51
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Nanomaterial Impact, Toxicity and Regulation in Agriculture, Food and Environment. SUSTAINABLE AGRICULTURE REVIEWS 2017. [DOI: 10.1007/978-3-319-58496-6_8] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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52
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Liang Y, Yang D, Cui J. A graphene oxide/silver nanoparticle composite as a novel agricultural antibacterial agent against Xanthomonas oryzae pv. oryzae for crop disease management. NEW J CHEM 2017. [DOI: 10.1039/c7nj02942j] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A graphene oxide/silver nanoparticle composite has great potential as a novel agricultural bactericide.
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Affiliation(s)
- You Liang
- College of Agriculture
- Shihezi University
- Shihezi 832000
- P. R. China
| | - Desong Yang
- College of Agriculture
- Shihezi University
- Shihezi 832000
- P. R. China
| | - Jianghu Cui
- Guangdong Key Laboratory of Integrated Agro-environmental Pollution Control and Management
- Guangdong Institute of Eco-environmental Science & Technology
- Guangzhou 510650
- P. R. China
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53
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Ji H, Sun H, Qu X. Antibacterial applications of graphene-based nanomaterials: Recent achievements and challenges. Adv Drug Deliv Rev 2016; 105:176-189. [PMID: 27129441 DOI: 10.1016/j.addr.2016.04.009] [Citation(s) in RCA: 253] [Impact Index Per Article: 31.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2015] [Revised: 04/05/2016] [Accepted: 04/10/2016] [Indexed: 12/19/2022]
Abstract
Graphene has emerged as a novel green broad-spectrum antibacterial material, with little bacterial resistance and tolerable cytotoxic effect on mammalian cells. It exerts its antibacterial action via physical damages such as direct contact of its sharp edges with bacterial membranes and destructive extraction of lipid molecules. These damages also include wrapping and photothermal ablation mechanisms. Alternatively, chemical damage of bacteria is caused by oxidative stress with the generation of reactive oxygen species and charge transfer. Furthermore, graphene has been used as a support to disperse and stabilize various nanomaterials, such as metals, metal oxides, and polymers, with high antibacterial efficiency due to the synergistic effect. In addition, graphene-based antibiotic drug delivery platforms have been constructed. Due to the superior antibacterial properties and good biocompatibility, graphene-based nanocomposites have a wide range of applications, such as antibacterial packaging, wound dressing, and water disinfection. In this review, we highlight the antibacterial mechanism of graphene and summarize recent advances related to the antibacterial activity of graphene-based materials. Many of the recent application examples are further discussed. We hope that this review provides valuable insight, stimulates broader concerns, and spurs further developments in this promising field.
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Shi L, Chen J, Teng L, Wang L, Zhu G, Liu S, Luo Z, Shi X, Wang Y, Ren L. The Antibacterial Applications of Graphene and Its Derivatives. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2016; 12:4165-84. [PMID: 27389848 DOI: 10.1002/smll.201601841] [Citation(s) in RCA: 119] [Impact Index Per Article: 14.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/01/2016] [Revised: 06/11/2016] [Indexed: 05/20/2023]
Abstract
Graphene materials have unique structures and outstanding thermal, optical, mechanical and electronic properties. In the last decade, these materials have attracted substantial interest in the field of nanomaterials, with applications ranging from biosensors to biomedicine. Among these applications, great advances have been made in the field of antibacterial agents. Here, recent advancements in the use of graphene and its derivatives as antibacterial agents are reviewed. Graphene is used in three forms: the pristine form; mixed with other antibacterial agents, such as Ag and chitosan; or with a base material, such as poly (N-vinylcarbazole) (PVK) and poly (lactic acid) (PLA). The main mechanisms proposed to explain the antibacterial behaviors of graphene and its derivatives are the membrane stress hypothesis, the oxidative stress hypothesis, the entrapment hypothesis, the electron transfer hypothesis and the photothermal hypothesis. This review describes contributions to improving these promising materials for antibacterial applications.
