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Parra A, Toro M, Jacob R, Navarrete P, Troncoso M, Figueroa G, Reyes-Jara A. Antimicrobial effect of copper surfaces on bacteria isolated from poultry meat. Braz J Microbiol 2018; 49 Suppl 1:113-118. [PMID: 30181050 PMCID: PMC6328842 DOI: 10.1016/j.bjm.2018.06.008] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2017] [Revised: 05/15/2018] [Accepted: 06/05/2018] [Indexed: 01/08/2023] Open
Abstract
Poultry meat is a food product that usually carries high rates of microbial contamination, including foodborne pathogens. The poultry industry has established different systems to minimize these hazards. In recent years, extensive literature has demonstrated the antimicrobial activity of different contact surfaces made of copper to effectively reduce microbial loads. The aim of the present study was to evaluate the antibacterial effect of copper surfaces on the transmission of two foodborne pathogens – Salmonella enterica and Listeria monocytogenes – and a poultry native microbiota bacterial species – Enterobacter cloacae. We also evaluated the impact of the poultry meat matrix on the antimicrobial activity of a copper surface. Our results indicated that copper surfaces reduced the bacterial load quickly (<than 4 min) when the microorganisms were exposed to polished copper surfaces. Even when bacteria were inoculated on copper surfaces soiled with the organic matrix (washing water from poultry carcasses) and survival rates were significantly higher, an antimicrobial effect was still observed. Survival rates of two microorganisms simultaneously exposed to copper did not show significant differences. We found an antimicrobial effect over pathogenic and non-pathogenic microorganisms. Results suggest a potential role for copper surfaces in the control of microbiological hazards in the poultry industry.
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Affiliation(s)
- Angel Parra
- Laboratory of Microbiology and Probiotics, Institute of Nutrition and Food Technology (INTA), University of Chile, Santiago, Chile
| | - Magaly Toro
- Laboratory of Microbiology and Probiotics, Institute of Nutrition and Food Technology (INTA), University of Chile, Santiago, Chile
| | - Ricardo Jacob
- Laboratory of Microbiology and Probiotics, Institute of Nutrition and Food Technology (INTA), University of Chile, Santiago, Chile
| | - Paola Navarrete
- Laboratory of Microbiology and Probiotics, Institute of Nutrition and Food Technology (INTA), University of Chile, Santiago, Chile
| | - Miriam Troncoso
- Laboratory of Microbiology and Probiotics, Institute of Nutrition and Food Technology (INTA), University of Chile, Santiago, Chile
| | - Guillermo Figueroa
- Laboratory of Microbiology and Probiotics, Institute of Nutrition and Food Technology (INTA), University of Chile, Santiago, Chile
| | - Angélica Reyes-Jara
- Laboratory of Microbiology and Probiotics, Institute of Nutrition and Food Technology (INTA), University of Chile, Santiago, Chile.
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Vincent M, Duval RE, Hartemann P, Engels-Deutsch M. Contact killing and antimicrobial properties of copper. J Appl Microbiol 2018; 124:1032-1046. [PMID: 29280540 DOI: 10.1111/jam.13681] [Citation(s) in RCA: 270] [Impact Index Per Article: 45.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2017] [Revised: 12/06/2017] [Accepted: 12/20/2017] [Indexed: 12/15/2022]
Abstract
With the emergence of antibiotic resistance, the interest for antimicrobial agents has recently increased again in public health. Copper was recognized in 2008 by the United States Environmental Protection Agency (EPA) as the first metallic antimicrobial agent. This led to many investigations of the various properties of copper as an antibacterial, antifungal and antiviral agent. This review summarizes the latest findings about 'contact killing', the mechanism of action of copper nanoparticles and the different ways micro-organisms develop resistance to copper.
