Evaluation of peroxyacetic acid as a potential pre-grinding treatment for control of enteric pathogens on fresh beef trim

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Title: Evaluation of peroxyacetic acid as a potential pre-grinding treatment for control of enteric pathogens on fresh beef trim
Author: Ellebracht, John Wayne
Abstract: 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 .
URI: http : / /hdl .handle .net /1969 .1 /2704
Date: 2005-11-01

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Evaluation of peroxyacetic acid as a potential pre-grinding treatment for control of enteric pathogens on fresh beef trim. Available electronically from http : / /hdl .handle .net /1969 .1 /2704 .

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