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Affiliation(s)
- Lin Shi
- National Engineering Research Center for Tissue Restoration and Reconstruction, South China University of Technology, Guangzhou, 510006, PR China
- School of Materials Science and Engineering, South China University of Technology, Guangzhou, 510640, PR China
| | - Jiongrun Chen
- National Engineering Research Center for Tissue Restoration and Reconstruction, South China University of Technology, Guangzhou, 510006, PR China
- School of Materials Science and Engineering, South China University of Technology, Guangzhou, 510640, PR China
| | - Lijing Teng
- National Engineering Research Center for Tissue Restoration and Reconstruction, South China University of Technology, Guangzhou, 510006, PR China
- School of Materials Science and Engineering, South China University of Technology, Guangzhou, 510640, PR China
| | - Lin Wang
- National Engineering Research Center for Tissue Restoration and Reconstruction, South China University of Technology, Guangzhou, 510006, PR China
- School of Materials Science and Engineering, South China University of Technology, Guangzhou, 510640, PR China
| | - Guanglin Zhu
- National Engineering Research Center for Tissue Restoration and Reconstruction, South China University of Technology, Guangzhou, 510006, PR China
- School of Materials Science and Engineering, South China University of Technology, Guangzhou, 510640, PR China
| | - Sa Liu
- National Engineering Research Center for Tissue Restoration and Reconstruction, South China University of Technology, Guangzhou, 510006, PR China
- School of Materials Science and Engineering, South China University of Technology, Guangzhou, 510640, PR China
| | - Zhengtang Luo
- Department of Chemical and Biomolecular Engineering, The Hong Kong University of Science and Technology, Hong Kong, 999077, PR China
| | - Xuetao Shi
- National Engineering Research Center for Tissue Restoration and Reconstruction, South China University of Technology, Guangzhou, 510006, PR China
- School of Materials Science and Engineering, South China University of Technology, Guangzhou, 510640, PR China
| | - Yingjun Wang
- National Engineering Research Center for Tissue Restoration and Reconstruction, South China University of Technology, Guangzhou, 510006, PR China
- School of Materials Science and Engineering, South China University of Technology, Guangzhou, 510640, PR China
| | - Li Ren
- National Engineering Research Center for Tissue Restoration and Reconstruction, South China University of Technology, Guangzhou, 510006, PR China
- School of Materials Science and Engineering, South China University of Technology, Guangzhou, 510640, PR China
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55
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Li S, Yu Y, Chen J, Guo B, Yang L, Ding W. Evaluation of the Antibacterial Effects and Mechanism of Action of Protocatechualdehyde against Ralstonia solanacearum. Molecules 2016; 21:E754. [PMID: 27294898 PMCID: PMC6274444 DOI: 10.3390/molecules21060754] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2016] [Revised: 06/05/2016] [Accepted: 06/07/2016] [Indexed: 12/21/2022] Open
Abstract
Protocatechualdehyde (PCA) is an important plant-derived natural product that has been associated with a wide variety of biological activities and has been widely used in medicine as an antioxidant, anti-aging and an anti-inflammatory agent. However, fewer reports concerning its antibacterial effects on plant-pathogenic bacteria exist. Therefore, in this study, protocatechualdehyde was evaluated for its antibacterial activity against plant pathogens along with the mechanism of its antibacterial action. PCA at 40 μg/mL was highly active against R. solanacearum and significantly inhibited its growth. The minimum bactericidal concentration and minimum inhibitory concentration values for PCA were 40 μg/mL and 20 μg/mL, respectively. Further investigation of the mechanism of action of PCA via transmission electron microscopy and biological assays indicated that the destruction of the cell structure, the shapes and the inhibition of biofilm formation were important. In addition, the application of PCA effectively reduced the incidence of bacterial wilt on tobacco under greenhouse conditions, and the control efficiency was as high as 92.01% at nine days after inoculation. Taken together, these findings suggest that PCA exhibits strong antibacterial activity against R. solanacearum and has the potential to be applied as an effective antibacterial agent for controlling bacterial wilt caused by R. solanacearum.
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Affiliation(s)
- Shili Li
- Laboratory of Natural Products Pesticides, College of Plant Protection, Southwest University, Chongqing 400715, China.
| | - Yanmei Yu
- Laboratory of Natural Products Pesticides, College of Plant Protection, Southwest University, Chongqing 400715, China.
| | - Juanni Chen
- Laboratory of Natural Products Pesticides, College of Plant Protection, Southwest University, Chongqing 400715, China.
| | - Bing Guo
- Laboratory of Natural Products Pesticides, College of Plant Protection, Southwest University, Chongqing 400715, China.
| | - Liang Yang
- Laboratory of Natural Products Pesticides, College of Plant Protection, Southwest University, Chongqing 400715, China.
| | - Wei Ding
- Laboratory of Natural Products Pesticides, College of Plant Protection, Southwest University, Chongqing 400715, China.
