astrid M Westendorf
- Institute of Medical Microbiology, University Hospital Essen, University Duisburg-Essen, Hufelandstr. 55, 45147 Essen, Germany
| | - Jan Buer
- Institute of Medical Microbiology, University Hospital Essen, University Duisburg-Essen, Hufelandstr. 55, 45147 Essen, Germany
| | - Stephan Barcikowski
- Technical Chemistry I and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, Universitaetsstr. 7, 45141 Essen, Germany
| | - Wiebke Hansen
- Institute of Medical Microbiology, University Hospital Essen, University Duisburg-Essen, Hufelandstr. 55, 45147 Essen, Germany
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28
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Rath D, Tiedemann D, Gamrad L, Johnson LA, Klein S, Kues W, Mancini R, Rehbock C, Taylor U, Barcikowski S. Sex-Sorted Boar Sperm - An Update on Related Production Methods. Reprod Domest Anim 2016; 50 Suppl 2:56-60. [PMID: 26174920 DOI: 10.1111/rda.12572] [Citation(s) in RCA: 12] [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] [Received: 05/18/2015] [Accepted: 05/20/2015] [Indexed: 01/13/2023]
Abstract
As in other mammals, sex sorting of pig sperm is based on quantitative flow cytometry. A major disadvantage of the technique is the relatively low efficiency to produce enough sorted sperm for artificial insemination. However, several approaches are on the way to make sexed pig sperm available for commercial application. In this context, for example, the growing field of nanotechnology may significantly contribute to these developments, as it provides highly efficient bio-nanoprobes, for example, based on plasmonic nanoparticles. Independent of the method, further development requires enormous investments and set-up of logistics to get the technology into the practical pig market. Only global players will be able to establish the necessary research projects, but in the end, a significant shift of sex ratios will be available for pig producers as it is already the case for the dairy industry.
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Affiliation(s)
- D Rath
- Institute of Farm Animal Genetics, Friedrich-Loeffler-Institut, Neustadt-Mariensee, Germany
| | - D Tiedemann
- Institute of Farm Animal Genetics, Friedrich-Loeffler-Institut, Neustadt-Mariensee, Germany
| | - L Gamrad
- Institute for Technical Chemistry I UDE, Essen, Germany.,CENIDE, Essen, Germany
| | | | - S Klein
- Institute of Farm Animal Genetics, Friedrich-Loeffler-Institut, Neustadt-Mariensee, Germany
| | - W Kues
- Institute of Farm Animal Genetics, Friedrich-Loeffler-Institut, Neustadt-Mariensee, Germany
| | - R Mancini
- Institute of Farm Animal Genetics, Friedrich-Loeffler-Institut, Neustadt-Mariensee, Germany
| | - C Rehbock
- Institute for Technical Chemistry I UDE, Essen, Germany.,CENIDE, Essen, Germany
| | - U Taylor
- Institute of Farm Animal Genetics, Friedrich-Loeffler-Institut, Neustadt-Mariensee, Germany
| | - S Barcikowski
- Institute for Technical Chemistry I UDE, Essen, Germany.,CENIDE, Essen, Germany
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29
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Simão T, Chevallier P, Lagueux J, Côté MF, Rehbock C, Barcikowski S, Fortin MA, Guay D. Laser-synthesized ligand-free Au nanoparticles for contrast agent applications in computed tomography and magnetic resonance imaging. J Mater Chem B 2016; 4:6413-6427. [DOI: 10.1039/c6tb01162d] [Citation(s) in RCA: 12] [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: 11/21/2022]
Abstract
Pulsed laser ablation in liquids (PLAL) has emerged as a new green chemistry method, advantageous to produce gold nanoparticles-based contrast agents with strong blood retention and for multimodal imaging.
