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Yu Q, Wang G, Shao Z, Sun Y, Yang Z. Changes in life history parameters and expression of key genes of Brachionus plicatilis exposed to a combination of organic and inorganic ultraviolet filters. CHEMOSPHERE 2024; 358:142213. [PMID: 38697570 DOI: 10.1016/j.chemosphere.2024.142213] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/05/2024] [Revised: 04/17/2024] [Accepted: 04/30/2024] [Indexed: 05/05/2024]
Abstract
The increasing use of ultraviolet filters has become an emerging contaminant on the coast, posing potential ecological risks. Rotifers are essential components of marine ecosystems, serving as an association between primary producers and higher-level consumers. These organisms frequently encounter ultraviolet filters in coastal waters. This study aimed to assess the comprehensive effects of organic ultraviolet filters, specifically 2-ethylhexyl-4-methoxycinnamate (EHMC), and inorganic ultraviolet filters, namely, titanium dioxide nanoparticles (TiO2 NPs), on the rotifer Brachionus plicatilis. We exposed B. plicatilis to multiple combinations of different concentrations of EHMC and TiO2 NPs to observe changes in life history parameters and the expression of genes related to reproduction and antioxidant responses. Our findings indicated that increased EHMC concentrations significantly delayed the age at first reproduction, reduced the total offspring, and led to considerable alterations in the expression of genes associated with reproduction and stress. Exposure to TiO2 NPs resulted in earlier reproduction and decreased total offspring, although these changes were not synchronised in gene expression. The two ultraviolet filters had a significant interaction on the age at first reproduction and the total offspring of rotifer, with these interactions extending to the first generation. This research offers new insights into the comprehensive effects of different types of ultraviolet filters on rotifers by examining life history parameters and gene expression related to reproduction and stress, highlighting the importance of understanding the impacts of sunscreen products on zooplankton health.
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Affiliation(s)
- Qingqing Yu
- Jiangsu Key Laboratory for Biodiversity and Biotechnology, School of Biological Sciences, Nanjing Normal University, 1 Wenyuan Road, Nanjing, 210023, China
| | - Gongyuan Wang
- Jiangsu Key Laboratory for Biodiversity and Biotechnology, School of Biological Sciences, Nanjing Normal University, 1 Wenyuan Road, Nanjing, 210023, China
| | - Zhihao Shao
- Jiangsu Key Laboratory for Biodiversity and Biotechnology, School of Biological Sciences, Nanjing Normal University, 1 Wenyuan Road, Nanjing, 210023, China
| | - Yunfei Sun
- Jiangsu Key Laboratory for Biodiversity and Biotechnology, School of Biological Sciences, Nanjing Normal University, 1 Wenyuan Road, Nanjing, 210023, China
| | - Zhou Yang
- Jiangsu Key Laboratory for Biodiversity and Biotechnology, School of Biological Sciences, Nanjing Normal University, 1 Wenyuan Road, Nanjing, 210023, China.
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2
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Mascarenhas-Melo F, Mathur A, Murugappan S, Sharma A, Tanwar K, Dua K, Singh SK, Mazzola PG, Yadav DN, Rengan AK, Veiga F, Paiva-Santos AC. Inorganic nanoparticles in dermopharmaceutical and cosmetic products: Properties, formulation development, toxicity, and regulatory issues. Eur J Pharm Biopharm 2023; 192:25-40. [PMID: 37739239 DOI: 10.1016/j.ejpb.2023.09.011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2023] [Revised: 09/03/2023] [Accepted: 09/19/2023] [Indexed: 09/24/2023]
Abstract
The use of nanotechnology strategies is a current hot topic, and research in this field has been growing significantly in the cosmetics industry. Inorganic nanoparticles stand out in this context for their distinctive physicochemical properties, leading in particular to an increased refractive index and absorption capacity giving them a broad potential for cutaneous applications and making them of special interest in research for dermopharmaceutical and cosmetic purposes. This performance is responsible for its heavy inclusion in the manufacture of skin health products such as sunscreens, lotions, beauty creams, skin ointments, makeup, and others. In particular, their suitable bandgap energy characteristics allow them to be used as photocatalytic semiconductors. They provide excellent UV absorption, commonly known as UV filters, and are responsible for their wide worldwide use in sunscreen formulations without the undesirable white residue after consumer application. In addition, cosmetics based on inorganic nanoparticles have several additional characteristics relevant to formulation development, such as being less expensive compared to other nanomaterials, having greater stability, and ensuring less irritation, itching, and propensity for skin allergies. This review will address in detail the main inorganic nanoparticles used in dermopharmaceutical and cosmetic products, such as titanium dioxide, zinc oxide, silicon dioxide, silver, gold, copper, and aluminum nanoparticles, nanocrystals, and quantum dots, reporting their physicochemical characteristics, but also their additional intrinsic properties that contribute to their use in this type of formulations. Safety issues regarding inorganic nanoparticles, based on toxicity studies, both to humans and the environment, as well as regulatory affairs associated with their use in dermopharmaceuticals and cosmetics, will be addressed.
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Affiliation(s)
- Filipa Mascarenhas-Melo
- Department of Pharmaceutical Technology, Faculty of Pharmacy of the University of Coimbra, University of Coimbra, Coimbra, Portugal; REQUIMTE/LAQV, Group of Pharmaceutical Technology, Faculty of Pharmacy of the University of Coimbra, University of Coimbra, Coimbra, Portugal.
| | - Ankita Mathur
- Abode Biotec India Private Limited, Hyderbad, Telangana, India
| | - Sivasubramanian Murugappan
- Department of Biomedical Engineering, Indian Institute of Technology Hyderabad, Sangareddy, Telangana, India; Department of Physics, Faculty of Science and Engineering, Bernal Institute, University of Limerick, Limerick, Ireland
| | - Arpana Sharma
- Department of Life Sciences, Mewar University, Gangrar, Rajasthan, India
| | | | - Kamal Dua
- Discipline of Pharmacy, Graduate School of Health, University of Technology Sydney, Ultimo, NSW 2007, Australia; Faculty of Health, Australian Research Centre in Complementary and Integrative Medicine, University of Technology Sydney, Ultimo, NSW 2007, Australia
| | - Sachin Kumar Singh
- Faculty of Health, Australian Research Centre in Complementary and Integrative Medicine, University of Technology Sydney, Ultimo, NSW 2007, Australia; School of Pharmaceutical Sciences, Lovely Professional University, Phagwara, Punjab-144411, India
| | | | - Dokkari Nagalaxmi Yadav
- Department of Biomedical Engineering, Indian Institute of Technology Hyderabad, Sangareddy, Telangana, India
| | - Aravind Kumar Rengan
- Department of Biomedical Engineering, Indian Institute of Technology Hyderabad, Sangareddy, Telangana, India
| | - Francisco Veiga
- Department of Pharmaceutical Technology, Faculty of Pharmacy of the University of Coimbra, University of Coimbra, Coimbra, Portugal; REQUIMTE/LAQV, Group of Pharmaceutical Technology, Faculty of Pharmacy of the University of Coimbra, University of Coimbra, Coimbra, Portugal
| | - Ana Cláudia Paiva-Santos
- Department of Pharmaceutical Technology, Faculty of Pharmacy of the University of Coimbra, University of Coimbra, Coimbra, Portugal; REQUIMTE/LAQV, Group of Pharmaceutical Technology, Faculty of Pharmacy of the University of Coimbra, University of Coimbra, Coimbra, Portugal.
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3
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Bai YY, Yang YJ, Xu Y, Yang XY, Zhang ZL. Current Lifetime of Single-Nanoparticle Electrochemical Collision for In Situ Monitoring Nanoparticles Agglomeration and Aggregation. Anal Chem 2023; 95:4429-4434. [PMID: 36812093 DOI: 10.1021/acs.analchem.2c05016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/24/2023]
Abstract
In situ monitoring of the agglomeration/aggregation process of nanoparticles (NPs) is crucial because it seriously affects cell entry, biosafety, catalytic performance of NPs, and so on. Nevertheless, it remains hard to monitor the solution phase agglomeration/aggregation of NPs via conventional techniques such as electron microscopy, which requires sample pretreatment and cannot represent native state NPs in solution. Considering that single-nanoparticle electrochemical collision (SNEC) is powerful to detect NPs in solution at the single-particle level, and the current lifetime, which refers to the time that current intensity decays to 1/e of the original value, is skilled in distinguishing different sized NPs, herein, a current lifetime-based SNEC has been developed to distinguish a single Au NP (d = 18 nm) from its agglomeration/aggregation. Based on this, the agglomeration/aggregation process of small-sized NPs and the discrimination of agglomeration vs aggregation have been carefully investigated at the single-particle level. Results showed that the agglomeration/aggregation of Au NPs (d = 18 nm) in 0.8 mM HClO4 climbed from 19% to 69% over two hours, whereas there was no visible granular sediment, and Au NPs tended to agglomerate rather than aggregate irreversibly under normal conditions. Hence, the proposed current lifetime-based SNEC could serve as a complementary method to in situ monitor the agglomeration/aggregation of small-sized NPs in solution at the single-particle level and provide effective guidance for the practical application of NPs.
