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Domi B, Bhorkar K, Rumbo C, Sygellou L, Yannopoulos SN, Quesada R, Tamayo-Ramos JA. Fate assessment of commercial 2D MoS 2 aqueous dispersions at physicochemical and toxicological level. NANOTECHNOLOGY 2020; 31:445101. [PMID: 32674094 DOI: 10.1088/1361-6528/aba6b3] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
The physicochemical properties and the toxicological potential of commercially available MoS2 nanoparticles with different lateral size and degradation stage were studied in the present research work. To achieve this, the structure and stoichiometry of fresh and old aqueous suspensions of micro-MoS2 and nano-MoS2 was analyzed by Raman, while x-ray photoelectron spectroscopy allowed to identify more quantitatively the nature of the formed oxidized species. A, the toxicological impact of the nanomaterials under analysis was studied using adenocarcinomic human alveolar basal epithelial cells (A549 cells) and the unicellular fungus S. cerevisiae as biological models. Cell viability assays and reactive oxygen species (ROS) determinations demonstrated different toxicity levels depending on the cellular model used and in function of the degradation state of the selected commercial nanoproducts. Both MoS2 nanoparticle types induced sublethal damage on the A549 cells though the increase of intracellular ROS levels, while comparable concentrations reduced the viability of yeast cells. In addition, the old MoS2 nanoparticles suspensions exhibited a higher toxicity for both human and yeast cells than the fresh ones. Our findings demonstrate that the fate assessment of nanomaterials is a critical aspect to increase the understanding on their characteristics and on their potential impact on biological systems along their life cycle.
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Affiliation(s)
- Brixhilda Domi
- International Research Centre in Critical Raw Materials-ICCRAM, Universidad de Burgos, Plaza Misael Banuelos s/n, 09001 Burgos, Spain
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Sen SK, Dutta S, Khan MR, Manir MS, Dutta S, Al Mortuza A, Razia S, Hakim MA. Characterization and Antibacterial Activity Study of Hydrothermally Synthesized h-MoO3 Nanorods and α-MoO3 Nanoplates. BIONANOSCIENCE 2019. [DOI: 10.1007/s12668-019-00671-7] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
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Gajarska Z, Zelenka KC, Rathner P, Recktenwald D, Kollender JP, Shahzad K, Müller N, Hassel AW, Mardare CC. Insight into Antimicrobial Properties via Self-Acidification of Compounds from the Molybdenum–Tungsten–Oxygen System. ACS APPLIED BIO MATERIALS 2019; 2:1477-1489. [DOI: 10.1021/acsabm.8b00722] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Zuzana Gajarska
- CEST Competence Center for Electrochemical Surface Technology, Viktor Kaplan Strasse 2, Wiener Neustadt 2700, Austria
- CEST Competence Center for Electrochemical Surface Technology, Altenberger Strasse 69, Linz 4040, Austria
| | - Karl Christian Zelenka
- CEST Competence Center for Electrochemical Surface Technology, Viktor Kaplan Strasse 2, Wiener Neustadt 2700, Austria
- CEST Competence Center for Electrochemical Surface Technology, Altenberger Strasse 69, Linz 4040, Austria
| | | | | | | | - Khurram Shahzad
- CEST Competence Center for Electrochemical Surface Technology, Viktor Kaplan Strasse 2, Wiener Neustadt 2700, Austria
- CEST Competence Center for Electrochemical Surface Technology, Altenberger Strasse 69, Linz 4040, Austria
| | | | - Achim Walter Hassel
- CEST Competence Center for Electrochemical Surface Technology, Viktor Kaplan Strasse 2, Wiener Neustadt 2700, Austria
- CEST Competence Center for Electrochemical Surface Technology, Altenberger Strasse 69, Linz 4040, Austria
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Herget K, Frerichs H, Pfitzner F, Tahir MN, Tremel W. Functional Enzyme Mimics for Oxidative Halogenation Reactions that Combat Biofilm Formation. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2018; 30:e1707073. [PMID: 29920781 DOI: 10.1002/adma.201707073] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/04/2017] [Revised: 01/18/2018] [Indexed: 06/08/2023]
Abstract
Transition-metal oxide nanoparticles and molecular coordination compounds are highlighted as functional mimics of halogenating enzymes. These enzymes are involved in halometabolite biosynthesis. Their activity is based upon the formation of hypohalous acids from halides and hydrogen peroxide or oxygen, which form bioactive secondary metabolites of microbial origin with strong antibacterial and antifungal activities in follow-up reactions. Therefore, enzyme mimics and halogenating enzymes may be valuable tools to combat biofilm formation. Here, halogenating enzyme models are briefly described, enzyme mimics are classified according to their catalytic functions, and current knowledge about the settlement chemistry and adhesion of fouling organisms is summarized. Enzyme mimics with the highest potential are showcased. They may find application in antifouling coatings, indoor and outdoor paints, polymer membranes for water desalination, or in aquacultures, but also on surfaces for food packaging, door handles, hand rails, push buttons, keyboards, and other elements made of plastic where biofilms are present. The use of natural compounds, formed in situ with nontoxic and abundant metal oxide enzyme mimics, represents a novel and efficient "green" strategy to emulate and utilize a natural defense system for preventing bacterial colonization and biofilm growth.