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Affiliation(s)
- Teresa Simão
- Institut National de la Recherche Scientifique (INRS)
- Centre Énergie Matériaux Télécommunications
- Varennes (QC)
- Canada
| | - Pascale Chevallier
- Centre de Recherche du Centre Hospitalier Universitaire de Québec (CR-CHUQ)
- Axe Médecine Régénératrice
- Quebec City (QC)
- Canada
- Centre de Recherche sur les Matériaux Avancés (CERMA)
| | - Jean Lagueux
- Centre de Recherche du Centre Hospitalier Universitaire de Québec (CR-CHUQ)
- Axe Médecine Régénératrice
- Quebec City (QC)
- Canada
| | - Marie-France Côté
- Centre de Recherche du Centre Hospitalier Universitaire de Québec (CR-CHUQ)
- Axe Médecine Régénératrice
- Quebec City (QC)
- Canada
| | - Christoph Rehbock
- Technical Chemistry I
- University of Duisburg-Essen and Center for NanoIntegration Duisburg-Essen CENIDE
- 45141 Essen
- Germany
| | - Stephan Barcikowski
- Technical Chemistry I
- University of Duisburg-Essen and Center for NanoIntegration Duisburg-Essen CENIDE
- 45141 Essen
- Germany
| | - Marc-André Fortin
- Centre de Recherche du Centre Hospitalier Universitaire de Québec (CR-CHUQ)
- Axe Médecine Régénératrice
- Quebec City (QC)
- Canada
- Centre de Recherche sur les Matériaux Avancés (CERMA)
| | - Daniel Guay
- Institut National de la Recherche Scientifique (INRS)
- Centre Énergie Matériaux Télécommunications
- Varennes (QC)
- Canada
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Taylor U, Tiedemann D, Rehbock C, Kues WA, Barcikowski S, Rath D. Influence of gold, silver and gold-silver alloy nanoparticles on germ cell function and embryo development. Beilstein J Nanotechnol 2015; 6:651-664. [PMID: 25821705 PMCID: PMC4362334 DOI: 10.3762/bjnano.6.66] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/21/2014] [Accepted: 12/22/2014] [Indexed: 05/23/2023]
Abstract
The use of engineered nanoparticles has risen exponentially over the last decade. Applications are manifold and include utilisation in industrial goods as well as medical and consumer products. Gold and silver nanoparticles play an important role in the current increase of nanoparticle usage. However, our understanding concerning possible side effects of this increased exposure to particles, which are frequently in the same size regime as medium sized biomolecules and accessorily possess highly active surfaces, is still incomplete. That particularly applies to reproductive aspects, were defects can be passed onto following generations. This review gives a brief overview of the most recent findings concerning reprotoxicological effects. The here presented data elucidate how composition, size and surface modification of nanoparticles influence viablility and functionality of reproduction relevant cells derived from various animal models. While in vitro cultured embryos displayed no toxic effects after the microinjection of gold and silver nanoparticles, sperm fertility parameters deteriorated after co-incubation with ligand free gold nanoparticles. However, the effect could be alleviated by bio-coating the nanoparticles, which even applies to silver and silver-rich alloy nanoparticles. The most sensitive test system appeared to be in vitro oocyte maturation showing a dose-dependent response towards protein (BSA) coated gold-silver alloy and silver nanoparticles leading up to complete arrest of maturation. Recent biodistribution studies confirmed that nanoparticles gain access to the ovaries and also penetrate the blood-testis and placental barrier. Thus, the design of nanoparticles with increased biosafety is highly relevant for biomedical applications.
