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Nefzi C, Yahmadi B, Lahmar M, Ouzari H, El Guesmi N, García JM, Kamoun-Turki N, Ahmed SA. Exploration of spray pyrolysis technique in preparation of absorber material CFATS: Unprecedented hydrophilic surface and antibacterial properties. ARAB J CHEM 2022. [DOI: 10.1016/j.arabjc.2022.103894] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
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Iftikhar A, Khan MS, Rashid U, Mahmood Q, Zafar H, Bilal M, Riaz N. Influence of metallic species for efficient photocatalytic water disinfection: bactericidal mechanism of in vitro results using docking simulation. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2020; 27:39819-39831. [PMID: 32356068 DOI: 10.1007/s11356-020-08974-z] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/29/2019] [Accepted: 04/21/2020] [Indexed: 05/14/2023]
Abstract
TiO2-based heterogeneous photocatalysis systems have been reported with remarkable efficiency to decontaminate and mineralize a range of pollutants present in air and water medium. In the present study, a series of visible light active metal oxide TiO2 nanoparticle were synthesized and evaluated for their photodegradation efficiency against emerging textile pollutant (Reactive Yellow 145) and antibacterial applications. In the first phase, nanomaterial synthesis was carried out following various synthesis parameters like addition of metallic impurities (different types and concentration) and calcination temperature. In the second phase, synthesized nanomaterials were screened for their performance in terms of photocatalytic degradation of RY145 and the best one (Fe-1-T-3 with 100% RY145 removal within 80 min of irradiation) was further optimized against various reaction parameters. To get knowledge about the insights of nanomaterial performance for degradation of different environmental pollutants, the most important is to understand their physicochemical properties utilizing different characterization techniques. The physical morphology and elemental dispersion of metal-doped TiO2 nanomaterials were analyzed and results indicated that added metallic impurities were well dispersed onto the substrate surface. The efficient nanomaterials selected from initial screening were further assessed for photocatalytic disinfection efficiency against human pathogenic bacterial strains. Antimicrobial activities of the metal oxide nanomaterial were tested against gram-positive and gram-negative pathogenic bacterial strains. Possible mode of interaction of nanomaterial with bacterial DNA for bacterial cell inactivation was predicted using molecular docking simulation. The research project has the potential to contribute to multiple disciplines like material synthesis, water disinfection, and as green solutions for the textile industry replacing traditional technologies.
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Affiliation(s)
- Aaima Iftikhar
- Department of Environmental Sciences, COMSATS University Islamabad, Abbottabad Campus, Abbottabad, 22060, Pakistan
| | - Muhammad Saqib Khan
- Department of Environmental Sciences, COMSATS University Islamabad, Abbottabad Campus, Abbottabad, 22060, Pakistan
| | - Umer Rashid
- Department of Chemistry, COMSATS University Islamabad, Abbottabad Campus, Abbottabad, 22060, Pakistan
| | - Qaisar Mahmood
- Department of Environmental Sciences, COMSATS University Islamabad, Abbottabad Campus, Abbottabad, 22060, Pakistan
| | - Habiba Zafar
- Department of Environmental Sciences, COMSATS University Islamabad, Abbottabad Campus, Abbottabad, 22060, Pakistan
| | - Muhammad Bilal
- Department of Environmental Sciences, COMSATS University Islamabad, Abbottabad Campus, Abbottabad, 22060, Pakistan
| | - Nadia Riaz
- Department of Environmental Sciences, COMSATS University Islamabad, Abbottabad Campus, Abbottabad, 22060, Pakistan.
