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Motay M, Martel D, Vileno B, Soraru C, Ploux L, Méndez-Medrano MG, Colbeau-Justin C, Decher G, Keller N. Virtually Transparent TiO 2/Polyelectrolyte Thin Multilayer Films as High-Efficiency Nanoporous Photocatalytic Coatings for Breaking Down Formic Acid and for Escherichia coli Removal. ACS APPLIED MATERIALS & INTERFACES 2020; 12:55766-55781. [PMID: 33284584 DOI: 10.1021/acsami.0c13545] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Virtually transparent photocatalytic multilayer films composed of TiO2 nanoparticles and polyelectrolytes were built on model surfaces using layer-by-layer assembly and investigated as photocatalytic nanoporous coatings. Formic acid (HCOOH) and Escherichia coli were used as models for the degradation of gaseous pollutants and for studying antibacterial properties. Positively charged TiO2 nanoparticles were coassembled with negatively charged poly(sodium 4-styrenesulfonate) (NaPSS) which leads to highly transparent nanoscale coatings in which the content of TiO2 particles is controlled mainly by the number of deposition cycles and the enhanced translucency with respect to titania powders is likely due to the presence of the polyelectrolytes in the interstitial space between the particles. Build-up and structural properties of the films were determined by ellipsometry, quartz crystal microbalance (QCM-D, with dissipation monitoring), and UV-vis spectrophotometry in transmission and scanning electron microscopy. Complementary photophysical and activity tests of (PSS/TiO2)n multilayer films were performed in the gas-phase under UV-A light and revealed a peculiar dependence on the number of layer pairs (LPs), corresponding to a clear deviation from the usual observations in photocatalysis with increasing TiO2 amounts. Most notably, a single LP film showed a strongly enhanced HCOOH mineralization and outperformed films with a higher number of LPs, with respect to the quantity of TiO2 catalyst present in the films. It is believed that the high quantum yield (8.1%) of a coating consisting of a single TiO2 layer which is 6-7 times higher than that of a 6-10 LP film could be due to the optimum accessibility of the TiO2 crystallites toward both HCOOH and water molecules. In thicker films, while no detrimental light screening was observed with increasing the number of LPs, diffusion phenomena could cap the efficiency of the access of the pollutant and water to the catalytic surface. Unlike for HCOOH mineralization, three PSS/TiO2 LPs were required for observing a maximum antibacterial activity of the nanocomposite coatings. This is likely due to the fact that micrometer-sized E. coli bacteria do not enter into the interstitial space between the TiO2 particles and require a different surface morphology with respect to the number of active contact points for optimum degradation.
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Affiliation(s)
- Marvin Motay
- Institut de Chimie et Procédés pour l'Energie, l'Environnement et la Santé (ICPEES, CNRS, Université de Strasbourg), 25 rue Becquerel, 67087 Strasbourg, France
- Institut Charles Sadron (UPR 22), CNRS, Université de Strasbourg, 23 rue de Loess, Strasbourg CEDEX 2 67034, France
| | - David Martel
- Institut Charles Sadron (UPR 22), CNRS, Université de Strasbourg, 23 rue de Loess, Strasbourg CEDEX 2 67034, France
| | - Bertrand Vileno
- Institut de Chimie, CNRS, Université de Strasbourg, CNRS, 1 rue Blaise Pascal, Strasbourg CEDEX 67008, France
| | - Charline Soraru
- Institut de Science des Matériaux de Mulhouse (IS2M, UMR7361 CNRS/Université de Haute Alsace), 15 rue Jean Starcky, 68057 Mulhouse, France
| | - Lydie Ploux
- Institut de Science des Matériaux de Mulhouse (IS2M, UMR7361 CNRS/Université de Haute Alsace), 15 rue Jean Starcky, 68057 Mulhouse, France
- Biomaterial Bioengineering (U1121 INSERM/Université de Strasbourg), 11 rue Humann, 67000 Strasbourg, France
| | | | | | - Gero Decher
- Institut Charles Sadron (UPR 22), CNRS, Université de Strasbourg, 23 rue de Loess, Strasbourg CEDEX 2 67034, France
| | - Nicolas Keller
- Institut de Chimie et Procédés pour l'Energie, l'Environnement et la Santé (ICPEES, CNRS, Université de Strasbourg), 25 rue Becquerel, 67087 Strasbourg, France
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Smerkova K, Dolezelikova K, Bozdechova L, Heger Z, Zurek L, Adam V. Nanomaterials with active targeting as advanced antimicrobials. WILEY INTERDISCIPLINARY REVIEWS-NANOMEDICINE AND NANOBIOTECHNOLOGY 2020; 12:e1636. [PMID: 32363802 DOI: 10.1002/wnan.1636] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/20/2019] [Revised: 03/30/2020] [Accepted: 03/31/2020] [Indexed: 12/19/2022]
