Peroxyacetic acid was evaluated in four separate trials for ability to reduce populations of Escherichia coli O157:H7 and Salmonella serotype Typhimurium (ATCC 13311) on fresh beef trim. Trial 1 examined the effectiveness of peroxyacetic acid on individual pieces of fresh beef trim. Trial 2 was performed to evaluate the effectiveness of peroxyacetic acid at low levels of contamination on batches of trim. Trial 3 studied the washing effect of the dip due to water. Lastly, Trial 4 compared the effectiveness of peroxyacetic acid to lactic acid. At various inoculation levels, peroxyacetic acid reduced populations of rifampicin-resistant E. coli O157:H7 and S. Typhimurium by approximately 1.0 log CFU/cm2. Much of the reductions recorded in Trials 1 and 2 may have been due to the washing effect of the dip. Trial 3 showed that approximately half of the reduction was due to the water dip. In addition, as shown in Trial 1, increases in concentrations (> 200 ppm) did not significantly increase log reductions of rifampicin-resistant E. coli O157:H7 and S. Typhimurium. Following a water dip in Trial 4, peroxyacetic acid caused a reduction of 0.7 log CFU/cm2 in E. coli O157:H7 and 1.0 log CFU/cm2 in S. Typhimurium, whereas lactic acid caused reduction of 1.3 log CFU/cm2 in E. coli O157:H7 and 2.1 log CFU/cm2 in S. Typhimurium following the water dip. Peroxyacetic acid was not more effective than 2% L-lactic acid in reducing pathogens on fresh beef trim.
| Identifer | oai:union.ndltd.org:TEXASAandM/oai:repository.tamu.edu:1969.1/2704 |
| Date | 01 November 2005 |
| Creators | Ellebracht, John Wayne |
| Contributors | Savell, Jeff W., Acuff, Gary R., Townsend, Joe |
| Publisher | Texas A&M University |
| Source Sets | Texas A and M University |
| Language | en_US |
| Detected Language | English |
| Type | Electronic Thesis, text |
| Format | 566202 bytes, electronic, application/pdf, born digital |
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