Download Biofilms in the food and beverage industries by Pina Fratamico PDF

By Pina Fratamico

Biofilms within the nutrition and beverage industries might shape while micro organism connect to and colonise the surfaces of nutrition dealing with and processing gear and meals items themselves. Human pathogens in biofilms will be more durable to take away than loose microorganisms and hence might pose a extra major meals defense threat. the outlet chapters during this crucial ebook examine primary features akin to the ecology and features of biofilms in meals and beverage processing environments and techniques for his or her detection. half then reports biofilm formation by means of varied microorganisms. half 3 specializes in the numerous problems with biofilm prevention and removing. Chapters on specific meals sectors entire the gathering.

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Com/viewarticle/441355_4). , 2003a,b). , 2003a,b; Rochex and Lebeault, 2007). , 2004; Rochex and Lebeault, 2007). In an open reticulating system there is an abundance of nutrients derived from water, particularly in cooling towers and spray bond. , not exposed to the atmosphere) are ideal systems in that the problem © 2009, Woodhead Publishing Limited Biofilms in the food and beverage industries: an introduction Entrapment Impaction Surface characteristics Attachment to the surface by flagellum by means of chemotaxis force 17 Passive and reversible Contact with the surface Signals and gene activation Receptor specific ligands; Flagella, etc.

1991). Sauer et al. (2004) and Rochex and Lebeault (2007), however, showed that high nutrient levels can lead to the detachment of P. aeruginosa and P. putida biofilms. In contrast, Oh et al. (2007) demonstrated by atomic force microscopy (AFM) that Escherichia coli O157:H7 biofilms formed faster and higher amounts of cells attached to a glass surface under low nutrient conditions than under high nutrient conditions. , 2005). 2 Temperature For many bacteria found in cooling water systems, the optimum temperature for maximum growth is about 40°C, which is the level of temperature likely to be encountered in industrial water coolers.

The structure and physicochemical properties of EPS can, however, be changed by the presence of non-polymeric organic (acetyl, pyruvyl and succinyl) and inorganic (sulphate and phosphate) compounds. Proteins and lipids can also form part of the EPS. , 1999). EPS are situated on or in close proximity to the outer surface of biofilm cells. It can be released into the surrounding environment by active secretion, during the lysis of bacterial cells, or by the detachment of materials from the cell surface.

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