Abstract
With a growing health threat of bacterial resistance to antibiotics, the nanomaterials have been extensively studied as an alternative. It is assumed that antimicrobial nanomaterials can affect bacteria by several mechanisms simultaneously and thereby overcome antibiotic resistance. Another promising potential use is employing nanomaterials as nanocarriers for antibiotics in order to overcome bacterial defense mechanisms. The passive targeting of nanomaterials is the often used strategy for bacterial treatment, including intracellular infections of macrophages. Furthermore, the specific targeting enhances the efficacy of antimicrobials and reduces side effects. This review aims to discuss advantages, disadvantages, and challenges of nanomaterials in the context of the targeting strategies for antimicrobials as advanced tools for treatments of bacterial infections. This article is categorized under: Therapeutic Approaches and Drug Discovery > Nanomedicine for Infectious Disease.
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Affiliation(s)
- Kristyna Smerkova
- Department of Chemistry and Biochemistry, Mendel University in Brno, Brno, Czech Republic.,Central European Institute of Technology, Brno University of Technology, Brno, Czech Republic
| | - Kristyna Dolezelikova
- Department of Chemistry and Biochemistry, Mendel University in Brno, Brno, Czech Republic.,Central European Institute of Technology, Brno University of Technology, Brno, Czech Republic
| | - Lucie Bozdechova
- Department of Chemistry and Biochemistry, Mendel University in Brno, Brno, Czech Republic.,Central European Institute of Technology, Brno University of Technology, Brno, Czech Republic
| | - Zbynek Heger
- Department of Chemistry and Biochemistry, Mendel University in Brno, Brno, Czech Republic.,Central European Institute of Technology, Brno University of Technology, Brno, Czech Republic
| | - Ludek Zurek
- Department of Chemistry and Biochemistry, Mendel University in Brno, Brno, Czech Republic.,Central European Institute of Technology, Center for Zoonoses, University of Veterinary and Pharmaceutical Sciences, Brno, Czech Republic
| | - Vojtech Adam
- Department of Chemistry and Biochemistry, Mendel University in Brno, Brno, Czech Republic.,Central European Institute of Technology, Brno University of Technology, Brno, Czech Republic
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Oh YJ, Khan ES, Campo AD, Hinterdorfer P, Li B. Nanoscale Characteristics and Antimicrobial Properties of (SI-ATRP)-Seeded Polymer Brush Surfaces. ACS APPLIED MATERIALS & INTERFACES 2019; 11:29312-29319. [PMID: 31259525 DOI: 10.1021/acsami.9b09885] [Citation(s) in RCA: 34] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
Microbial resistant coatings have raised considerable interest in the biotechnological industry and clinical scenarios to combat the spreading of infections, in particular in implanted medical devices. Polymer brushes covalently attached to surfaces represent a useful platform to identify ideal compositions for preventing bacterial settlement by quantifying bacteria-surface interactions. In this work, a series of polymer brushes with different charges, positively charged poly[2-(methacryloyloxy)ethyl trimethylammonium chloride] (PMETAC), negatively charged poly(3-sulfopropyl methacrylate potassium salt) (PSPMA), and neutral poly(2-hydroxyethyl methacrylate) (PHEMA) were grafted onto glass surfaces by surface-initiated atom transfer radical polymerization in aqueous conditions. The antimicrobial activity of the polymer brushes against Gram-negative Escherichia coli was tested at the nano- and microscopic level on different time scales, that is, from nm to 100 μm, and ms to 24 h, respectively. The interaction between the polymer brushes and E. coli was studied by single-cell force spectroscopy (SCFS) and by quantification of the bacterial density on surfaces incubated with bacterial suspensions. E. coli firmly attached to positive PMETAC brushes with high work required for de-adhesion of 28 ± 9 nN·nm, but did not significantly bind to negatively charged PSPMA and neutral PHEMA brushes. Our studies of bacterial adhesion using polymer brushes with controllable chemistry provide essential insights into bacterial surface interactions and the origins of bacterial adhesion.
