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Ibrahim FM, El-Liethy MA, Abouzeid R, Youssef AM, Mahdy SZA, El Habbasha ES. Preparation and characterization of pectin/hydroxyethyl cellulose/clay/TiO 2 bionanocomposite films for microbial pathogen removal from contaminated water. Int J Biol Macromol 2024; 274:133511. [PMID: 38944095 DOI: 10.1016/j.ijbiomac.2024.133511] [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: 03/13/2024] [Revised: 06/13/2024] [Accepted: 06/26/2024] [Indexed: 07/01/2024]
Abstract
Some of conventional wastewater disinfectants can have a harmful influence on the environment as well as human health. The aim of this investigation was synthesis and characterizes ecofriendly pectin/hydroxyethyl cellulose (HEC)/clay and pectin/HEC/clay incorporated with titanium dioxide nanoparticles (TiO2NPs) and use the prepared bionanocomposite as microbial disinfectants for real wastewater. Pectin/HEC/clay and pectin/HEC/clay/TiO2 bionanocomposite were characterized by various methods including X-ray diffraction (XRD), scanning electron microscope (SEM), and Fourier-transform infrared spectroscopy (FTIR), thermal gravimetric analysis (TGA). Mechanical properties and water vapor permeability (WVP) were carried out. The results of SEM showed that, the prepared bionanocomposite had a smooth surface. Additionally, TiO2 nanoparticles to the pectin/HEC/clay composites may lead to changes in the FTIR spectrum. The intensity of XRD peaks indicated that, TiO2NPs was small size crystallite. TGA illustrated that pectin has moderate thermal stability, while HEC generally exhibits good thermal stability. The TEM showed that, TiO2 nanoparticles have diameters <25 nm. On the other hand, antimicrobial activities of pectin/HEC/clay against Escherichia coli (E. coli), Staphylococcus aureus and Candida albicans have been enhanced by adding TiO2NPs. The minimum inhibitory concentration (MIC) of pectin/HEC/clay/TiO2 against E. coli was 200 mg/mL. Moreover, complete eradication of E. coli, Salmonella and Candida spp. from real wastewater was observed by using pectin/HEC/clay/TiO2 bionanocomposite. Finally, it can be concluded that, the synthesized bionanocomposite is environmentally friendly and considered an excellent disinfectant matter for removal of the microbial pathogens from wastewater to safely reuse.
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Affiliation(s)
- Faten Mohamed Ibrahim
- Medicinal and Aromatic Plants Research Department, Pharmaceutical and Drug Industries Research Institute, National Research Centre, P.O. Box 12622, Cairo, Egypt
| | - Mohamed Azab El-Liethy
- Environmental Microbiology Lab., Water Pollution Research Department, National Research Centre, Dokki, 12622 Giza, Egypt.
| | - Ragab Abouzeid
- Cellulose and Paper Department, National Research Centre, P.O. 12622, Dokki, Giza, Egypt
| | - Ahmed M Youssef
- Packaging Materials Department, National Research Centre, 33 El Bohouth St. (former El Tahrir St.), P.O. 12622, Dokki, Giza, Egypt
| | - Sara Z A Mahdy
- Chemistry Department, Faculty of Science, Benha University, Cairo, Egypt
| | - El Sayed El Habbasha
- Field crops Research Department, National Research Centre, P.O. 12622, Dokki, Giza, Egypt
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Pugazhendhi AS, Neal CJ, Ta KM, Molinari M, Kumar U, Wei F, Kolanthai E, Ady A, Drake C, Hughes M, Yooseph S, Seal S, Coathup MJ. A neoteric antibacterial ceria-silver nanozyme for abiotic surfaces. Biomaterials 2024; 307:122527. [PMID: 38518591 DOI: 10.1016/j.biomaterials.2024.122527] [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: 01/16/2024] [Revised: 03/01/2024] [Accepted: 03/08/2024] [Indexed: 03/24/2024]
Abstract
Community-associated and hospital-acquired infections caused by bacteria continue to yield major global challenges to human health. Bacterial contamination on abiotic surfaces is largely spread via high-touch surfaces and contemporary standard disinfection practices show limited efficacy, resulting in unsatisfactory therapeutic outcomes. New strategies that offer non-specific and broad protection are urgently needed. Herein, we report our novel ceria-silver nanozyme engineered at a molar ratio of 5:1 and with a higher trivalent (Ce3+) surface fraction. Our results reveal potent levels of surface catalytic activity on both wet and dry surfaces, with rapid, and complete eradication of Pseudomonas aeruginosa, Staphylococcus aureus, and methicillin resistant S. aureus, in both planktonic and biofilm form. Preferential electrostatic adherence of anionic bacteria to the cationic nanozyme surface leads to a catastrophic loss in both aerobic and anaerobic respiration, DNA damage, osmodysregulation, and finally, programmed bacterial lysis. Our data reveal several unique mechanistic avenues of synergistic ceria-Ag efficacy. Ag potentially increases the presence of Ce3+ sites at the ceria-Ag interface, thereby facilitating the formation of harmful H2O2, followed by likely permeation across the cell wall. Further, a weakened Ag-induced Ce-O bond may drive electron transfer from the Ec band to O2, thereby further facilitating the selective reduction of O2 toward H2O2 formation. Ag destabilizes the surface adsorption of molecular H2O2, potentially leading to higher concentrations of free H2O2 adjacent to bacteria. To this end, our results show that H2O2 and/or NO/NO2-/NO3- are the key liberators of antibacterial activity, with a limited immediate role being offered by nanozyme-induced ROS including O2•- and OH•, and likely other light-activated radicals. A mini-pilot proof-of-concept study performed in a pediatric dental clinic setting confirms residual, and continual nanozyme antibacterial efficacy over a 28-day period. These findings open a new approach to alleviate infections caused by bacteria for use on high-touch hard surfaces.
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Affiliation(s)
- Abinaya Sindu Pugazhendhi
- Biionix Cluster, College of Medicine, University of Central Florida, Orlando, FL, 32827, United States
| | - Craig J Neal
- Advanced Materials Processing and Analysis Centre, Nanoscience Technology Center (NSTC), University of Central Florida, Orlando, FL, 32826, United States
| | - Khoa Minh Ta
- Department of Chemical Sciences, School of Applied Sciences, University of Huddersfield, Huddersfield, HD1 3DH, United Kingdom
| | - Marco Molinari
- Department of Chemical Sciences, School of Applied Sciences, University of Huddersfield, Huddersfield, HD1 3DH, United Kingdom.
| | - Udit Kumar
- Advanced Materials Processing and Analysis Centre, Nanoscience Technology Center (NSTC), University of Central Florida, Orlando, FL, 32826, United States
| | - Fei Wei
- Biionix Cluster, College of Medicine, University of Central Florida, Orlando, FL, 32827, United States
| | - Elayaraja Kolanthai
- Advanced Materials Processing and Analysis Centre, Nanoscience Technology Center (NSTC), University of Central Florida, Orlando, FL, 32826, United States
| | - Andrew Ady
- Biionix Cluster, College of Medicine, University of Central Florida, Orlando, FL, 32827, United States
| | - Christina Drake
- Kismet Technologies, 7101 TPC Drive, Suite 130, Orlando, FL, 32822, United States
| | - Megan Hughes
- University of Cardiff, Cardiff, CF10 3AT, Wales, United Kingdom
| | - Shibu Yooseph
- Kravis Department of Integrated Sciences, Claremont McKenna College, Claremont, CA 91711, United States
| | - Sudipta Seal
- Biionix Cluster, College of Medicine, University of Central Florida, Orlando, FL, 32827, United States; Advanced Materials Processing and Analysis Centre, Nanoscience Technology Center (NSTC), University of Central Florida, Orlando, FL, 32826, United States
| | - Melanie J Coathup
- Biionix Cluster, College of Medicine, University of Central Florida, Orlando, FL, 32827, United States.
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3
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Fu Z, Fan K, He X, Wang Q, Yuan J, Lim KS, Tang JN, Xie F, Cui X. Single-Atom-Based Nanoenzyme in Tissue Repair. ACS NANO 2024; 18:12639-12671. [PMID: 38718193 DOI: 10.1021/acsnano.4c00308] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2024]
Abstract
Since the discovery of ferromagnetic nanoparticles Fe3O4 that exhibit enzyme-like activity in 2007, the research on nanoenzymes has made significant progress. With the in-depth study of various nanoenzymes and the rapid development of related nanotechnology, nanoenzymes have emerged as a promising alternative to natural enzymes. Within nanozymes, there is a category of metal-based single-atom nanozymes that has been rapidly developed due to low cast, convenient preparation, long storage, less immunogenicity, and especially higher efficiency. More importantly, single-atom nanozymes possess the capacity to scavenge reactive oxygen species through various mechanisms, which is beneficial in the tissue repair process. Herein, this paper systemically highlights the types of metal single-atom nanozymes, their catalytic mechanisms, and their recent applications in tissue repair. The existing challenges are identified and the prospects of future research on nanozymes composed of metallic nanomaterials are proposed. We hope this review will illuminate the potential of single-atom nanozymes in tissue repair, encouraging their sequential clinical translation.
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Affiliation(s)
- Ziliang Fu
- Cardiac and Osteochondral Tissue Engineering (COTE) Group, School of Medicine, The Chinese University of Hong Kong, Shenzhen, Guangdong 518172, China
- Ciechanover Institute of Precision and Regenerative Medicine, School of Medicine, The Chinese University of Hong Kong, Shenzhen 518172, China
| | - Kexin Fan
- Cardiac and Osteochondral Tissue Engineering (COTE) Group, School of Medicine, The Chinese University of Hong Kong, Shenzhen, Guangdong 518172, China
- Ciechanover Institute of Precision and Regenerative Medicine, School of Medicine, The Chinese University of Hong Kong, Shenzhen 518172, China
| | - Xingjian He
- Cardiac and Osteochondral Tissue Engineering (COTE) Group, School of Medicine, The Chinese University of Hong Kong, Shenzhen, Guangdong 518172, China
- Ciechanover Institute of Precision and Regenerative Medicine, School of Medicine, The Chinese University of Hong Kong, Shenzhen 518172, China
| | - Qiguang Wang
- National Engineering Research Center for Biomaterials, Sichuan University, Chengdu, Sichuan 610065, China
| | - Jie Yuan
- Department of Cardiology, Shenzhen People's Hospital, Shenzhen, Guangdong 518001, China
| | - Khoon S Lim
- School of Medical Sciences, University of Sydney, NSW 2006, Australia
| | - Jun-Nan Tang
- Department of Cardiology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan 450052, China
- Henan Province Key Laboratory of Cardiac Injury and Repair, Zhengzhou, Henan 450052, China
- Henan Province Clinical Research Center for Cardiovascular Diseases, Zhengzhou, Henan 450052, China
| | - Fangxi Xie
- School of Chemical Engineering and Technology, Sun Yat-Sen University, Zhuhai, Guangdong 519082, China
| | - Xiaolin Cui
- Cardiac and Osteochondral Tissue Engineering (COTE) Group, School of Medicine, The Chinese University of Hong Kong, Shenzhen, Guangdong 518172, China
- Ciechanover Institute of Precision and Regenerative Medicine, School of Medicine, The Chinese University of Hong Kong, Shenzhen 518172, China
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Rokicka-Konieczna P, Morawski AW. Photocatalytic Bacterial Destruction and Mineralization by TiO 2-Based Photocatalysts: A Mini Review. Molecules 2024; 29:2221. [PMID: 38792082 PMCID: PMC11123885 DOI: 10.3390/molecules29102221] [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: 04/18/2024] [Revised: 05/07/2024] [Accepted: 05/07/2024] [Indexed: 05/26/2024] Open
Abstract
This work presents an overview of the reports on the bacterial cell photocatalytic destruction and mineralization process in the presence of TiO2-based photocatalysts. The presented research included experiments conducted in air and water. Numerous works confirmed that a photocatalytic process with TiO2 led to bacteria and their organic residues' mineralization. Additionally, based on the obtained results, a possible two-stage mechanism of photocatalytic mineralization in the presence of TiO2-based materials was proposed. To help future studies, challenges of photocatalytic microorganism mineralization are also proposed. There are some aspects that need to be addressed, such as the lack of standardization of conducted research or relatively small amount of research on photocatalytic microorganism mineralization. According to our best knowledge, in the available literature, no work regarding a summary of previous research on photocatalytic bacterial mineralization process was found.