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Affiliation(s)
- Karoline Herget
- Institut für Anorganische Chemie und Analytische Chemie, Johannes Gutenberg-Universität, Duesbergweg 10-14, D-55128, Mainz, Germany
| | - Hajo Frerichs
- Institut für Anorganische Chemie und Analytische Chemie, Johannes Gutenberg-Universität, Duesbergweg 10-14, D-55128, Mainz, Germany
| | - Felix Pfitzner
- Institut für Anorganische Chemie und Analytische Chemie, Johannes Gutenberg-Universität, Duesbergweg 10-14, D-55128, Mainz, Germany
| | - Muhammad Nawaz Tahir
- Institut für Anorganische Chemie und Analytische Chemie, Johannes Gutenberg-Universität, Duesbergweg 10-14, D-55128, Mainz, Germany
| | - Wolfgang Tremel
- Institut für Anorganische Chemie und Analytische Chemie, Johannes Gutenberg-Universität, Duesbergweg 10-14, D-55128, Mainz, Germany
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Piva RH, Rocha MC, Piva DH, Montedo ORK, Imasato H, Malavazi I, Rodrigues-Filho UP. Combating pathogens with Cs 2.5H 0.5PW 12O 40 nanoparticles: a new proton-regulated antimicrobial agent. J Mater Chem B 2018; 6:143-152. [PMID: 32254202 DOI: 10.1039/c7tb02763j] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
The transfer of pathogens from contaminated surfaces to patients is one of the main causes of health care-associated infections (HCAIs). Cases of HCAIs due to multidrug-resistant organisms have been growing worldwide, whereas inorganic nano-antimicrobials are valuable today for the prevention and control of HCAIs. Here, we present a cesium salt of phosphotungstic heteropolyacid (Cs2.5H0.5PW12O40) as a promising nanomaterial for use in antimicrobial product technologies. This water-insoluble Keggin salt exhibits a broad biocide spectrum against Gram-positive and Gram-negative bacteria, yeasts, and filamentous fungi even under dark conditions. The Cs2.5H0.5PW12O40 nanoparticles (NPs) act as a proton-regulated antimicrobial whose activity is mediated on the release of hydronium ions (H3O+), yielding an in situ acidic pH several units below those tolerable by most of the fungal and bacterial nosocomial pathogens.
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Affiliation(s)
- Roger Honorato Piva
- Grupo de Química de Materiais Híbridos e Inorgânicos, Instituto de Química de São Carlos, Universidade de São Paulo, São Carlos - SP, Brazil.