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Affiliation(s)
- Ulrike Taylor
- Institute of Farm Animal Genetics, Friedrich-Loeffler-Institut, Federal Research Institute of Animal Health, Hoeltystrasse 10, 31535 Mariensee, Germany
| | - Daniela Tiedemann
- Institute of Farm Animal Genetics, Friedrich-Loeffler-Institut, Federal Research Institute of Animal Health, Hoeltystrasse 10, 31535 Mariensee, Germany
| | - Christoph Rehbock
- Technical Chemistry I and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, Universitätsstrasse 7, 45141 Essen, Germany
| | - Wilfried A Kues
- Institute of Farm Animal Genetics, Friedrich-Loeffler-Institut, Federal Research Institute of Animal Health, Hoeltystrasse 10, 31535 Mariensee, Germany
| | - Stephan Barcikowski
- Technical Chemistry I and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, Universitätsstrasse 7, 45141 Essen, Germany
| | - Detlef Rath
- Institute of Farm Animal Genetics, Friedrich-Loeffler-Institut, Federal Research Institute of Animal Health, Hoeltystrasse 10, 31535 Mariensee, Germany
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Rath D, Barcikowski S, de Graaf S, Garrels W, Grossfeld R, Klein S, Knabe W, Knorr C, Kues W, Meyer H, Michl J, Moench-Tegeder G, Rehbock C, Taylor U, Washausen S. Sex selection of sperm in farm animals: status report and developmental prospects. Reproduction 2015; 149:X1. [DOI: 10.1530/rep-12-0151e] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Rehbock C, Jakobi J, Gamrad L, van der Meer S, Tiedemann D, Taylor U, Kues W, Rath D, Barcikowski S. Current state of laser synthesis of metal and alloy nanoparticles as ligand-free reference materials for nano-toxicological assays. Beilstein J Nanotechnol 2014; 5:1523-41. [PMID: 25247135 PMCID: PMC4168911 DOI: 10.3762/bjnano.5.165] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/12/2014] [Accepted: 08/07/2014] [Indexed: 05/15/2023]
Abstract
Due to the abundance of nanomaterials in medical devices and everyday products, toxicological effects related to nanoparticles released from these materials, e.g., by mechanical wear, are a growing matter of concern. Unfortunately, appropriate nanoparticles required for systematic toxicological evaluation of these materials are still lacking. Here, the ubiquitous presence of surface ligands, remaining from chemical synthesis are a major drawback as these organic residues may cause cross-contaminations in toxicological studies. Nanoparticles synthesized by pulsed laser ablation in liquid are a promising alternative as this synthesis route provides totally ligand-free nanoparticles. The first part of this article reviews recent methods that allow the size control of laser-fabricated nanoparticles, focusing on laser post irradiation, delayed bioconjugation and in situ size quenching by low salinity electrolytes. Subsequent or parallel applications of these methods enable precise tuning of the particle diameters in a regime from 4-400 nm without utilization of any artificial surface ligands. The second paragraph of this article highlights the recent progress concerning the synthesis of composition controlled alloy nanoparticles by laser ablation in liquids. Here, binary and ternary alloy nanoparticles with totally homogeneous elemental distribution could be fabricated and the composition of these particles closely resembled bulk implant material. Finally, the model AuAg was used to systematically evaluate composition related toxicological effects of alloy nanoparticles. Here Ag(+) ion release is identified as the most probable mechanism of toxicity when recent toxicological studies with gametes, mammalian cells and bacteria are considered.
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Affiliation(s)
- Christoph Rehbock
- Technical Chemistry I and Center for Nanointegration Duisburg-Essen (CENIDE), Universitaetsstr. 7, 45141 Essen, Germany
| | - Jurij Jakobi
- Technical Chemistry I and Center for Nanointegration Duisburg-Essen (CENIDE), Universitaetsstr. 7, 45141 Essen, Germany
| | - Lisa Gamrad
- Technical Chemistry I and Center for Nanointegration Duisburg-Essen (CENIDE), Universitaetsstr. 7, 45141 Essen, Germany
| | - Selina van der Meer
- Technical Chemistry I and Center for Nanointegration Duisburg-Essen (CENIDE), Universitaetsstr. 7, 45141 Essen, Germany
| | - Daniela Tiedemann
- Institute for Farm Animal Genetics, Friedrich-Loeffler-Institut, Höltystr. 10, 31535 Neustadt, Germany
| | - Ulrike Taylor
- Institute for Farm Animal Genetics, Friedrich-Loeffler-Institut, Höltystr. 10, 31535 Neustadt, Germany
| | - Wilfried Kues
- Institute for Farm Animal Genetics, Friedrich-Loeffler-Institut, Höltystr. 10, 31535 Neustadt, Germany
| | - Detlef Rath
- Institute for Farm Animal Genetics, Friedrich-Loeffler-Institut, Höltystr. 10, 31535 Neustadt, Germany
| | - Stephan Barcikowski
