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Effect of controlled atmosphere storage, modified atmosphere packaging and gaseous ozone treatment on the survival of Salmonella Enteritidis on cherry tomatoes.
Food Microbiol. 2006 Aug; 23(5):430-8.FM

Abstract

In recent years, outbreaks of infections associated with raw and minimally processed fruits and vegetables have been reported. The objective of this study was to analyse the growth/survival of Salmonella Enteritidis at spot-inoculated or stem-injected cherry tomatoes during passive modified atmosphere packaging (MAP), controlled atmosphere (CA) and to compare the results with those of air storage at 7 and 22 degrees C. During MAP, the gas composition equilibrated to 6% O2/4% CO2. CO2 level was maintained as 5% through the term of CA storage at 7 and 22 degrees C. The results demonstrate that S. Enteritidis can survive and/or grow during the storage of tomatoes depending on the location site of the pathogen on fruit, suspension cell density and storage temperature. During MAP, CA and air storage, S. Enteritidis with initial population of 7.0 log10 cfu/tomato survived on tomato surfaces with an approximate decrease of 4.0-5.0 log10 cfu/tomato in population within the storage period; however, in the case of initial population of 3.0 log10 cfu/tomato, cells died completely on day 4 during MAP storage and on day 6 during both CA and air storage. The death rate of S. Enteritidis on the surfaces of tomatoes that were stored in MAP was faster than that of stored in air and in CA. Storage temperature was effective on the survival of S. Enteritidis for the samples stored at ambient atmosphere; cells died completely on day 6 at 7 degrees C and on day 8 at 22 degrees C. Stem scars provided protective environments for Salmonella; an approximate increase of 1.0 log10 cfu/tomato in stem-scar population was observed during MAP, CA and air storage at 22 degrees C within the period of 20 days. Cells survived with no significant change in number at 7 degrees C. During the research, the effect of ozone treatment (5-30 mg/l ozone gas for 0-20 min) was also considered for surface sanitation before storage. Gaseous ozone treatment has bactericidal effect on S. Enteritidis, inoculated on the surface of the tomatoes and can be used for surface sanitation of S. Enteritidis on tomatoes before storage at different conditions. Ten mg/l ozone gas treatment with different time intervals of 5 and 15 min was found to be effective respectively on low and high dose inoculum levels of S. Enteritidis attached for 1 h. Another variable considered during ozone treatment was the 4 h attachment time.

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Authors+Show Affiliations

Daş E
Department of Food Engineering, Middle East Technical University, 06531 Ankara, Turkey.
Gürakan GC
No affiliation info available
Bayindirli A
No affiliation info available

MeSH

Colony Count, MicrobialConsumer Product SafetyDose-Response Relationship, DrugFood ContaminationFood MicrobiologyFood PackagingFood PreservationHumansLycopersicon esculentumNitrogenOxygenOzoneSalmonella Food PoisoningSalmonella enteritidisTemperatureTime FactorsVacuum

Pub Type(s)

Journal Article

Language

eng

PubMed ID

16943034

Citation

Daş, Elif, et al. "Effect of Controlled Atmosphere Storage, Modified Atmosphere Packaging and Gaseous Ozone Treatment On the Survival of Salmonella Enteritidis On Cherry Tomatoes." Food Microbiology, vol. 23, no. 5, 2006, pp. 430-8.
Daş E, Gürakan GC, Bayindirli A. Effect of controlled atmosphere storage, modified atmosphere packaging and gaseous ozone treatment on the survival of Salmonella Enteritidis on cherry tomatoes. Food Microbiol. 2006;23(5):430-8.
Daş, E., Gürakan, G. C., & Bayindirli, A. (2006). Effect of controlled atmosphere storage, modified atmosphere packaging and gaseous ozone treatment on the survival of Salmonella Enteritidis on cherry tomatoes. Food Microbiology, 23(5), 430-8.
Daş E, Gürakan GC, Bayindirli A. Effect of Controlled Atmosphere Storage, Modified Atmosphere Packaging and Gaseous Ozone Treatment On the Survival of Salmonella Enteritidis On Cherry Tomatoes. Food Microbiol. 2006;23(5):430-8. PubMed PMID: 16943034.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Effect of controlled atmosphere storage, modified atmosphere packaging and gaseous ozone treatment on the survival of Salmonella Enteritidis on cherry tomatoes. AU - Daş,Elif, AU - Gürakan,G Candan, AU - Bayindirli,Alev, Y1 - 2005/09/29/ PY - 2005/03/12/received PY - 2005/08/01/accepted PY - 2006/9/1/pubmed PY - 2006/9/26/medline PY - 2006/9/1/entrez SP - 430 EP - 8 JF - Food microbiology JO - Food Microbiol VL - 23 IS - 5 N2 - In recent years, outbreaks of infections associated with raw and minimally processed fruits and vegetables have been reported. The objective of this study was to analyse the growth/survival of Salmonella Enteritidis at spot-inoculated or stem-injected cherry tomatoes during passive modified atmosphere packaging (MAP), controlled atmosphere (CA) and to compare the results with those of air storage at 7 and 22 degrees C. During MAP, the gas composition equilibrated to 6% O2/4% CO2. CO2 level was maintained as 5% through the term of CA storage at 7 and 22 degrees C. The results demonstrate that S. Enteritidis can survive and/or grow during the storage of tomatoes depending on the location site of the pathogen on fruit, suspension cell density and storage temperature. During MAP, CA and air storage, S. Enteritidis with initial population of 7.0 log10 cfu/tomato survived on tomato surfaces with an approximate decrease of 4.0-5.0 log10 cfu/tomato in population within the storage period; however, in the case of initial population of 3.0 log10 cfu/tomato, cells died completely on day 4 during MAP storage and on day 6 during both CA and air storage. The death rate of S. Enteritidis on the surfaces of tomatoes that were stored in MAP was faster than that of stored in air and in CA. Storage temperature was effective on the survival of S. Enteritidis for the samples stored at ambient atmosphere; cells died completely on day 6 at 7 degrees C and on day 8 at 22 degrees C. Stem scars provided protective environments for Salmonella; an approximate increase of 1.0 log10 cfu/tomato in stem-scar population was observed during MAP, CA and air storage at 22 degrees C within the period of 20 days. Cells survived with no significant change in number at 7 degrees C. During the research, the effect of ozone treatment (5-30 mg/l ozone gas for 0-20 min) was also considered for surface sanitation before storage. Gaseous ozone treatment has bactericidal effect on S. Enteritidis, inoculated on the surface of the tomatoes and can be used for surface sanitation of S. Enteritidis on tomatoes before storage at different conditions. Ten mg/l ozone gas treatment with different time intervals of 5 and 15 min was found to be effective respectively on low and high dose inoculum levels of S. Enteritidis attached for 1 h. Another variable considered during ozone treatment was the 4 h attachment time. SN - 0740-0020 UR - https://www.unboundmedicine.com/medline/citation/16943034/Effect_of_controlled_atmosphere_storage_modified_atmosphere_packaging_and_gaseous_ozone_treatment_on_the_survival_of_Salmonella_Enteritidis_on_cherry_tomatoes_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0740-0020(05)00109-7 DB - PRIME DP - Unbound Medicine ER -