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56
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Application of magneto‐responsive Oenococcus oeni for the malolactic fermentation in wine. Biochem Eng J 2016. [DOI: 10.1016/j.bej.2016.02.016] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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57
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Yang L, Ding W, Xu Y, Wu D, Li S, Chen J, Guo B. New Insights into the Antibacterial Activity of Hydroxycoumarins against Ralstonia solanacearum. Molecules 2016; 21:468. [PMID: 27070570 PMCID: PMC6273506 DOI: 10.3390/molecules21040468] [Citation(s) in RCA: 88] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2016] [Revised: 04/01/2016] [Accepted: 04/05/2016] [Indexed: 11/17/2022] Open
Abstract
Coumarins are important plant-derived natural products with wide-ranging bioactivities and extensive applications. In this study, we evaluated for the first time the antibacterial activity and mechanisms of action of coumarins against the phytopathogen Ralstonia solanacearum, and investigated the effect of functional group substitution. We first tested the antibacterial activity of 18 plant-derived coumarins with different substitution patterns, and found that daphnetin, esculetin, xanthotol, and umbelliferone significantly inhibited the growth of R. solanacearum. Daphnetin showed the strongest antibacterial activity, followed by esculetin and umbelliferone, with MICs of 64, 192, and 256 mg/L, respectively, better than the archetypal coumarin with 384 mg/L. We further demonstrated that the hydroxylation of coumarins at the C-6, C-7 or C-8 position significantly enhanced the antibacterial activity against R. solanacearum. Transmission electron microscope (TEM) and fluorescence microscopy images showed that hydroxycoumarins may interact with the pathogen by mechanically destroying the cell membrane and inhibiting biofilm formation. The antibiofilm effect of hydroxycoumarins may relate to the repression of flagellar genes fliA and flhC. These physiological changes in R. solanacearum caused by hydroxycoumarins can provide information for integral pathogen control. The present findings demonstrated that hydroxycoumarins have superior antibacterial activity against the phytopathogen R. solanacearum, and thus have the potential to be applied for controlling plant bacterial wilt.
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Affiliation(s)
- Liang Yang
- Laboratory of Natural Products Pesticides, College of Plant Protection, Southwest University, Chongqing 400715, China.
| | - Wei Ding
- Laboratory of Natural Products Pesticides, College of Plant Protection, Southwest University, Chongqing 400715, China.
| | - Yuquan Xu
- Biotechnology Research Institute, The Chinese Academy of Agricultural Sciences, Beijing 100081, China.
| | - Dousheng Wu
- Laboratory of Natural Products Pesticides, College of Plant Protection, Southwest University, Chongqing 400715, China.
| | - Shili Li
- Laboratory of Natural Products Pesticides, College of Plant Protection, Southwest University, Chongqing 400715, China.
| | - Juanni Chen
- Laboratory of Natural Products Pesticides, College of Plant Protection, Southwest University, Chongqing 400715, China.
| | - Bing Guo
- Laboratory of Natural Products Pesticides, College of Plant Protection, Southwest University, Chongqing 400715, China.
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58
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Zou X, Zhang L, Wang Z, Luo Y. Mechanisms of the Antimicrobial Activities of Graphene Materials. J Am Chem Soc 2016; 138:2064-77. [PMID: 26824139 DOI: 10.1021/jacs.5b11411] [Citation(s) in RCA: 477] [Impact Index Per Article: 59.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
A thorough understanding of the antimicrobial mechanisms of graphene materials (GMs) is critical to the manipulation of highly efficient antimicrobial nanomaterials for future biomedical applications. Here we review the most recent studies of GM-mediated antimicrobial properties. This review covers the physicochemical properties of GMs, experimental surroundings, and selected microorganisms as well as the interaction between GMs and selected microorganisms to explore controversial antimicrobial activities. Finally, we rationally analyze the strengths and weaknesses of the proposed mechanisms and provide new insights into the remaining challenges and perspectives for future studies.
