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Dynamic model to describe kinetic behavior of Listeria monocytogenes in smoked salmon

Authors
Kang, JoohyunOh, HyeminLee, YewonLee, HeeyoungLee, SoominKim, SejeongHa, JimyeongChoi, YukyungKim, YujinSeo, YeongeunPark, EunyoungKim, HyunjungYoon, Yohan
Issue Date
Oct-2021
Publisher
WILEY
Citation
JOURNAL OF FOOD SAFETY, v.41, no.5
Journal Title
JOURNAL OF FOOD SAFETY
Volume
41
Number
5
URI
https://scholarworks.sookmyung.ac.kr/handle/2020.sw.sookmyung/146359
DOI
10.1111/jfs.12925
ISSN
0149-6085
1745-4565
Abstract
In this study, the dynamic model was developed to describe cell counts of Listeria monocytogenes in smoked salmon under distribution conditions. A 9-strain mixture of L. monocytogenes was inoculated in smoked salmon at 3-4 Log CFU/g. The inoculated samples were stored at 4 degrees C, 10 degrees C, and 20 degrees C for up to 16 days, and the bacterial cell counts were enumerated on PALCAM agar. The Baranyi model was fitted to the L. monocytogenes cell counts to calculate the lag phase duration (LPD; hr) and maximum growth rate (mu(max); Log CFU/g/hr). LPD was 74.22 hr at 4 degrees C, and the value was rapidly decreased to 4.84 hr at 20 degrees C as temperature increased. mu(max) ranged from 0.01 to 0.13 Log CFU/g/hr, depending on the storage temperature. The kinetic parameters were fitted with secondary models as a function of temperature. Cell counts predicted by the developed model were compared with the predicted cell counts obtained at 8 degrees C and 15 degrees C, and the differences between predicted and observed cell counts were indicated by root mean square error (RMSE). The dynamic model was then developed with the kinetic parameters derived from the secondary model and simulated the L. monocytogenes growth. RMSE (0.368) indicates that the model performance was appropriate. These results suggest that the developed kinetic models can be useful in predicting the fates of L. monocytogenes in smoked salmon under the dynamic conditions of storage temperature and time.
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생활과학대학 (식품영양학과)
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