Survival of Listeria innocua on Fuji apples under commercial cold storage with or without low dose continuous ozone gaseous

Food Microbiology
Lina ShengMei-Jun Zhu

Abstract

This study evaluated the fate of Listeria innocua, a non-pathogenic species closely related to Listeria monocytogenes, on Fuji apple fruit surfaces during commercial cold storage with and without continuous low doses of gaseous ozone. Unwaxed Fuji apples of commercially acceptable maturity were inoculated with 6.0-7.0 Log10 CFU L. innocua/apple, and subjected to refrigerated air (RA, 33 °F), controlled atmosphere (CA, 33 °F, 2% O2, 1% CO2), or CA with low doses of ozone gas (50.0 -87.0 ppb ) storage in a commercial facility for 30 weeks. A set of uninoculated apples was simultaneously subjected to the above storage conditions for total plate count and yeasts and molds enumeration. L. innocua survival under RA and CA storage was similar, which led to 2.5-3.0 Log10 CFU/apple reduction during storage. Continuous gaseous ozone application decreased L. innocua population on Fuji apples to ∼1.0 Log10 CFU/apple after 30-week storage, and suppressed apple native flora. CA storage delayed apple fruit ripening through reduction of apple firmness and titratable acidity loss, and low dose gaseous ozone application had no negative influence on apple visual quality, including both external and internal disorders. In summary, L. innocua decre...Continue Reading

Citations

Aug 28, 2020·Frontiers in Microbiology·Meijun ZhuJuming Tang
Feb 21, 2021·Applied and Environmental Microbiology·Blanca Ruiz-LlacsahuangaFaith Critzer
Jul 30, 2021·Comprehensive Reviews in Food Science and Food Safety·Xuetong Fan
Jul 1, 2021·Comprehensive Reviews in Food Science and Food Safety·Lina Sheng, Mei-Jun Zhu

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