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Jia XJ, Wang J, Wu J, Teng W, Zhao B, Li H, Du Y. Facile synthesis of MoO2/CaSO4 composites as highly efficient adsorbents for congo red and rhodamine B. RSC Adv 2018; 8:1621-1631. [PMID: 35540873 PMCID: PMC9077254 DOI: 10.1039/c7ra11292k] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2017] [Accepted: 12/20/2017] [Indexed: 12/03/2022] Open
Abstract
A novel rod-shaped MoO2/CaSO4 composite was prepared by using hexa-ammonium molybdate and flue gas desulfurization gypsum via a simple mixed-solvothermal route. In this composite, CaSO4 matrices are decorated with MoO2 nanoparticles, and non-structural mesopores are formed via particle packing. Moreover, it displays an excellent adsorption capability towards anionic congo red (CR) and cationic rhodamine B (RhB). The adsorption quantities per unit mass and removal efficiencies of the two dyes are significantly influenced by adsorbent dose, solution pH, and temperature. The adsorption isotherm data can be best fitted by the Langmuir model, and the calculated maximum adsorption quantities at 303.5 K are 853.54 mg g−1 for CR and 86.38 mg g−1 for RhB, respectively, which are superior to other common adsorbents. The corresponding kinetic data can be well matched with the pseudo-second-order model. Additionally, the CR adsorption is an exothermic process, while the RhB adsorption is an endothermic process. Both of them are multi-step chemisorption processes influenced by surface adsorption and intra-particle diffusion. This MoO2/CaSO4 composite can be applied as an alternative adsorbent for removing organic dyestuffs from printing and dyeing wastewater. A new kind of rod-shaped MoO2/CaSO4 composite, in which MoO2 nanoparticles are supported on the surface of CaSO4 matrices, was prepared via a mixed-solvothermal method for efficient removal towards congo red and rhodamine B.![]()
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Affiliation(s)
- Xin-Jian Jia
- Key Laboratory of Advanced Functional Materials for Ministry of Education
- College of Materials Science and Engineering
- Beijing University of Technology
- Beijing 100124
- China
| | - Jinshu Wang
- Key Laboratory of Advanced Functional Materials for Ministry of Education
- College of Materials Science and Engineering
- Beijing University of Technology
- Beijing 100124
- China
| | - Junshu Wu
- Key Laboratory of Advanced Functional Materials for Ministry of Education
- College of Materials Science and Engineering
- Beijing University of Technology
- Beijing 100124
- China
| | - Weili Teng
- Key Laboratory of Advanced Functional Materials for Ministry of Education
- College of Materials Science and Engineering
- Beijing University of Technology
- Beijing 100124
- China
| | - Bingxin Zhao
- Key Laboratory of Advanced Functional Materials for Ministry of Education
- College of Materials Science and Engineering
- Beijing University of Technology
- Beijing 100124
- China
| | - Hongyi Li
- Key Laboratory of Advanced Functional Materials for Ministry of Education
- College of Materials Science and Engineering
- Beijing University of Technology
- Beijing 100124
- China
| | - Yucheng Du
- Key Laboratory of Advanced Functional Materials for Ministry of Education
- College of Materials Science and Engineering
- Beijing University of Technology
- Beijing 100124
- China
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Silver-, calcium-, and copper molybdate compounds: Preparation, antibacterial activity, and mechanisms. Biointerphases 2017; 12:05G607. [PMID: 29113436 DOI: 10.1116/1.4996434] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Developing novel compounds with antimicrobial properties can be an effective approach to decreasing the number of healthcare-associated infections, particularly in the context of medical devices and touch surfaces. A variety of molybdate powders (Ag2MoO4, CaMoO4, CuMoO4 and Cu3Mo2O9) were synthesized and characterized, and Escherichia coli was used as a model gram-negative bacterium to demonstrate their antimicrobial properties. Optical density measurements, bacterial colony growth, and stained gel images for protein expression clearly showed that silver- and copper molybdates inhibit bacterial growth, whereas CaMoO4 exhibited no bactericidal effect. All tests were performed in both daylight and darkness to assess the possible contribution of a photocatalytic effect on the activity observed. The main mechanism responsible for the antibacterial effect observed for Ag2MoO4 is related to Ag+ release in combination with medium acidification, whereas for compounds containing copper, leaching of Cu2+ ions is proposed. All these effects are known to cause damage at the cellular level. A photocatalytic contribution to the antibacterial activity was not clearly observable. Based on the pH and solubility measurements performed for powders in contact with various media (ultrapure water and bacterial growth medium), silver molybdate (Ag2MoO4) was identified as the best antibacterial candidate. This compound has great potential for further use in hybrid powder-polymer/varnish systems for touch surfaces in healthcare settings.
