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Proceedings Paper

Attachment of Escherichia coli O157:H7, Salmonella Typhimurium, and Listeria monocytogenes to beef and inactivation using hydrodynamic pressure processing
Author(s): Jitendra R. Patel; Morse B. Solomon
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Paper Abstract

The attachment strength of Escherichia coli O157:H7, Salmonella Typhimurium, and Listeria monocytogenes to beef surface was evaluated. The effect of bacterial attachment strength on inactivation by HDP treatment was studied. Bacterial attachment was defined as loosely attached (analyzed first by running diluent over the beef cubes) and strongly attached (analyzed again rinsed cubes by pummeling for 2 min in diluent) to the beef surface. Most attachment of these three pathogens occurred within 10 min. There was no significant difference in attachment strength of pathogens during the first 30 minutes exposure time. Strongly attached bacteria to beef surface were inactivated by HDP at a greater rate and the reduction was significant for all three bacteria (0.52, 0.37, and 0.43 log10 CFU/g for E. coli O157:H7, S. Typhimurium, and L. monocytogenes, respectively). No clear indications were obtained for sub-lethal damage of microorganisms surviving the HDP treatment. These findings disclose that HDP treatment is more lethal to pathogenic bacteria strongly attached to beef surface compared to those planktonic or loosely attached cells.

Paper Details

Date Published: 8 November 2005
PDF: 6 pages
Proc. SPIE 5996, Optical Sensors and Sensing Systems for Natural Resources and Food Safety and Quality, 59961E (8 November 2005); doi: 10.1117/12.630569
Show Author Affiliations
Jitendra R. Patel, USDA Agricultural Research Ctr. (United States)
Morse B. Solomon, USDA Agricultural Research Ctr. (United States)


Published in SPIE Proceedings Vol. 5996:
Optical Sensors and Sensing Systems for Natural Resources and Food Safety and Quality
Yud-Ren Chen; George E. Meyer; Shu-I Tu, Editor(s)

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