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Moreno-Ríos AL, Ballesteros LM, Castro-López CA. Influence of process variables on the kinetic parameters of a Langmuir-Hinshelwood expression for E.coli inactivation during the photocatalytic disinfection of water. SEP SCI TECHNOL 2019. [DOI: 10.1080/01496395.2019.1676784] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Affiliation(s)
- Andrea L. Moreno-Ríos
- Centro de Investigaciones en Catálisis (CICAT), Universidad Industrial de Santander, Bucaramanga, Colombia
- Department of Civil and Environmental, Universidad de la Costa, Barranquilla, Colombia
| | - Luz M. Ballesteros
- Centro de Investigaciones en Catálisis (CICAT), Universidad Industrial de Santander, Bucaramanga, Colombia
| | - Camilo A. Castro-López
- Centro de Investigaciones en Catálisis (CICAT), Universidad Industrial de Santander, Bucaramanga, Colombia
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Arenas-Vivo A, Amariei G, Aguado S, Rosal R, Horcajada P. An Ag-loaded photoactive nano-metal organic framework as a promising biofilm treatment. Acta Biomater 2019; 97:490-500. [PMID: 31398473 DOI: 10.1016/j.actbio.2019.08.011] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2019] [Revised: 07/11/2019] [Accepted: 08/02/2019] [Indexed: 12/26/2022]
Abstract
Surface biofilm inhibition is still currently a considerable challenge. Among other organisms, Staphylococcus aureus is notable for its ability to form a strong biofilm with proved resistance to chemotherapy. Contamination of high-touch surfaces with S. aureus biofilm not only promotes disease spread but also generates tremendous health-associated costs. Therefore, development of new bactericidal and antiadhesive surface coatings is a priority. Considering that metal-organic frameworks (MOFs) have recently emerged as promising antibacterial agents, we originally report here the synthesis of a multi-active silver-containing nanoscaled MOF composite as a potential surface coating against S. aureus biofilm owing to a triple effect: intrinsic bactericide activity of the MOF, biocidal character of silver nanoparticles (AgNPs), and photoactivity after UVA irradiation. AgNPs were successfully entrapped within the benchmarked nanoscaled porous photoactive titanium(IV) aminoterephthalate MIL-125(Ti)NH2 using a simple and efficient impregnation-reduction method. After complete characterization of the composite thin film, its antibacterial and anti-adherent properties were fully evaluated. After UVA irradiation, the composite coating exhibited relevant bacterial inhibition and detachment, improved ligand-to-cluster charge transfer, and steady controlled delivery of Ag+. These promising results establish the potential of this composite as an active coating for biofilm treatment on high-touch surfaces (e.g., surgical devices, door knobs, and rail bars). STATEMENT OF SIGNIFICANCE: Surface contamination due to bacterial biofilm formation is still a demanding issue, as it causes severe disease spread. One possible solution is the development of antifouling and antibacterial surface coatings. In this work, we originally propose the use of photoactive metal-organic frameworks (MOFs) for biofilm treatment. The novelty of this work relies on the following: i) the treatment of strongly contaminated surfaces, as previous studies with MOFs have exclusively addressed biofilm prevention; ii) this pioneering work reports both antiadherent effect, which removes the biofilm, and bacterial inhibition; iii) our original successful strategy has never been proposed thus far, involving the multi-active combination of 1) intrinsic antibacterial effect of a photoactive titanium-based nanoMOF, 2) immobilization of biocide silver nanoparticles, and 3) improved anti-bioadherent effect upon irradiation of the composite coating.
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Affiliation(s)
- Ana Arenas-Vivo
- Advanced Porous Materials Unit (APMU), IMDEA Energy Institute, Avda. Ramón de la Sagra 3, E-28935 Móstoles, Madrid, Spain; Department of Inorganic Chemistry I, Chemical Sciences Faculty, Complutense University of Madrid, 28040 Madrid, Spain
| | - Georgiana Amariei
- Department of Chemical Engineering, University of Alcalá, E-28871 Alcalá de Henares, Madrid, Spain
| | - Sonia Aguado
- Department of Chemical Engineering, University of Alcalá, E-28871 Alcalá de Henares, Madrid, Spain
| | - Roberto Rosal
- Department of Chemical Engineering, University of Alcalá, E-28871 Alcalá de Henares, Madrid, Spain
| | - Patricia Horcajada
- Advanced Porous Materials Unit (APMU), IMDEA Energy Institute, Avda. Ramón de la Sagra 3, E-28935 Móstoles, Madrid, Spain.