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Affiliation(s)
- Paulina Rokicka-Konieczna
- Department of Inorganic Chemical Technology and Environment Engineering, Faculty of Chemical Technology and Engineering, West Pomeranian University of Technology in Szczecin, Pułaskiego 10, 70-322 Szczecin, Poland;
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5
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Summer M, Ali S, Tahir HM, Abaidullah R, Fiaz U, Mumtaz S, Fiaz H, Hassan A, Mughal TA, Farooq MA. Mode of Action of Biogenic Silver, Zinc, Copper, Titanium and Cobalt Nanoparticles Against Antibiotics Resistant Pathogens. J Inorg Organomet Polym Mater 2024; 34:1417-1451. [DOI: 10.1007/s10904-023-02935-y] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2023] [Accepted: 11/02/2023] [Indexed: 08/04/2024]
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6
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Anyaegbunam NJ, Mba IE, Ige AO, Ogunrinola TE, Emenike OK, Uwazie CK, Ujah PN, Oni AJ, Anyaegbunam ZKG, Olawade DB. Revisiting the smart metallic nanomaterials: advances in nanotechnology-based antimicrobials. World J Microbiol Biotechnol 2024; 40:102. [PMID: 38366174 DOI: 10.1007/s11274-024-03925-z] [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: 01/03/2024] [Accepted: 02/08/2024] [Indexed: 02/18/2024]
Abstract
Despite significant advancements in diagnostics and treatments over the years, the problem of antimicrobial drug resistance remains a pressing issue in public health. The reduced effectiveness of existing antimicrobial drugs has prompted efforts to seek alternative treatments for microbial pathogens or develop new drug candidates. Interestingly, nanomaterials are currently gaining global attention as a possible next-generation antibiotics. Nanotechnology holds significant importance, particularly when addressing infections caused by multi-drug-resistant organisms. Alternatively, these biomaterials can also be combined with antibiotics and other potent biomaterials, providing excellent synergistic effects. Over the past two decades, nanoparticles have gained significant attention among research communities. Despite the complexity of some of their synthesis strategies and chemistry, unrelenting efforts have been recorded in synthesizing potent and highly effective nanomaterials using different approaches. With the ongoing advancements in nanotechnology, integrating it into medical procedures presents novel approaches for improving the standard of patient healthcare. Although the field of nanotechnology offers promises, much remains to be learned to overcome the several inherent issues limiting their full translation to clinics. Here, we comprehensively discussed nanotechnology-based materials, focusing exclusively on metallic nanomaterials and highlighting the advances in their synthesis, chemistry, and mechanisms of action against bacterial pathogens. Importantly, we delve into the current challenges and prospects associated with the technology.
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Affiliation(s)
- Ngozi J Anyaegbunam
- Measurement and Evaluation unit, Science Education Department, University of Nigeria, Nsukka, Nigeria
| | - Ifeanyi Elibe Mba
- Department of Microbiology, Faculty of Biological Sciences, University of Nigeria Nsukka, Nsukka, Nigeria.
| | - Abimbola Olufunke Ige
- Department of Pharmaceutical Microbiology, Faculty of Pharmacy, University of Ibadan, Ibadan, Nigeria
| | | | | | | | - Patrick Ndum Ujah
- 7Department of Education Foundations, University of Nigeria Nsukka, Nsukka, Nigeria
| | - Ayodele John Oni
- Department of Industrial chemistry, Federal University of Technology, Akure, Nigeria
| | | | - David B Olawade
- Department of Allied and Public Health, School of Health, Sport and Bioscience, University of East London, London, UK
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7
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Chatterjee P, Chauhan N, Jain U. Confronting antibiotic-resistant pathogens: Distinctive drug delivery potentials of progressive nanoparticles. Microb Pathog 2024; 187:106499. [PMID: 38097117 DOI: 10.1016/j.micpath.2023.106499] [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: 09/26/2023] [Revised: 11/07/2023] [Accepted: 12/08/2023] [Indexed: 01/07/2024]
Abstract
Antimicrobial resistance arises over time, usually due to genetic modifications. Global observations of high resistance rates to popular antibiotics used to treat common bacterial diseases, such as diarrhea, STIs, sepsis, and urinary tract infections, indicate that our supply of effective antibiotics is running low. The mechanisms of action of several antibiotic groups are covered in this review. Antimicrobials disrupt the development and metabolism of bacteria, leading to their eventual death. However, in recent years, microorganisms become resistant to the drugs. Bacteria encode resistant genes against antibiotics and inhibit the function of antibiotics by reducing the uptake of drugs, modifying the enzyme's active site, synthesizing enzymes to degrade antibiotics, and changing the structure of ribosomal subunits. Additionally, the methods of action of resistant bacteria against different kinds of antibiotics as well as their modes of action are discussed. Besides, the resistant pathogenic bacteria which get the most priority by World Health Organisation (WHO) for synthesizing new drugs, have also been incorporated. To overcome antimicrobial resistance, nanomaterials are used to increase the efficacy of antimicrobial drugs. Metallic, inorganic, and polymer-based nanoparticles once conjugated with antibacterial drugs, exhibit synergistic effects by increasing the efficacy of the drugs by inhibiting bacterial growth. Nanomaterial's toxic properties are proportional to their concentrations. Higher concentration nanomaterials are more toxic to the cells. In this review, the toxic properties of nanomaterials on lung cells, lymph nodes, and neuronal cells are also summarized.
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Affiliation(s)
- Pallabi Chatterjee
- School of Health Sciences & Technology (SoHST), University of Petroleum and Energy Studies (UPES), Bidholi, 248007, Dehradun, India
| | - Nidhi Chauhan
- School of Health Sciences & Technology (SoHST), University of Petroleum and Energy Studies (UPES), Bidholi, 248007, Dehradun, India
| | - Utkarsh Jain
- School of Health Sciences & Technology (SoHST), University of Petroleum and Energy Studies (UPES), Bidholi, 248007, Dehradun, India.
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8
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Rathore C, Yadav VK, Gacem A, AbdelRahim SK, Verma RK, Chundawat RS, Gnanamoorthy G, Yadav KK, Choudhary N, Sahoo DK, Patel A. Microbial synthesis of titanium dioxide nanoparticles and their importance in wastewater treatment and antimicrobial activities: a review. Front Microbiol 2023; 14:1270245. [PMID: 37908543 PMCID: PMC10613736 DOI: 10.3389/fmicb.2023.1270245] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2023] [Accepted: 09/20/2023] [Indexed: 11/02/2023] Open
Abstract
Nanotechnology (NT) and nanoparticles (NPs) have left a huge impact on every field of science today, but they have shown tremendous importance in the fields of cosmetics and environmental cleanup. NPs with photocatalytic effects have shown positive responses in wastewater treatment, cosmetics, and the biomedical field. The chemically synthesized TiO2 nanoparticles (TiO2 NPs) utilize hazardous chemicals to obtain the desired-shaped TiO2. So, microbial-based synthesis of TiO2 NPs has gained popularity due to its eco-friendly nature, biocompatibility, etc. Being NPs, TiO2 NPs have a high surface area-to-volume ratio in addition to their photocatalytic degradation nature. In the present review, the authors have emphasized the microbial (algae, bacterial, fungi, and virus-mediated) synthesis of TiO2 NPs. Furthermore, authors have exhibited the importance of TiO2 NPs in the food sector, automobile, aerospace, medical, and environmental cleanup.
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Affiliation(s)
- Chandani Rathore
- Department of Biosciences, School of Liberal Arts and Sciences, Mody University of Science and Technology, Laxmangarh, Rajasthan, India
| | - Virendra Kumar Yadav
- Department of Life Sciences, Hemchandracharya North Gujarat University, Patan, Gujarat, India
| | - Amel Gacem
- Department of Physics, Faculty of Sciences, University 20 Août 1955, Skikda, Algeria
| | - Siham K. AbdelRahim
- Department of Chemistry, College of Science, King Khalid University, Abha, Saudi Arabia
| | - Rakesh Kumar Verma
- Department of Biosciences, School of Liberal Arts and Sciences, Mody University of Science and Technology, Laxmangarh, Rajasthan, India
| | - Rajendra Singh Chundawat
- Department of Biosciences, School of Liberal Arts and Sciences, Mody University of Science and Technology, Laxmangarh, Rajasthan, India
| | - G. Gnanamoorthy
- Department of Inorganic Chemistry, University of Madras, Chennai, Tamilnadu, India
| | - Krishna Kumar Yadav
- Faculty of Science and Technology, Madhyanchal Professional University, Ratibad, Bhopal, India
- Environmental and Atmospheric Sciences Research Group, Scientific Research Center, Al-Ayen University, Nasiriyah, Iraq
| | - Nisha Choudhary
- Department of Life Sciences, Hemchandracharya North Gujarat University, Patan, Gujarat, India
| | - Dipak Kumar Sahoo
- Department of Veterinary Clinical Sciences, College of Veterinary Medicine, Iowa State University, Ames, IA, United States
| | - Ashish Patel
- Department of Life Sciences, Hemchandracharya North Gujarat University, Patan, Gujarat, India
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9
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Ma Y, Yu N, Lu H, Shi J, Zhang Y, Chen Z, Jia G. Titanium dioxide nanoparticles: revealing the mechanisms underlying hepatotoxicity and effects in the gut microbiota. Arch Toxicol 2023; 97:2051-2067. [PMID: 37344693 DOI: 10.1007/s00204-023-03536-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2023] [Accepted: 06/06/2023] [Indexed: 06/23/2023]
Abstract
Numerous studies in recent years have questioned the safety of oral exposure to titanium dioxide nanoparticles (TiO2 NPs). TiO2 NPs are not only likely to accumulate in the gastrointestinal tract, but they are also found to penetrate the body circulation and reach distant organs. The liver, which is considered to be a target organ for nanoparticles, is of particular concern. TiO2 NPs accumulate in the liver and cause oxidative stress and inflammatory reactions, resulting in pathological damage. The impact of TiO2 NPs on liver aspartate aminotransferase (AST) and alanine aminotransferase (ALT) was studied using a meta-analysis. According to the findings, TiO2 NPs exposure can cause an elevation in AST and ALT levels in the blood. Furthermore, TiO2 NPs are eliminated mostly through feces, and their lengthy residence in the gut exposes them to microbiota. The gut microbiota is also dysbiotic due to titanium dioxide's antibacterial capabilities. This further leads to changes in the amount of microbiota metabolites, which can reach the liver with blood circulation and trigger hepatotoxicity through the gut-liver axis. This review examines the gut-liver axis to assess the effects of gut microbiota dysbiosis on the liver to provide suggestions for assessing the gut-hepatotoxicity of TiO2 NPs.
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Affiliation(s)
- Ying Ma
- Department of Occupational and Environmental Health Sciences, School of Public Health, Peking University, Beijing, 100191, People's Republic of China
- Beijing Key Laboratory of Toxicological Research and Risk Assessment for Food Safety, School of Public Health, Peking University, Beijing, 100191, People's Republic of China
| | - Nairui Yu
- Department of Occupational and Environmental Health Sciences, School of Public Health, Peking University, Beijing, 100191, People's Republic of China
- Beijing Key Laboratory of Toxicological Research and Risk Assessment for Food Safety, School of Public Health, Peking University, Beijing, 100191, People's Republic of China
| | - Huaye Lu
- Jiangsu Prov Ctr Dis Control and Prevent, 172 Jiangsu Rd, Nanjing, 210009, People's Republic of China
| | - Jiaqi Shi
- Department of Occupational and Environmental Health Sciences, School of Public Health, Peking University, Beijing, 100191, People's Republic of China
- Beijing Key Laboratory of Toxicological Research and Risk Assessment for Food Safety, School of Public Health, Peking University, Beijing, 100191, People's Republic of China
| | - Yi Zhang
- Department of Occupational and Environmental Health Sciences, School of Public Health, Peking University, Beijing, 100191, People's Republic of China
- Beijing Key Laboratory of Toxicological Research and Risk Assessment for Food Safety, School of Public Health, Peking University, Beijing, 100191, People's Republic of China
| | - Zhangjian Chen
- Department of Occupational and Environmental Health Sciences, School of Public Health, Peking University, Beijing, 100191, People's Republic of China.
- Beijing Key Laboratory of Toxicological Research and Risk Assessment for Food Safety, School of Public Health, Peking University, Beijing, 100191, People's Republic of China.
| | - Guang Jia
- Department of Occupational and Environmental Health Sciences, School of Public Health, Peking University, Beijing, 100191, People's Republic of China
- Beijing Key Laboratory of Toxicological Research and Risk Assessment for Food Safety, School of Public Health, Peking University, Beijing, 100191, People's Republic of China
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10
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Tang X, Li Y, Li Q, Yu J, Bai H. The role of electrostatic potential in the translocation of triangulene across membranes. RSC Adv 2023; 13:21545-21549. [PMID: 37469968 PMCID: PMC10352715 DOI: 10.1039/d3ra03259k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2023] [Accepted: 06/30/2023] [Indexed: 07/21/2023] Open
Abstract
Triangulene and its derivatives show broad application prospects in the fields of biological imaging and biosensing. However, its interaction with cell membranes is still poorly studied. In this study, classical molecular dynamics simulations were used to adjust the electrostatic potential of triangulene to observe its interactions with cell membranes. We found that electrostatic potential not only affects the behavior as it enters the cell membrane, but also spatial distribution within the cell membrane. The angle distribution of inside-0 and all-0 triangulene when penetrating the membrane is more extensive than that of ESP triangulene. However, inside-0 triangulene could cross the midline of the cell membrane and prefers to stay in the upper leaflet, while all-0 triangulene and ESP triangulene can reach the lower leaflet. These findings can help us regulate the distribution of nanoparticles in cells, so as to design functional nanoparticles that conform to the requirements.