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Affiliation(s)
- Yi-Yan Bai
- College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, People's Republic of China.,Department of Chemistry, Yuncheng University, Yuncheng 044000, People's Republic of China
| | - Yan-Ju Yang
- College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, People's Republic of China
| | - Ying Xu
- College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, People's Republic of China
| | - Xiao-Yan Yang
- College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, People's Republic of China
| | - Zhi-Ling Zhang
- College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, People's Republic of China
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Javaid A, Jalalah M, Safdar R, Khaliq Z, Qadir MB, Zulfiqar S, Ahmad A, Satti AN, Ali A, Faisal M, Alsareii SA, Harraz FA. Ginger Loaded Polyethylene Oxide Electrospun Nanomembrane: Rheological and Antimicrobial Attributes. MEMBRANES 2022; 12:membranes12111148. [PMID: 36422140 PMCID: PMC9696929 DOI: 10.3390/membranes12111148] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/03/2022] [Revised: 11/01/2022] [Accepted: 11/08/2022] [Indexed: 05/29/2023]
Abstract
Synthetic antibiotics have captured the market in recent years, but the side effects of these products are life-threatening. In recent times, researchers have focused their research on natural-based products such as natural herbal oils, which are eco-friendly, biocompatible, biodegradable, and antibacterial. In this study, polyethylene oxide (PEO) and aqueous ginger extract (GE) were electrospun to produce novel antibacterial nanomembrane sheets as a function of PEO and GE concentrations. A GE average particle size of 91.16 nm was achieved with an extensive filtration process, inferring their incorporation in the PEO nanofibres. The presence of the GE was confirmed by Fourier transform infrared spectroscopy (FTIR) through peaks of phenol and aromatic groups. The viscoelastic properties of PEO/GE solutions were analysed in terms of PEO and GE concentrations. Increasing PEO and GE concentrations increased the solution's viscosity. The dynamic viscosity of 3% was not changed with increasing shear rate, indicating Newtonian fluid behaviour. The dynamic viscosity of 4 and 5 wt% PEO/GE solutions containing 10% GE increased exponentially compared to 3 wt%. In addition, the shear thinning behaviour was observed over a frequency range of 0.05 to 100 rad/s. Scanning Electron Microscopy (SEM) analysis also specified an increase in the nanofibre's diameter with increasing PEO concentration, while SEM images displayed smooth morphology with beadless nanofibres at different PEO/GE concentrations. In addition, PEO/GE nanomembranes inhibited the growth of Staphylococcus aureus, as presented by qualitative antibacterial results. The extent of PEO/GE nanomembrane's antibacterial activity was further investigated by the agar dilution method, which inhibited the 98.79% Staphylococcus aureus population at 30% GE concentration.
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Affiliation(s)
- Anum Javaid
- Department of Materials, National Textile University, Faisalabad 37610, Pakistan
| | - Mohammed Jalalah
- Promising Centre for Sensors and Electronic Devices (PCSED), Advanced Materials and Nano-Research Centre, Najran University, P.O. Box 1988, Najran 11001, Saudi Arabia
- Department of Electrical Engineering, College of Engineering, Najran University, P.O. Box 1988, Najran 11001, Saudi Arabia
| | - Rimsha Safdar
- Department of Materials, National Textile University, Faisalabad 37610, Pakistan
| | - Zubair Khaliq
- Department of Materials, National Textile University, Faisalabad 37610, Pakistan
| | - Muhammad Bilal Qadir
- Department of Textile Engineering, National Textile University, Faisalabad 37610, Pakistan
| | - Sumra Zulfiqar
- Department of Materials, National Textile University, Faisalabad 37610, Pakistan
| | - Adnan Ahmad
- Department of Textile Engineering, National Textile University, Faisalabad 37610, Pakistan
| | - Aamir Naseem Satti
- U.S.-PAKISTAN Center for Advanced Studies in Energy (USPCASE), National University of Science and Technology, Islamabad 44000, Pakistan
| | - Aiman Ali
- Department of Materials, National Textile University, Faisalabad 37610, Pakistan
| | - M. Faisal
- Promising Centre for Sensors and Electronic Devices (PCSED), Advanced Materials and Nano-Research Centre, Najran University, P.O. Box 1988, Najran 11001, Saudi Arabia
- Department of Chemistry, Faculty of Science and Arts, Najran University, P.O. Box 1988, Najran 11001, Saudi Arabia
| | - S. A. Alsareii
- Promising Centre for Sensors and Electronic Devices (PCSED), Advanced Materials and Nano-Research Centre, Najran University, P.O. Box 1988, Najran 11001, Saudi Arabia
- Department of Surgery, College of Medicine, Najran University, P.O. Box 1988, Najran 11001, Saudi Arabia
| | - Farid A. Harraz
- Promising Centre for Sensors and Electronic Devices (PCSED), Advanced Materials and Nano-Research Centre, Najran University, P.O. Box 1988, Najran 11001, Saudi Arabia
- Department of Chemistry, Faculty of Science and Arts, Sharurah, Najran University, Sharurah 68342, Saudi Arabia
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5
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García-Sánchez S, Gala M, Žoldák G. Nanoimpact in Plants: Lessons from the Transcriptome. PLANTS 2021; 10:plants10040751. [PMID: 33921390 PMCID: PMC8068866 DOI: 10.3390/plants10040751] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/12/2021] [Revised: 03/30/2021] [Accepted: 04/08/2021] [Indexed: 12/12/2022]
Abstract
Transcriptomics studies are available to evaluate the potential toxicity of nanomaterials in plants, and many highlight their effect on stress-responsive genes. However, a comparative analysis of overall expression changes suggests a low impact on the transcriptome. Environmental challenges like pathogens, saline, or drought stress induce stronger transcriptional responses than nanoparticles. Clearly, plants did not have the chance to evolve specific gene regulation in response to novel nanomaterials; but they use common regulatory circuits with other stress responses. A shared effect with abiotic stress is the inhibition of genes for root development and pathogen response. Other works are reviewed here, which also converge on these results.
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Affiliation(s)
- Susana García-Sánchez
- Center for Interdisciplinary Biosciences, Technology, and Innovation Park P.J. Šafárik University, Trieda SNP 1, 040 11 Košice, Slovakia
- Correspondence: (S.G.-S.); (G.Ž.)
| | - Michal Gala
- Department of Biophysics, Faculty of Science, P. J. Šafárik University, Jesenna 5, 040 01 Košice, Slovakia;
| | - Gabriel Žoldák
- Center for Interdisciplinary Biosciences, Technology, and Innovation Park P.J. Šafárik University, Trieda SNP 1, 040 11 Košice, Slovakia
- Correspondence: (S.G.-S.); (G.Ž.)