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Affiliation(s)
- Xuefeng Zou
- Medical Research Center, Southwest Hospital, Third Military Medical University , Chongqing 400038, China
| | - Li Zhang
- Medical Research Center, Southwest Hospital, Third Military Medical University , Chongqing 400038, China
| | - Zhaojun Wang
- Medical Research Center, Southwest Hospital, Third Military Medical University , Chongqing 400038, China
| | - Yang Luo
- Medical Research Center, Southwest Hospital, Third Military Medical University , Chongqing 400038, China
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59
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Bai Y, Wang C, Gao J, Su J, Ma W. A Study on Dispersion and Antibacterial Activity of Functionalizing Multi-walled Carbon Nanotubes with Mixed Surfactant. J SURFACTANTS DETERG 2015. [DOI: 10.1007/s11743-015-1729-z] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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60
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Dharni S, Sanchita, Unni SM, Kurungot S, Samad A, Sharma A, Patra DD. In vitro and in silico antifungal efficacy of nitrogen-doped carbon nanohorn (NCNH) against Rhizoctonia solani. J Biomol Struct Dyn 2015; 34:152-62. [PMID: 25932774 DOI: 10.1080/07391102.2015.1018841] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
We have investigated in vitro antifungal efficiency of nitrogen-doped carbon nanohorn (NCNH) against Rhizoctonia solani (R. solani) plant pathogenic fungi. NCNH with size of 50-60 nm and concentrations of 10, 50, 100, and 150 μg mL(-1) were used. The results showed that growth of fungi in the presence of NCNH was significantly (p > .05) inhibited at 150 μg mL(-1) (85.13 ± .97) after 72 h. The results were validated through computational approaches. Molecular docking analysis of NCNH with endochitinase protein of R. solani was performed to validate the potential of antifungal activity of NCNH. Docking results showed different conformations of interaction of NCNH with endochitinase enzyme. The conformation with least binding energy -13.54 kcal/mol was considered further. It is likely that NCNH interacts with the pathogens by mechanically wrapping, which may be one of the major toxicity actions of NCNH against R. solani. The analysis showed that NCNH might interwinds to endochitinase of R. solani leading to the deactivation of the enzyme. To best of our knowledge, this is the first report of antifungal efficacy of NCNH against R. solani and provides useful information about the application of NCNH in resisting crop disease.
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Affiliation(s)
- Seema Dharni
- a Agronomy and Soil Science Division , CSIR-CIMAP , Lucknow 226015 , India
| | - Sanchita
- b Biotechnology Division , CSIR-CIMAP , Lucknow 226015 , India
| | - SreeKuttan M Unni
- c Physical and Material Chemistry Division , CSIR-National Chemistry Laboratory , Pune 223456 , India
| | - Sreekumar Kurungot
- c Physical and Material Chemistry Division , CSIR-National Chemistry Laboratory , Pune 223456 , India
| | - Abdul Samad
- d Crop Protection Division , CSIR-CIMAP , Lucknow 226015 , India
| | - Ashok Sharma
- b Biotechnology Division , CSIR-CIMAP , Lucknow 226015 , India
| | - Dharani Dhar Patra
- a Agronomy and Soil Science Division , CSIR-CIMAP , Lucknow 226015 , India
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61
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Navale GR, Rout CS, Gohil KN, Dharne MS, Late DJ, Shinde SS. Oxidative and membrane stress-mediated antibacterial activity of WS2and rGO-WS2nanosheets. RSC Adv 2015. [DOI: 10.1039/c5ra15652a] [Citation(s) in RCA: 56] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
We examined the antibacterial activities of nanosheets of the graphene analogue tungsten disulphide (WS2) and a composite of reduced graphene oxide-tungsten disulphide (rGO-WS2).