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Affiliation(s)
- M Vincent
- CNRS, LEMTA, UMR 7563, Vandœuvre-lès-Nancy, France.,Université de Lorraine, LEMTA, UMR 7563, Vandœuvre-lès Nancy, France
| | - R E Duval
- CNRS, UMR 7565, SRSMC, Vandœuvre-lès-Nancy, France.,Université de Lorraine, UMR 7565, SRSMC, Nancy, France.,ABC Platform®, Nancy, France
| | - P Hartemann
- Faculté de Médecine, EA 7298, ERAMBO, DESP, Vandœuvre-lès-Nancy, France
| | - M Engels-Deutsch
- CNRS, LEMTA, UMR 7563, Vandœuvre-lès-Nancy, France.,Université de Lorraine, LEMTA, UMR 7563, Vandœuvre-lès Nancy, France.,Faculté de Médecine, EA 7298, ERAMBO, DESP, Vandœuvre-lès-Nancy, France
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Ellinas K, Kefallinou D, Stamatakis K, Gogolides E, Tserepi A. Is There a Threshold in the Antibacterial Action of Superhydrophobic Surfaces? ACS APPLIED MATERIALS & INTERFACES 2017; 9:39781-39789. [PMID: 29058866 DOI: 10.1021/acsami.7b11402] [Citation(s) in RCA: 58] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
The realization of antibacterial surfaces is an important scientific problem, which may be addressed by the use of superhydrophobic surfaces, reducing bacterial adhesion. However, there are several limitations and contradicting reports on the antibacterial efficacy of such surfaces. Moreover, achieving antibacterial action through minimization of adhesion does not ensure complete protection against bacteria. Here, we identify the important factors affecting antibacterial action on superhydrophobic surfaces, emphasizing the role of bacterial concentration, and observing an upper concentration threshold above which antibacterial action of any surface is compromised. Finally, we propose metal enriched, superhydrophobic surfaces, as the "ultimate" "hybrid" antibacterial surfaces for in vitro applications.
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Affiliation(s)
- Kosmas Ellinas
- Institute of Nanoscience and Nanotechnology, ⊥Institute of Biosciences and Applications, and §Nanoplasmas P.C. Technology Park "Lefkippos", National Center for Scientific Research Demokritos , Aghia Paraskevi, Attiki, Greece 15341
| | - Dionysia Kefallinou
- Institute of Nanoscience and Nanotechnology, ⊥Institute of Biosciences and Applications, and §Nanoplasmas P.C. Technology Park "Lefkippos", National Center for Scientific Research Demokritos , Aghia Paraskevi, Attiki, Greece 15341
| | - Kostas Stamatakis
- Institute of Nanoscience and Nanotechnology, ⊥Institute of Biosciences and Applications, and §Nanoplasmas P.C. Technology Park "Lefkippos", National Center for Scientific Research Demokritos , Aghia Paraskevi, Attiki, Greece 15341
| | - Evangelos Gogolides
- Institute of Nanoscience and Nanotechnology, ⊥Institute of Biosciences and Applications, and §Nanoplasmas P.C. Technology Park "Lefkippos", National Center for Scientific Research Demokritos , Aghia Paraskevi, Attiki, Greece 15341
| | - Angeliki Tserepi
- Institute of Nanoscience and Nanotechnology, ⊥Institute of Biosciences and Applications, and §Nanoplasmas P.C. Technology Park "Lefkippos", National Center for Scientific Research Demokritos , Aghia Paraskevi, Attiki, Greece 15341
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Tripathy A, Sreedharan S, Bhaskarla C, Majumdar S, Peneti SK, Nandi D, Sen P. Enhancing the Bactericidal Efficacy of Nanostructured Multifunctional Surface Using an Ultrathin Metal Coating. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:12569-12579. [PMID: 29017327 DOI: 10.1021/acs.langmuir.7b02291] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
Insects and plants exhibit bactericidal behavior through nanostructures, which leads to physical contact killing that does not require antibiotics or chemicals. Also, certain metallic ions (e.g., Ag+ and Cu2+) are well-known to kill bacteria by disrupting their cellular functionalities. The aim of this study is to explore the improvement in bactericidal activity by combining extreme physical structure with surface chemistry. We have fabricated tall (8-9 μm high) nanostructures on silicon surfaces (NSS) having sharp tips (35-110 nm) using a single-step, maskless deep reactive ion etching technique inspired by dragonfly wing. Bactericidal efficacy of the nanostructured surfaces coated with a thin layer of silver (NSS_Ag) or copper (NSS_Cu) was measured quantitatively using standard viability plate-count method and flow cytometry. NSS_Cu surfaces kill bacteria very efficiently (killing 97% within 30 min) when compared to the uncoated NSS. This can be attributed to the addition of a surface chemistry to the nanostructures. The antibacterial activity of NSS_Cu is further indicated by the morphological differences of the dying/dead bacteria observed in the SEM images. The nanostructured surfaces demonstrate excellent superhydrophobic behavior, even with an ultrathin layer of metal (Ag/Cu) coating. The nanostructured surfaces exhibit static contact angle greater than 150° and contact hysteresis less than 10°. Moreover, reflectance is found to be <1% (for NSS_Cu < 0.5%) for all the nanostructured surfaces in the wavelength range 250-800 nm. The results obtained suggest that the fabricated nanostructured surfaces are multifunctional and can be used in various practical applications.