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6
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The Influence of Bovine Serum Albumin Modified Titanium Dioxide Nanoparticles on Myoblast Cytotoxicity. Pharm Chem J 2020. [DOI: 10.1007/s11094-020-02292-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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7
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Ozturk K, Arslan FB, Tavukcuoglu E, Esendagli G, Calis S. Aggregation of chitosan nanoparticles in cell culture: Reasons and resolutions. Int J Pharm 2020; 578:119119. [DOI: 10.1016/j.ijpharm.2020.119119] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2019] [Revised: 02/03/2020] [Accepted: 02/04/2020] [Indexed: 12/12/2022]
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8
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Khan AO, Di Maio A, Guggenheim EJ, Chetwynd AJ, Pencross D, Tang S, Belinga-Desaunay MFA, Thomas SG, Rappoport JZ, Lynch I. Surface Chemistry-Dependent Evolution of the Nanomaterial Corona on TiO 2 Nanomaterials Following Uptake and Sub-Cellular Localization. NANOMATERIALS 2020; 10:nano10030401. [PMID: 32106393 PMCID: PMC7152854 DOI: 10.3390/nano10030401] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/18/2020] [Revised: 02/20/2020] [Accepted: 02/20/2020] [Indexed: 12/14/2022]
Abstract
Nanomaterial (NM) surface chemistry has an established and significant effect on interactions at the nano-bio interface, with important toxicological consequences for manufactured NMs, as well as potent effects on the pharmacokinetics and efficacy of nano-therapies. In this work, the effects of different surface modifications (PVP, Dispex AA4040, and Pluronic F127) on the uptake, cellular distribution, and degradation of titanium dioxide NMs (TiO2 NMs, ~10 nm core size) are assessed and correlated with the localization of fluorescently-labeled serum proteins forming their coronas. Imaging approaches with an increasing spatial resolution, including automated high throughput live cell imaging, correlative confocal fluorescence and reflectance microscopy, and dSTORM super-resolution microscopy, are used to explore the cellular fate of these NMs and their associated serum proteins. Uncoated TiO2 NMs demonstrate a rapid loss of corona proteins, while surface coating results in the retention of the corona signal after internalization for at least 24 h (varying with coating composition). Imaging with two-color super-resolution dSTORM revealed that the apparent TiO2 NM single agglomerates observed in diffraction-limited confocal microscopy are actually adjacent smaller agglomerates, and provides novel insights into the spatial arrangement of the initial and exchanged coronas adsorbed at the NM surfaces.
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Affiliation(s)
- Abdullah O. Khan
- Institute of Cardiovascular Science, College of Medical Dental Sciences, University of Birmingham, Birmingham B15 2TT, UK; (A.O.K.); (D.P.); (S.G.T.)
| | - Alessandro Di Maio
- School of Biosciences, University of Birmingham, Birmingham B15 2TT, UK;
| | - Emily J. Guggenheim
- School of Geography, Earth and Environmental Sciences, University of Birmingham, Birmingham B15 2TT, UK; (E.J.G.); (A.J.C.); (M.-F.A.B.-D.)
| | - Andrew J. Chetwynd
- School of Geography, Earth and Environmental Sciences, University of Birmingham, Birmingham B15 2TT, UK; (E.J.G.); (A.J.C.); (M.-F.A.B.-D.)
| | - Dan Pencross
- Institute of Cardiovascular Science, College of Medical Dental Sciences, University of Birmingham, Birmingham B15 2TT, UK; (A.O.K.); (D.P.); (S.G.T.)
| | - Selina Tang
- Promethean Particles Ltd., 1-3 Genesis Park, Midland Way, Nottingham NG7 3EF, UK;
| | - Marie-France A. Belinga-Desaunay
- School of Geography, Earth and Environmental Sciences, University of Birmingham, Birmingham B15 2TT, UK; (E.J.G.); (A.J.C.); (M.-F.A.B.-D.)
| | - Steven G. Thomas
- Institute of Cardiovascular Science, College of Medical Dental Sciences, University of Birmingham, Birmingham B15 2TT, UK; (A.O.K.); (D.P.); (S.G.T.)
| | - Joshua Z. Rappoport
- Boston College, Higgins 644A, 140 Commonwealth Ave, Chestnut Hill, MA 02467, USA
| | - Iseult Lynch
- School of Geography, Earth and Environmental Sciences, University of Birmingham, Birmingham B15 2TT, UK; (E.J.G.); (A.J.C.); (M.-F.A.B.-D.)
- Correspondence:
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Subramaniam VD, Prasad SV, Banerjee A, Gopinath M, Murugesan R, Marotta F, Sun XF, Pathak S. Health hazards of nanoparticles: understanding the toxicity mechanism of nanosized ZnO in cosmetic products. Drug Chem Toxicol 2019; 42:84-93. [PMID: 30103634 DOI: 10.1080/01480545.2018.1491987] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
In recent years, nanoparticles are being used extensively in personal healthcare products such as cosmetics, sunscreens, soaps, and shampoos. Particularly, metal oxide nanoparticles are gaining competence as key industrial constituents, progressing toward a remarkable rise in their applications. Zinc oxide and titanium oxide nanoparticles are the most commonly employed metal oxide nanoparticles in sunscreens, ointments, foot care, and over the counter topical products. Dermal exposure to these metal oxides predominantly occurs through explicit use of cosmetic products and airway exposure to nanoparticle dusts is primarily mediated via occupational exposure. There is a compelling need to understand the toxicity effects of nanoparticles which can easily enter the cells and induce oxidative stress. Consequently, these products have become a direct source of pollution in the environment and thereby greatly impact our ecosystem. A complete understanding of the toxicity mechanism of nano-ZnO is intended to resolve whether and to what extent such nanoparticles may pose a threat to the environment and to human beings. In this review article, we have discussed the characteristics of metal oxide nanoparticles and its applications in the cosmetic industry. We have also highlighted about their toxicity effects and their impact on human health.
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Affiliation(s)
- Vimala Devi Subramaniam
- a Chettinad Hospital & Research Institute (CHRI), Chettinad Academy of Research and Education (CARE) , Kelambakkam , Chennai , India
| | - Suhanya Veronica Prasad
- a Chettinad Hospital & Research Institute (CHRI), Chettinad Academy of Research and Education (CARE) , Kelambakkam , Chennai , India
| | - Antara Banerjee
- a Chettinad Hospital & Research Institute (CHRI), Chettinad Academy of Research and Education (CARE) , Kelambakkam , Chennai , India
| | - Madhumala Gopinath
- a Chettinad Hospital & Research Institute (CHRI), Chettinad Academy of Research and Education (CARE) , Kelambakkam , Chennai , India
| | - Ramachandran Murugesan
- a Chettinad Hospital & Research Institute (CHRI), Chettinad Academy of Research and Education (CARE) , Kelambakkam , Chennai , India
| | - Francesco Marotta
- b ReGentra R&d international for Aging Intervention , Milano-Beijing & VCC, Preventitive Medical Promotion Foundation , Beijing , China
| | - Xiao-Feng Sun
- c Department of Oncology and Department of Clinical and Experimental Medicine , University of Linköping , Linköping , Sweden
| | - Surajit Pathak
- a Chettinad Hospital & Research Institute (CHRI), Chettinad Academy of Research and Education (CARE) , Kelambakkam , Chennai , India
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Martinez-Haya R, Sabater C, Castillo MÁ, Miranda MA, Marin ML. A mechanistic study on the potential of quinolinium salts as photocatalysts for the abatement of chlorinated pollutants. JOURNAL OF HAZARDOUS MATERIALS 2018; 351:277-284. [PMID: 29554524 DOI: 10.1016/j.jhazmat.2018.03.010] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/22/2017] [Revised: 02/28/2018] [Accepted: 03/06/2018] [Indexed: 06/08/2023]
Abstract
Photocatalytic degradation of three highly chlorinated contaminants, namely 2,4,6-trichlorophenol (TCP), 2,4,6-trichloroanisole (TCA) and 5-chloro-2-(2,4-dichlorophenoxy)phenol (triclosan, TCS) has been investigated in the presence of N-methylquinolinium tetrafluoroborate (NMQ+), a photocatalyst able to act via Type I or Type II mechanism. Photodegradation of contaminants under aerobic conditions was achieved within hours; and it was accompanied by mineralization, as demonstrated by trapping of the evolved carbon dioxide as barium carbonate. Moreover, a high degree of detoxification, based on % inmobilization of daphnids (Daphnia magna bioassay), was reached after 70 h of irradiation. Quenching of the NMQ+ fluorescence by the pollutants was evidenced by a decrease in the emission intensity and lifetime. Detection of the reduced NMQ· by laser flash photolysis in the presence of the pollutants provided an unambigous evidence of the electron transfer process. Quenching of singlet oxygen by the contaminants showed the typical singlet oxygen quenching constants (105-106 M-1 s-1). Evaluation of the relative contribution of both pathways (Type I vs Type II) point to the photodegradation occurring via a Type I mechanism, being the contribution of Type II mechanism negligible at any concentration range.
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Affiliation(s)
- Rebeca Martinez-Haya
- Instituto de Tecnología Química, Universitat Politècnica de València-Consejo Superior de Investigaciones Científicas, Avda. de los Naranjos s/n, E-46022, Valencia, Spain
| | - Consuelo Sabater
- Departamento de Biotecnología, Universitat Politècnica de València, Camino de Vera s/n, E-46022 Valencia, Spain
| | - Maria-Ángeles Castillo
- Departamento de Biotecnología, Universitat Politècnica de València, Camino de Vera s/n, E-46022 Valencia, Spain
| | - Miguel A Miranda
- Instituto de Tecnología Química, Universitat Politècnica de València-Consejo Superior de Investigaciones Científicas, Avda. de los Naranjos s/n, E-46022, Valencia, Spain.
| | - M Luisa Marin
- Instituto de Tecnología Química, Universitat Politècnica de València-Consejo Superior de Investigaciones Científicas, Avda. de los Naranjos s/n, E-46022, Valencia, Spain.