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Natarajan S, Lakshmi DS, Thiagarajan V, Mrudula P, Chandrasekaran N, Mukherjee A. Antifouling and anti-algal effects of chitosan nanocomposite (TiO2/Ag) and pristine (TiO2 and Ag) films on marine microalgae Dunaliella salina. JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING 2018; 6:6870-6880. [DOI: 10.1016/j.jece.2018.10.050] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/26/2023]
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Uyguner Demirel CS, Birben NC, Bekbolet M. A comprehensive review on the use of second generation TiO 2 photocatalysts: Microorganism inactivation. CHEMOSPHERE 2018; 211:420-448. [PMID: 30077938 DOI: 10.1016/j.chemosphere.2018.07.121] [Citation(s) in RCA: 55] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/12/2018] [Revised: 07/04/2018] [Accepted: 07/21/2018] [Indexed: 05/12/2023]
Abstract
Photocatalytic disinfection practices have been applied for decades and attract current interest along with the developments in synthesis of novel photocatalysts. A survey based investigation was performed for elucidation of photocatalytic treatment details as well as disinfection mechanism of microorganisms. The present work brings significant information on the utilization of second generation TiO2 photocatalysts for inactivation of microorganisms typically using E. coli as the model microorganism. Special interest was devoted to the role of organic matrix either generated during treatment or as a natural component. Studies on photocatalytic disinfection were extensively reviewed and evaluated with respect to basic operational parameters related to photocatalysis, and types and properties of microorganisms investigated. Degradation mechanism and behavior of microorganisms towards reactive oxygen species during disinfection and organic matrix effects were also addressed. For successful utilization and effective assessment of visible light active photocatalysts, standard protocols for disinfection activity testing have to be set. Further improvement of the efficiency of these materials would be promising for future applications in water treatment processes.
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Affiliation(s)
| | - Nazmiye Cemre Birben
- Bogazici University, Institute of Environmental Sciences, 34342, Bebek, Istanbul, Turkey.
| | - Miray Bekbolet
- Bogazici University, Institute of Environmental Sciences, 34342, Bebek, Istanbul, Turkey.
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Núñez-Núñez CM, Chairez-Hernández I, García-Roig M, García-Prieto JC, Melgoza-Alemán RM, Proal-Nájera JB. UV-C/H2O2 heterogeneous photocatalytic inactivation of coliforms in municipal wastewater in a TiO2/SiO2 fixed bed reactor: a kinetic and statistical approach. REACTION KINETICS MECHANISMS AND CATALYSIS 2018. [DOI: 10.1007/s11144-018-1473-2] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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Esteban Florez FL, Hiers RD, Larson P, Johnson M, O'Rear E, Rondinone AJ, Khajotia SS. Antibacterial dental adhesive resins containing nitrogen-doped titanium dioxide nanoparticles. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2018; 93:931-943. [PMID: 30274130 DOI: 10.1016/j.msec.2018.08.060] [Citation(s) in RCA: 40] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/22/2017] [Revised: 04/25/2018] [Accepted: 08/29/2018] [Indexed: 10/28/2022]
Abstract
The development of dental adhesive resins with long-lasting antibacterial properties is a possible solution to overcome the problem of secondary caries in modern adhesive dentistry. OBJECTIVES (i) Synthesis and characterization of nitrogen-doped titanium dioxide nanoparticles (N_TiO2), (ii) topographical, compositional and wettability characterization of thin-films (unaltered and experimental) and, (iii) antibacterial efficacy of N_TiO2-containing dental adhesives against Streptococcus mutans biofilms. MATERIALS AND METHODS Nanoparticles were synthesized and characterized using different techniques. Specimens (diameter = 12 mm, thickness ≅ 15 μm) of OptiBond Solo Plus (Kerr Corp., USA) and experimental adhesives [50, 67 and 80% (v/v)] were fabricated, photopolymerized (1000 mW/cm2, 1 min) and UV-sterilized (254 nm, 800,000 μJ/cm2) for microscopy, spectroscopy, wettability and antibacterial testing. Wettability was assessed with a contact angle goniometer by dispensing water droplets (2 μL) onto four random locations of each specimen (16 drops/group). Drop profiles were recorded (1 min, 25 frames/s, 37 °C) and contact angles were calculated at time = 0 s (θINITIAL) and time = 59 s (θFINAL). Antibacterial testing was performed by growing S. mutans (UA159-ldh, JM10) biofilms for either 3 or 24 h (anaerobic conditions, 37 °C) with or without continuous light irradiation (410 ± 10 nm, 3 h = 38.75 J/cm2, 24 h = 310.07 J/cm2) against the surfaces of sterile specimens. RESULTS N_TiO2 was successfully prepared using solvothermal methods. Doped-nanoparticles displayed higher light absorption levels when compared to undoped titania. Experimental adhesives demonstrated superior antibacterial efficacy in dark conditions. CONCLUSIONS The findings presented herein suggest that N_TiO2 is a feasible antibacterial agent against cariogenic biofilms.
