Difference between revisions of "Biofilms on food preparation surfaces"
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<br><b>Biofilms</b> are a consortium of microorganisms and extracellular substances in association with a solid surface in contact with liquid. It is nature of microorganisms to attach to wet surface, and form slimy layer composed of extracellular polymeric substances (EPS) to protect themselves from grazers and harsh environment. Biofilms can be beneficial or detrimental to the environment on which they form. For example, stream biofilms [[stream biofilm]] are capable of recycling organic matter. On the other hand, biofilms forming on foodsurfaces can be of great concern.
Revision as of 15:54, 10 April 2010
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Legend/credit: Electron micrograph of the Ebola Zaire virus. This was the first photo ever taken of the virus, on 10/13/1976. By Dr. F.A. Murphy, now at U.C. Davis, then at the CDC.
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Biofilms are a consortium of microorganisms and extracellular substances in association with a solid surface in contact with liquid. It is nature of microorganisms to attach to wet surface, and form slimy layer composed of extracellular polymeric substances (EPS) to protect themselves from grazers and harsh environment. Biofilms can be beneficial or detrimental to the environment on which they form. For example, stream biofilms stream biofilm are capable of recycling organic matter. On the other hand, biofilms forming on food-contact surfaces can be of great concern. Food preparation surfaces are usually in contact with organic matter such as milk which is a good source of nutrients for microorganisms, with inorganic debris, with other microorganisms. So, food-contact surfaces can be a great habitat for microorganisms to grow on.
Describe the physical and chemical characteristics of the environment, using as many sections/subsections as you require. Look at other topics available in MicrobeWiki. Which involve processes similar to yours? Create links where relevant.
Biofilm formation 1)pre-conditioning of the adhesion surface 2)transport of planktonic celss from the bilk liquid to the surface 3)adsorption of cells at the surface 4)desorption of reversible adsorbed cells 5)irreversible adsorption of bacterial cells at a surface 6)production of cell-to-cell signal 7)transport of substrates to and within the biofilm 8)substrate metabolism by biofilm-bound cells and transport of products our of the biofilm 9)biofilm removal by detachment or sloughing
Conditioning of a Surface
Surface Charge and Hydrophobicity
cell surface hydrophobicity and the presence of extracellular filamentous appendages may influence the rate and the extent of microbial attachment.
filamentous appendages include flagella, pili, prosthecae and stalks
Stainless Steel as a Food Source Contact Surface
pH and Temperature
Are there important biological interactions that are important in this environment? Do these interactions influence microbial populations and their activities? How do these interactions influence other organisms? Describe biological interactions that might take place in this environment, using as many sections/subsections as you require. Look at other topics available in MicrobeWiki. Create links where relevant.
Biofilm Ecosystem Development
Coaggregation and Aggregation
Intercellular Communication within Biofilm Communities
What microbial processes define this environment? Describe microbial processes that are important in this habitat, adding sections/subsections as needed. Look at other topics in MicrobeWiki. Are some of these processes already described? Create links where relevant.
Extrcellular Polymeric Substances (EPS)
What kind of microbes do we typically find in this environment? Or associated with important processes in this environment? Describe key groups of microbes that we find in this environment, and any special adaptations they may have evolved to survive in this environment. Add sections/subsections as needed. Look at other microbe listings in MicrobeWiki. Are some of the groups of microbes from your environment already described? Create links to those pages. Specific microbial populations will be included in the next section.
Listeria monocytogenes, Salmonella spp., Staphylococcus spp., Escherichia coli O157:H7
important foodborne pathogen-listeriosis outbreak in Canada psychophilic bacteria- grow in refrigerated ready-to-eat food that may be contaminated during processing and packaging.
the most important bacteria causing spoilage of conventionally pasteurize liquid milk products: 2 routes 1)raw milk- enzyme 2)post pasteurization milk
Examples of organisms within the group
List examples of specific microbes that represent key groups or are associated with important processes found in this environment. Link to other MicrobeWiki pages where possible.
Approach for Biofilm Mitigation- biofilm prevention
Green Strategy for Biofilms Control
Cleaning and Removal of Biofilm
Microscopic Examination of Biofilms
Attachment of Microorganisms on Food Contacting Surfaces
Enter summaries of recent research here--at least three required
[Sample reference] Takai, K., Sugai, A., Itoh, T., and Horikoshi, K. "Palaeococcus ferrophilus gen. nov., sp. nov., a barophilic, hyperthermophilic archaeon from a deep-sea hydrothermal vent chimney". International Journal of Systematic and Evolutionary Microbiology. 2000. Volume 50. p. 489-500.
Edited by student of Angela Kent at the University of Illinois at Urbana-Champaign.