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11
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Venkatesan AK, Reed RB, Lee S, Bi X, Hanigan D, Yang Y, Ranville JF, Herckes P, Westerhoff P. Detection and Sizing of Ti-Containing Particles in Recreational Waters Using Single Particle ICP-MS. BULLETIN OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY 2018; 100:120-126. [PMID: 29164274 DOI: 10.1007/s00128-017-2216-1] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/02/2017] [Accepted: 11/15/2017] [Indexed: 06/07/2023]
Abstract
Single particle inductively coupled plasma mass spectrometry (spICP-MS) was used to detect Ti-containing particles in heavily-used bathing areas of a river (Salt River) and five swimming pools. Ti-containing particle concentrations in swimming pools ranged from 2.8 × 103 to 4.4 × 103 particles/mL and were an order of magnitude lower than those detected in the Salt River. Measurements from the Salt River showed an 80% increase in Ti-containing particle concentration over baseline concentration during peak recreational activity (at 16:00 h) in the river. Cloud point extraction followed by transmission electron microscopy with energy dispersive X-ray analysis confirmed presence of aggregated TiO2 particles in river samples, showing morphological similarity to particles present in an over-the-counter sunscreen product. The maximum particle mass concentration detected in a sample from the Salt River (659 ng/L) is only slightly lower than the predicted no effect concentration for TiO2 to aquatic organisms (< 1 μg/L).
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Affiliation(s)
- Arjun K Venkatesan
- School of Sustainable Engineering and the Built Environment, Arizona State University, Tempe, AZ, 85287-3005, USA.
- Center for Clean Water Technology, Department of Civil Engineering, Stony Brook University, Stony Brook, NY, 11794, USA.
| | - Robert B Reed
- School of Sustainable Engineering and the Built Environment, Arizona State University, Tempe, AZ, 85287-3005, USA
- Department of Chemistry and Geochemistry, Colorado School of Mines, Golden, CO, 80401, USA
| | - Sungyun Lee
- School of Sustainable Engineering and the Built Environment, Arizona State University, Tempe, AZ, 85287-3005, USA
- Environmental System Research Division, Korea Institute of Machinery and Materials, Daejeon, 34103, Republic of Korea
| | - Xiangyu Bi
- School of Sustainable Engineering and the Built Environment, Arizona State University, Tempe, AZ, 85287-3005, USA
| | - David Hanigan
- School of Sustainable Engineering and the Built Environment, Arizona State University, Tempe, AZ, 85287-3005, USA
- Department of Civil and Environmental Engineering, University of Nevada, Reno, NV, 89557-0258, USA
| | - Yu Yang
- School of Sustainable Engineering and the Built Environment, Arizona State University, Tempe, AZ, 85287-3005, USA
| | - James F Ranville
- Department of Chemistry and Geochemistry, Colorado School of Mines, Golden, CO, 80401, USA
| | - Pierre Herckes
- School of Molecular Sciences, Arizona State University, Tempe, AZ, 85287-1604, USA
| | - Paul Westerhoff
- School of Sustainable Engineering and the Built Environment, Arizona State University, Tempe, AZ, 85287-3005, USA
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12
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Afshinnia K, Baalousha M. Effect of phosphate buffer on aggregation kinetics of citrate-coated silver nanoparticles induced by monovalent and divalent electrolytes. THE SCIENCE OF THE TOTAL ENVIRONMENT 2017; 581-582:268-276. [PMID: 28043699 DOI: 10.1016/j.scitotenv.2016.12.117] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/12/2016] [Revised: 12/17/2016] [Accepted: 12/17/2016] [Indexed: 06/06/2023]
Abstract
The attachment efficiency (α) is an important parameter that can be used to characterize nanoparticle (NPs) aggregation behavior and has been a topic of discussion of several papers in the past few years. The importance of α is because it is one of the key parameters that can be used to model NP environmental fate and behavior. This study uses UV-vis and laser Doppler electrophoresis to monitor the aggregation behavior of citrate-coated silver nanoparticles (cit-AgNPs) induced by Na+ and Ca2+ as counter ions in the presence and absence of Suwannee River fulvic acid (SRFA) as a surrogate of natural organic matter and different concentrations of phosphate buffer (0-1mM). Results demonstrate that phosphate buffer, which serves to maintain pH nearly constant over the course of a reaction, is an important determinant of NP aggregation behavior. Increasing phosphate buffer concentration results in a decrease in the critical coagulation concentrations (CCC) of cit-AgNPs to lower counter ion concentration and an increase of α at the same counter ion concentration, both in the absence and presence of SRFA. SRFA stabilizes AgNPs and increases the CCC to higher counter ion concentrations. The outcome of this study can be used to rationalize the variation in α and CCC values reported in the literature for NPs with similar physicochemical properties, where different α and CCC values are reported when different types of buffers and buffer concentrations are used in different studies.
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Affiliation(s)
- K Afshinnia
- Center for Environmental Nanoscience and Risk, Department of Environmental Health Sciences, Arnold School of Public Health, University South Carolina, Columbia, SC 29208, USA
| | - M Baalousha
- Center for Environmental Nanoscience and Risk, Department of Environmental Health Sciences, Arnold School of Public Health, University South Carolina, Columbia, SC 29208, USA.
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13
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von Moos N, Koman VB, Santschi C, Martin OJF, Maurizi L, Jayaprakash A, Bowen P, Slaveykova VI. Pro-oxidant effects of nano-TiO2on Chlamydomonas reinhardtii during short-term exposure. RSC Adv 2016. [DOI: 10.1039/c6ra16639c] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023] Open
Abstract
This is the first continuous quantification of abiotic and biotic nano-TiO2– stimulated H2O2revealing that measured extracellular and intracellular pro-oxidant endpoints inC. reinhardtiican differ significantly.
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Affiliation(s)
- Nadia von Moos
- Environmental Biogeochemistry and Ecotoxicology
- Department F.-A. Forel for Environmental and Aquatic Sciences
- School of Earth and Environmental Science
- University of Geneva
- Uni Carl Vogt
| | - Volodymyr B. Koman
- Nanophotonics and Metrology Laboratory
- Swiss Federal Institute of Technology Lausanne (EPFL)
- CH-1015 Lausanne
- Switzerland
| | - Christian Santschi
- Nanophotonics and Metrology Laboratory
- Swiss Federal Institute of Technology Lausanne (EPFL)
- CH-1015 Lausanne
- Switzerland
| | - Olivier J. F. Martin
- Nanophotonics and Metrology Laboratory
- Swiss Federal Institute of Technology Lausanne (EPFL)
- CH-1015 Lausanne
- Switzerland
| | - Lionel Maurizi
- Powder Technology Laboratory
- Institute of Materials
- Swiss Federal Institute of Technology Lausanne (EPFL)
- CH-1015 Lausanne
- Switzerland; ; Tel: +41 21 69 36902
| | - Amarnath Jayaprakash
- Powder Technology Laboratory
- Institute of Materials
- Swiss Federal Institute of Technology Lausanne (EPFL)
- CH-1015 Lausanne
- Switzerland; ; Tel: +41 21 69 36902
| | - Paul Bowen
- Powder Technology Laboratory
- Institute of Materials
- Swiss Federal Institute of Technology Lausanne (EPFL)
- CH-1015 Lausanne
- Switzerland; ; Tel: +41 21 69 36902
| | - Vera I. Slaveykova
- Environmental Biogeochemistry and Ecotoxicology
- Department F.-A. Forel for Environmental and Aquatic Sciences
- School of Earth and Environmental Science
- University of Geneva
- Uni Carl Vogt
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14
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Liu HH, Lanphere J, Walker S, Cohen Y. Effect of hydration repulsion on nanoparticle agglomeration evaluated via a constant number Monte-Carlo simulation. NANOTECHNOLOGY 2015; 26:045708. [PMID: 25566787 DOI: 10.1088/0957-4484/26/4/045708] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The effect of hydration repulsion on the agglomeration of nanoparticles in aqueous suspensions was investigated via the description of agglomeration by the Smoluchowski coagulation equation using constant number Monte-Carlo simulation making use of the classical DLVO theory extended to include the hydration repulsion energy. Evaluation of experimental DLS measurements for TiO2, CeO2, SiO2, and α-Fe2O3 (hematite) at high IS (up to 900 mM) or low |ζ-potential| (≥1.35 mV) demonstrated that hydration repulsion energy can be above electrostatic repulsion energy such that the increased overall repulsion energy can significantly lower the agglomerate diameter relative to the classical DLVO prediction. While the classical DLVO theory, which is reasonably applicable for agglomeration of NPs of high |ζ-potential| (∼>35 mV) in suspensions of low IS (∼<1 mM), it can overpredict agglomerate sizes by up to a factor of 5 at high IS or low |ζ-potential|. Given the potential important role of hydration repulsion over a range of relevant conditions, there is merit in quantifying this repulsion energy over a wide range of conditions as part of overall characterization of NP suspensions. Such information would be of relevance to improved understanding of NP agglomeration in aqueous suspensions and its correlation with NP physicochemical and solution properties.