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Affiliation(s)
- Abinash Tripathy
- Centre for Nano Science and Engineering and ‡Department of Biochemistry, Indian Institute of Science , Bangalore 560012, India
| | - Syama Sreedharan
- Centre for Nano Science and Engineering and ‡Department of Biochemistry, Indian Institute of Science , Bangalore 560012, India
| | - Chetana Bhaskarla
- Centre for Nano Science and Engineering and ‡Department of Biochemistry, Indian Institute of Science , Bangalore 560012, India
| | - Shamik Majumdar
- Centre for Nano Science and Engineering and ‡Department of Biochemistry, Indian Institute of Science , Bangalore 560012, India
| | - Sudheer Kumar Peneti
- Centre for Nano Science and Engineering and ‡Department of Biochemistry, Indian Institute of Science , Bangalore 560012, India
| | - Dipankar Nandi
- Centre for Nano Science and Engineering and ‡Department of Biochemistry, Indian Institute of Science , Bangalore 560012, India
| | - Prosenjit Sen
- Centre for Nano Science and Engineering and ‡Department of Biochemistry, Indian Institute of Science , Bangalore 560012, India
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Mitra D, Li M, Kang ET, Neoh KG. Transparent Copper-Loaded Chitosan/Silica Antibacterial Coatings with Long-Term Efficacy. ACS APPLIED MATERIALS & INTERFACES 2017; 9:29515-29525. [PMID: 28792197 DOI: 10.1021/acsami.7b07700] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Bacteria-contaminated inanimate surfaces within hospitals and clinics result in transmission of pathogens via direct or indirect contact, leading to increased risk of healthcare-associated infections (HAI). The use of antibacterial coatings is a potential way of reducing the bacterial burden, but many surfaces such as instrument panels and monitors necessitate the coatings to be transparent while being highly antibacterial. In this work, silica nanoparticles (SiO2 NPs) were first grown over a layer of acrylated quaternized chitosan (AQCS) covalently immobilized on commercially available transparent poly(vinyl fluoride) (PVF) films. The SiO2 NPs then served as nanoreservoirs for adsorption of copper ions. The coated PVF films were transparent and reduced viable bacterial count by ∼99% and 100%, when incubated with a bacteria-loaded droplet for 60 and 120 min, respectively. The killing efficacy of these coatings, after wiping 100 times, with a deionized water-wetted cloth was reduced slightly to 97-98%. The stability of these coatings can be further improved with the deposition of another layer of cationic quaternized chitosan (QCS) over the negatively charged SiO2 NP layer, wherein the coatings maintained ∼99% killing efficacy even after 100 wipes. These coatings showed no significant toxicity to mammalian cells and, hence, can potentially be used in a clinical setting for reducing HAI.