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Affiliation(s)
- Xiaofeng Tang
- Yunnan Cancer Hospital, The Third Affiliated Hospital of Kunming Medical University Kunming People's Republic of China
| | - Youyun Li
- The Second Affiliated Hospital of Kunming Medical University Kunming People's Republic of China
| | - Qianyan Li
- Yunnan Cancer Hospital, The Third Affiliated Hospital of Kunming Medical University Kunming People's Republic of China
| | - Jinhui Yu
- Yunnan Cancer Hospital, The Third Affiliated Hospital of Kunming Medical University Kunming People's Republic of China
| | - Han Bai
- Yunnan Cancer Hospital, The Third Affiliated Hospital of Kunming Medical University Kunming People's Republic of China
- School of Physics and Astronomy, Yunnan University Kunming People's Republic of China
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11
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Bietto F, Scardaci R, Brovia M, Kokalari I, Barbero F, Fenoglio I, Pessione E. Food-grade titanium dioxide can affect microbiota physiology, adhesion capability, and interbacterial interactions: A study onL. rhamnosus and E. faecium. Food Chem Toxicol 2023; 176:113760. [PMID: 37028743 DOI: 10.1016/j.fct.2023.113760] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2022] [Revised: 03/25/2023] [Accepted: 03/30/2023] [Indexed: 04/08/2023]
Abstract
Food-grade titanium dioxide (TiO2-FG) is a widespread metal oxide used in the food industries. Recently, the European Food Safety Authority concluded that TiO2-FG cannot be considered safe for consumption due to its genotoxicity; however, its effect on the gut microbiota has not yet been completely unraveled. We studied the effects of TiO2-FG (0.125 mg/mL) on Lactobacillus rhamnosus GG (LGG) and Enterococcus faecium NCIMB10415 (Ent), in particular some physiological and phenotypic traits (growth kinetics, bile salts, and ampicillin resistance) and their interactions with the host (auto-aggregation, biofilm formation, and adhesion on Caco-2/TC7 monolayers) and other gut microorganisms (antimicrobial activity towards pathogens). The results obtained revealed that TiO2-FG alters both LGG and Ent growth and lowers bile resistance (62 and 34.5%, respectively) and adhesion on Caco-2/TC7 monolayers (34.8 and 14.16%, respectively). The other outcomes were strictly species-specific: Ent showed a lower ampicillin sensitivity (14.48%) and auto-aggregation (38.1%), while LGG showed a reduced biofilm formation (37%) and antimicrobial activity towards Staphylococcus aureus (35.73%). Overall, these results suggest an adverse effect of TiO2-FG on both the endogenous and exogenously administered probiotics, contributing to the argument against using TiO2-FG as a food additive.
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Affiliation(s)
- F Bietto
- Laboratory of Microbial Biochemistry and Proteomics, Department of Life Sciences and Systems Biology, University of Turin, Via Accademia Albertina 13, 10123, Torino, Italy.
| | - R Scardaci
- Laboratory of Microbial Biochemistry and Proteomics, Department of Life Sciences and Systems Biology, University of Turin, Via Accademia Albertina 13, 10123, Torino, Italy.
| | - M Brovia
- Laboratory of Microbial Biochemistry and Proteomics, Department of Life Sciences and Systems Biology, University of Turin, Via Accademia Albertina 13, 10123, Torino, Italy.
| | - I Kokalari
- Department of Chemistry, University of Turin, via P. Giuria 7, 10125, Torino, Italy.
| | - F Barbero
- Department of Chemistry, University of Turin, via P. Giuria 7, 10125, Torino, Italy.
| | - I Fenoglio
- Department of Chemistry, University of Turin, via P. Giuria 7, 10125, Torino, Italy.
| | - E Pessione
- Laboratory of Microbial Biochemistry and Proteomics, Department of Life Sciences and Systems Biology, University of Turin, Via Accademia Albertina 13, 10123, Torino, Italy.
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12
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Palanisamy G, Thangarasu S, Oh TH. Effect of Sulfonated Inorganic Additives Incorporated Hybrid Composite Polymer Membranes on Enhancing the Performance of Microbial Fuel Cells. Polymers (Basel) 2023; 15:polym15051294. [PMID: 36904534 PMCID: PMC10006918 DOI: 10.3390/polym15051294] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2023] [Revised: 02/27/2023] [Accepted: 02/28/2023] [Indexed: 03/08/2023] Open
Abstract
Microbial fuel cells (MFCs) provide considerable benefits in the energy and environmental sectors for producing bioenergy during bioremediation. Recently, new hybrid composite membranes with inorganic additives have been considered for MFC application to replace the high cost of commercial membranes and improve the performances of cost-effective polymers, such as MFC membranes. The homogeneous impregnation of inorganic additives in the polymer matrix effectively enhances the physicochemical, thermal, and mechanical stabilities and prevents the crossover of substrate and oxygen through polymer membranes. However, the typical incorporation of inorganic additives in the membrane decreases the proton conductivity and ion exchange capacity. In this critical review, we systematically explained the impact of sulfonated inorganic additives (such as (sulfonated) sSiO2, sTiO2, sFe3O4, and s-graphene oxide) on different kinds of hybrid polymers (such as PFSA, PVDF, SPEEK, SPAEK, SSEBS, and PBI) membrane for MFC applications. The membrane mechanism and interaction between the polymers and sulfonated inorganic additives are explained. The impact of sulfonated inorganic additives on polymer membranes is highlighted based on the physicochemical, mechanical, and MFC performances. The core understandings in this review can provide vital direction for future development.
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13
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Lesniewska N, Beaussart A, Duval JF. Electrostatics of soft (bio)interfaces: Corrections of mean-field Poisson-Boltzmann theory for ion size, dielectric decrement and ion-ion correlation. J Colloid Interface Sci 2023; 642:154-168. [PMID: 37003010 DOI: 10.1016/j.jcis.2023.03.027] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2022] [Revised: 02/24/2023] [Accepted: 03/02/2023] [Indexed: 03/28/2023]
Abstract
HYPOTHESIS Electrostatics of soft (ion-permeable) (bio)particles (e.g. microorganisms, core/shell colloids) in aqueous electrolytes is commonly formulated by the mean-field Poisson-Boltzmann theory and integration of the charge contributions from electrolyte ions and soft material. However, the effects connected to the size of the electrolyte ions and that of the structural charges carried by the particle, to dielectric decrement and ion-ion correlations on soft interface electrostatics have been so far considered at the margin, despite the limits of the Gouy theory for condensed and/or multivalent electrolytes. EXPERIMENTS Accordingly, we modify herein the Poisson-Boltzmann theory for core/shell (bio)interfaces to include the aforementioned molecular effects considered separately or concomitantly. The formalism is applicable for poorly to highly charged particles in the thin electric double layer regime and to unsymmetrical multivalent electrolytes. FINDINGS Computational examples of practical interests are discussed with emphasis on how each considered molecular effect or combination thereof affects the interfacial potential distribution depending on size and valence of cations and anions, size of particle charges, length scale of ionic correlations and shell-to-Debye layer thickness ratio. The origins of here-evidenced pseudo-harmonic potential profile and ion size-dependent screening of core/shell particle charges are detailed. In addition, the existence and magnitude of the Donnan potential when reached in the shell layer are shown to depend on the excluded volumes of the electrolyte ions.
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14
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Kamat S, Kumari M. Emergence of microbial resistance against nanoparticles: Mechanisms and strategies. Front Microbiol 2023; 14:1102615. [PMID: 36778867 PMCID: PMC9909277 DOI: 10.3389/fmicb.2023.1102615] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2022] [Accepted: 01/03/2023] [Indexed: 01/28/2023] Open
Abstract
Antimicrobial nanoparticles have gained the status of a new generation of drugs that can kill bacterial pathogens by multiple means; however, nanoparticle resistance acquired by some bacterial pathogens has evoked a cause of concern. Several reports suggested that bacteria can develop nanoparticles, specifically metal nanoparticle resistance, by mechanisms: nanoparticle transformation-induced oxidative stress, membrane alterations, reversible adaptive resistance, irreversible modifications to cell division, and a change in bacterial motility and resistance. Surface properties, concentration and aggregation of nanoparticles, biofilm forming and metal exclusion capacity, and R plasmid and flagellin synthesis by bacteria are crucial factors in the development of nanoparticle resistance in bacteria. Studies reported the resistance reversal by modifying the surface corona of nanoparticles or inhibiting flagellin production by bacterial pathogens. Furthermore, strict regulation regarding the use and disposal of nano-waste across the globe, the firm knowledge of microbe-nanoparticle interaction, and the regulated disposal of nanoparticles in soil and water is required to prevent microbes from developing nanoparticle resistance.
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15
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Ammendolia MG, De Berardis B. Nanoparticle Impact on the Bacterial Adaptation: Focus on Nano-Titania. NANOMATERIALS (BASEL, SWITZERLAND) 2022; 12:3616. [PMID: 36296806 PMCID: PMC9609019 DOI: 10.3390/nano12203616] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/23/2022] [Revised: 09/29/2022] [Accepted: 10/11/2022] [Indexed: 06/16/2023]
Abstract
Titanium dioxide nanoparticles (nano-titania/TiO2 NPs) are used in different fields and applications. However, the release of TiO2 NPs into the environment has raised concerns about their biosafety and biosecurity. In light of the evidence that TiO2 NPs could be used to counteract antibiotic resistance, they have been investigated for their antibacterial activity. Studies reported so far indicate a good performance of TiO2 NPs against bacteria, alone or in combination with antibiotics. However, bacteria are able to invoke multiple response mechanisms in an attempt to adapt to TiO2 NPs. Bacterial adaption arises from global changes in metabolic pathways via the modulation of regulatory networks and can be related to single-cell or multicellular communities. This review describes how the impact of TiO2 NPs on bacteria leads to several changes in microorganisms, mainly during long-term exposure, that can evolve towards adaptation and/or increased virulence. Strategies employed by bacteria to cope with TiO2 NPs suggest that their use as an antibacterial agent has still to be extensively investigated from the point of view of the risk of adaptation, to prevent the development of resistance. At the same time, possible effects on increased virulence following bacterial target modifications by TiO2 NPs on cells or tissues have to be considered.
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16
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Yeap CSY, Nguyen NHA, Spanek R, Too CC, Benes V, Provaznik J, Cernik M, Sevcu A. Dissolved iron released from nanoscale zero-valent iron (nZVI) activates the defense system in bacterium Pseudomonas putida, leading to high tolerance to oxidative stress. JOURNAL OF HAZARDOUS MATERIALS 2022; 439:129627. [PMID: 35872458 DOI: 10.1016/j.jhazmat.2022.129627] [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: 04/28/2022] [Revised: 07/03/2022] [Accepted: 07/15/2022] [Indexed: 06/15/2023]
Abstract
Nanoscale zero-valent iron (nZVI) has increasingly been applied to remediate aquifers polluted by organochlorines or heavy metals. As a result, bacteria in the vicinity of remediate action can be stressed by surplus iron released from nZVI. However, the understanding of the iron stress defense pathways during this process is currently incomplete. Therefore, we aimed to elucidate the physiological and transcriptomic response of the bacterium, Pseudomonas putida NCTC 10936, to 100 mg/L of nZVI and 44.5 µg/L of dissolved iron obtained from nZVI suspension. Cell viability was neither affected by nZVI nor dissolved iron, although the dissolved iron caused stress that altered the cell physiology and caused the generation of smaller cells, whereas cells were elongated in the presence of nZVI. Transcriptomic analysis confirmed the observed stronger physiological effect caused by dissolved iron (in total 3839 differentially expressed genes [DEGs]) than by nZVI (945 DEGs). Dissolved iron (but not nZVI) activated genes involved in oxidative stress-related pathways, antioxidant activity, carbohydrate and energy metabolism, but downregulated genes associated with flagellar assembly proteins and two-component systems involved in sensing external stimuli. As a result, bacteria very effectively faced oxidative insults and cell viability was not affected.
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Affiliation(s)
- Cheryl S Y Yeap
- Institute for Nanomaterials Advanced Technologies and Innovation, Technical University of Liberec, Bendlova 1409/7, 46117 Liberec 1, Czechia; Faculty of Mechatronics, Informatics and Interdisciplinary Studies, Technical University of Liberec, Studentská 2, 461 17 Liberec 1, Czechia
| | - Nhung H A Nguyen
- Institute for Nanomaterials Advanced Technologies and Innovation, Technical University of Liberec, Bendlova 1409/7, 46117 Liberec 1, Czechia
| | - Roman Spanek
- Institute for Nanomaterials Advanced Technologies and Innovation, Technical University of Liberec, Bendlova 1409/7, 46117 Liberec 1, Czechia; Faculty of Mechatronics, Informatics and Interdisciplinary Studies, Technical University of Liberec, Studentská 2, 461 17 Liberec 1, Czechia
| | - Chin Chin Too
- Department of Biochemistry and Microbiology, Ghent University, K. L. Ledeganckstraat 35, Campus Ledeganck, 9000 Ghent, Belgium
| | - Vladimir Benes
- Genomics Core Facility, European Molecular Biology Laboratory of Heidelberg, Meyerhofstrasse 1, 69117 Heidelberg, Germany
| | - Jan Provaznik
- Genomics Core Facility, European Molecular Biology Laboratory of Heidelberg, Meyerhofstrasse 1, 69117 Heidelberg, Germany
| | - Miroslav Cernik
- Institute for Nanomaterials Advanced Technologies and Innovation, Technical University of Liberec, Bendlova 1409/7, 46117 Liberec 1, Czechia
| | - Alena Sevcu
- Institute for Nanomaterials Advanced Technologies and Innovation, Technical University of Liberec, Bendlova 1409/7, 46117 Liberec 1, Czechia; Faculty of Science, Humanities and Education, Technical University of Liberec, Studentská 2, 461 17 Liberec 1, Czechia.