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Affiliation(s)
- Haoyang Haven Liu
- Center for the Environmental Implications of Nanotechnology, California NanoSystems Institute, University of California, Los Angeles, Los Angeles, CA 90095, USA. Chemical and Biomolecular Engineering Department, University of California, Los Angeles, Los Angeles, CA 90095, USA
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15
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Stiefel C, Schwack W. Photoprotection in changing times - UV filter efficacy and safety, sensitization processes and regulatory aspects. Int J Cosmet Sci 2014; 37:2-30. [DOI: 10.1111/ics.12165] [Citation(s) in RCA: 54] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2014] [Accepted: 09/20/2014] [Indexed: 12/14/2022]
Affiliation(s)
- C. Stiefel
- Institute of Food Chemistry; University of Hohenheim; Garbenstrasse 28 70599 Stuttgart Germany
| | - W. Schwack
- Institute of Food Chemistry; University of Hohenheim; Garbenstrasse 28 70599 Stuttgart Germany
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16
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Majedi SM, Kelly BC, Lee HK. Role of combinatorial environmental factors in the behavior and fate of ZnO nanoparticles in aqueous systems: a multiparametric analysis. JOURNAL OF HAZARDOUS MATERIALS 2014; 264:370-379. [PMID: 24316809 DOI: 10.1016/j.jhazmat.2013.11.015] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/03/2013] [Revised: 10/14/2013] [Accepted: 11/10/2013] [Indexed: 06/02/2023]
Abstract
To better understand the environmental behavior, fate, and exposure risks of engineered nanoparticles in aquatic systems, for the first time, combinatorial aqueous systems were established using three-level orthogonal array design (OAD), an OA27 (3(1)(3)) matrix, to assess the effects of six co-varying environmental factors (organic acid type, organic acid concentration, NP concentration, pH, salt content, and electrolyte type) on the aggregation of commercial zinc oxide nanoparticles (ZnO NPs, mean diameter ∼41nm). A separate set of OA27 (3(1)(3)) experiments including temperature was conducted for the dissolution of these NPs. The results showed that the organic acid concentration and the pH were the most significant factors (p<0.001) influencing aggregation and dissolution of ZnO NPs, respectively. The electrolyte type and the salt content were the next most important factors in both the aggregation and dissolution. Based on the kinetics study of the aggregation, a high rate of the NP aggregation resulted in decreased dissolution, such that observed in the presence of calcium chloride. Clear temperature-induced aggregation and reduced dissolution were further observed with increasing temperature. This approach demonstrates that the behavior of ZnO NP may vary substantially under combinatorial environmental conditions.
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Affiliation(s)
- Seyed Mohammad Majedi
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543, Singapore
| | - Barry C Kelly
- Department of Civil and Environmental Engineering, National University of Singapore, 1 Engineering Drive 2, Singapore 117576, Singapore
| | - Hian Kee Lee
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543, Singapore; National University of Singapore Environmental Research Institute, T-Lab Building #02-01, 5A Engineering Drive 1, Singapore 117411, Singapore.
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17
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Mohammadyari A, Razavipour S, Mohammadbeigi M, Negahdary M, Ajdary M. Exploring vivo toxicity assessment of copper oxide nanoparticle in Wistar rats. ACTA ACUST UNITED AC 2014. [DOI: 10.15412/j.jbtw.01030601] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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18
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Comparison of cellular uptake and inflammatory response via toll-like receptor 4 to lipopolysaccharide and titanium dioxide nanoparticles. Int J Mol Sci 2013; 14:13154-70. [PMID: 23803652 PMCID: PMC3742180 DOI: 10.3390/ijms140713154] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2013] [Revised: 06/10/2013] [Accepted: 06/17/2013] [Indexed: 01/09/2023] Open
Abstract
The innate immune response is the earliest cellular response to infectious agents and mediates the interactions between microbes and cells. Toll-like receptors (TLRs) play an important role in these interactions. We have already shown that TLRs are involved with the uptake of titanium dioxide nanoparticles (TiO2 NPs) and promote inflammatory responses. In this paper, we compared role of cellular uptake and inflammatory response via TLR 4 to lipopolysaccharide (LPS) and TiO2 NPs. In the case of LPS, LPS binds to LPS binding protein (LBP) and CD 14, and then this complex binds to TLR 4. In the case of TiO2 NPs, the necessity of LBP and CD 14 to induce the inflammatory response and for uptake by cells was investigated using over-expression, antibody blocking, and siRNA knockdown experiments. Our results suggested that for cellular uptake of TiO2 NPs, TLR 4 did not form a complex with LBP and CD 14. In the TiO2 NP-mediated inflammatory response, TLR 4 acted as the signaling receptor without protein complex of LPS, LBP and CD 14. The results suggested that character of TiO2 NPs might be similar to the complex of LPS, LBP and CD 14. These results are important for development of safer nanomaterials.
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19
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Exopolysaccharides protect Synechocystis against the deleterious effects of titanium dioxide nanoparticles in natural and artificial waters. J Colloid Interface Sci 2013; 405:35-43. [PMID: 23777864 DOI: 10.1016/j.jcis.2013.05.061] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2013] [Revised: 04/29/2013] [Accepted: 05/04/2013] [Indexed: 12/25/2022]
Abstract
We have studied the effect of TiO2 nanoparticles (NPs) on the model cyanobacteria Synechocystis PCC6803. We used well-characterized NPs suspensions in artificial and natural (Seine River, France) waters. We report that NPs trigger direct (cell killing) and indirect (cell sedimentation precluding the capture of light, which is crucial to photosynthesis) deleterious effects. Both toxic effects increase with NPs concentration and are exacerbated by the presence of UVAs that increase the production of Reactive Oxygen Species (hydroxyl and superoxide radicals) by TiO2 NPs. Furthermore, we compared the responses of the wild-type strain of Synechocystis, which possesses abundant exopolysaccharides surrounding the cells, to that of an EPS-depleted mutant. We show, for the first time, that the exopolysaccharides play a crucial role in Synechocystis protection against cell killing caused by TiO2 NPs.
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20
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Liu R, Rallo R, Weissleder R, Tassa C, Shaw S, Cohen Y. Nano-SAR development for bioactivity of nanoparticles with considerations of decision boundaries. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2013; 9:1842-1852. [PMID: 23423856 DOI: 10.1002/smll.201201903] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/06/2012] [Revised: 11/29/2012] [Indexed: 06/01/2023]
Abstract
The development of classification nano-structure-activity Relationships (nano-SARs) of nanoparticle (NP) bioactivity is presented with the aim of demonstrating the integration of multiparametric toxicity/bioactivity assays to arrive at statistically meaningful class definitions (i.e., bioactivity/inactivity endpoints), as well as the implications of nano-SAR applicability domains and decision boundaries. Nano-SARs are constructed based on a dataset of 44 iron oxide core nanoparticles (NPs), used in molecular imaging and nano-sensing, containing bioactivity profiles for four cell types and four different assays. Class definitions are developed on the basis of 'hit' (i.e., significant bioactivity) identification analysis and self-organizing map based consensus clustering; these class definitions enable construction of nano-SARs of a high classification accuracy (>78%) with different NP descriptor combinations that include primary size, spin-lattice and spin-spin relaxivities, and zeta potentials. Analysis of the nano-SAR performance for different class definitions suggests that H4 (i.e., class with at least four hits) is a reasonable endpoint (from a 'regulatory' viewpoint) for keeping the level of false negatives (i.e., incorrect labeling of bioactive NPs as inactive) low. The establishment of a quantitative nano-SAR applicability domain is demonstrated, making use of a probability density with the H4 class definition and naive Bayesian classifier (NBC) model (with spin-lattice relaxivity and zeta potential as descriptors). Decision boundaries are determined for the above H4/NBC nano-SAR for different acceptance levels of false negative to false positive predictions, illustrating a practical approach that may assist in regulatory decision making with a consideration of reducing the likelihood of identifying bioactive NPs as being inactive.