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Affiliation(s)
- Yoo Jin Oh
- Institute of Biophysics , Johannes Kepler University Linz , Gruberstrasse 40 , A-4020 Linz , Austria
| | - Essak S Khan
- INM-Leibniz Institute for New Materials , Campus D2.2 , 66123 Saarbrücken , Germany
- Chemistry Department , Saarland University , 66123 Saarbrücken , Germany
| | - Aránzazu Del Campo
- INM-Leibniz Institute for New Materials , Campus D2.2 , 66123 Saarbrücken , Germany
- Chemistry Department , Saarland University , 66123 Saarbrücken , Germany
| | - Peter Hinterdorfer
- Institute of Biophysics , Johannes Kepler University Linz , Gruberstrasse 40 , A-4020 Linz , Austria
| | - Bin Li
- INM-Leibniz Institute for New Materials , Campus D2.2 , 66123 Saarbrücken , Germany
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Oh JK, Yegin Y, Yang F, Zhang M, Li J, Huang S, Verkhoturov SV, Schweikert EA, Perez-Lewis K, Scholar EA, Taylor TM, Castillo A, Cisneros-Zevallos L, Min Y, Akbulut M. The influence of surface chemistry on the kinetics and thermodynamics of bacterial adhesion. Sci Rep 2018; 8:17247. [PMID: 30467352 PMCID: PMC6250697 DOI: 10.1038/s41598-018-35343-1] [Citation(s) in RCA: 82] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2018] [Accepted: 10/29/2018] [Indexed: 11/29/2022] Open
Abstract
This work is concerned with investigating the effect of substrate hydrophobicity and zeta potential on the dynamics and kinetics of the initial stages of bacterial adhesion. For this purpose, bacterial pathogens Staphylococcus aureus and Escherichia coli O157:H7 were inoculated on the substrates coated with thin thiol layers (i.e., 1-octanethiol, 1-decanethiol, 1-octadecanethiol, 16-mercaptohexadecanoic acid, and 2-aminoethanethiol hydrochloride) with varying hydrophobicity and surface potential. The time-resolved adhesion data revealed a transformation from an exponential dependence to a square root dependence on time upon changing the substrate from hydrophobic or hydrophilic with a negative zeta potential value to hydrophilic with a negative zeta potential for both pathogens. The dewetting of extracellular polymeric substances (EPS) produced by E. coli O157:H7 was more noticeable on hydrophobic substrates, compared to that of S. aureus, which is attributed to the more amphiphilic nature of staphylococcal EPS. The interplay between the timescale of EPS dewetting and the inverse of the adhesion rate constant modulated the distribution of E. coli O157:H7 within microcolonies and the resultant microcolonial morphology on hydrophobic substrates. Observed trends in the formation of bacterial monolayers rather than multilayers and microcolonies rather than isolated and evenly spaced bacterial cells could be explained by a colloidal model considering van der Waals and electrostatic double-layer interactions only after introducing the contribution of elastic energy due to adhesion-induced deformations at intercellular and substrate-cell interfaces. The gained knowledge is significant in the context of identifying surfaces with greater risk of bacterial contamination and guiding the development of novel surfaces and coatings with superior bacterial antifouling characteristics.