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17
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Sharma P, Kumari R, Yadav M, Lal R. Evaluation of TiO 2 Nanoparticles Physicochemical Parameters Associated with their Antimicrobial Applications. Indian J Microbiol 2022; 62:338-350. [PMID: 35974921 PMCID: PMC9375816 DOI: 10.1007/s12088-022-01018-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2022] [Accepted: 03/22/2022] [Indexed: 11/05/2022] Open
Abstract
Titanium dioxide nanoparticles (TiO2NPs) usage is increasing in everyday consumer products, hence, assessing their toxic impacts on living organisms and environment is essential. Various studies have revealed the significant role of TiO2NPs physicochemical properties on their toxicity. However, TiO2NPs are still poorly characterized with respect to their physicochemical properties, and environmental factors influencing their toxicity are either ignored or are too complex to be assessed under laboratory conditions. The outcomes of these studies are diverse and inconsistent due to lack of standard protocols. TiO2NPs toxicity also differs for in vivo and in vitro systems, which must also be considered during standardization of protocols to maintain uniformity and reproducibility of results. This review critically evaluates impact of different physicochemical parameters of TiO2NPs and other experimental conditions, employed in different laboratories in determining their toxicity towards bacteria. These important observations may be helpful in evaluation of environmental risks posed by these nanoparticles and this can further assist regulatory bodies in policymaking.
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Affiliation(s)
- Poonam Sharma
- Department of Zoology, Gargi College, University of Delhi, New Delhi, 110049 India
| | - Rekha Kumari
- Molecular Microbiology and Bioinformatics Laboratory, Department of Zoology, University of Delhi, Miranda House, Delhi, 110007 India
| | - Meena Yadav
- Department of Zoology, Maitreyi College, University of Delhi, New Delhi, India
| | - Rup Lal
- The Energy and Resources Institute, IHC Complex, Lodhi Road, New Delhi, 110003 India
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18
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Aude Luppi VE, Oppezzo OJ, Fidalgo de Cortalezzi MM. Comparative assessment of oxygen uptake rate of activated sludge and Escherichia coli exposed to nanomaterials. CHEMICAL ENGINEERING JOURNAL ADVANCES 2022. [DOI: 10.1016/j.ceja.2022.100351] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022] Open
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19
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Baranowska-Wójcik E. Factors Conditioning the Potential Effects TiO2 NPs Exposure on Human Microbiota: a Mini-Review. Biol Trace Elem Res 2021; 199:4458-4465. [PMID: 33447907 PMCID: PMC8516783 DOI: 10.1007/s12011-021-02578-5] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/08/2020] [Accepted: 01/05/2021] [Indexed: 01/07/2023]
Abstract
The recent years have seen a significant interest in the applications of nanotechnology in various facets of our lives. Due to their increasingly widespread use, human exposure to nanoparticles (NPs) is fast becoming unavoidable. Among the wide group of nanoparticles currently employed in industry, titanium dioxide nanoparticles, TiO2 NPs, are particularly popular. Due to its white colour, TiO2 is widely used as a whitening food additive (E 171). Yet, there have been few studies aimed at determining its direct impact on bacteria, while the available data suggest that TiO2 NPs may influence microbiota causing problems such as inflammatory bowel disease, obesity, or immunological disorders. Indeed, there are increasing concerns that its presence may lead to intestinal barrier impairment, including dysbiosis of intestinal microbiota. This article aims to present an overview of studies conducted to date with regard to the impact of TiO2 NPs on human microbiota as well as factors that can affect the same. Such information is necessary if we are to conclusively determine the potential toxicity of inorganic nanoparticles.
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Affiliation(s)
- Ewa Baranowska-Wójcik
- Department of Biotechnology, Microbiology and Human Nutrition, University of Life Sciences in Lublin, Skromna 8, Lublin, Poland.
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20
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Pagnout C, Razafitianamaharavo A, Sohm B, Caillet C, Beaussart A, Delatour E, Bihannic I, Offroy M, Duval JFL. Osmotic stress and vesiculation as key mechanisms controlling bacterial sensitivity and resistance to TiO 2 nanoparticles. Commun Biol 2021; 4:678. [PMID: 34083706 PMCID: PMC8175758 DOI: 10.1038/s42003-021-02213-y] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2020] [Accepted: 05/11/2021] [Indexed: 02/04/2023] Open
Abstract
Toxicity mechanisms of metal oxide nanoparticles towards bacteria and underlying roles of membrane composition are still debated. Herein, the response of lipopolysaccharide-truncated Escherichia coli K12 mutants to TiO2 nanoparticles (TiO2NPs, exposure in dark) is addressed at the molecular, single cell, and population levels by transcriptomics, fluorescence assays, cell nanomechanics and electrohydrodynamics. We show that outer core-free lipopolysaccharides featuring intact inner core increase cell sensitivity to TiO2NPs. TiO2NPs operate as membrane strippers, which induce osmotic stress, inactivate cell osmoregulation and initiate lipid peroxidation, which ultimately leads to genesis of membrane vesicles. In itself, truncation of lipopolysaccharide inner core triggers membrane permeabilization/depolarization, lipid peroxidation and hypervesiculation. In turn, it favors the regulation of TiO2NP-mediated changes in cell Turgor stress and leads to efficient vesicle-facilitated release of damaged membrane components. Remarkably, vesicles further act as electrostatic baits for TiO2NPs, thereby mitigating TiO2NPs toxicity. Altogether, we highlight antagonistic lipopolysaccharide-dependent bacterial responses to nanoparticles and we show that the destabilized membrane can generate unexpected resistance phenotype.
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Affiliation(s)
| | | | | | | | | | - Eva Delatour
- Université de Lorraine, CNRS, LIEC, Metz, France
| | | | - Marc Offroy
- Université de Lorraine, CNRS, LIEC, Nancy, France
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21
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Ariyadasa S, Abeysekera G, Billington C, Fee C, Pang L. Growth phase-dependent surface properties of Legionella pneumophila and their role in adhesion to stainless steel coated QCM-D sensors. Lett Appl Microbiol 2021; 73:257-267. [PMID: 34028067 DOI: 10.1111/lam.13510] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2020] [Revised: 04/08/2021] [Accepted: 05/17/2021] [Indexed: 11/29/2022]
Abstract
Legionella pneumophila cell surface hydrophobicity and charge are important determinants of their mobility and persistence in engineered water systems (EWS). These surface properties may differ depending on the growth phase of L. pneumophila resulting in variable adhesion and persistence within EWS. We describe the growth-dependent variations in L. pneumophila cell surface hydrophobicity and surface charge using the microbial adhesion to hydrocarbon assay and microelectrophoresis, respectively, and their role in cell adhesion to stainless steel using a quartz crystal microbalance with dissipation (QCM-D) monitoring instrument. We observed a steady increase in L. pneumophila hydrophobicity during their lifecycle in culture media. Cell surfaces of stationary phase L. pneumophila were significantly more hydrophobic than their lag and midexponential counterparts. No significant changes in L. pneumophila cell surface charge were noted. Morphology of L. pneumophila remained relatively constant throughout their lifecycle. In the QCM-D study, lag and exponential phase L. pneumophila weakly adhered to stainless steel surfaces resulting in viscoelastic layers. In contrast, stationary phase bacteria were tightly and irreversibly bound to the surfaces, forming rigid layers. Our results suggest that the stationary phase of L. pneumophila would highly favour their adhesion to plumbing surfaces and persistence in EWS.
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Affiliation(s)
- S Ariyadasa
- Institute of Environmental Science and Research, Christchurch, New Zealand.,School of Biological Sciences, University of Canterbury, Christchurch, New Zealand
| | - G Abeysekera
- Institute of Environmental Science and Research, Christchurch, New Zealand
| | - C Billington
- Institute of Environmental Science and Research, Christchurch, New Zealand
| | - C Fee
- School of Product Design and Biomolecular Interaction Centre, University of Canterbury, Christchurch, New Zealand
| | - L Pang
- Institute of Environmental Science and Research, Christchurch, New Zealand
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22
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Baranowska-Wójcik E, Gustaw K, Szwajgier D, Oleszczuk P, Pawlikowska-Pawlęga B, Pawelec J, Kapral-Piotrowska J. Four Types of TiO 2 Reduced the Growth of Selected Lactic Acid Bacteria Strains. Foods 2021; 10:foods10050939. [PMID: 33923019 PMCID: PMC8146636 DOI: 10.3390/foods10050939] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2021] [Revised: 04/14/2021] [Accepted: 04/22/2021] [Indexed: 12/16/2022] Open
Abstract
Food-grade titanium dioxide (TiO2) containing a nanoparticle fraction (TiO2 NPs -nanoparticles) is widely used as a food additive (E171 in the EU). In recent years, it has increasingly been raising controversies as to the presence or absence of its harmful effects on the gastrointestinal microbiota. The complexity and variability of microbiota species present in the human gastrointestinal tract impede the assessment of the impact of food additives on this ecosystem. As unicellular organisms, bacteria are a very convenient research model for investigation of the toxicity of nanoparticles. We examined the effect of TiO2 (three types of food-grade E171 and one TiO2 NPs, 21 nm) on the growth of 17 strains of lactic acid bacteria colonizing the human digestive tract. Each bacterial strain was treated with TiO2 at four concentrations (60, 150, 300, and 600 mg/L TiO2). The differences in the growth of the individual strains were caused by the type and concentration of TiO2. It was shown that the growth of a majority of the analyzed strains was decreased by the application of E171 and TiO2 NPs already at the concentration of 150 and 300 mg/L. At the highest dose (600 mg/L) of the nanoparticles, the reactions of the bacteria to the different TiO2 types used in the experiment varied.
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Affiliation(s)
- Ewa Baranowska-Wójcik
- Department of Biotechnology, Microbiology and Human Nutrition, University of Life Sciences, Skromna Street 8, 20-704 Lublin, Poland;
- Correspondence: (E.B.-W.); (D.S.); Tel.: +48-81-462-33-94 (E.B.-W.); Tel.: +48-81-462-33-68 (D.S.)
| | - Klaudia Gustaw
- Department of Biotechnology, Microbiology and Human Nutrition, University of Life Sciences, Skromna Street 8, 20-704 Lublin, Poland;
| | - Dominik Szwajgier
- Department of Biotechnology, Microbiology and Human Nutrition, University of Life Sciences, Skromna Street 8, 20-704 Lublin, Poland;
- Correspondence: (E.B.-W.); (D.S.); Tel.: +48-81-462-33-94 (E.B.-W.); Tel.: +48-81-462-33-68 (D.S.)
| | - Patryk Oleszczuk
- Department of Radiochemistry and Environmental Chemistry, Faculty of Chemistry, Maria Curie-Skłodowska University, 20-031 Lublin, Poland;
| | - Bożena Pawlikowska-Pawlęga
- Department of Functional Anatomy and Cytobiology, Faculty of Biology and Biotechnology, Institute of Biological Sciences, Maria Curie-Skłodowska University, Akademicka 19, 20-033 Lublin, Poland; (B.P.-P.); (J.K.-P.)
| | - Jarosław Pawelec
- Institute Microscopic Laboratory, Faculty of Biology and Biotechnology, Institute of Biological Sciences, Maria Curie-Skłodowska University, Akademicka 19, 20-033 Lublin, Poland;
| | - Justyna Kapral-Piotrowska
- Department of Functional Anatomy and Cytobiology, Faculty of Biology and Biotechnology, Institute of Biological Sciences, Maria Curie-Skłodowska University, Akademicka 19, 20-033 Lublin, Poland; (B.P.-P.); (J.K.-P.)
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Abstract
Pathogenic microorganisms can spread throughout the world population, as the current COVID-19 pandemic has dramatically demonstrated. In this scenario, a protection against pathogens and other microorganisms can come from the use of photoactive materials as antimicrobial agents able to hinder, or at least limit, their spreading by means of photocatalytically assisted processes activated by light—possibly sunlight—promoting the formation of reactive oxygen species (ROS) that can kill microorganisms in different matrices such as water or different surfaces without affecting human health. In this review, we focus the attention on TiO2 nanoparticle-based antimicrobial materials, intending to provide an overview of the most promising synthetic techniques, toward possible large-scale production, critically review the capability of such materials to promote pathogen (i.e., bacteria, virus, and fungi) inactivation, and, finally, take a look at selected technological applications.
