In the initial study involving the use of NEO water to wash iceberg 294 lettuce in the automated produce washer (Afari et al., 2015), the greatest reductions of E. coli O157:H7 were observed after 30 min of treatment.The washing speeds used were 40 and 65 rpm (without changing the direction) and it was determined that the higher agitation and washing speed significantly improved pathogen reduction (p<0.05).Washing for 30 min at 40 rpm and 65 rpm reduced E. coli O157:H7 by 2.4 log CFU/g and 3.2 log CFU/g, respectively. In the case of S. Typhimurium DT 104, washing for 30 min at 40 rpm and 65 rpm resulted in reductions of 3.6 log CFU/g and 4.6 log CFU/g, respectively.This observation led to the use of a washing speed of 100 rpm in all of the treatments in this studyAn increase in the rate of agitation and flow velocity was shown to increase the reduction of E. coli O157:H7 on the surface of cantaloupe surfaces and cup apples after peroxyacetic acid treatment (Wang et al., 2007)A similar observation was made by Vijayakumar & Wolf-Hall (2002) when they determined that the treatment time needed to achieve a 5-log reduction of E. coli O157:H7 on iceberg lettuce during an acetic acid treatment increased from 5 to 10 min when agitation was absent.
การแปล กรุณารอสักครู่..