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Affiliation(s)
- Jun Kyun Oh
- Artie McFerrin Department of Chemical Engineering, Texas A&M University, College Station, Texas, 77843, USA
| | - Yagmur Yegin
- Department of Nutrition and Food Science, Texas A&M University, College Station, Texas, 77843, USA
| | - Fan Yang
- Department of Chemistry, Texas A&M University, College Station, Texas, 77843, USA
| | - Ming Zhang
- Department of Polymer Engineering, University of Akron, Akron, Ohio, 44325, USA
| | - Jingyu Li
- Department of Polymer Engineering, University of Akron, Akron, Ohio, 44325, USA
| | - Shifeng Huang
- Department of Polymer Engineering, University of Akron, Akron, Ohio, 44325, USA
| | | | - Emile A Schweikert
- Department of Chemistry, Texas A&M University, College Station, Texas, 77843, USA
| | - Keila Perez-Lewis
- Department of Animal Science, Texas A&M University, College Station, Texas, 77843, USA
| | - Ethan A Scholar
- Artie McFerrin Department of Chemical Engineering, Texas A&M University, College Station, Texas, 77843, USA
| | - T Matthew Taylor
- Department of Animal Science, Texas A&M University, College Station, Texas, 77843, USA
| | - Alejandro Castillo
- Department of Animal Science, Texas A&M University, College Station, Texas, 77843, USA
| | - Luis Cisneros-Zevallos
- Department of Horticultural Sciences, Texas A&M University, College Station, Texas, 77843, USA
| | - Younjin Min
- Department of Polymer Engineering, University of Akron, Akron, Ohio, 44325, USA.
| | - Mustafa Akbulut
- Artie McFerrin Department of Chemical Engineering, Texas A&M University, College Station, Texas, 77843, USA.
- Department of Materials Science and Engineering, Texas A&M University, College Station, Texas, 77843, USA.
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LapF and Its Regulation by Fis Affect the Cell Surface Hydrophobicity of Pseudomonas putida. PLoS One 2016; 11:e0166078. [PMID: 27812186 PMCID: PMC5094663 DOI: 10.1371/journal.pone.0166078] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2016] [Accepted: 10/21/2016] [Indexed: 11/19/2022] Open
Abstract
The ability of bacteria to regulate cell surface hydrophobicity is important for the adaptation to different environmental conditions. The hydrophobicity of cell surface can be determined by several factors, including outer membrane and surface proteins. In this study, we report that an adhesin LapF influences cell surface hydrophobicity of Pseudomonas putida. Cells lacking LapF are less hydrophobic than wild-type cells in stationary growth phase. Moreover, the overexpression of the global regulator Fis decreases surface hydrophobicity by repressing the expression of lapF. Flow cytometry analysis revealed that bacteria producing LapF are more viable when confronted with methanol (a hydrophilic compound) but are more susceptible to 1-octanol (a hydrophobic compound). Thus, these results revealed that LapF is the hydrophobicity factor for the cell surface of P. putida.
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Barros J, Grenho L, Manuel CM, Ferreira C, Melo L, Nunes OC, Monteiro FJ, Ferraz MP. Influence of nanohydroxyapatite surface properties on Staphylococcus epidermidis biofilm formation. J Biomater Appl 2013; 28:1325-35. [DOI: 10.1177/0885328213507300] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Nanohydroxyapatite (nanoHA), due to its chemical properties, has appeared as an exceptionally promising bioceramic to be used as bone regeneration material. Staphylococcus epidermidis have emerged as major nosocomial pathogens associated with infections of implanted medical devices. In this work, the purpose was to study the influence of the nanoHA surface characteristics on S. epidermidis RP62A biofilm formation. Therefore, two different initial inoculum concentrations (Ci) were used in order to check if these would affect the biofilm formed on the nanoHA surfaces. Biofilm formation was followed by the enumeration of cultivable cells and by scanning electron microscopy. Surface topography, contact angle, total surface area and porosimetry of the biomaterials were studied and correlated with the biofilm data. The surface of nanoHA sintered at 830℃ (nanoHA830) showed to be more resistant to S. epidermidis attachment and accumulation than that of nanoHA sintered at 1000℃ (nanoHA1000). The biofilm formed on nanoHA830 presented differences in terms of structure, surface coverage and EPS production when compared to the one formed on nanoHA1000 surface. It was observed that topography and surface area of nanoHA surfaces had influence on the bacterial attachment and accumulation. Ci influenced bacteria attachment and accumulation on nanoHA surfaces over time. The choice of the initial inoculum concentration was relevant proving to have an effect on the extent of adherence thus being a critical point for human health if these materials are used in implantable devices. This study showed that the initial inoculum concentration and surface material properties determine the rate of microbial attachment to substrata and consequently are related to biofilm-associated infections in biomaterials.