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24
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Tang X, Zhang S, Zhou H, Zhou B, Liu S, Yang Z. The role of electrostatic potential polarization in the translocation of graphene quantum dots across membranes. NANOSCALE 2020; 12:2732-2739. [PMID: 31951244 DOI: 10.1039/c9nr09258g] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Graphene quantum dots (GQDs) have shown promising potential applications in the field of biomedicine. To date, understanding the GQD-cell membrane interactions remains a key issue in developing their biomedical applications, such as targeted drug delivery and bio-imaging. In this study, we mainly shed light on the mechanism of how to control the interactions between GQDs and membranes by tuning the electrostatic potential (EP) of GQDs. Charge distributions at the edge sites were adjusted to mimic the modified EP of GQDs, given that the physicochemical properties of GQDs are usually regulated and determined by the grafted groups and doped atoms at edges. We found that the dynamics of GQDs in the GQD-membrane system can be regulated effectively by modulating the EP of GQDs, which is not only determined by the direct GQD-cell interactions but also by the GQD-water interactions. GQDs with non- or less-polarized EP are hydrophobic, and they can easily translocate into the inner membrane from the bulk water because of the decreased GQD-POPC van der Waals interactions and the favorable dehydration process. In the case of a GQD with more polarized EP, the nanomaterial prefers to adsorb onto the membrane surface due to the strong electrostatic attraction between the GQD and lipid headgroups, and especially, the high dehydration free energy of GQDs can even lead to transient detachment from the surface. These findings would be helpful to understand the interactions between GQD-based nanomaterials and cell membranes, facilitating the rational design of GQD-related biomedicines.
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Affiliation(s)
- Xiaofeng Tang
- Institute of Quantitative Biology and Medicine, State Key Laboratory of Radiation Medicine and Protection, School of Radiation Medicine and Protection, Collaborative Innovation Center of Radiological Medicine of Jiangsu Higher Education Institutions, Soochow University, Jiangsu 215123, China.
| | - Shitong Zhang
- Institute of Quantitative Biology and Medicine, State Key Laboratory of Radiation Medicine and Protection, School of Radiation Medicine and Protection, Collaborative Innovation Center of Radiological Medicine of Jiangsu Higher Education Institutions, Soochow University, Jiangsu 215123, China.
| | - Hong Zhou
- Institute of Quantitative Biology and Medicine, State Key Laboratory of Radiation Medicine and Protection, School of Radiation Medicine and Protection, Collaborative Innovation Center of Radiological Medicine of Jiangsu Higher Education Institutions, Soochow University, Jiangsu 215123, China.
| | - Bo Zhou
- School of Electronic Engineering, Chengdu Technological University, Chengdu 611730, China
| | - Shengtang Liu
- Institute of Quantitative Biology and Medicine, State Key Laboratory of Radiation Medicine and Protection, School of Radiation Medicine and Protection, Collaborative Innovation Center of Radiological Medicine of Jiangsu Higher Education Institutions, Soochow University, Jiangsu 215123, China.
| | - Zaixing Yang
- Institute of Quantitative Biology and Medicine, State Key Laboratory of Radiation Medicine and Protection, School of Radiation Medicine and Protection, Collaborative Innovation Center of Radiological Medicine of Jiangsu Higher Education Institutions, Soochow University, Jiangsu 215123, China.
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25
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Baysal A, Saygin H, Ustabasi GS. An insight into the dependency on sample preparation for (eco) toxicity assessment of TiO 2 nanoparticles. ENVIRONMENTAL MONITORING AND ASSESSMENT 2020; 192:144. [PMID: 31989337 DOI: 10.1007/s10661-020-8107-7] [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: 06/01/2019] [Accepted: 01/21/2020] [Indexed: 06/10/2023]
Abstract
Assessing the environmental hazard of nanoparticles can be a challenging task using various testing strategies. However, to our knowledge, no information is available about the impact of the sample preparation on the toxicity and toxicity mechanism of nanoparticles. For this aim, three sample preparation methods and their available toxicity procedures were conducted to examine the (eco) toxicity of TiO2 nanoparticles using bacteria model system. To detail understanding of the effect of sample preparation, the key events on the inhibition were examined by physicochemical and antioxidant responses. The findings showed that the physicochemical and toxicological behavior of the tested TiO2 NPs varied according to the sample preparation method.
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Affiliation(s)
- Asli Baysal
- Health Services Vocational School of Higher Education, T.C. Istanbul Aydin University, Sefakoy Kucukcekmece, 34295, Istanbul, Turkey.
| | - Hasan Saygin
- Application and Research Center for Advanced Studies, T.C. Istanbul Aydin University, Sefakoy Kucukcekmece, 34295, Istanbul, Turkey
| | - Gul Sirin Ustabasi
- Health Services Vocational School of Higher Education, T.C. Istanbul Aydin University, Sefakoy Kucukcekmece, 34295, Istanbul, Turkey
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26
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Liao C, Li Y, Tjong SC. Visible-Light Active Titanium Dioxide Nanomaterials with Bactericidal Properties. NANOMATERIALS (BASEL, SWITZERLAND) 2020; 10:E124. [PMID: 31936581 PMCID: PMC7022691 DOI: 10.3390/nano10010124] [Citation(s) in RCA: 74] [Impact Index Per Article: 18.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/06/2019] [Revised: 01/04/2020] [Accepted: 01/06/2020] [Indexed: 12/16/2022]
Abstract
This article provides an overview of current research into the development, synthesis, photocatalytic bacterial activity, biocompatibility and cytotoxic properties of various visible-light active titanium dioxide (TiO2) nanoparticles (NPs) and their nanocomposites. To achieve antibacterial inactivation under visible light, TiO2 NPs are doped with metal and non-metal elements, modified with carbonaceous nanomaterials, and coupled with other metal oxide semiconductors. Transition metals introduce a localized d-electron state just below the conduction band of TiO2 NPs, thereby narrowing the bandgap and causing a red shift of the optical absorption edge into the visible region. Silver nanoparticles of doped TiO2 NPs experience surface plasmon resonance under visible light excitation, leading to the injection of hot electrons into the conduction band of TiO2 NPs to generate reactive oxygen species (ROS) for bacterial killing. The modification of TiO2 NPs with carbon nanotubes and graphene sheets also achieve the efficient creation of ROS under visible light irradiation. Furthermore, titanium-based alloy implants in orthopedics with enhanced antibacterial activity and biocompatibility can be achieved by forming a surface layer of Ag-doped titania nanotubes. By incorporating TiO2 NPs and Cu-doped TiO2 NPs into chitosan or the textile matrix, the resulting polymer nanocomposites exhibit excellent antimicrobial properties that can have applications as fruit/food wrapping films, self-cleaning fabrics, medical scaffolds and wound dressings. Considering the possible use of visible-light active TiO2 nanomaterials for various applications, their toxicity impact on the environment and public health is also addressed.
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Affiliation(s)
- Chengzhu Liao
- Department of Materials Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, China
| | - Yuchao Li
- Department of Materials Science and Engineering, Liaocheng University, Liaocheng 252000, China;
| | - Sie Chin Tjong
- Department of Physics, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong 999077, China
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Lekamge S, Ball AS, Shukla R, Nugegoda D. The Toxicity of Nanoparticles to Organisms in Freshwater. REVIEWS OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY 2020; 248:1-80. [PMID: 30413977 DOI: 10.1007/398_2018_18] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Nanotechnology is a rapidly growing industry yielding many benefits to society. However, aquatic environments are at risk as increasing amounts of nanoparticles (NPs) are contaminating waterbodies causing adverse effects on aquatic organisms. In this review, the impacts of environmental exposure to NPs, the influence of the physicochemical characteristics of NPs and the surrounding environment on toxicity and mechanisms of toxicity together with NP bioaccumulation and trophic transfer are assessed with a focus on their impacts on bacteria, algae and daphnids. We identify several gaps which need urgent attention in order to make sound decisions to protect the environment. These include uncertainty in both estimated and measured environmental concentrations of NPs for reliable risk assessment and for regulating the NP industry. In addition toxicity tests and risk assessment methodologies specific to NPs are still at the research and development stage. Also conflicting and inconsistent results on physicochemical characteristics and the fate and transport of NPs in the environment suggest the need for further research. Finally, improved understanding of the mechanisms of NP toxicity is crucial in risk assessment of NPs, since conventional toxicity tests may not reflect the risks associated with NPs. Behavioural effects may be more sensitive and would be efficient in certain situations compared with conventional toxicity tests due to low NP concentrations in field conditions. However, the development of such tests is still lacking, and further research is recommended.
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Affiliation(s)
- Sam Lekamge
- Ecotoxicology Research Group, Centre for Environmental Sustainability and Remediation, School of Science, RMIT University, Bundoora, VIC, Australia.
| | - Andrew S Ball
- Centre for Environmental Sustainability and Remediation, School of Science, RMIT University, Bundoora, VIC, Australia
| | - Ravi Shukla
- Nanobiotechnology Research Laboratory, RMIT University, Melbourne, VIC, Australia
| | - Dayanthi Nugegoda
- Ecotoxicology Research Group, Centre for Environmental Sustainability and Remediation, School of Science, RMIT University, Bundoora, VIC, Australia
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28
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Baek S, Joo SH, Su C, Toborek M. Toxicity of ZnO/TiO 2 -conjugated carbon-based nanohybrids on the coastal marine alga Thalassiosira pseudonana. ENVIRONMENTAL TOXICOLOGY 2020; 35:87-96. [PMID: 31515868 PMCID: PMC7144345 DOI: 10.1002/tox.22845] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/08/2019] [Revised: 08/26/2019] [Accepted: 08/30/2019] [Indexed: 05/15/2023]
Abstract
Increasing consumption of metal-oxide nanoparticles (NPs) and carbon-based nanomaterials has caused significant concern about their potential hazards in aquatic environments. The release of NPs into aquatic environments could result in adsorption of NPs on microorganisms. While metal-oxide NP-conjugated carbon-based nanohybrids (NHs) may exhibit enhanced toxicity toward microorganisms due to their large surface area and the generation of reactive oxygen species (ROS), there is a lack of information regarding the ecotoxicological effects of NHs on marine diatom algae, which are an indicator of marine pollution. Moreover, there is scant information on toxicity mechanisms of NHs on aquatic organisms. In this study, four NHs (ie, ZnO-conjugated graphene oxide [GO], ZnO-conjugated carbon nanotubes [CNTs], TiO2 -conjugated GO, and TiO2 -conjugated CNT) that were synthesized by a hydrothermal method were investigated for their toxicity effects on a Thalassiosira pseudonana marine diatom. The in vitro cellular viability and ROS formation employed at the concentration ranges of 50 and 100 mg/L of NHs over 72 hours revealed that ZnO-GO had the most negative effect on T. pseudonana. The primary mechanism identified was the generation of ROS and GO-induced dispersion that caused electrostatic repulsion, preventing aggregation, and an increase in surface areas of NHs. In contrast to GO-induced dispersion, large aggregates were observed in ZnO/TiO2 -conjugated CNT-based NHs. The scanning electron microscopy images suggest that NHs covered algae cells and interacted with them (shading effects); this reduced light availability for photosynthesis. Detailed in vitro toxicity effects and mechanisms that cause high adverse acute toxicity on T. pseudonana were unveiled; this implied concerns about potential hazards of these mechanisms in aquatic ecosystems.
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Affiliation(s)
- Soyoung Baek
- Department of Civil, Architectural, and Environmental Engineering, University of Miami, Coral Gables, Florida
| | - Sung Hee Joo
- Department of Civil, Architectural, and Environmental Engineering, University of Miami, Coral Gables, Florida
| | - Chunming Su
- Groundwater, Watershed, and Ecosystem Restoration Division, National Risk Management Research Laboratory, Office of Research and Development, U.S. Environmental Protection Agency, Ada, Oklahoma
| | - Michal Toborek
- Department of Biochemistry and Molecular Biology, University of Miami, Miller School of Medicine, Miami, Florida
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Elespuru R, Pfuhler S, Aardema MJ, Chen T, Doak SH, Doherty A, Farabaugh CS, Kenny J, Manjanatha M, Mahadevan B, Moore MM, Ouédraogo G, Stankowski LF, Tanir JY. Genotoxicity Assessment of Nanomaterials: Recommendations on Best Practices, Assays, and Methods. Toxicol Sci 2019; 164:391-416. [PMID: 29701824 DOI: 10.1093/toxsci/kfy100] [Citation(s) in RCA: 56] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Nanomaterials (NMs) present unique challenges in safety evaluation. An international working group, the Genetic Toxicology Technical Committee of the International Life Sciences Institute's Health and Environmental Sciences Institute, has addressed issues related to the genotoxicity assessment of NMs. A critical review of published data has been followed by recommendations on methods alterations and best practices for the standard genotoxicity assays: bacterial reverse mutation (Ames); in vitro mammalian assays for mutations, chromosomal aberrations, micronucleus induction, or DNA strand breaks (comet); and in vivo assays for genetic damage (micronucleus, comet and transgenic mutation assays). The analysis found a great diversity of tests and systems used for in vitro assays; many did not meet criteria for a valid test, and/or did not use validated cells and methods in the Organization for Economic Co-operation and Development Test Guidelines, and so these results could not be interpreted. In vivo assays were less common but better performed. It was not possible to develop conclusions on test system agreement, NM activity, or mechanism of action. However, the limited responses observed for most NMs were consistent with indirect genotoxic effects, rather than direct interaction of NMs with DNA. We propose a revised genotoxicity test battery for NMs that includes in vitro mammalian cell mutagenicity and clastogenicity assessments; in vivo assessments would be added only if warranted by information on specific organ exposure or sequestration of NMs. The bacterial assays are generally uninformative for NMs due to limited particle uptake and possible lack of mechanistic relevance, and are thus omitted in our recommended test battery for NM assessment. Recommendations include NM characterization in the test medium, verification of uptake into target cells, and limited assay-specific methods alterations to avoid interference with uptake or endpoint analysis. These recommendations are summarized in a Roadmap guideline for testing.