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Affiliation(s)
- Fernando Luis Esteban Florez
- The University of Oklahoma Health Sciences Center, Department of Restorative Sciences, Division of Dental Biomaterials College of Dentistry, 1201 North Stonewall Avenue, Room 146, Oklahoma City, OK 73117, USA.
| | - Rochelle Denise Hiers
- The University of Oklahoma Health Sciences Center, Department of Restorative Sciences, Division of Dental Biomaterials College of Dentistry, 1201 North Stonewall Avenue, Room 146, Oklahoma City, OK 73117, USA.
| | - Preston Larson
- The University of Oklahoma, Samuel Roberts Noble Microscopy Laboratory, 770 Van Vleet Oval, Norman, OK 73019, USA.
| | - Matthew Johnson
- The University of Oklahoma, Department of Physics and Astronomy, 440 West Brooks Street, Room 129, Norman, OK 73019, USA
| | - Edgar O'Rear
- The University of Oklahoma, School of Chemical, Biological and Materials Engineering, 100 East Boyd, T-301, Sarkeys Energy Center, Norman, OK 73019, USA.
| | - Adam J Rondinone
- Oak Ridge National Laboratory, Center for Nanophase Materials Sciences, Oak Ridge, TN 37831, USA.
| | - Sharukh Soli Khajotia
- The University of Oklahoma Health Sciences Center, Department of Restorative Sciences, Division of Dental Biomaterials College of Dentistry, 1201 North Stonewall Avenue, Room 146, Oklahoma City, OK 73117, USA.
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Zhu Z, Cai H, Sun DW. Titanium dioxide (TiO 2 ) photocatalysis technology for nonthermal inactivation of microorganisms in foods. Trends Food Sci Technol 2018. [DOI: 10.1016/j.tifs.2018.02.018] [Citation(s) in RCA: 62] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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10
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Menon NG, Tatiparti SSV, Mukherji S. Effect of calcination temperature on the microstructure and electronic properties of TiO2–ZnO nanocomposites and implications on photocatalytic activity. APPLIED NANOSCIENCE 2018. [DOI: 10.1007/s13204-018-0783-z] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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11
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Jalvo B, Faraldos M, Bahamonde A, Rosal R. Antimicrobial and antibiofilm efficacy of self-cleaning surfaces functionalized by TiO 2 photocatalytic nanoparticles against Staphylococcus aureus and Pseudomonas putida. JOURNAL OF HAZARDOUS MATERIALS 2017; 340:160-170. [PMID: 28715739 DOI: 10.1016/j.jhazmat.2017.07.005] [Citation(s) in RCA: 46] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/13/2017] [Revised: 06/25/2017] [Accepted: 07/03/2017] [Indexed: 05/27/2023]
Abstract
A photocatalytic sol of TiO2 nanoparticles has been used for creating self-cleaning antimicrobial flat and porous glass surfaces. The substrates were irradiated to study their photocatalytic properties and behavior in the presence of biofilm-forming bacteria. Smooth glass surfaces and glass microfiber filters were covered with 1.98×10-3±1.5×10-4gcm-2 and 8.55×10-3±3.0×10-4gcm-2 densities, respectively. Self-cleaning properties were analyzed using the methylene blue 365nm UV-A photodegradation test. TiO2-coated filters achieved rapid and complete photodegradation of methylene blue because of the better TiO2 dispersion with respect to the glass slides. The effect of functionalized surfaces on the growth and viability of bacteria was studied using the strains Staphylococcus aureus and Pseudomonas putida. After irradiation (2h, 11.2Wm-2, 290-400nm), the initially hydrophobic surface turned hydrophilic. The antibacterial effect led to extensive membrane damage and significant production of intracellular reactive oxygen species in all TiO2-loaded irradiated specimens. The reduction of cell viability was over 99.9% (>3-log) for TiO2 on glass surfaces. However, the polymeric extracellular matrix formed before the irradiation treatment was not removed. This study highlights the importance of bacterial colonization during dark periods and the difficulty of removing the structure of biofilms.