- Technical Chemistry I and Center for Nanointegration Duisburg-Essen (CENIDE), Universitaetsstr. 7, 45141 Essen, Germany
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Rehbock C, Zwartscholten J, Barcikowski S. Biocompatible Gold Submicrometer Spheres with Variable Surface Texture Fabricated by Pulsed Laser Melting in Liquid. CHEM LETT 2014. [DOI: 10.1246/cl.140455] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Affiliation(s)
- Christoph Rehbock
- Technical Chemistry I, University of Duisburg-Essen and Center for Nanointegration Duisburg-Essen CENIDE
| | - Janina Zwartscholten
- Technical Chemistry I, University of Duisburg-Essen and Center for Nanointegration Duisburg-Essen CENIDE
| | - Stephan Barcikowski
- Technical Chemistry I, University of Duisburg-Essen and Center for Nanointegration Duisburg-Essen CENIDE
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Taylor U, Rehbock C, Streich C, Rath D, Barcikowski S. Rational design of gold nanoparticle toxicology assays: a question of exposure scenario, dose and experimental setup. Nanomedicine (Lond) 2014; 9:1971-89. [DOI: 10.2217/nnm.14.139] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Many studies have evaluated the toxicity of gold nanoparticles, although reliable predictions based on these results are rare. In order to overcome this problem, this article highlights strategies to improve comparability and standardization of nanotoxicological studies. To this end, it is proposed that we should adapt the nanomaterial to the addressed exposure scenario, using ligand-free nanoparticle references in order to differentiate ligand effects from size effects. Furthermore, surface-weighted particle dosing referenced to the biologically relevant parameter (e.g., cell number or organ mass) is proposed as the gold standard. In addition, it is recommended that we should shift the focus of toxicological experiments from ‘live–dead’ assays to the assessment of cell function, as this strategy allows observation of bioresponses at lower doses that are more relevant for in vivo scenarios.
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Affiliation(s)
- Ulrike Taylor
- Institute of Farm Animal Genetics, Friedrich-Löffler-Institut, Federal Research Institute of Animal Health, Höltystraße 10, 31535 Mariensee, Germany
| | - Christoph Rehbock
- Technical Chemistry I & Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, Universitätsstraße 7, 45141 Essen, Germany
| | - Carmen Streich
- Technical Chemistry I & Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, Universitätsstraße 7, 45141 Essen, Germany
| | - Detlef Rath
- Institute of Farm Animal Genetics, Friedrich-Löffler-Institut, Federal Research Institute of Animal Health, Höltystraße 10, 31535 Mariensee, Germany
| | - Stephan Barcikowski
- Technical Chemistry I & Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, Universitätsstraße 7, 45141 Essen, Germany
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Pfeiffer C, Rehbock C, Hühn D, Carrillo-Carrion C, de Aberasturi DJ, Merk V, Barcikowski S, Parak WJ. Interaction of colloidal nanoparticles with their local environment: the (ionic) nanoenvironment around nanoparticles is different from bulk and determines the physico-chemical properties of the nanoparticles. J R Soc Interface 2014; 11:20130931. [PMID: 24759541 PMCID: PMC4032524 DOI: 10.1098/rsif.2013.0931] [Citation(s) in RCA: 202] [Impact Index Per Article: 20.2] [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: 10/11/2013] [Accepted: 11/27/2013] [Indexed: 12/22/2022] Open
Abstract
The physico-chemical properties of colloidal nanoparticles (NPs) are influenced by their local environment, as, in turn, the local environment influences the physico-chemical properties of the NPs. In other words, the local environment around NPs has a profound impact on the NPs, and it is different from bulk due to interaction with the NP surface. So far, this important effect has not been addressed in a comprehensive way in the literature. The vicinity of NPs can be sensitively influenced by local ions and ligands, with effects already occurring at extremely low concentrations. NPs in the Hückel regime are more sensitive to fluctuations in the ionic environment, because of a larger Debye length. The local ion concentration hereby affects the colloidal stability of the NPs, as it is different from bulk owing to Debye Hückel screening caused by the charge of the NPs. This can have subtle effects, now caused by the environment to the performance of the NP, such as for example a buffering effect caused by surface reaction on ultrapure ligand-free nanogold, a size quenching effect in the presence of specific ions and a significant impact on fluorophore-labelled NPs acting as ion sensors. Thus, the aim of this review is to clarify and give an unifying view of the complex interplay between the NP's surface with their nanoenvironment.