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Affiliation(s)
- Rosalie Elespuru
- Division of Biology, Chemistry and Materials Science, US Food and Drug Administration, CDRH/OSEL, Silver Spring, Maryland 20993
| | - Stefan Pfuhler
- The Procter & Gamble Company, Mason Business Centre, Mason, Ohio 45040
| | | | - Tao Chen
- Division of Genetic and Molecular Toxicology, US Food and Drug Administration, NCTR, Jefferson, Arkansas 72079
| | - Shareen H Doak
- Institute of Life Science, Swansea University Medical School, Swansea, Wales SA2 8PP, UK
| | - Ann Doherty
- Discovery Safety, Drug Safety and Metabolism, IMED Biotech Unit, AstraZeneca Genetic Toxicology, AstraZeneca, Cambridge CB4 0WG, UK
| | | | - Julia Kenny
- Genetic Toxicology & Photosafety, David Jack Centre for Research & Development, GlaxoSmithKline, Ware, Hertfordshire SG12 0DP, UK
| | - Mugimane Manjanatha
- Division of Genetic and Molecular Toxicology, US Food and Drug Administration, NCTR, Jefferson, Arkansas 72079
| | - Brinda Mahadevan
- Global Pre-clinical Development Innovation & Development, Established Pharmaceuticals, Abbott, Mumbai 400072, India
| | | | | | | | - Jennifer Y Tanir
- ILSI Health and Environmental Sciences Institute (HESI), Washington, District of Columbia 20005
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Levy M, Chowdhury PP, Nagpal P. Quantum dot therapeutics: a new class of radical therapies. J Biol Eng 2019; 13:48. [PMID: 31160923 PMCID: PMC6542014 DOI: 10.1186/s13036-019-0173-4] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2019] [Accepted: 04/21/2019] [Indexed: 12/12/2022] Open
Abstract
Traditional therapeutics and vaccines represent the bedrock of modern medicine, where isolated biochemical molecules or designed proteins have led to success in treating and preventing diseases. However, several adaptive pathogens, such as multidrug-resistant (MDR) superbugs, and rapidly evolving diseases, such as cancer, can evade such molecules very effectively. This poses an important problem since the rapid emergence of multidrug-resistance among microbes is one of the most pressing public health crises of our time-one that could claim more than 10 million lives and 100 trillion dollars annually by 2050. Several non-traditional antibiotics are now being developed that can survive in the face of adaptive drug resistance. One such versatile strategy is redox perturbation using quantum dot (QD) therapeutics. While redox molecules are nominally used by cells for intracellular signaling and other functions, specific generation of such species exogenously, using an electromagnetic stimulus (light, sound, magnetic field), can specifically kill the cells most vulnerable to such species. For example, recently QD therapeutics have shown tremendous promise by specifically generating superoxide intracellularly (using light as a trigger) to selectively eliminate a wide range of MDR pathogens. While the efficacy of such QD therapeutics was shown using in vitro studies, several apparent contradictions exist regarding QD safety and potential for clinical applications. In this review, we outline the design rules for creating specific QD therapies for redox perturbation; summarize the parameters for choosing appropriate materials, size, and capping ligands to ensure their facile clearance; and highlight a potential path forward towards developing this new class of radical QD therapeutics.
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Affiliation(s)
- Max Levy
- Chemical and Biological Engineering, University of Colorado Boulder, Boulder, CO 80303 USA
- Renewable and Sustainable Energy Institute, University of Colorado Boulder, Boulder, CO 80303 USA
| | - Partha P. Chowdhury
- Chemical and Biological Engineering, University of Colorado Boulder, Boulder, CO 80303 USA
- Renewable and Sustainable Energy Institute, University of Colorado Boulder, Boulder, CO 80303 USA
| | - Prashant Nagpal
- Chemical and Biological Engineering, University of Colorado Boulder, Boulder, CO 80303 USA
- Renewable and Sustainable Energy Institute, University of Colorado Boulder, Boulder, CO 80303 USA
- Materials Science and Engineering, University of Colorado Boulder, Boulder, CO 80303 USA
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Singhatanadgit W, Toso M, Pratheepsawangwong B, Pimpin A, Srituravanich W. Titanium dioxide nanotubes of defined diameter enhance mesenchymal stem cell proliferation via JNK- and ERK-dependent up-regulation of fibroblast growth factor-2 by T lymphocytes. J Biomater Appl 2019; 33:997-1010. [PMID: 30757966 DOI: 10.1177/0885328218816565] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Long-term clinical success of a titanium implant not only depends upon osseointegration between implant and bone surface but also on the response of host immune cells. Following implantation of biomaterials, an inflammatory response, including T lymphocyte response, is ostensibly initiated by implant-cell interaction. However, little is known about the responses of T lymphocytes to titanium dioxide nanotubes. The present study aimed to explore the effect of titanium dioxide nanotubes on T lymphocytes in vitro and its biological consequences. The results of the present study showed that titanium dioxide nanotubes with diameter of 30-105 nm were non-cytotoxic to T lymphocytes, and the 105 nm titanium dioxide nanotube surface specifically possessed an ability to activate T lymphocytes, thus increasing DNA synthesis and cell proliferation. In addition, the 105 nm titanium dioxide nanotubes significantly activated the expression of FGF-2 gene and protein in T lymphocytes although smaller nanotubes (i.e. those with diameters of approximately 30 and 70 nm) had little effect on this. The present study investigated the mechanism by which 105 nm nanotubes stimulated FGF-2 expression in T lymphocytes by blocking key MAPK pathways. The inhibitors of JNK1/2/3 and ERK1/2 significantly inhibited 105 nm titanium dioxide nanotubes-induced FGF-2 expression. Corresponding to the increased expression of FGF-2, only the supernatant from T lymphocytes cultured on 105 nm nanotubes stimulated human mesenchymal stem cell proliferation. FGF-2 blocking antibody partially reversed the increased proliferation of human mesenchymal stem cells, supporting the role of T lymphocyte-derived FGF-2 in enhanced human mesenchymal stem cell proliferation. This suggests a significant role of T lymphocyte-titanium dioxide nanotube interaction in the proliferation of human mesenchymal stem cells, which is pivotal to the formation of new bone following implant placement.
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Affiliation(s)
| | - Montree Toso
- 1 Craniofacial Reconstruction Cluster, Faculty of Dentistry, Thammasat University, Thailand
| | | | - Alongkorn Pimpin
- 2 Department of Mechanical Engineering, Faculty of Engineering, Chulalongkorn University, Thailand
| | - Werayut Srituravanich
- 2 Department of Mechanical Engineering, Faculty of Engineering, Chulalongkorn University, Thailand
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Ramalingam V, Sundaramahalingam S, Rajaram R. Size-dependent antimycobacterial activity of titanium oxide nanoparticles against Mycobacterium tuberculosis. J Mater Chem B 2019. [DOI: 10.1039/c9tb00784a] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The titanium oxide nanoparticles showed excellent antibiofilm activity against Mycobacterium tuberculosis by inhibiting the colony formation and damage the cell wall leads to immature biofilm formation as well as inhibition of metabolic activity.
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Affiliation(s)
- Vaikundamoorthy Ramalingam
- DNA Barcoding and Marine Genomics Laboratory
- Department of Marine Science
- Bharathidasan University
- Tiruchirappalli
- India
| | | | - Rajendran Rajaram
- DNA Barcoding and Marine Genomics Laboratory
- Department of Marine Science
- Bharathidasan University
- Tiruchirappalli
- India
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Baek S, Joo SH, Blackwelder P, Toborek M. Effects of coating materials on antibacterial properties of industrial and sunscreen-derived titanium-dioxide nanoparticles on Escherichia coli. CHEMOSPHERE 2018; 208:196-206. [PMID: 29870909 DOI: 10.1016/j.chemosphere.2018.05.167] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/29/2017] [Revised: 05/12/2018] [Accepted: 05/27/2018] [Indexed: 05/12/2023]
Abstract
Organic or inorganic stabilizers are often used for coating nanoparticles (NPs) in consumer products. However, upon release of stabilized NPs into the environment, uncertainty exists as to the antimicrobial properties of NPs due to stabilizers and the resultant bioaccumulation in organisms. This study investigates antibacterial effects and subsequent mechanisms of TiO2 NPs on Escherichia coli (E. coli) in the presence and absence of stabilizers (CMC, PVP, and SiO2) commonly used in consumer products. Compared with uncoated TiO2 NPs, the presence of any stabilizers tested in this study increased toxicity of NPs and enhanced growth inhibition in E. coli. While the particle sizes of TiO2 were smaller as the result of coating with PVP or CMC and appeared to contribute to E. coli cell damage, the generation of reactive oxygen species (ROS) was independent of stabilizer type. In fact, coating with PVP and CMC exerted ROS scavenging properties. In contrast, increased ROS production was observed at higher concentrations of TiO2 and upon coating with SiO2. This impact of SiO2 can be related to the formation of a TiOSi chemical bond. The results of the present study emphasize the importance of nanoparticle coating to their anti-bacterial activity and toxicity.
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Affiliation(s)
- Soyoung Baek
- Department of Civil, Architectural, and Environmental Engineering, University of Miami, 1251 Memorial Dr. McArthur Engineering Building, Coral Gables, FL 33146-0630, USA
| | - Sung Hee Joo
- Department of Civil, Architectural, and Environmental Engineering, University of Miami, 1251 Memorial Dr. McArthur Engineering Building, Coral Gables, FL 33146-0630, USA.
| | - Pat Blackwelder
- Department of Marine Geosciences, University of Miami, 4600 Rickenbacker Causeway Miami, FL 33149-1098, USA; University of Miami Center for Advanced Microscopy (UMCAM), Department of Chemistry, 1301 Memorial Dr, Coral Gables, FL 33146-0630, USA
| | - Michal Toborek
- Department of Biochemistry and Molecular Biology, School of Medicine, University of Miami, 1011 NW 15th Street, Miami, FL, 33136, USA
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Radziwill-Bienkowska JM, Talbot P, Kamphuis JBJ, Robert V, Cartier C, Fourquaux I, Lentzen E, Audinot JN, Jamme F, Réfrégiers M, Bardowski JK, Langella P, Kowalczyk M, Houdeau E, Thomas M, Mercier-Bonin M. Toxicity of Food-Grade TiO 2 to Commensal Intestinal and Transient Food-Borne Bacteria: New Insights Using Nano-SIMS and Synchrotron UV Fluorescence Imaging. Front Microbiol 2018; 9:794. [PMID: 29740421 PMCID: PMC5928251 DOI: 10.3389/fmicb.2018.00794] [Citation(s) in RCA: 40] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2018] [Accepted: 04/09/2018] [Indexed: 11/13/2022] Open
Abstract
Titanium dioxide (TiO2) is commonly used as a food additive (E171 in the EU) for its whitening and opacifying properties. However, a risk of intestinal barrier disruption, including dysbiosis of the gut microbiota, is increasingly suspected because of the presence of a nano-sized fraction in this additive. We hypothesized that food-grade E171 and Aeroxyde P25 (identical to the NM-105 OECD reference nanomaterial in the European Union Joint Research Centre) interact with both commensal intestinal bacteria and transient food-borne bacteria under non-UV-irradiated conditions. Based on differences in their physicochemical properties, we expect a difference in their respective effects. To test these hypotheses, we chose a panel of eight Gram-positive/Gram-negative bacterial strains, isolated from different biotopes and belonging to the species Escherichia coli, Lactobacillus rhamnosus, Lactococcus lactis (subsp. lactis and cremoris), Streptococcus thermophilus, and Lactobacillus sakei. Bacterial cells were exposed to food-grade E171 vs. P25 in vitro and the interactions were explored with innovative (nano)imaging methods. The ability of bacteria to trap TiO2 was demonstrated using synchrotron UV fluorescence imaging with single cell resolution. Subsequent alterations in the growth profiles were shown, notably for the transient food-borne L. lactis and the commensal intestinal E. coli in contact with food-grade TiO2. However, for both species, the reduction in cell cultivability remained moderate, and the morphological and ultrastructural damages, observed with electron microscopy, were restricted to a small number of cells. E. coli exposed to food-grade TiO2 showed some internalization of TiO2 (7% of cells), observed with high-resolution nano-secondary ion mass spectrometry (Nano-SIMS) chemical imaging. Taken together, these data show that E171 may be trapped by commensal and transient food-borne bacteria within the gut. In return, it may induce some physiological alterations in the most sensitive species, with a putative impact on gut microbiota composition and functioning, especially after chronic exposure.