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Affiliation(s)
- Blanca Jalvo
- Department of Chemical Engineering, University of Alcalá, E-28871 Alcalá de Henares, Madrid, Spain
| | - Marisol Faraldos
- Instituto de Catálisis y Petroleoquímica, ICP-CSIC, Marie Curie 2, 28049 Madrid, Spain.
| | - Ana Bahamonde
- Instituto de Catálisis y Petroleoquímica, ICP-CSIC, Marie Curie 2, 28049 Madrid, Spain
| | - Roberto Rosal
- Department of Chemical Engineering, University of Alcalá, E-28871 Alcalá de Henares, Madrid, Spain.
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12
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Nosaka Y, Nosaka AY. Generation and Detection of Reactive Oxygen Species in Photocatalysis. Chem Rev 2017; 117:11302-11336. [DOI: 10.1021/acs.chemrev.7b00161] [Citation(s) in RCA: 1754] [Impact Index Per Article: 250.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Affiliation(s)
- Yoshio Nosaka
- Department of Materials Science
and Technology, Nagaoka University of Technology Nagaoka 940-2188, Japan
| | - Atsuko Y. Nosaka
- Department of Materials Science
and Technology, Nagaoka University of Technology Nagaoka 940-2188, Japan
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Mac Mahon J, Pillai SC, Kelly JM, Gill LW. Solar photocatalytic disinfection of E. coli and bacteriophages MS2, ΦX174 and PR772 using TiO 2 , ZnO and ruthenium based complexes in a continuous flow system. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 2017; 170:79-90. [DOI: 10.1016/j.jphotobiol.2017.03.027] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/29/2016] [Revised: 03/30/2017] [Accepted: 03/30/2017] [Indexed: 10/19/2022]
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Disinfection of Multidrug Resistant Escherichia coli by Solar-Photocatalysis using Fe-doped ZnO Nanoparticles. Sci Rep 2017; 7:104. [PMID: 28273898 PMCID: PMC5427922 DOI: 10.1038/s41598-017-00173-0] [Citation(s) in RCA: 56] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2016] [Accepted: 02/13/2017] [Indexed: 01/21/2023] Open
Abstract
Spread of antibiotic resistant bacteria through water, is a threat to global public health. Here, we report Fe-doped ZnO nanoparticles (Fe/ZnO NPs) based solar-photocatalytic disinfection (PCD) of multidrug resistant Escherichia coli (MDR E. coli). Fe/ZnO NPs were synthesized by chemical precipitation technique, and when used as photocatalyst for disinfection, proved to be more effective (time for complete disinfection = 90 min) than ZnO (150 min) and TiO2 (180 min). Lipid peroxidation and potassium (K+) ion leakage studies indicated compromisation of bacterial cell membrane and electron microscopy and live-dead staining confirmed the detrimental effects on membrane integrity. Investigations indicated that H2O2 was the key species involved in solar-PCD of MDR E. coli by Fe/ZnO NPs. X-ray diffraction and atomic absorption spectroscopy studies showed that the Fe/ZnO NPs system remained stable during the photocatalytic process. The Fe/ZnO NPs based solar-PCD process proved successful in the disinfection of MDR E. coli in real water samples collected from river, pond and municipal tap. The Fe/ZnO NPs catalyst made from low cost materials and with high efficacy under solar light may have potential for real world applications, to help reduce the spread of resistant bacteria.