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Affiliation(s)
- Rong Liu
- Center for the Environmental Implications of Nanotechnology, California Nanosystems Institute, University of California, Los Angeles, CA 90095, USA
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21
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Metabolic effects of TiO2 nanoparticles, a common component of sunscreens and cosmetics, on human keratinocytes. Cell Death Dis 2013; 4:e549. [PMID: 23519118 PMCID: PMC3615742 DOI: 10.1038/cddis.2013.76] [Citation(s) in RCA: 115] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
The long-term health risks of nanoparticles remain poorly understood, which is a serious concern given their prevalence in the environment from increased industrial and domestic use. The extent to which such compounds contribute to cellular toxicity is unclear, and although it is known that induction of oxidative stress pathways is associated with this process, the proteins and the metabolic pathways involved with nanoparticle-mediated oxidative stress and toxicity are largely unknown. To investigate this problem further, the effect of TiO2 on the HaCaT human keratinocyte cell line was examined. The data show that although TiO2 does not affect cell cycle phase distribution, nor cell death, these nanoparticles have a considerable and rapid effect on mitochondrial function. Metabolic analysis was performed to identify 268 metabolites of the specific pathways involved and 85 biochemical metabolites were found to be significantly altered, many of which are known to be associated with the cellular stress response. Importantly, the uptake of nanoparticles into the cultured cells was restricted to phagosomes, TiO2 nanoparticles did not enter into the nucleus or any other cytoplasmic organelle. No other morphological changes were detected after 24-h exposure consistent with a specific role of mitochondria in this response.
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22
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Pereira MM, Raposo NRB, Brayner R, Teixeira EM, Oliveira V, Quintão CCR, Camargo LSA, Mattoso LHC, Brandão HM. Cytotoxicity and expression of genes involved in the cellular stress response and apoptosis in mammalian fibroblast exposed to cotton cellulose nanofibers. NANOTECHNOLOGY 2013; 24:075103. [PMID: 23358497 DOI: 10.1088/0957-4484/24/7/075103] [Citation(s) in RCA: 67] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Cellulose nanofibers (CNF) have mechanical properties that make them very attractive for applications in the construction of polymeric matrices, drug delivery and tissue engineering. However, little is known about their impact on mammalian cells. The objective of this study was to evaluate the cytotoxicity of CNF and their effect on gene expression of fibroblasts cultured in vitro. The morphology of CNF was analyzed by transmission electron microscopy and the surface charge by Zeta potential. Cell viability was analyzed by flow cytometry assay and gene expression of biomarkers focused on cell stress response such as Heat shock protein 70.1 (HSP70.1) and Peroxiredoxin 1 (PRDX1) and apoptosis as B-cell leukemia (BCL-2) and BCL-2 associated X protein (BAX) by RT-PCR assay. Low concentrations of CNF (0.02-100 μg ml(-1)) did not cause cell death; however, at concentrations above 200 μg ml(-1), the nanofibers significantly decreased cell viability (86.41 ± 5.37%). The exposure to high concentrations of CNF (2000 and 5000 μg ml(-1)) resulted in increased HSP70.1, PRDX1 and BAX gene expression. The current study concludes that, under the conditions tested, high concentrations (2000 and 5000 μg ml(-1)) of CNF cause decreased cell viability and affect the expression of stress- and apoptosis-associated molecular markers.
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Affiliation(s)
- M M Pereira
- Nucleus of Analytical Identification and Quantification (NIQUA), Department of Pharmaceutical Sciences, Pharmacy Faculty, Federal University of Juiz de Fora, Juiz de Fora, Brazil.
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23
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Clément L, Hurel C, Marmier N. Toxicity of TiO(2) nanoparticles to cladocerans, algae, rotifers and plants - effects of size and crystalline structure. CHEMOSPHERE 2013; 90:1083-90. [PMID: 23062945 DOI: 10.1016/j.chemosphere.2012.09.013] [Citation(s) in RCA: 180] [Impact Index Per Article: 16.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/28/2012] [Revised: 07/03/2012] [Accepted: 09/08/2012] [Indexed: 05/20/2023]
Abstract
With the rapid development of nanotechnology, there is an increasing risk of human and environmental exposure to nanotechnology-based materials. However, the data on the potential environmental effects of nanoparticles are scarce. The aim of this study is to assess the effect of particle size and crystal structure (anatase and rutile) of titanium dioxide on their toxicity. Thus, acute and chronic toxicity tests included a modified acute test (72 h) using daphnies and algae, rotifers and plants as model organisms. Gradient of toxicity varied with the tested biological organisms. Our results revealed that TiO(2) nanoparticles in anatase crystal structure are toxic in the entire set of tests conducted. However, at highconcentration, through their antimicrobial properties, they significantly promoted growth of roots. Because of its lipophilicity, the rutile crystalline structure of TiO(2) NPs form larger aggregates in aqueous medium; then they have less effect on biological organisms, and thus a lower toxicity than the anatase crystalline form of TiO(2). We also demonstrated that exposure duration, aggregation and concentrations are contributing factors in nanoparticles-mediated toxicity.
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Affiliation(s)
- Laura Clément
- University Nice Sophia Antipolis, ECOMERS, Parc Valrose, 06108 Nice Cedex 02, France
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24
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Yang WW, Li Y, Miao AJ, Yang LY. Cd2+ toxicity as affected by bare TiO2 nanoparticles and their bulk counterpart. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2012; 85:44-51. [PMID: 22975689 DOI: 10.1016/j.ecoenv.2012.08.024] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/13/2012] [Revised: 08/19/2012] [Accepted: 08/20/2012] [Indexed: 06/01/2023]
Abstract
Toxicity of engineered nanoparticles has received extensive attention in recent years. However, nanoparticles always co-exist with other pollutants in natural environment. Whether there are any interactions between these classical pollutants and nanoparticles; and how these interactions may influence the environmental behavior, effects and fate of each other remain largely unclear. For this purpose, effects of bare titanium dioxide engineered nanoparticles (TiO(2)-NP) and their bulk counterpart (TiO(2)-BC) on Cd(2+) bioavailability and toxicity to the green alga Chlamydomonas reinhardtii were examined in the present study. We first investigated the kinetics and equilibrium isotherm of Cd(2+) adsorption on both particles in the algal culture medium. Pseudo-first-order adsorption kinetics was observed with equilibrium rate constant ranging from 0.19 to 0.33min(-1). Increase in Cd(2+) adsorption with its ambient concentration at equilibrium followed a single Langmuir isotherm for different concentrations of TiO(2). Furthermore, surface-area-based Cd(2+) adsorption by TiO(2)-BC was higher than that by TiO(2)-NP in most Cd(2+) concentration treatments suggesting that particle size was not the only cause for different adsorption. Both forms of TiO(2) could alleviate Cd(2+) inhibitive effects on C. reinhardtii. However, Cd(2+) toxicity and its bioaccumulation were comparable as long as its free ion concentration in ambient toxicity media was similar regardless the particle size and concentration of TiO(2). There was no TiO(2) inside the algal cells either. Therefore, it was Cd(2+) adsorption by TiO(2) which decreased its ambient free ion concentration and further its intracellular accumulation as well as toxicity.