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Affiliation(s)
| | - Pauline Talbot
- Micalis Institute, INRA, AgroParisTech, Université Paris-Saclay, Jouy-en-Josas, France
| | - Jasper B J Kamphuis
- Toxalim (Research Centre in Food Toxicology), Université de Toulouse, INRA, ENVT, INP-Purpan, UPS, Toulouse, France
| | - Véronique Robert
- Micalis Institute, INRA, AgroParisTech, Université Paris-Saclay, Jouy-en-Josas, France
| | - Christel Cartier
- Toxalim (Research Centre in Food Toxicology), Université de Toulouse, INRA, ENVT, INP-Purpan, UPS, Toulouse, France
| | - Isabelle Fourquaux
- Faculté de Médecine Rangueil, Centre de Microscopie Electronique Appliquée à la Biologie (CMEAB), Toulouse, France
| | - Esther Lentzen
- Luxembourg Institute of Science and Technology (LIST), Material Research and Technology Department (MRT), Belvaux, Luxembourg
| | - Jean-Nicolas Audinot
- Luxembourg Institute of Science and Technology (LIST), Material Research and Technology Department (MRT), Belvaux, Luxembourg
| | | | | | - Jacek K Bardowski
- Institute of Biochemistry and Biophysics, Polish Academy of Sciences, Warsaw, Poland
| | - Philippe Langella
- Micalis Institute, INRA, AgroParisTech, Université Paris-Saclay, Jouy-en-Josas, France
| | - Magdalena Kowalczyk
- Institute of Biochemistry and Biophysics, Polish Academy of Sciences, Warsaw, Poland
| | - Eric Houdeau
- Toxalim (Research Centre in Food Toxicology), Université de Toulouse, INRA, ENVT, INP-Purpan, UPS, Toulouse, France
| | - Muriel Thomas
- Micalis Institute, INRA, AgroParisTech, Université Paris-Saclay, Jouy-en-Josas, France
| | - Muriel Mercier-Bonin
- Toxalim (Research Centre in Food Toxicology), Université de Toulouse, INRA, ENVT, INP-Purpan, UPS, Toulouse, France
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Charles S, Jomini S, Fessard V, Bigorgne-Vizade E, Rousselle C, Michel C. Assessment of the in vitro genotoxicity of TiO2 nanoparticles in a regulatory context. Nanotoxicology 2018; 12:357-374. [DOI: 10.1080/17435390.2018.1451567] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Affiliation(s)
- Sandrine Charles
- ANSES, Agence Nationale de Sécurité Sanitaire de l’alimentation, de l’environnement et du Travail, Direction de l’Evaluation des Risques, Unité Evaluation des Substances Chimiques, Maisons-Alfort, France
| | - Stéphane Jomini
- ANSES, Agence Nationale de Sécurité Sanitaire de l’alimentation, de l’environnement et du Travail, Direction de l’Evaluation des Risques, Unité Evaluation des Substances Chimiques, Maisons-Alfort, France
| | - Valérie Fessard
- ANSES, Agence Nationale de Sécurité Sanitaire de l’alimentation, de l’environnement et du Travail, Laboratoire de Fougères, Unité Toxicologie des Contaminants, Javené, France
| | - Emilie Bigorgne-Vizade
- ANSES, Agence Nationale de Sécurité Sanitaire de l’alimentation, de l’environnement et du Travail, Direction de l’Evaluation des Risques, Unité Evaluation des Substances Chimiques, Maisons-Alfort, France
| | - Christophe Rousselle
- ANSES, Agence Nationale de Sécurité Sanitaire de l’alimentation, de l’environnement et du Travail, Direction de l’Evaluation des Risques, Unité Evaluation des Substances Chimiques, Maisons-Alfort, France
| | - Cécile Michel
- ANSES, Agence Nationale de Sécurité Sanitaire de l’alimentation, de l’environnement et du Travail, Direction de l’Evaluation des Risques, Unité Evaluation des Substances Chimiques, Maisons-Alfort, France
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Nolte TM, Hartmann NB, Kleijn JM, Garnæs J, van de Meent D, Jan Hendriks A, Baun A. The toxicity of plastic nanoparticles to green algae as influenced by surface modification, medium hardness and cellular adsorption. AQUATIC TOXICOLOGY (AMSTERDAM, NETHERLANDS) 2017; 183:11-20. [PMID: 27978483 DOI: 10.1016/j.aquatox.2016.12.005] [Citation(s) in RCA: 209] [Impact Index Per Article: 29.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/31/2016] [Revised: 11/29/2016] [Accepted: 12/07/2016] [Indexed: 06/06/2023]
Abstract
To investigate processes possibly underlying accumulation and ecological effects of plastic nano-particles we have characterized their interaction with the cell wall of green algae. More specifically, we have investigated the influence of particle surface functionality and water hardness (Ca2+ concentration) on particle adsorption to algae cell walls. Polystyrene nanoparticles with different functional groups (non-functionalized, -COOH and -NH2) as well as coated (starch and PEG) gold nanoparticles were applied in these studies. Depletion measurements and atomic force microscopy (AFM) showed that adsorption of neutral and positively charged plastic nanoparticles onto the cell wall of P. subcapitata was stronger than that of negatively charged plastic particles. Results indicated that binding affinity is a function of both inter-particle and particle-cell wall interactions which are in turn influenced by the medium hardness and particle concentration. Physicochemical modelling using DLVO theory was used to interpret the experimental data, using also values for interfacial surface free energies. Our study shows that material properties and medium conditions play a crucial role in the rate and state of nanoparticle bio-adsorption for green algae. The results show that the toxicity of nanoparticles can be better described and assessed by using appropriate dose metrics including material properties, complexation/agglomeration behavior and cellular attachment and adsorption. The applied methodology provides an efficient and feasible approach for evaluating potential accumulation and hazardous effects of nanoparticles to algae caused by particle interactions with the algae cell walls.
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Affiliation(s)
- Tom M Nolte
- Department of Environmental Engineering, Technical University of Denmark, Miljøvej, B113, 2800 Kgs. Lyngby, Denmark; Radboud University Nijmegen, Institute for Water and Wetland Research, Department of Environmental Science, P.O. Box 9010, NL-6500 GL, Nijmegen, The Netherlands.
| | - Nanna B Hartmann
- Department of Environmental Engineering, Technical University of Denmark, Miljøvej, B113, 2800 Kgs. Lyngby, Denmark
| | - J Mieke Kleijn
- Physical Chemistry Soft Matter, Wageningen University, Stippeneng 4, NL-6708WE Wageningen, The Netherlands
| | - Jørgen Garnæs
- Danish Fundamental Metrology, Matematiktorvet 307, 2800 Kgs. Lyngby, Denmark
| | - Dik van de Meent
- Radboud University Nijmegen, Institute for Water and Wetland Research, Department of Environmental Science, P.O. Box 9010, NL-6500 GL, Nijmegen, The Netherlands; National Institute of Public Health and the Environment RIVM, P.O. Box 1, 3720 BA, Bilthoven, The Netherlands
| | - A Jan Hendriks
- Radboud University Nijmegen, Institute for Water and Wetland Research, Department of Environmental Science, P.O. Box 9010, NL-6500 GL, Nijmegen, The Netherlands
| | - Anders Baun
- Department of Environmental Engineering, Technical University of Denmark, Miljøvej, B113, 2800 Kgs. Lyngby, Denmark
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Lynch I, Afantitis A, Leonis G, Melagraki G, Valsami-Jones E. Strategy for Identification of Nanomaterials’ Critical Properties Linked to Biological Impacts: Interlinking of Experimental and Computational Approaches. CHALLENGES AND ADVANCES IN COMPUTATIONAL CHEMISTRY AND PHYSICS 2017. [DOI: 10.1007/978-3-319-56850-8_10] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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38
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Baccaro AL, Gutz IG. Quick cold preparation of TiO2 nanolayers on gold from P25 suspensions – film structure, voltammetric behavior and photocatalytic performance for the oxidation of EDTA under UVA-LED irradiation. Electrochim Acta 2016. [DOI: 10.1016/j.electacta.2016.08.048] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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39
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Assessment of agglomeration, co-sedimentation and trophic transfer of titanium dioxide nanoparticles in a laboratory-scale predator-prey model system. Sci Rep 2016; 6:31422. [PMID: 27530102 PMCID: PMC4987863 DOI: 10.1038/srep31422] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2015] [Accepted: 07/20/2016] [Indexed: 01/16/2023] Open
Abstract
Nano titanium dioxide (nTiO2) is the most abundantly released engineered nanomaterial (ENM) in aquatic environments. Therefore, it is prudent to assess its fate and its effects on lower trophic-level organisms in the aquatic food chain. A predator-and-prey-based laboratory microcosm was established using Paramecium caudatum and Escherichia coli to evaluate the effects of nTiO2. The surface interaction of nTiO2 with E. coli significantly increased after the addition of Paramecium into the microcosm. This interaction favoured the hetero-agglomeration and co-sedimentation of nTiO2. The extent of nTiO2 agglomeration under experimental conditions was as follows: combined E. coli and Paramecium > Paramecium only > E. coli only > without E. coli or Paramecium. An increase in nTiO2 internalisation in Paramecium cells was also observed in the presence or absence of E. coli cells. These interactions and nTiO2 internalisation in Paramecium cells induced statistically significant (p < 0.05) effects on growth and the bacterial ingestion rate at 24 h. These findings provide new insights into the fate of nTiO2 in the presence of bacterial-ciliate interactions in the aquatic environment.
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Zhiyuan L, Shuili Y, Heedeung P, Qingbin Y, Guicai L, Qi L. Impact of titanium dioxide nanoparticles on the bacterial communities of biological activated carbon filter intended for drinking water treatment. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2016; 23:15574-15583. [PMID: 27126871 DOI: 10.1007/s11356-016-6742-x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/29/2015] [Accepted: 04/22/2016] [Indexed: 06/05/2023]
Abstract
Titanium dioxide nanoparticles (TiO2 NPs) are inevitably present in the aquatic environment owing to their increasing production and use. However, knowledge of the potential effects of TiO2 NPs on the treatment of drinking water is scarce. Herein, the effects of two types of anatase TiO2 NPs (TP1, 25 nm; TP2, 100 nm) on the bacterial community in a biological activated carbon (BAC) filter were investigated via quantitative polymerase chain reaction (Q-PCR) analysis, ATP quantification, and 454 pyrosequencing analysis. Both TP1 and TP2 significantly inhibited the bacterial ATP level (p < 0.01) and induced a decrease in the abundance of bacterial 16S rDNA gene copies at doses of 0.1 and 100 mg L(-1). Simultaneously, the diversity and evenness of the bacterial communities were considerably reduced. The relative abundances of bacteria annotated to OTUs from Nitrospira class and Betaproteobacteria class decreased upon TiO2 NP treatment, whereas those of Bacilli class and Gammaproteobacteria class increased. TiO2 NP size showed a greater effect on the bacterial composition than did the dose based on Bray-Curtis distances. These findings identified negative effects of TiO2 NPs on the bacterial community in the BAC filter. Given the fact that BAC filters are used widely in drinking water treatment plants, these results suggested a potential threat by TiO2 NP to drinking water treatment system.
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Affiliation(s)
- Liu Zhiyuan
- State Key Laboratory of Pollution Control and Resources Reuse, Tongji University, Shanghai, 200092, China
| | - Yu Shuili
- State Key Laboratory of Pollution Control and Resources Reuse, Tongji University, Shanghai, 200092, China.