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Affiliation(s)
| | - Christoph Rehbock
- Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, Essen, Germany
| | - Dominik Hühn
- Fachbereich Physik, Philipps Universität Marburg, Marburg, Germany
| | | | | | - Vivian Merk
- Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, Essen, Germany
| | - Stephan Barcikowski
- Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, Essen, Germany
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Merk V, Rehbock C, Becker F, Hagemann U, Nienhaus H, Barcikowski S. In situ non-DLVO stabilization of surfactant-free, plasmonic gold nanoparticles: effect of Hofmeister's anions. Langmuir 2014; 30:4213-22. [PMID: 24720469 DOI: 10.1021/la404556a] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Specific ion effects ranking in the Hofmeister sequence are ubiquitous in biochemical, industrial, and atmospheric processes. In this experimental study specific ion effects inexplicable by the classical DLVO theory have been investigated at curved water-metal interfaces of gold nanoparticles synthesized by a laser ablation process in liquid in the absence of any organic stabilizers. Notably, ion-specific differences in colloidal stability occurred in the Hückel regime at extraordinarily low salinities below 50 μM, and indications of a direct influence of ion-specific effects on the nanoparticle formation process are found. UV-vis, zeta potential, and XPS measurements help to elucidate coagulation properties, electrokinetic potential, and the oxidation state of pristine gold nanoparticles. The results clearly demonstrate that stabilization of ligand-free gold nanoparticles scales proportionally with polarizability and antiproportionally with hydration of anions located at defined positions in a direct Hofmeister sequence of anions. These specific ion effects might be due to the adsorption of chaotropic anions (Br(-), SCN(-), or I(-)) at the gold/water interface, leading to repulsive interactions between the partially oxidized gold particles during the nanoparticle formation process. On the other hand, kosmotropic anions (F(-) or SO4(2-)) seem to destabilize the gold colloid, whereas Cl(-) and NO3(-) give rise to an intermediate stability. Quantification of surface charge density indicated that particle stabilization is dominated by ion adsorption and not by surface oxidation. Fundamental insights into specific ion effects on ligand-free aqueous gold nanoparticles beyond purely electrostatic interactions are of paramount importance in biomedical or catalytic applications, since colloidal stability appears to depend greatly on the type of salt rather than on the amount.
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Affiliation(s)
- Vivian Merk
- Technical Chemistry I, University of Duisburg-Essen and Center for NanoIntegration Duisburg-Essen CENIDE , Universtitaetsstrasse 5, 45141 Essen, Germany
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Tiedemann D, Taylor U, Rehbock C, Jakobi J, Klein S, Kues WA, Barcikowski S, Rath D. Reprotoxicity of gold, silver, and gold–silver alloy nanoparticles on mammalian gametes. Analyst 2014; 139:931-42. [DOI: 10.1039/c3an01463k] [Citation(s) in RCA: 126] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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Neumeister A, Jakobi J, Rehbock C, Moysig J, Barcikowski S. Monophasic ligand-free alloy nanoparticle synthesis determinants during pulsed laser ablation of bulk alloy and consolidated microparticles in water. Phys Chem Chem Phys 2014; 16:23671-8. [DOI: 10.1039/c4cp03316g] [Citation(s) in RCA: 90] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
Laser ablation in liquids yields solid solution alloy nanoparticles, where alloy formation is caused by ablation and not by post-irradiation of colloidal nanoparticles.