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Affiliation(s)
- Wei-Wan Yang
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, Jiangsu Province 210093, China
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25
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Osborne OJ, Johnston BD, Moger J, Balousha M, Lead JR, Kudoh T, Tyler CR. Effects of particle size and coating on nanoscale Ag and TiO2exposure in zebrafish (Danio rerio) embryos. Nanotoxicology 2012; 7:1315-24. [DOI: 10.3109/17435390.2012.737484] [Citation(s) in RCA: 91] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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26
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Ham S, Yoon C, Lee E, Lee K, Park D, Chung E, Kim P, Lee B. Task-based exposure assessment of nanoparticles in the workplace. JOURNAL OF NANOPARTICLE RESEARCH 2012; 14:1126. [PMID: 0 DOI: 10.1007/s11051-012-1126-8] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
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27
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Townley HE, Rapa E, Wakefield G, Dobson PJ. Nanoparticle augmented radiation treatment decreases cancer cell proliferation. NANOMEDICINE-NANOTECHNOLOGY BIOLOGY AND MEDICINE 2012; 8:526-36. [DOI: 10.1016/j.nano.2011.08.003] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/13/2010] [Revised: 08/03/2011] [Accepted: 08/04/2011] [Indexed: 12/13/2022]
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28
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Pagnout C, Jomini S, Dadhwal M, Caillet C, Thomas F, Bauda P. Role of electrostatic interactions in the toxicity of titanium dioxide nanoparticles toward Escherichia coli. Colloids Surf B Biointerfaces 2012; 92:315-21. [DOI: 10.1016/j.colsurfb.2011.12.012] [Citation(s) in RCA: 73] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2011] [Revised: 12/06/2011] [Accepted: 12/06/2011] [Indexed: 11/26/2022]
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29
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Liu HH, Surawanvijit S, Rallo R, Orkoulas G, Cohen Y. Analysis of nanoparticle agglomeration in aqueous suspensions via constant-number Monte Carlo simulation. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2011; 45:9284-92. [PMID: 21916459 DOI: 10.1021/es202134p] [Citation(s) in RCA: 74] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
A constant-number direct simulation Monte Carlo (DSMC) model was developed for the analysis of nanoparticle (NP) agglomeration in aqueous suspensions. The modeling approach, based on the "particles in a box" simulation method, considered both particle agglomeration and gravitational settling. Particle-particle agglomeration probability was determined based on the classical Derjaguin-Landau-Verwey-Overbeek (DLVO) theory and considerations of the collision frequency as impacted by Brownian motion. Model predictions were in reasonable agreement with respect to the particle size distribution and average agglomerate size when compared with dynamic light scattering (DLS) measurements for aqueous TiO(2), CeO(2), and C(60) nanoparticle suspensions over a wide range of pH (3-10) and ionic strength (0.01-156 mM). Simulations also demonstrated, in quantitative agreement with DLS measurements, that nanoparticle agglomerate size increased both with ionic strength and as the solution pH approached the isoelectric point (IEP). The present work suggests that the DSMC modeling approach, along with future use of an extended DLVO theory, has the potential for becoming a practical environmental analysis tool for predicting the agglomeration behavior of aqueous nanoparticle suspensions.
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Affiliation(s)
- Haoyang Haven Liu
- Center for the Environmental Implications of Nanotechnology, California NanoSystems Institute, University of California, Los Angeles, Los Angeles, California 90095, United States
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30
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Ge Y, Bruno M, Wallace K, Winnik W, Prasad RY. Proteome profiling reveals potential toxicity and detoxification pathways following exposure of BEAS-2B cells to engineered nanoparticle titanium dioxide. Proteomics 2011; 11:2406-22. [PMID: 21595037 DOI: 10.1002/pmic.201000741] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2010] [Revised: 03/01/2011] [Accepted: 03/08/2011] [Indexed: 12/22/2022]
Abstract
Oxidative stress is known to play important roles in engineered nanomaterial-induced cellular toxicity. However, the proteins and signaling pathways associated with the engineered nanomaterial-mediated oxidative stress and toxicity are largely unknown. To identify these toxicity pathways and networks that are associated with exposure to engineered nanomaterials, an integrated proteomic study was conducted using human bronchial epithelial cells, BEAS-2B and nanoscale titanium dioxide. Utilizing 2-DE and MS, we identified 46 proteins that were altered at protein expression levels. The protein changes detected by 2-DE/MS were verified by functional protein assays. These identified proteins include some key proteins involved in cellular stress response, metabolism, adhesion, cytoskeletal dynamics, cell growth, cell death, and cell signaling. The differentially expressed proteins were mapped using Ingenuity Pathway Analyses™ canonical pathways and Ingenuity Pathway Analyses tox lists to create protein-interacting networks and proteomic pathways. Twenty protein canonical pathways and tox lists were generated, and these pathways were compared to signaling pathways generated from genomic analyses of BEAS-2B cells treated with titanium dioxide. There was a significant overlap in the specific pathways and lists generated from the proteomic and the genomic data. In addition, we also analyzed the phosphorylation profiles of protein kinases in titanium dioxide-treated BEAS-2B cells for a better understanding of upstream signaling pathways in response to the titanium dioxide treatment and the induced oxidative stress. In summary, the present study provides the first protein-interacting network maps and novel insights into the biological responses and potential toxicity and detoxification pathways of titanium dioxide.
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Affiliation(s)
- Yue Ge
- National Health and Environmental Effects Research Laboratory, U.S. Environmental Protection Agency, NC 27711, USA.
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31
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Cañas JE, Qi B, Li S, Maul JD, Cox SB, Das S, Green MJ. Acute and reproductive toxicity of nano-sized metal oxides (ZnO and TiO2) to earthworms (Eisenia fetida). ACTA ACUST UNITED AC 2011; 13:3351-7. [DOI: 10.1039/c1em10497g] [Citation(s) in RCA: 74] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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Hotze EM, Phenrat T, Lowry GV. Nanoparticle aggregation: challenges to understanding transport and reactivity in the environment. JOURNAL OF ENVIRONMENTAL QUALITY 2010; 39:1909-24. [PMID: 21284288 DOI: 10.2134/jeq2009.0462] [Citation(s) in RCA: 582] [Impact Index Per Article: 41.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Unique forms of manufactured nanomaterials, nanoparticles, and their suspensions are rapidly being created by manipulating properties such as shape, size, structure, and chemical composition and through incorporation of surface coatings. Although these properties make nanomaterial development interesting for new applications, they also challenge the ability of colloid science to understand nanoparticle aggregation in the environment and the subsequent effects on nanomaterial transport and reactivity. This review briefly covers aggregation theory focusing on Derjaguin-Landau-Verwey-Overbeak (DLVO)-based models most commonly used to describe the thermodynamic interactions between two particles in a suspension. A discussion of the challenges to DLVO posed by the properties of nanomaterials follows, along with examples from the literature. Examples from the literature highlighting the importance ofaggregation effects on transport and reactivity and risk of nanoparticles in the environment are discussed.
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Affiliation(s)
- Ernest M Hotze
- Center for Environmental Implications of NanoTechnology (CEINT) and Deps. of Civil & Environmental Engineering, Carnegie Mellon Univ., Pittsburgh, PA 15213-3890, USA
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Effects of titanium dioxide nanoparticle aggregate size on gene expression. Int J Mol Sci 2010; 11:2383-92. [PMID: 20640159 PMCID: PMC2904923 DOI: 10.3390/ijms11062383] [Citation(s) in RCA: 72] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2010] [Revised: 05/19/2010] [Accepted: 06/01/2010] [Indexed: 11/22/2022] Open
Abstract
Titanium dioxide (titania) nanoparticle aggregation is an important factor in understanding cytotoxicity. However, the effect of the aggregate size of nanoparticles on cells is unclear. We prepared two sizes of titania aggregate particles and investigated their biological activity by analyzing biomarker expression based on mRNA expression analysis. The aggregate particle sizes of small and large aggregated titania were 166 nm (PDI = 0.291) and 596 nm (PDI = 0.417), respectively. These two size groups were separated by centrifugation from the same initial nanoparticle sample. We analyzed the gene expression of biomarkers focused on stress, inflammation, and cytotoxicity. Large titania aggregates show a larger effect on cell viability and gene expression when compared with the small aggregates. This suggests that particle aggregate size is related to cellular effects.
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Li G, Lv L, Fan H, Ma J, Li Y, Wan Y, Zhao XS. Effect of the agglomeration of TiO2 nanoparticles on their photocatalytic performance in the aqueous phase. J Colloid Interface Sci 2010; 348:342-7. [PMID: 20580763 DOI: 10.1016/j.jcis.2010.04.045] [Citation(s) in RCA: 97] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2010] [Revised: 04/15/2010] [Accepted: 04/20/2010] [Indexed: 11/25/2022]
Abstract
TiO(2) nanoparticles have been widely explored as photocatalysts in the degradation of organic matters present in water. However, spontaneous agglomeration of TiO(2) nanoparticles in a suspension is a crucial issue that must be addressed before the photocatalyst can be used for water treatment. In the present work, the nature of the agglomeration of TiO(2) nanoparticles in aqueous suspension was investigated. Two approaches to minimize the agglomeration of colloidal TiO(2) particles were investigated. A careful control over the pH of the system was found to be an effective method for stabilizing colloidal TiO(2) particles and to significantly enhance the adsorption of orange II. As a result, the overall photocatalytic degradation rate was greatly accelerated. In addition to pH control, modification of TiO(2) particles using polyelectrolyte poly allylamine hydrochloride (PAH) was observed to be an effective approach for preventing colloidal TiO(2) particles from agglomeration.