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Affiliation(s)
- Govinda R. Navale
- Organic Chemistry Division
- CSIR-National Chemical Laboratory
- Pune 411008
- India
| | - Chandra Sekhar Rout
- School of Basic Sciences
- Indian Institute of Technology Bhubaneswar
- Bhubaneswar 751013
- India
| | - Kushal N. Gohil
- NCIM Resource Centre
- CSIR-National Chemical Laboratory
- Pune 411008
- India
| | - Mahesh S. Dharne
- NCIM Resource Centre
- CSIR-National Chemical Laboratory
- Pune 411008
- India
| | - Dattatray J. Late
- Physical & Materials Chemistry Division
- CSIR-National Chemical Laboratory
- Pune 411008
- India
| | - Sandip S. Shinde
- Organic Chemistry Division
- CSIR-National Chemical Laboratory
- Pune 411008
- India
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62
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Barbinta-Patrascu ME, Ungureanu C, Iordache SM, Iordache AM, Bunghez IR, Ghiurea M, Badea N, Fierascu RC, Stamatin I. Eco-designed biohybrids based on liposomes, mint–nanosilver and carbon nanotubes for antioxidant and antimicrobial coating. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2014; 39:177-85. [DOI: 10.1016/j.msec.2014.02.038] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/07/2013] [Revised: 02/02/2014] [Accepted: 02/17/2014] [Indexed: 10/25/2022]
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63
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Yao J, Yang M, Duan Y. Chemistry, Biology, and Medicine of Fluorescent Nanomaterials and Related Systems: New Insights into Biosensing, Bioimaging, Genomics, Diagnostics, and Therapy. Chem Rev 2014; 114:6130-78. [DOI: 10.1021/cr200359p] [Citation(s) in RCA: 592] [Impact Index Per Article: 59.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Jun Yao
- Research
Center of Analytical Instrumentation, Analytical and Testing Center,
College of Chemistry, Sichuan University, Chengdu, Sichuan 610064, China
| | - Mei Yang
- Research
Center of Analytical Instrumentation, Analytical and Testing Center,
College of Chemistry, Sichuan University, Chengdu, Sichuan 610064, China
| | - Yixiang Duan
- Research
Center of Analytical Instrumentation, Analytical and Testing Center,
College of Chemistry, Sichuan University, Chengdu, Sichuan 610064, China
- Research
Center of Analytical Instrumentation, College of Life Sciences, Sichuan University, Chengdu, Sichuan 610064, China
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64
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Chouhan RS, Qureshi A, Niazi JH. Quantum dot conjugated S. cerevisiae as smart nanotoxicity indicators for screening the toxicity of nanomaterials. J Mater Chem B 2014; 2:3618-3625. [DOI: 10.1039/c4tb00495g] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Quantum dot conjugatedS. cerevisiaeas smart nanotoxicity indicators for screening the toxicity of nanomaterials.
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Affiliation(s)
- Raghuraj S. Chouhan
- Sabanci University Nanotechnology Research and Application Center
- 34956 Istanbul, Turkey
| | - Anjum Qureshi
- Sabanci University Nanotechnology Research and Application Center
- 34956 Istanbul, Turkey
| | - Javed H. Niazi
- Sabanci University Nanotechnology Research and Application Center
- 34956 Istanbul, Turkey
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65
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Chen J, Peng H, Wang X, Shao F, Yuan Z, Han H. Graphene oxide exhibits broad-spectrum antimicrobial activity against bacterial phytopathogens and fungal conidia by intertwining and membrane perturbation. NANOSCALE 2014; 6:1879-89. [PMID: 24362636 DOI: 10.1039/c3nr04941h] [Citation(s) in RCA: 316] [Impact Index Per Article: 31.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
To understand the interaction mechanism between graphene oxide (GO) and typical phytopathogens, a particular investigation was conducted about the antimicrobial activity of GO against two bacterial pathogens (P. syringae and X. campestris pv. undulosa) and two fungal pathogens (F. graminearum and F. oxysporum). The results showed that GO had a powerful effect on the reproduction of all four pathogens (killed nearly 90% of the bacteria and repressed 80% macroconidia germination along with partial cell swelling and lysis at 500 μg mL(-1)). A mutual mechanism is proposed in this work that GO intertwinds the bacteria and fungal spores with a wide range of aggregated graphene oxide sheets, resulting in the local perturbation of their cell membrane and inducing the decrease of the bacterial membrane potential and the leakage of electrolytes of fungal spores. It is likely that GO interacts with the pathogens by mechanically wrapping and locally damaging the cell membrane and finally causing cell lysis, which may be one of the major toxicity actions of GO against phytopathogens. The antibacterial mode proposed in this study suggests that the GO may possess antibacterial activity against more multi-resistant bacterial and fungal phytopathogens, and provides useful information about the application of GO in resisting crop diseases.