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Affiliation(s)
- Anne Neumeister
- Technical Chemistry I
- University of Duisburg-Essen and Center for NanoIntegration Duisburg-Essen CENIDE
- 45141 Essen, Germany
| | - Jurij Jakobi
- Technical Chemistry I
- University of Duisburg-Essen and Center for NanoIntegration Duisburg-Essen CENIDE
- 45141 Essen, Germany
| | - Christoph Rehbock
- Technical Chemistry I
- University of Duisburg-Essen and Center for NanoIntegration Duisburg-Essen CENIDE
- 45141 Essen, Germany
| | - Janine Moysig
- Technical Chemistry I
- University of Duisburg-Essen and Center for NanoIntegration Duisburg-Essen CENIDE
- 45141 Essen, Germany
| | - Stephan Barcikowski
- Technical Chemistry I
- University of Duisburg-Essen and Center for NanoIntegration Duisburg-Essen CENIDE
- 45141 Essen, Germany
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Rehbock C, Merk V, Gamrad L, Streubel R, Barcikowski S. Size control of laser-fabricated surfactant-free gold nanoparticles with highly diluted electrolytes and their subsequent bioconjugation. Phys Chem Chem Phys 2013; 15:3057-67. [PMID: 23132176 DOI: 10.1039/c2cp42641b] [Citation(s) in RCA: 138] [Impact Index Per Article: 12.5] [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
Size control of laser-fabricated surfactant-free gold nanoparticles is a challenging endeavor. In this work, we show that size control can be achieved by adding ions with low salinity during synthesis. In addition, this approach offers the opportunity to fundamentally study ion interactions with bare nanoparticle surfaces and can help to elucidate the nanoparticle formation mechanism. The studies were carried out in a flow-through reactor and in the presence of NaCl, NaBr and sodium phosphate buffer at minimal ionic strengths. A significant size quenching effect at ionic strengths from 1-50 μM was found, which allowed surfactant-free nanoparticle size control with average diameters of 6-30 nm. This effect went along with low polydispersity and minimal aggregation tendencies and was confirmed by UV-vis spectroscopy, TEM, SEM and analytical disk centrifugation. Our findings indicate that size quenching originates from an anionic electrostatic stabilization depending on the nanoparticle surface area, which may be caused by specific ion adsorption. By subsequent delayed bioconjugation in liquid-flow using bovine serum albumin as a stabilizing agent, nano-bioconjugates with good stability in cell culture media were obtained, which are applicable in toxicology and cell biology.
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Affiliation(s)
- Christoph Rehbock
- Technical Chemistry I, University of Duisburg-Essen and Center for NanoIntegration Duisburg-Essen CENIDE, Universtitaetsstrasse 7, 45141 Essen, Germany
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Rath D, Barcikowski S, de Graaf S, Garrels W, Grossfeld R, Klein S, Knabe W, Knorr C, Kues W, Meyer H, Michl J, Moench-Tegeder G, Rehbock C, Taylor U, Washausen S. Sex selection of sperm in farm animals: status report and developmental prospects. Reproduction 2013; 145:R15-30. [DOI: 10.1530/rep-12-0151] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Pre-selection of spermatozoa based on the relative DNA difference between X- and Y-chromosome bearing populations by flow cytometry is an established method that has been introduced into commercial cattle production. Although several important improvements have increased the sort efficiency, the fertilising ability of sexed spermatozoa based on offspring per insemination is still behind farmers' expectations. The main stress factors, especially on mitochondria, that reduce the lifespan of spermatozoa are described, and new technical as well as biological solutions to maintain the natural sperm integrity and to increase the sorting efficiency are discussed. Among these methods are the identification of Y-chromosome bearing spermatozoa by bi-functionalised gold nanoparticles and triplex hybridisationin vivoas well as new laser-controlled deflection system that replaces the deflection of spermatozoa in the electrostatic field. Additionally, as well as a new nonsurgical transfer system of spermatozoa into the oviduct of cows has been developed and allows a significant reduction of spermatozoa per transfer. Altogether, the improvements made in the recent years will allow a broader use of sex-sorted spermatozoa even in those species that require more cells than cows and sheep.