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Affiliation(s)
- Gang Li
- Department of Chemical and Biomolecular Engineering, National University of Singapore, 4 Engineering Drive 4, 117576, Singapore
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Gopalan RC, Osman IF, Amani A, De Matas M, Anderson D. The effect of zinc oxide and titanium dioxide nanoparticles in the Comet assay with UVA photoactivation of human sperm and lymphocytes. Nanotoxicology 2009. [DOI: 10.1080/17435390802596456] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Affiliation(s)
| | | | - Amir Amani
- Institute of Pharmaceutical Innovation, Bradford, UK
- Department of Nanomedicine, Tehran University of Medical Sciences, Tehran, Iran
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French RA, Jacobson AR, Kim B, Isley SL, Penn RL, Baveye PC. Influence of ionic strength, pH, and cation valence on aggregation kinetics of titanium dioxide nanoparticles. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2009; 43:1354-9. [PMID: 19350903 DOI: 10.1021/es802628n] [Citation(s) in RCA: 464] [Impact Index Per Article: 30.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
The extensive use of titanium dioxide nanoparticles (nano-TiO2) in many consumer products has raised concerns about possible risks to the environment The magnitude of the threat may depend on whether nano-TiO2 remains dispersed in the environment, or forms much larger-sized aggregates or clusters. Currently, limited information is available on the issue. In this context, the purpose of the present article is to report initial measurements of the morphology and rate of formation of nano-TiO2 aggregates in aqueous suspensions as a function of ionic strength and of the nature of the electrolyte in a moderately acid to circumneutral pH range typical of soil and surface water conditions. Dynamic light scattering results show that 4-5 nm titanium dioxide particles readily form stable aggregates with an average diameter of 50-60 nm at pH approximately 4.5 in a NaCl suspension adjusted to an ionic strength of 0.0045 M. Holding the pH constant but increasing the ionic strength to 0.0165 M, leads to the formation of micron-sized aggregates within 15 min. At all other pH values tested (5.8-8.2), micron-sized aggregates form in less than 5 min (minimum detection time), even at low ionic strength (0.0084-0.0099 M with NaCl). In contrast, micron-sized aggregates form within 5 min in an aqueous suspension of CaCl2 at an ionic strength of 0.0128 M and pH of 4.8, which is significantly faster than observed for NaCI suspensions with similar ionic strength and pH. This result indicates that divalent cations may enhance aggregation of nano-TiO2 in soils and surface waters. Optical micrographs show branching aggregates of sizes ranging from the 1 microm optical limit of the microscope to tens of micrometers in diameter.
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Affiliation(s)
- Rebecca A French
- Center for NanoBioEarth, Department of Geosciences, Virginia Tech, 4044 Derring Hall, Blacksburg, Virginia 24061, USA
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Aruoja V, Dubourguier HC, Kasemets K, Kahru A. Toxicity of nanoparticles of CuO, ZnO and TiO2 to microalgae Pseudokirchneriella subcapitata. THE SCIENCE OF THE TOTAL ENVIRONMENT 2009; 407:1461-8. [PMID: 19038417 DOI: 10.1016/j.scitotenv.2008.10.053] [Citation(s) in RCA: 710] [Impact Index Per Article: 47.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/14/2008] [Revised: 10/18/2008] [Accepted: 10/23/2008] [Indexed: 05/20/2023]
Abstract
Toxicities of ZnO, TiO2 and CuO nanoparticles to Pseudokirchneriella subcapitata were determined using OECD 201 algal growth inhibition test taking in account potential shading of light. The results showed that the shading effect by nanoparticles was negligible. ZnO nanoparticles were most toxic followed by nano CuO and nano TiO2. The toxicities of bulk and nano ZnO particles were both similar to that of ZnSO4 (72 h EC50 approximately 0.04 mg Zn/l). Thus, in this low concentration range the toxicity was attributed solely to solubilized Zn2+ ions. Bulk TiO2 (EC50=35.9 mg Ti/l) and bulk CuO (EC50=11.55 mg Cu/l) were less toxic than their nano formulations (EC50=5.83 mg Ti/l and 0.71 mg Cu/l). NOEC (no-observed-effect-concentrations) that may be used for risk assessment purposes for bulk and nano ZnO did not differ (approximately 0.02 mg Zn/l). NOEC for nano CuO was 0.42 mg Cu/l and for bulk CuO 8.03 mg Cu/l. For nano TiO2 the NOEC was 0.98 mg Ti/l and for bulk TiO2 10.1 mg Ti/l. Nano TiO2 formed characteristic aggregates entrapping algal cells that may contribute to the toxic effect of nano TiO2 to algae. At 72 h EC50 values of nano CuO and CuO, 25% of copper from nano CuO was bioavailable and only 0.18% of copper from bulk CuO. Thus, according to recombinant bacterial and yeast Cu-sensors, copper from nano CuO was 141-fold more bioavailable than from bulk CuO. Also, toxic effects of Cu oxides to algae were due to bioavailable copper ions. To our knowledge, this is one of the first systematic studies on effects of metal oxide nanoparticles on algal growth and the first describing toxic effects of nano CuO towards algae.
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Affiliation(s)
- Villem Aruoja
- Laboratory of Molecular Genetics, National Institute of Chemical Physics and Biophysics, Akadeemia tee 23, Tallinn 12618, Estonia
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Kahru A, Dubourguier HC, Blinova I, Ivask A, Kasemets K. Biotests and Biosensors for Ecotoxicology of Metal Oxide Nanoparticles: A Minireview. SENSORS 2008; 8:5153-5170. [PMID: 27873807 PMCID: PMC3705494 DOI: 10.3390/s8085153] [Citation(s) in RCA: 119] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/10/2008] [Revised: 08/25/2008] [Accepted: 08/26/2008] [Indexed: 12/14/2022]
Abstract
Nanotechnologies have become a significant priority worldwide. Several manufactured nanoparticles - particles with one dimension less than 100 nm - are increasingly used in consumer products. At nanosize range, the properties of materials differ substantially from bulk materials of the same composition, mostly due to the increased specific surface area and reactivity, which may lead to increased bioavailability and toxicity. Thus, for the assessment of sustainability of nanotechnologies, hazards of manufactured nanoparticles have to be studied. Despite all the above mentioned, the data on the potential environmental effects of nanoparticles are rare. This mini-review is summarizing the emerging information on different aspects of ecotoxicological hazard of metal oxide nanoparticles, focusing on TiO2, ZnO and CuO. Various biotests that have been successfully used for evaluation of ecotoxic properties of pollutants to invertebrates, algae and bacteria and now increasingly applied for evaluation of hazard of nanoparticles at different levels of the aquatic food-web are discussed. Knowing the benefits and potential drawbacks of these systems, a suite of tests for evaluation of environmental hazard of nanoparticles is proposed. Special attention is paid to the influence of particle solubility and to recombinant metal-sensing bacteria as powerful tools for quantification of metal bioavailability. Using recombinant metal-specific bacterial biosensors and multitrophic ecotoxicity assays in tandem will create new scientific knowledge on the respective role of ionic species and of particles in toxicity of metal oxide nanoparticles.
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Affiliation(s)
- Anne Kahru
- Laboratory of Molecular Genetics, National Institute of Chemical Physics and Biophysics, Akadeemia tee 23, Tallinn 12618, Estonia.
| | - Henri-Charles Dubourguier
- Laboratory of Molecular Genetics, National Institute of Chemical Physics and Biophysics, Akadeemia tee 23, Tallinn 12618, Estonia
- Estonian University of Life Sciences, Kreutzwaldi 5, Tartu 51014, Estonia
| | - Irina Blinova
- Laboratory of Molecular Genetics, National Institute of Chemical Physics and Biophysics, Akadeemia tee 23, Tallinn 12618, Estonia
| | - Angela Ivask
- Laboratory of Molecular Genetics, National Institute of Chemical Physics and Biophysics, Akadeemia tee 23, Tallinn 12618, Estonia
| | - Kaja Kasemets
- Laboratory of Molecular Genetics, National Institute of Chemical Physics and Biophysics, Akadeemia tee 23, Tallinn 12618, Estonia
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