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Affiliation(s)
- Debirupa Mitra
- Department of Chemical and Biomolecular Engineering, National University of Singapore , Kent Ridge, Singapore 117576
| | - Min Li
- Department of Chemical and Biomolecular Engineering, National University of Singapore , Kent Ridge, Singapore 117576
| | - En-Tang Kang
- Department of Chemical and Biomolecular Engineering, National University of Singapore , Kent Ridge, Singapore 117576
| | - Koon Gee Neoh
- Department of Chemical and Biomolecular Engineering, National University of Singapore , Kent Ridge, Singapore 117576
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57
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Killing of bacteria by copper, cadmium, and silver surfaces reveals relevant physicochemical parameters. Biointerphases 2017; 12:020301. [DOI: 10.1116/1.4980127] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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58
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Liu S, Zhang XX. Small colony variants are more susceptible to copper-mediated contact killing for Pseudomonas aeruginosa and Staphylococcus aureus. J Med Microbiol 2016; 65:1143-1151. [DOI: 10.1099/jmm.0.000348] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Affiliation(s)
- Sha Liu
- Institute of Natural and Mathematical Sciences, Massey University, Auckland 0745, New Zealand
| | - Xue-Xian Zhang
- Institute of Natural and Mathematical Sciences, Massey University, Auckland 0745, New Zealand
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Antibacterial Metallic Touch Surfaces. MATERIALS 2016; 9:ma9090736. [PMID: 28773856 PMCID: PMC5457048 DOI: 10.3390/ma9090736] [Citation(s) in RCA: 53] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/06/2016] [Revised: 08/17/2016] [Accepted: 08/24/2016] [Indexed: 12/20/2022]
Abstract
Our aim is to present a comprehensive review of the development of modern antibacterial metallic materials as touch surfaces in healthcare settings. Initially we compare Japanese, European and US standards for the assessment of antimicrobial activity. The variations in methodologies defined in these standards are highlighted. Our review will also cover the most relevant factors that define the antimicrobial performance of metals, namely, the effect of humidity, material geometry, chemistry, physical properties and oxidation of the material. The state of the art in contact-killing materials will be described. Finally, the effect of cleaning products, including disinfectants, on the antimicrobial performance, either by direct contact or by altering the touch surface chemistry on which the microbes attach, will be discussed. We offer our outlook, identifying research areas that require further development and an overview of potential future directions of this exciting field.
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Wang C, Ehrhardt CJ, Yadavalli VK. Nanoscale imaging and hydrophobicity mapping of the antimicrobial effect of copper on bacterial surfaces. Micron 2016; 88:16-23. [PMID: 27258941 DOI: 10.1016/j.micron.2016.05.005] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2016] [Revised: 05/05/2016] [Accepted: 05/12/2016] [Indexed: 12/21/2022]
Abstract
Copper has a long historical role in the arena of materials with antimicrobial properties. Various forms of copper ranging from surfaces to impregnation in textiles and particles, have attracted considerable interest owing to their versatility, potency, chemical stability, and low cost. However, the effects and mechanisms of their antimicrobial action is still unclear. In this study, the effect of copper particles on Escherichia coli was studied at the nanoscale using atomic force microscopy (AFM). Time-lapse AFM images at the single cell level show the morphological changes on live E. coli during antimicrobial treatment, in which for the first time, this process was followed in situ on the same cell over time. AFM-based hydrophobicity mapping further showed that incubating cells with Cu decreased the surface hydrophobicity with an increase of incubation time. Specifically, we are able to visualize both morphology and physico-chemical nature of the bacterial cell surface change in response to copper treatment, leading to the membrane damage and cytoplasm leakage. Overall, the time-lapse AFM imaging combined with hydrophobicity mapping approach presented here provides spatio-temporal insight into the antimicrobial mechanisms of copper at the single cell level, and can be applied to design of better metallic antimicrobial materials as well as investigate different microorganisms.
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Affiliation(s)
- Congzhou Wang
- Department of Chemical and Life Science Engineering, Virginia Commonwealth University, Richmond, VA, USA
| | | | - Vamsi K Yadavalli
- Department of Chemical and Life Science Engineering, Virginia Commonwealth University, Richmond, VA, USA.
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