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Effect of zinc oxide film morphologies on the formation of Shewanella putrefaciens biofilm. Biointerphases 2017; 12:011002. [PMID: 28183187 DOI: 10.1116/1.4976003] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Zinc oxide (ZnO) films were prepared on aluminum substrate by a hydrothermal method to investigate the effect of their surface characteristics, including morphology and hydrophobicity, on the corresponding antibiofilm performance. The surface characteristics of the prepared ZnO films were examined by a comprehensive range of methodologies, suggesting that films of distinctive surface morphologies were successfully formed. Subsequently, their antibiofilm activities, using Shewanella putrefaciens as a model bacterium, were assessed. Surface measurements confirmed that the ZnO films equipped with a nanoscopic needlelike surface feature are more hydrophobic than those possessing densely packed microflakes. The reduced number of live cells and presence of biofilm, confirmed by optical and electron microscopy results, suggest that the former films possess an excellent antibiofilm performance. It is believed that the engineered nanoscopic needle feature might penetrate the cell membrane when they are in contact, allowing the effective substance of ZnO antibacterial ingredients to diffuse into the embedded bacteria. Furthermore, such surface characteristics might perturb the integrity of the cell membrane causing the intracellular substance is leaked from the cells. As such, the combinatorial effects of nanoscopic feature resulted in an inhibited growth of S. putrefaciens biofilm on ZnO film.
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Nanotechnology to the rescue: using nano-enabled approaches in microbiological food safety and quality. Curr Opin Biotechnol 2016; 44:87-93. [PMID: 27992831 DOI: 10.1016/j.copbio.2016.11.012] [Citation(s) in RCA: 78] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2016] [Accepted: 11/18/2016] [Indexed: 12/12/2022]
Abstract
Food safety and quality assurance is entering a new era. Interventions along the food supply chain must become more efficient in safeguarding public health and the environment and must address numerous challenges and new consumption trends. Current methods of microbial control to assure the safety of food and minimize microbial spoilage have each shown inefficiencies. Nanotechnology is a rapidly expanding area in the agri/feed/food sector. Nano-enabled approaches such as antimicrobial food-contact surfaces/packaging, nano-enabled sensors for rapid pathogen/contaminant detection and nano-delivered biocidal methods, currently on the market or at a developmental stage, show great potential for the food industry. Concerns on potential risks to human health and the environment posed by use of engineered nanomaterials (ENMs) in food applications must, however, be adequately evaluated at the developmental stage to ensure consumer's acceptance.
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Gu H, Chen A, Song X, Brasch ME, Henderson JH, Ren D. How Escherichia coli lands and forms cell clusters on a surface: a new role of surface topography. Sci Rep 2016; 6:29516. [PMID: 27412365 PMCID: PMC4944170 DOI: 10.1038/srep29516] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2015] [Accepted: 06/20/2016] [Indexed: 12/21/2022] Open
Abstract
Bacterial response to surface topography during biofilm formation was studied using 5 μm tall line patterns of poly (dimethylsiloxane) (PDMS). Escherichia coli cells attached on top of protruding line patterns were found to align more perpendicularly to the orientation of line patterns when the pattern narrowed. Consistently, cell cluster formation per unit area on 5 μm wide line patterns was reduced by 14-fold compared to flat PDMS. Contrasting the reduced colony formation, cells attached on narrow patterns were longer and had higher transcriptional activities, suggesting that such unfavorable topography may present a stress to attached cells. Results of mutant studies indicate that flagellar motility is involved in the observed preference in cell orientation on narrow patterns, which was corroborated by the changes in cell rotation pattern before settling on different surface topographies. These findings led to a set of new design principles for creating antifouling topographies, which was validated using 10 μm tall hexagonal patterns.