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Affiliation(s)
- Juanni Chen
- State Key Laboratory of Agricultural Microbiology, College of Science, Huazhong Agricultural University, Wuhan, 430070, P.R. China.
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66
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Dong A, Xue M, Lan S, Wang Q, Zhao Y, Wang Y, Zhang Y, Gao G, Liu F, Harnoode C. Bactericidal evaluation of N-halamine-functionalized silica nanoparticles based on barbituric acid. Colloids Surf B Biointerfaces 2014; 113:450-7. [DOI: 10.1016/j.colsurfb.2013.09.048] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2013] [Revised: 09/03/2013] [Accepted: 09/24/2013] [Indexed: 12/22/2022]
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67
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Olivi M, Zanni E, De Bellis G, Talora C, Sarto MS, Palleschi C, Flahaut E, Monthioux M, Rapino S, Uccelletti D, Fiorito S. Inhibition of microbial growth by carbon nanotube networks. NANOSCALE 2013; 5:9023-9029. [PMID: 23934344 DOI: 10.1039/c3nr02091f] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
In the last years carbon nanotubes have attracted increasing attention for their potential applications in the biomedical field as diagnostic and therapeutic nano tools. Here we investigate the antimicrobial activity of different fully characterized carbon nanotube types (single walled, double walled and multi walled) on representative pathogen species: Gram-positive Staphylococcus aureus, Gram-negative Pseudomonas aeruginosa and the opportunistic fungus Candida albicans. Our results show that all the carbon nanotube types possess a highly significant antimicrobial capacity, even though they have a colony forming unit capacity and induction of oxidative stress in all the microbial species to a different extent. Moreover, scanning electron microscopy analysis revealed that the microbial cells were wrapped or entrapped by carbon nanotube networks. Our data taken together suggest that the reduced capacity of microbial cells to forming colonies and their oxidative response could be related to the cellular stress induced by the interactions of pathogens with the CNT network.
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Affiliation(s)
- Massimiliano Olivi
- Dept. Biology and Biotechnology, Sapienza-University of Rome, Rome, Italy.
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68
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Li J, Liu X, Qiao Y, Zhu H, Ding C. Antimicrobial activity and cytocompatibility of Ag plasma-modified hierarchical TiO2 film on titanium surface. Colloids Surf B Biointerfaces 2013; 113:134-45. [PMID: 24077111 DOI: 10.1016/j.colsurfb.2013.08.030] [Citation(s) in RCA: 64] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2013] [Revised: 08/06/2013] [Accepted: 08/16/2013] [Indexed: 11/17/2022]
Abstract
To improve the antimicrobial ability and cytocompatibility of biomedical titanium implants, many efforts have been made to modify their surface topography and chemical composition. In this work, Ag plasma-modified hierarchical TiO2 film was fabricated on titanium surface via acid etching to produce micropit, hydrothermal treatment to generate TiO2 nanorod and subsequent plasma immersion ion implantation process to impregnate Ag into TiO2 surface. In view of the potential clinical applications, their antimicrobial activity, bioactivity and cytocompatibility were systematically evaluated. The hierarchical TiO2 film showed enhanced bioactivity and bacteriostatic effect on both microbes due to more negative zeta potential, constructing the first defense line against microbial adhesion by electrostatic repulsion. Addition of embedded Ag remarkably enhanced the antimicrobial efficiency toward both microbes based on Schottky contact without Ag(+) release, establishing the second defense line targeting microbial membrane. Furthermore, the addition of Ag degraded the bioactivity very little and exerted nearly no adverse or even promoted effect on MG63 cell functions, including adhesion, spreading and proliferation. This work illustrates a two-defense-line antimicrobial activity in darkness with both prior electrostatic repulsion to inhibit most microbes adhesion and posterior biocidal action to kill residual ones that luckily infiltrated through the first defense line, and provide proof of concept using both clinically relevant human pathogens. In conclusion, the Ag-embedded hierarchical TiO2 film with excellent antimicrobial activity, bioactivity and cytocompatibility provides a promising candidate for orthopedic and dental implants.
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Affiliation(s)
- Jinhua Li
- State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
| | - Xuanyong Liu
- State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China.
| | - Yuqin Qiao
- State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
| | - Hongqin Zhu
- State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
| | - Chuanxian Ding
- State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
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