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Barcikowski S, Rehbock C, Taylor U, Kues W, Rath D. Durchflussreaktor zur Synthese von Nanopartikel-Biokonjugaten für die Reproduktionsbiologie. CHEM-ING-TECH 2012. [DOI: 10.1002/cite.201250040] [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: 11/07/2022]
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Rehbock C, Riechers D, Höpfner T, Bluma A, Lindner P, Hitzmann B, Beutel S, Scheper T. Development of a flow-through microscopic multitesting system for parallel monitoring of cell samples in biotechnological cultivation processes. J Biotechnol 2010; 150:87-93. [DOI: 10.1016/j.jbiotec.2010.07.014] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2009] [Revised: 07/07/2010] [Accepted: 07/08/2010] [Indexed: 11/25/2022]
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Bluma A, Höpfner T, Lindner P, Rehbock C, Beutel S, Riechers D, Hitzmann B, Scheper T. In-situ imaging sensors for bioprocess monitoring: state of the art. Anal Bioanal Chem 2010; 398:2429-38. [DOI: 10.1007/s00216-010-4181-y] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2010] [Revised: 08/24/2010] [Accepted: 08/30/2010] [Indexed: 11/28/2022]
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Bluma A, Höpfner T, Lindner P, Rehbock C, Beutel S, Scheper T. Prozessanalytische In-situ-Sonden zur Inline-Charakterisierung dispergierter Partikel. CHEM-ING-TECH 2010. [DOI: 10.1002/cite.200900158] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Glindkamp A, Riechers D, Rehbock C, Hitzmann B, Scheper T, Reardon KF. Sensors in Disposable Bioreactors Status and Trends. Disposable Bioreactors 2009; 115:145-69. [DOI: 10.1007/10_2009_10] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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de Mey C, Meineke I, Enterling D, Rehbock C, Osterwald H. Transdermal delivery of mepindolol and propranolol in normal man. 2nd communication: pharmacokinetic and neuro-endocrine aspects. Arzneimittelforschung 1989; 39:1508-12. [PMID: 2576201] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
The plasma and urinary pharmacokinetics of mepindolol and propranolol were assessed in nine healthy volunteers after single and 1-week daily repeated application of the drugs by a novel transdermal delivery system (BIO TSD). Qualitatively, the time courses of the plasma concentrations for both compounds were similar and indicative of effective drug input. On the first day of the treatment courses plasma levels rose slowly, reaching their observed maximum after 24 h. The latter still was in the rising phase of the curve and further input on longer application is likely. After 1 week daily repeated application apparent steady state conditions were reached. The plasma concentrations were low in comparison to the levels reported for oral dosing. Only small amounts of unchanged drug were excreted via urine. The effects of the investigational treatments on supine-resting and stimulated neuroendocrine variables were assessed also. A blunting of the adrenaline response to delayed auditory feed-back mental stress testing (DAF) was consistently observed after propranolol, but not after mepindolol. Noradrenaline responses to DAF were not altered. No consistent effects were observed in terms of the adrenaline responses to 3 min isometric handgrip testing (IHG). Noradrenaline responses to IHG were slightly blunted, relative to placebo on the first day when propranolol and mepindolol were applied. This was probably related to the usually high responses to placebo as reference. At the end of 1 week repeated application of the patches mean supine resting plasma renin activity (PRA) was significantly reduced by propranolol but not by mepindolol, and the mean PRA responses to 5 min i.v. infusion of isoprenaline was reduced by both.
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Affiliation(s)
- C de Mey
- SK&F-Institute for Applied Clinical Pharmacology, Göttingen, Fed. Republic of Germany
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48
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Heimpel H, Rehbock C, van Eimeren W. [Course and prognosis of panmyelopathy and isolated aplastic anemia. Retrospective study in 70 patients]. Blut 1975; 30:235-54. [PMID: 1125432 DOI: 10.1007/bf01635356] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
From 1967 to 1972, 70 patients with aplastic anemia were observed and followed up to death or at least two years. 3 cases of pure red cell anemia, and 2 cases of amegakaryocytic thrombocytopenia are included. Detailed investigation of drugs taken within 6 months before onset of the disease revealed chloramphenicol in 20, butazones in 11 cases. Acute viral hepatitis preceded the hemopoietic failure in 2 patients. In addition to various combinations of anemia, granulocytopenia and thrombocytopenia, monocytes were diminished in 35 and lymphocytes in 12 cases. Acid serum or sucrose tests were consistently negative. The patients were treated by short-term prednisone, long-term androgens and red cell and platelet substitution as needed. 2 years after onset of the disease, 33 per cent were in partial or complete remission, 30 per cent survived without remission, and 35 per cent had decreased. Correlation of various parameters with remission and survival showed the presence of a subgroup at risque, comprising patients with low marrow cellularity and clinically relevant diminution of all three cell lines at the time of diagnosis. Absolute lymphopenia and increase of plasma cells in the bone marrow were of poor prognostic significance. In this subgroup two years after the onset of the disease only 32 percent survivors and 16 per cent remissions were recorded. There was no conclusive evidence for the therapeutic value of prednisone or androgens in our series. The present situation in severe aplastic anemia requires more effective forms of treatment and justifies experimental therapies like bone marrow transplantation.
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