- College of Environmental Science and Engineering, Tongji University, Shanghai, 200092, China.
| | - Park Heedeung
- School of Civil, Environmental and Architectural Engineering, Korea University, Seoul, 136-714, South Korea
| | - Yuan Qingbin
- State Key Laboratory of Pollution Control and Resources Reuse, Tongji University, Shanghai, 200092, China
| | - Liu Guicai
- State Key Laboratory of Pollution Control and Resources Reuse, Tongji University, Shanghai, 200092, China
| | - Li Qi
- State Key Laboratory of Pollution Control and Resources Reuse, Tongji University, Shanghai, 200092, China
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41
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Patchaiyappan A, Saran S, Devipriya SP. Recovery and reuse of TiO2 photocatalyst from aqueous suspension using plant based coagulant - A green approach. KOREAN J CHEM ENG 2016. [DOI: 10.1007/s11814-016-0059-9] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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42
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Wang L, Liu JH, Song ZM, Yang YX, Cao A, Liu Y, Wang H. Interaction of multi-walled carbon nanotubes and zinc ions enhances cytotoxicity of zinc ions. Sci China Chem 2016. [DOI: 10.1007/s11426-016-5591-2] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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43
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Zhukova LV. Evidence for Compression of Escherichia coli K12 Cells under the Effect of TiO₂ Nanoparticles. ACS APPLIED MATERIALS & INTERFACES 2015; 7:27197-27205. [PMID: 26584239 DOI: 10.1021/acsami.5b08042] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
It has been shown that treatment with titanium dioxide nanoparticles (TiO2 NPs) combined with near-ultraviolet (UV-A) irradiation or in certain dark conditions reduced the numbers of various microorganisms, but the mechanism of this effect remains unclear. In this study to further clarify the mechanism of the antibacterial effect of TiO2 NPs the physiological state of E. coli K12 cells was estimated after incubation with the NPs (0.2 g/L) for different periods of time, with or without UV-A irradiation. Cell incubation with TiO2 NPs, combined or not combined with UV-A irradiation, showed that inactive cells were located only within cell aggregates formed after incubation with TiO2 NPs and that the larger the aggregate, the greater the number of such cells. When the formation of large aggregates was prevented, exposure to NPs under UV-A irradiation failed to result in cell inactivation. A comparative analysis of fluorescence and optical microscopic images of the same aggregates showed that the location of inactivated cells coincided with the zone of increased optical density within the aggregate. After treatment with TiO2 NPs under UV-A for 30, 60, or 120 min cells within the aggregates were the first to be inactivated. Cells on which NPs irradiated more strongly (at the periphery of large aggregates and single) remained active for a longer time than cells within the aggregates. As the time of treatment increased, so did the degree of cell compaction, with some zones of the aggregates eventually transforming into an acellular mass. After UV-A irradiation the cell aggregates spontaneously moved toward each other and gradually fused into larger structures, indicating that such exposure enhanced mutual attraction of cells treated with the NPs. Present study provides evidence for hypothesis that bacterial cells covered with TiO2 NPs are inactivated due to their mutual attraction and consequent compression.
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Affiliation(s)
- Lyudmila V Zhukova
- Bach Institute of Biochemistry, Research Center of Biotechnology of the Russian Academy of Sciences , 33, Building 2 Leninsky Avenue, Moscow 119071, Russia
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44
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Erdem A, Metzler D, Cha DK, Huang CP. The short-term toxic effects of TiO₂nanoparticles toward bacteria through viability, cellular respiration, and lipid peroxidation. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2015; 22:17917-17924. [PMID: 26165996 DOI: 10.1007/s11356-015-5018-1] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/28/2015] [Accepted: 07/01/2015] [Indexed: 06/04/2023]
Abstract
To better understand the potential impacts of metal oxide nanoparticles (NPs) on Gram(+) Bacillus subtilis and Gram(-) Escherichia coli (K12) bacteria, eight different nanosized titanium dioxide (TiO2) suspensions with five different concentrations were used. Water quality parameters (pH, temperature, and ionic strength), light sources, and light intensities were also changed to achieve different environmental conditions. The photosensitive TiO2 NPs were found to be harmful to varying degrees under ambient conditions, with antibacterial activity increasing with primary particle sizes from 16 to 20 nm. The presence of light was a significant factor under most conditions tested, presumably due to its role in promoting generation of reactive oxygen species (ROS). However, bacterial growth inhibition was also observed under dark conditions and different water quality parameters, indicating that undetermined mechanisms additional to photocatalytic ROS production were responsible for toxicity. The results also indicated that nano-TiO2 particles in the absence and the presence of photoactivation induced lipid peroxidation and cellular respiration disruption.
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Affiliation(s)
- Ayca Erdem
- Department of Environmental Engineering, Akdeniz University, Antalya, 07058, Turkey.
- Department of Civil and Environmental Engineering, University of Delaware, Newark, DE, 19716, USA.
| | - David Metzler
- Department of Civil and Environmental Engineering, University of Delaware, Newark, DE, 19716, USA
| | - Daniel K Cha
- Department of Civil and Environmental Engineering, University of Delaware, Newark, DE, 19716, USA
| | - C P Huang
- Department of Civil and Environmental Engineering, University of Delaware, Newark, DE, 19716, USA
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45
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Venkatesan PN, Dharmalingam S. Effect of cation transport of SPEEK – Rutile TiO2 electrolyte on microbial fuel cell performance. J Memb Sci 2015. [DOI: 10.1016/j.memsci.2015.06.025] [Citation(s) in RCA: 49] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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46
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Potential role of engineered nanoparticles as contaminant carriers in aquatic ecosystems: Estimating sorption processes of the cyanobacterial toxin microcystin-LR by TiO2 nanoparticles. Colloids Surf A Physicochem Eng Asp 2015. [DOI: 10.1016/j.colsurfa.2015.06.013] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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47
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Jomini S, Clivot H, Bauda P, Pagnout C. Impact of manufactured TiO2 nanoparticles on planktonic and sessile bacterial communities. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2015; 202:196-204. [PMID: 25839943 DOI: 10.1016/j.envpol.2015.03.022] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/18/2014] [Revised: 03/09/2015] [Accepted: 03/17/2015] [Indexed: 05/27/2023]
Abstract
In the present study, we conducted a 2 week microcosm experiment with a natural freshwater bacterial community to assess the effects of titanium dioxide nanoparticles (TiO2-NPs) at various concentrations (0, 1, 10 and 100 mg/L) on planktonic and sessile bacteria under dark conditions. Results showed an increase of planktonic bacterial abundance at the highest TiO2-NP concentration, concomitant with a decrease from that of sessile bacteria. Bacterial assemblages were most affected by the 100 mg/L TiO2-NP exposure and overall diversity was found to be lower for planktonic bacteria and higher for sessile bacteria at this concentration. In both compartments, a 100 mg/L TiO2-NPs exposure induced a decrease in the ratio between the Betaproteobacteria and Bacteroidetes. For planktonic communities, a decrease of Comamonadaceae was observed concomitant with an increase of Oxalobacteraceae and Cytophagaceae (especially Emticicia). For sessile communities, results showed a strong decrease of Betaproteobacteria and particularly of Comamonadaceae.
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Affiliation(s)
- Stéphane Jomini
- Université de Lorraine, Laboratoire Interdisciplinaire des Environnements Continentaux (LIEC), rue du Général Delestraint, F-57070 Metz, France; CNRS UMR 7360, Laboratoire Interdisciplinaire des Environnements Continentaux (LIEC), rue du Général Delestraint, F-57070 Metz, France
| | - Hugues Clivot
- Université de Lorraine, Laboratoire Interdisciplinaire des Environnements Continentaux (LIEC), rue du Général Delestraint, F-57070 Metz, France; CNRS UMR 7360, Laboratoire Interdisciplinaire des Environnements Continentaux (LIEC), rue du Général Delestraint, F-57070 Metz, France
| | - Pascale Bauda
- Université de Lorraine, Laboratoire Interdisciplinaire des Environnements Continentaux (LIEC), rue du Général Delestraint, F-57070 Metz, France; CNRS UMR 7360, Laboratoire Interdisciplinaire des Environnements Continentaux (LIEC), rue du Général Delestraint, F-57070 Metz, France; International Consortium for the Environmental Implications of Nanotechnology (iCEINT), Europole de l'Arbois, F-13545 Aix en Provence, France
| | - Christophe Pagnout
- Université de Lorraine, Laboratoire Interdisciplinaire des Environnements Continentaux (LIEC), rue du Général Delestraint, F-57070 Metz, France; CNRS UMR 7360, Laboratoire Interdisciplinaire des Environnements Continentaux (LIEC), rue du Général Delestraint, F-57070 Metz, France; International Consortium for the Environmental Implications of Nanotechnology (iCEINT), Europole de l'Arbois, F-13545 Aix en Provence, France.
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48
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Sousa C, Sequeira D, Kolen'ko YV, Pinto IM, Petrovykh DY. Analytical protocols for separation and electron microscopy of nanoparticles interacting with bacterial cells. Anal Chem 2015; 87:4641-8. [PMID: 25764323 DOI: 10.1021/ac503835a] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
An important step toward understanding interactions between nanoparticles (NPs) and bacteria is the ability to directly observe NPs interacting with bacterial cells. NP-bacteria mixtures typical in nanomedicine, however, are not yet amendable for direct imaging in solution. Instead, evidence of NP-cell interactions must be preserved in derivative (usually dried) samples to be subsequently revealed in high-resolution images, for example, via scanning electron microscopy (SEM). Here, this concept is realized for a mixed suspension of model NPs and Staphylococcus aureus bacteria. First, protocols for analyzing the relative colloidal stabilities of NPs and bacteria are developed and validated based on systematic centrifugation and comparison of colony forming unit (CFU) counting and optical density (OD) measurements. Rate-dependence of centrifugation efficiency for each component suggests differential sedimentation at a specific predicted rate as an effective method for removing free NPs after co-incubation; the remaining fraction comprises bacteria with any associated NPs and can be examined, for example, by SEM, for evidence of NP-bacteria interactions. These analytical protocols, validated by systematic control experiments and high-resolution SEM imaging, should be generally applicable for investigating NP-bacteria interactions.
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Affiliation(s)
- Cláudia Sousa
- †Center of Biological Engineering, University of Minho, Braga 4710-057, Portugal
| | - Diana Sequeira
- †Center of Biological Engineering, University of Minho, Braga 4710-057, Portugal
| | - Yury V Kolen'ko
- ‡International Iberian Nanotechnology Laboratory, Braga 4715-330, Portugal
| | - Inês Mendes Pinto
- ‡International Iberian Nanotechnology Laboratory, Braga 4715-330, Portugal
| | - Dmitri Y Petrovykh
- ‡International Iberian Nanotechnology Laboratory, Braga 4715-330, Portugal
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49
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Djurišić AB, Leung YH, Ng AMC, Xu XY, Lee PKH, Degger N, Wu RSS. Toxicity of metal oxide nanoparticles: mechanisms, characterization, and avoiding experimental artefacts. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2015; 11:26-44. [PMID: 25303765 DOI: 10.1002/smll.201303947] [Citation(s) in RCA: 204] [Impact Index Per Article: 22.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/30/2013] [Revised: 08/20/2014] [Indexed: 05/22/2023]
Abstract
Metal oxide nanomaterials are widely used in practical applications and represent a class of nanomaterials with the highest global annual production. Many of those, such as TiO2 and ZnO, are generally considered non-toxic due to the lack of toxicity of the bulk material. However, these materials typically exhibit toxicity to bacteria and fungi, and there have been emerging concerns about their ecotoxicity effects. The understanding of the toxicity mechanisms is incomplete, with different studies often reporting contradictory results. The relationship between the material properties and toxicity appears to be complex and diifficult to understand, which is partly due to incomplete characterization of the nanomaterial, and possibly due to experimental artefacts in the characterization of the nanomaterial and/or its interactions with living organisms. This review discusses the comprehensive characterization of metal oxide nanomaterials and the mechanisms of their toxicity.
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50
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Mohammed AA, Haris SM, Nuawi MZ. Using the pressure transmission coefficient of a transmitted wave to evaluate some of the mechanical properties of refractory metals. ULTRASONICS 2015; 55:133-140. [PMID: 25096851 DOI: 10.1016/j.ultras.2014.07.001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/10/2013] [Revised: 06/30/2014] [Accepted: 07/01/2014] [Indexed: 06/03/2023]
Abstract
Refractory metals have attracted increasing interest in recent years because of their use in many high-temperature applications. However, the characteristics of these metals calculated using loaded tests (such as tensile strength tests) differ considerably from those calculated using one of the most famous methods in NDT which is called time of flying of the wave (TOF).The present study presents two solutions based on calculating the pressure transmission coefficient (PTC) of the transmitted wave between the test sample and magnesium metal. The first is based on the development of a highly accurate algorithm that lowers the cost by determining the acoustic impedance of the test specimen to calculating mechanical properties. Up to 26 theoretical tests were done (10 of these tests for refractory materials) according to their known mechanical properties to verify the accuracy of the algorithm. The convergence in results ranged from 92% to 99%. The second solution was designed to solve the same problem for specimens with a thickness of less than 1mm. Eight experimental tests were done (five using refractory materials) to verify the accuracy of the second solution, with the convergence in the results ranging from 94% to 97%. The relationships of the Vrms measured from the oscilloscope with the PTC and with the Fourier transform spectrum were derived. The results of this research were closer to the standard mechanical properties for refractory metals compared with several recent acoustic tests.
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Affiliation(s)
- Arshed Abdulhamed Mohammed
- Electronic Department, College of Engineering, Diyala University, Iraq; Department of Mechanical and Materials Engineering, Faculty of Engineering and Built Environment, University Kebangsaan Malaysia, UKM, 43600 UKM Bangi, Selangor Darul Ehsan, Malaysia.
| | - Sallehuddin Mohamed Haris
- Department of Mechanical and Materials Engineering, Faculty of Engineering and Built Environment, University Kebangsaan Malaysia, UKM, 43600 UKM Bangi, Selangor Darul Ehsan, Malaysia
| | - Mohd Zaki Nuawi
- Department of Mechanical and Materials Engineering, Faculty of Engineering and Built Environment, University Kebangsaan Malaysia, UKM, 43600 UKM Bangi, Selangor Darul Ehsan, Malaysia
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