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Buccheri MA, D'Angelo D, Scalese S, Spanò SF, Filice S, Fazio E, Compagnini G, Zimbone M, Brundo MV, Pecoraro R, Alba A, Sinatra F, Rappazzo G, Privitera V. Modification of graphene oxide by laser irradiation: a new route to enhance antibacterial activity. NANOTECHNOLOGY 2016; 27:245704. [PMID: 27158973 DOI: 10.1088/0957-4484/27/24/245704] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
The antibacterial activity and possible toxicity of graphene oxide and laser-irradiated graphene oxide (iGO) were investigated. Antibacterial activity was tested on Escherichia coli and shown to be higher for GO irradiated for at least three hours, which seems to be correlated to the resulting morphology of laser-treated GO and independent of the kind and amount of oxygen functionalities. X-ray photoelectron spectroscopy, Raman spectroscopy, dynamic light scattering and scanning electron microscopy (SEM) show a reduction of the GO flakes size after visible laser irradiation, preserving considerable oxygen content and degree of hydrophilicity. SEM images of the bacteria after the exposure to the iGO flakes confirm membrane damage after interaction with the laser-modified morphology of GO. In addition, a fish embryo toxicity test on zebrafish displayed that neither mortality nor sublethal effects were caused by the different iGO solutions, even when the concentration was increased up to four times higher than the one effective in reducing the bacteria survival. The antibacterial properties and the absence of toxicity make the visible laser irradiation of GO a promising option for water purification applications.
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Characterization of antimicrobial efficacy of photocatalytic polymers against food-borne biofilms. Lebensm Wiss Technol 2016. [DOI: 10.1016/j.lwt.2015.11.063] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Pezzoni M, Tribelli PM, Pizarro RA, López NI, Costa CS. Exposure to low UVA doses increases KatA and KatB catalase activities, and confers cross-protection against subsequent oxidative injuries in Pseudomonas aeruginosa. Microbiology (Reading) 2016; 162:855-864. [DOI: 10.1099/mic.0.000268] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Affiliation(s)
- Magdalena Pezzoni
- Departamento de Radiobiología, Comisión Nacional de Energía Atómica, General San Martín, Argentina
| | - Paula M. Tribelli
- IQUIBICEN-CONICET-Departamento de Química Biológica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, CABA, Argentina
| | - Ramón A. Pizarro
- Departamento de Radiobiología, Comisión Nacional de Energía Atómica, General San Martín, Argentina
| | - Nancy I. López
- IQUIBICEN-CONICET-Departamento de Química Biológica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, CABA, Argentina
| | - Cristina S. Costa
- Departamento de Radiobiología, Comisión Nacional de Energía Atómica, General San Martín, Argentina
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Dworniczek E, Plesch G, Seniuk A, Adamski R, Michal R, Čaplovičová M. Photo-catalytic inactivation of an Enterococcus biofilm: the anti-microbial effect of sulphated and europium-doped titanium dioxide nanopowders. FEMS Microbiol Lett 2016; 363:fnw051. [PMID: 26940291 DOI: 10.1093/femsle/fnw051] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/01/2016] [Indexed: 11/14/2022] Open
Abstract
The control and prevention of biofilm-related infections is an important public healthcare issue. Given the increasing antibiotic resistance among bacteria and fungi that cause serious infections in humans, promotion of new strategies combating microorganisms has been essential. One attractive approach to inactivate microorganisms is the use of semiconductor photo-catalysis, which has become the subject of extensive research. In this study, the bactericidal properties of four photo-catalysts, TiO₂, TiO₂-S, TiO₂-Eu and TiO₂-Eu-S, were investigated against established 24, 48, 72 and 96 h biofilms of Enterococcus The exposure of biofilms to the catalysts induced the production of superoxide radical anions. The best photo-catalytic inactivation was achieved with the TiO₂-Eu-S and TiO₂-S nanopowders and 24 h biofilms. Transmission electron microscopy images showed significant changes in the structure of the biofilm cells following photo-inactivation. The results suggest that doping with europium and modifying the surface with sulphate groups enhanced the bactericidal activity of the TiO₂ nanoparticles against enterococcal biofilms.