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Affiliation(s)
- Huan Gu
- Department of Biomedical and Chemical Engineering, Syracuse University, Syracuse, NY 13244, USA.,Syracuse Biomaterials Institute, Syracuse University, Syracuse, NY 13244, USA
| | - Aaron Chen
- Department of Biomedical and Chemical Engineering, Syracuse University, Syracuse, NY 13244, USA.,Syracuse Biomaterials Institute, Syracuse University, Syracuse, NY 13244, USA
| | - Xinran Song
- Department of Biomedical and Chemical Engineering, Syracuse University, Syracuse, NY 13244, USA.,Syracuse Biomaterials Institute, Syracuse University, Syracuse, NY 13244, USA
| | - Megan E Brasch
- Department of Biomedical and Chemical Engineering, Syracuse University, Syracuse, NY 13244, USA.,Syracuse Biomaterials Institute, Syracuse University, Syracuse, NY 13244, USA
| | - James H Henderson
- Department of Biomedical and Chemical Engineering, Syracuse University, Syracuse, NY 13244, USA.,Syracuse Biomaterials Institute, Syracuse University, Syracuse, NY 13244, USA
| | - Dacheng Ren
- Department of Biomedical and Chemical Engineering, Syracuse University, Syracuse, NY 13244, USA.,Syracuse Biomaterials Institute, Syracuse University, Syracuse, NY 13244, USA.,Department of Civil and Environmental Engineering, Syracuse University, Syracuse, NY 13244, USA.,Department of Biology, Syracuse University, Syracuse, NY 13244, United States
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Feng G, Cheng Y, Wang SY, Borca-Tasciuc DA, Worobo RW, Moraru CI. Bacterial attachment and biofilm formation on surfaces are reduced by small-diameter nanoscale pores: how small is small enough? NPJ Biofilms Microbiomes 2015; 1:15022. [PMID: 28721236 PMCID: PMC5515209 DOI: 10.1038/npjbiofilms.2015.22] [Citation(s) in RCA: 115] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2015] [Revised: 08/31/2015] [Accepted: 09/07/2015] [Indexed: 11/09/2022] Open
Abstract
BACKGROUND/OBJECTIVES Prevention of biofilm formation by bacteria is of critical importance to areas that directly affect human health and life including medicine, dentistry, food processing and water treatment. This work showcases an effective and affordable solution for reducing attachment and biofilm formation by several pathogenic bacteria commonly associated with foodborne illnesses and medical infections. METHODS Our approach exploits anodisation to create alumina surfaces with cylindrical nanopores with diameters ranging from 15 to 100 nm, perpendicular to the surface. The anodic surfaces were evaluated for attachment by Escherichia coli, Listeria monocytogenes, Staphylococcus aureus and Staphylococcus epidermidis. Cell-surface interaction forces were calculated and related to attachment. RESULTS We found that anodic alumina surfaces with pore diameters of 15 and 25 nm were able to effectively minimise bacterial attachment or biofilm formation by all the microorganisms tested. Using a predictive physicochemical approach on the basis of the extended Derjaguin and Landau, Verwey and Overbeek (XDLVO) theory, we attributed the observed effects largely to the repulsive forces, primarily electrostatic and acid-base forces, which were greatly enhanced by the large surface area originating from the high density, small-diameter pores. We also demonstrate how this predictive approach could be used to optimise different elements of surface topography, particularly pore diameter and density, for further enhancing the observed bacteria-repelling effects. CONCLUSIONS We demonstrate that anodic nanoporous surfaces can effectively reduce bacterial attachment. These findings are expected to have immediate, far-reaching implications and commercial applications, primarily in health care and the food industry.
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Affiliation(s)
- Guoping Feng
- Department of Food Science, Cornell University, Ithaca, NY, USA
| | - Yifan Cheng
- Department of Food Science, Cornell University, Ithaca, NY, USA
| | - Shu-Yi Wang
- Department of Mechanical, Aerospace and Nuclear Engineering, Rensselaer Polytechnic Institute, Troy, NY, USA
| | - Diana A Borca-Tasciuc
- Department of Mechanical, Aerospace and Nuclear Engineering, Rensselaer Polytechnic Institute, Troy, NY, USA
| | - Randy W Worobo
- Department of Food Science, Cornell University, Ithaca, NY, USA
| | - Carmen I Moraru
- Department of Food Science, Cornell University, Ithaca, NY, USA
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Ma L, Yang Y, Yao J, Shao Z, Huang Y, Chen X. Selective chemical modification of soy protein for a tough and applicable plant protein-based material. J Mater Chem B 2015; 3:5241-5248. [DOI: 10.1039/c5tb00523j] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A tough, stable, and antimicrobial soy protein film is obtained from the slight chemical modification on the polypeptide chain, which broadens the application area of such a cheap, abundant and sustainable natural material.
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Affiliation(s)
- Li Ma
- State Key Laboratory of Molecular Engineering of Polymers
- Collaborative Innovation Center of Polymers and Polymer Composite Materials
- Department of Macromolecular Science
- Laboratory of Advanced Materials
- Fudan University
| | - Yuhong Yang
- Research Centre for Analysis and Measurement
- Fudan University
- Shanghai 200433
- People's Republic of China
| | - Jinrong Yao
- State Key Laboratory of Molecular Engineering of Polymers
- Collaborative Innovation Center of Polymers and Polymer Composite Materials
- Department of Macromolecular Science
- Laboratory of Advanced Materials
- Fudan University
| | - Zhengzhong Shao
- State Key Laboratory of Molecular Engineering of Polymers
- Collaborative Innovation Center of Polymers and Polymer Composite Materials
- Department of Macromolecular Science
- Laboratory of Advanced Materials
- Fudan University
| | - Yufang Huang
- Department of Materials Science
- Fudan University
- Shanghai 200433
- People's Republic of China
| | - Xin Chen
- State Key Laboratory of Molecular Engineering of Polymers
- Collaborative Innovation Center of Polymers and Polymer Composite Materials
- Department of Macromolecular Science
- Laboratory of Advanced Materials
- Fudan University
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