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de Castro IA, Datta RS, Ou JZ, Castellanos-Gomez A, Sriram S, Daeneke T, Kalantar-Zadeh K. Molybdenum Oxides - From Fundamentals to Functionality. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2017; 29:1701619. [PMID: 28815807 DOI: 10.1002/adma.201701619] [Citation(s) in RCA: 182] [Impact Index Per Article: 26.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/22/2017] [Revised: 04/27/2017] [Indexed: 05/20/2023]
Abstract
The properties and applications of molybdenum oxides are reviewed in depth. Molybdenum is found in various oxide stoichiometries, which have been employed for different high-value research and commercial applications. The great chemical and physical characteristics of molybdenum oxides make them versatile and highly tunable for incorporation in optical, electronic, catalytic, bio, and energy systems. Variations in the oxidation states allow manipulation of the crystal structure, morphology, oxygen vacancies, and dopants, to control and engineer electronic states. Despite this overwhelming functionality and potential, a definitive resource on molybdenum oxide is still unavailable. The aim here is to provide such a resource, while presenting an insightful outlook into future prospective applications for molybdenum oxides.
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Affiliation(s)
| | | | - Jian Zhen Ou
- School of Engineering, RMIT University, Melbourne, VIC, 3000, Australia
| | | | - Sharath Sriram
- School of Engineering, RMIT University, Melbourne, VIC, 3000, Australia
| | - Torben Daeneke
- School of Engineering, RMIT University, Melbourne, VIC, 3000, Australia
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Brühwasser C, Heinrich H, Lass-Flörl C, Mayr A. Self-disinfecting surfaces and activity against Staphyloccocus aureus ATCC 6538 under real-life conditions. J Hosp Infect 2017. [PMID: 28647424 DOI: 10.1016/j.jhin.2017.06.022] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Environmental surface contamination provides a potential reservoir for pathogens to cause infections. As such, self-disinfecting surfaces have been developed to possibly reduce exogenous transmission. Five different self-disinfecting surfaces were evaluated for activity against Staphylococcus aureus ATCC 6538 under real-life conditions using the dry inoculation method. Various antimicrobial effects were detected. However, following disinfection with alcoholic wipes, these effects disappeared. Further development is necessary to produce self-disinfecting surfaces that are stable in the presence of hospital disinfectants, as it is impossible to guarantee that self-disinfecting surfaces in healthcare settings will not be exposed to disinfectants.
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Affiliation(s)
- C Brühwasser
- Division of Hygiene and Medical Microbiology, Department of Hygiene, Microbiology and Public Health, Medical University of Innsbruck, Innsbruck, Austria; Christian Doppler Laboratory for Invasive Fungal Infections, Innsbruck, Austria
| | - H Heinrich
- EGGER Holzwerkstoffe Wismar GmbH & CoKG, Wismar, Germany
| | - C Lass-Flörl
- Division of Hygiene and Medical Microbiology, Department of Hygiene, Microbiology and Public Health, Medical University of Innsbruck, Innsbruck, Austria; Christian Doppler Laboratory for Invasive Fungal Infections, Innsbruck, Austria
| | - A Mayr
- Division of Hygiene and Medical Microbiology, Department of Hygiene, Microbiology and Public Health, Medical University of Innsbruck, Innsbruck, Austria; Christian Doppler Laboratory for Invasive Fungal Infections, Innsbruck, Austria.
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Shafaei S, Dörrstein J, Guggenbichler JP, Zollfrank C. Cellulose acetate-based composites with antimicrobial properties from embedded molybdenum trioxide particles. Lett Appl Microbiol 2016; 64:43-50. [PMID: 27646410 DOI: 10.1111/lam.12670] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2016] [Revised: 05/18/2016] [Accepted: 06/17/2016] [Indexed: 11/30/2022]
Abstract
The objective of this research was to develop novel cellulose acetate (biopolymer) composite materials with an excellent antimicrobial activity by embedding molybdenum trioxide particles with unique high specific surface area. High surface area molybdenum trioxide particles were prepared from freshly precipitated molybdenum trioxide dihydrate (MoO3 ·2H2 O) and subsequent calcination at 340°C under H2 /N2 gas. Microbiological evaluation against Staphylococcus aureus, Escherichia coli and Pseudomonas aeruginosa were performed applying a roll-on test and excellent antimicrobial activities were determined for composites with embedded anhydrous molybdenum trioxide with a high specific surface area. Cellulose acetate composites comprising MoO3 particles can eliminate three harmful bacteria as a result of the release of protons from the material and surface enlargement of the molybdenum trioxide particles. The findings support a proposed antimicrobial mechanism based on local acidity increase due to large specific surface areas. SIGNIFICANCE AND IMPACT OF THE STUDY In this study, development of a novel thermoplastic bio-based composite with excellent antimicrobial surface properties is investigated. To the best of our knowledge, this is the first report to evaluate the antimicrobial properties of molybdenum trioxide embedded into a cellulose acetate as biopolymer matrix. The developed composites might step up to innovative applications used in modern medical and public environments.