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Affiliation(s)
- Ewa Dworniczek
- Department of Microbiology, Wrocław Medical University, 50-368 Wrocław, Poland
| | - Gustav Plesch
- Department of Inorganic Chemistry, Faculty of Natural Sciences, Comenius University, 842 15 Bratislava, Slovakia
| | - Alicja Seniuk
- Department of Microbiology, Wrocław Medical University, 50-368 Wrocław, Poland
| | - Ryszard Adamski
- Institute of Genetics and Microbiology, University of Wrocław, 51-148 Wrocław, Poland
| | - Róbert Michal
- Department of Inorganic Chemistry, Faculty of Natural Sciences, Comenius University, 842 15 Bratislava, Slovakia
| | - Mária Čaplovičová
- Department of Inorganic Chemistry, Faculty of Natural Sciences, Comenius University, 842 15 Bratislava, Slovakia
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Supha C, Boonto Y, Jindakaraked M, Ananpattarachai J, Kajitvichyanukul P. Long-term exposure of bacterial and protozoan communities to TiO 2 nanoparticles in an aerobic-sequencing batch reactor. SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS 2015; 16:034609. [PMID: 27877796 PMCID: PMC5099833 DOI: 10.1088/1468-6996/16/3/034609] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/26/2015] [Revised: 05/22/2015] [Accepted: 05/23/2015] [Indexed: 06/01/2023]
Abstract
Titanium dioxide (TiO2) nanopowders at different concentrations (0-50 mg L-1) were injected into an aerobic-sequencing batch reactor (SBR) to investigate the effects of long-term exposure to nanoparticles on bacterial and protozoan communities. The detection of nanoparticles in the bioflocs was analyzed by scanning electron microscopy, transmission electron microscopy, and energy-dispersive x-ray spectroscopy. The SBR wastewater experiments were conducted under the influence of ultraviolet light with photocatalytic TiO2. The intrusion of TiO2 nanoparticles was found both on the surface and inside of the bioflocs. The change of microbial population in terms of mixed liquor-suspended solids and the sludge volume index was monitored. The TiO2 nanoparticles tentatively exerted an adverse effect on the microbial population, causing the reduction of microorganisms (both bacteria and protozoa) in the SBR. The respiration inhibition rate of the bacteria was increased, and the viability of the microbial population was reduced at the high concentration (50 mg L-1) of TiO2. The decreasing number of protozoa in the presence of TiO2 nanoparticles during 20 days of treatment with 0.5 and 1.0 mg L-1 TiO2 is clearly demonstrated. The measured chemical oxygen demand (COD) in the effluent tends to increase with a long-term operation. The increase of COD in the system suggests a decrease in the efficiency of the wastewater treatment plant. However, the SBR can effectively remove the TiO2 nanoparticles (up to 50 mg L-1) from the effluent.
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Affiliation(s)
| | | | | | | | - Puangrat Kajitvichyanukul
- Center of Excellence on Environmental Research and Innovation, Faculty of Engineering, Naresuan University, Phitsanulok, 65000, Thailand
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Cai Y, Strømme M, Zhang P, Engqvist H, Welch K. Photocatalysis induces bioactivity of an organic polymer based material. RSC Adv 2014. [DOI: 10.1039/c4ra08805k] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Bioactivity of resin–TiO2 nanocomposite induced by TiO2 photocatalysis under UV irradiation.
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Affiliation(s)
- Yanling Cai
- Nanotechnology and Functional Materials
- The Ångström Laboratory
- Uppsala University
- Uppsala, Sweden
| | - Maria Strømme
- Nanotechnology and Functional Materials
- The Ångström Laboratory
- Uppsala University
- Uppsala, Sweden
| | - Peng Zhang
- Nanotechnology and Functional Materials
- The Ångström Laboratory
- Uppsala University
- Uppsala, Sweden
| | - Håkan Engqvist
- Applied Materials Science
- The Ångström Laboratory
- Uppsala University
- Uppsala, Sweden
| | - Ken Welch
- Nanotechnology and Functional Materials
- The Ångström Laboratory
- Uppsala University
- Uppsala, Sweden
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21
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Quiñones-Jurado ZV, Waldo-Mendoza MÁ, Aguilera-Bandin HM, Villabona-Leal EG, Cervantes-González E, Pérez E. Silver Nanoparticles Supported on TiO<sub>2</sub> and Their Antibacterial Properties: Effect of Surface Confinement and Nonexistence of Plasmon Resonance. ACTA ACUST UNITED AC 2014. [DOI: 10.4236/msa.2014.512091] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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