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Inactivation of Salmonella enterica serovar enteritidis in shell eggs by sequential application of heat and ozone.

Abstract：

AIMS:To assess the contribution of ozone to lethality of Salmonella enterica serovar Enteritidis in experimentally inoculated whole shell eggs that are sequentially treated with heat and gaseous ozone in pilot-scale equipment. METHODS AND RESULTS:Whole shell eggs were inoculated with small populations of Salmonella Enteritidis (8.5 x 10(4)-2.4 x 10(5) CFU per egg) near the egg vitelline membrane. Eggs were subjected to immersion heating (57 degrees C for 21 min), ozone treatment (vacuum at 67.5 kPa, followed by ozonation at a maximum concentration of approx. 140 g ozone m(-3) and 184-198 kPa for 40 min) or a combination of both treatments. Survivors were detected after an enrichment process or enumerated using modified most probable number technique. Ozone, heat and combination treatments inactivated 0.11, 3.1 and 4.2 log Salmonella Enteritidis per egg, respectively. CONCLUSIONS:Sequential application of heat and gaseous ozone was significantly more effective than either heat or ozone alone. The demonstrated synergy between these treatment steps should produce safer shell eggs than the heat treatment alone. SIGNIFICANCE AND IMPACT OF THE STUDY:Shell eggs are the most common vehicle for human infection by Salmonella Enteritidis. Many cases of egg-related salmonellosis are reported annually despite efforts to reduce contamination, including thermal pasteurization of shell eggs and egg products. Treatment with ozone-based combination should produce shell eggs safer than those treated with heat alone.

journal_name

Lett Appl Microbiol

journal_title

Letters in applied microbiology

authors

Perry JJ,Rodriguez-Romo LA,Yousef AE

doi

10.1111/j.1472-765X.2008.02367.x

subject

Has Abstract

pub_date

2008-06-01 00:00:00

pages

620-5

issue

6

eissn

0266-8254

issn

1472-765X

pii

LAM2367

journal_volume

46

pub_type

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