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Affiliation(s)
- J Barros
- INEB – Instituto de Engenharia Biomédica, Universidade do Porto, Porto, Portugal
- Departamento de Engenharia Metalúrgica e Materiais, FEUP – Faculdade de Engenharia – Universidade do Porto, Porto, Portugal
- LEPAE – Laboratório de Engenharia dos Processos, Ambiente e Energia, Departamento de Engenharia Química, Faculdade de Engenharia – Universidade do Porto, Porto, Portugal
| | - L Grenho
- INEB – Instituto de Engenharia Biomédica, Universidade do Porto, Porto, Portugal
- Departamento de Engenharia Metalúrgica e Materiais, FEUP – Faculdade de Engenharia – Universidade do Porto, Porto, Portugal
| | - CM Manuel
- LEPAE – Laboratório de Engenharia dos Processos, Ambiente e Energia, Departamento de Engenharia Química, Faculdade de Engenharia – Universidade do Porto, Porto, Portugal
- ULP – Universidade Lusófona do Porto, Porto, Portugal
| | - C Ferreira
- LEPAE – Laboratório de Engenharia dos Processos, Ambiente e Energia, Departamento de Engenharia Química, Faculdade de Engenharia – Universidade do Porto, Porto, Portugal
| | - L Melo
- LEPAE – Laboratório de Engenharia dos Processos, Ambiente e Energia, Departamento de Engenharia Química, Faculdade de Engenharia – Universidade do Porto, Porto, Portugal
| | - OC Nunes
- LEPAE – Laboratório de Engenharia dos Processos, Ambiente e Energia, Departamento de Engenharia Química, Faculdade de Engenharia – Universidade do Porto, Porto, Portugal
| | - FJ Monteiro
- INEB – Instituto de Engenharia Biomédica, Universidade do Porto, Porto, Portugal
- Departamento de Engenharia Metalúrgica e Materiais, FEUP – Faculdade de Engenharia – Universidade do Porto, Porto, Portugal
| | - MP Ferraz
- INEB – Instituto de Engenharia Biomédica, Universidade do Porto, Porto, Portugal
- CEBIMED – Centro de Estudos em Biomedicina, Universidade Fernando Pessoa, Porto, Portugal
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Rzhepishevska O, Hakobyan S, Ruhal R, Gautrot J, Barbero D, Ramstedt M. The surface charge of anti-bacterial coatings alters motility and biofilm architecture. Biomater Sci 2013; 1:589-602. [DOI: 10.1039/c3bm00197k] [Citation(s) in RCA: 111] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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Abstract
This paper reports the cell-substratum interactions of planktonic (Chlorella vulgaris) and benthic (Botryococcus sudeticus) freshwater green algae with hydrophilic (glass) and hydrophobic (indium tin oxide) substrata to determine the critical parameters controlling the adhesion of algal cells to surfaces. The surface properties of the algae and substrata were quantified by measuring contact angle, electrophoretic mobility, and streaming potential. Using these data, the cell-substratum interactions were modeled using thermodynamic, DLVO, and XDLVO approaches. Finally, the rate of attachment and the strength of adhesion of the algal cells were quantified using a parallel-plate flow chamber. The results indicated that (1) acid-base interactions played a critical role in the adhesion of algae, (2) the hydrophobic alga attached at a higher density and with a higher strength of adhesion on both substrata, and (3) the XDLVO model was the most accurate in predicting the density of cells and their strength of adhesion. These results can be used to select substrata to promote/inhibit the adhesion of algal cells to surfaces.
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Affiliation(s)
- Altan Ozkan
- Civil, Architechtural and Environmental Engineering Department, Cockrell School of Engineering, The University of Texas at Austin, Austin, TX, USA
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