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Affiliation(s)
- S Shafaei
- Chair for Biogenic Polymers, Technische Universität München (TUM), Straubing, Germany
| | - J Dörrstein
- Chair for Biogenic Polymers, Technische Universität München (TUM), Straubing, Germany
| | | | - C Zollfrank
- Chair for Biogenic Polymers, Technische Universität München (TUM), Straubing, Germany
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Zhang H, Huang Q, Xu A, Wu L. Spectroscopic probe to contribution of physicochemical transformations in the toxicity of aged ZnO NPs to Chlorella vulgaris: new insight into the variation of toxicity of ZnO NPs under aging process. Nanotoxicology 2016; 10:1177-87. [PMID: 27248459 DOI: 10.1080/17435390.2016.1196252] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
Zinc oxide nanoparticles (ZnO NPs) are one of the most abundantly applied nanomaterials in nanotechnology-based industries and they may cause unexpected environmental and health risks with their physicochemical transformations in the environment. Currently, there is still a lack of the in-depth understanding of the toxicity of aged ZnO NPs to aquatic organisms, particularly demanding quantitative analysis of the physicochemical transformations to distinguish their contributions in the toxicity assessment. For this purpose, therefore, we initiated the study of the toxicity of aged ZnO NPs to the model aquatic microalga, i.e. Chlorella vulgaris, and with the aid of spectroscopic tools for characterization and quantification of the physicochemical transformations, we scrutinized the toxicity variations for ZnO NPs with different aging times. As a result, we found that the toxicity altered in an abnormal manner with the aging time, i.e. the toxicity of aged ZnO NPs for 30 days showed the higher toxicity to the green alga than the fresh ZnO NPs or the ZnO NPs aged for longer time (e.g. 120 and 210 days). Through spectroscopic tools such as XRD, FTIR and Raman spectroscopy, we made both the qualitative and quantitative assessments of the physicochemical changes of the ZnO NPs, and confirmed that in the early stage, the toxicity mainly stemmed from the release of zinc ions, but with longer aging time, the neoformation of the nanoparticles played the critical role, leading to the overall reduced toxicity due to the less toxic hydrozincite and zinc hydroxide in the transformed compounds.
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Affiliation(s)
- Hong Zhang
- a Institute of Technical Biology and Agriculture Engineering, Key Laboratory of Ion Beam Bioengineering, Key Laboratory of Environmental Toxicology and Pollution Control Technology of Anhui Province, Hefei Institutes of Physical Science, Chinese Academy of Sciences , Hefei , China , and
| | - Qing Huang
- a Institute of Technical Biology and Agriculture Engineering, Key Laboratory of Ion Beam Bioengineering, Key Laboratory of Environmental Toxicology and Pollution Control Technology of Anhui Province, Hefei Institutes of Physical Science, Chinese Academy of Sciences , Hefei , China , and.,b National Synchrotron Radiation Laboratory, and School of Nuclear Science and Technology, University of Science & Technology of China , Hefei , China
| | - An Xu
- a Institute of Technical Biology and Agriculture Engineering, Key Laboratory of Ion Beam Bioengineering, Key Laboratory of Environmental Toxicology and Pollution Control Technology of Anhui Province, Hefei Institutes of Physical Science, Chinese Academy of Sciences , Hefei , China , and
| | - Lijun Wu
- a Institute of Technical Biology and Agriculture Engineering, Key Laboratory of Ion Beam Bioengineering, Key Laboratory of Environmental Toxicology and Pollution Control Technology of Anhui Province, Hefei Institutes of Physical Science, Chinese Academy of Sciences , Hefei , China , and
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