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Isolation of Bacillus cereus from Soft Soybean Curd and the Kinetic Behavior of B. cereus Isolates at Changing Temperatures

Authors
Park, EunyoungOh, HyeminKim, SejeongLee, JeeyeonHa, JimyeongChoi, YukyungYoon, Yohan
Issue Date
Sep-2021
Publisher
INT ASSOC FOOD PROTECTION
Keywords
Bacillus cereus; Dynamic model; Isolates; Predictive model; Soft soybean curds
Citation
JOURNAL OF FOOD PROTECTION, v.84, no.9, pp 1555 - 1559
Pages
5
Journal Title
JOURNAL OF FOOD PROTECTION
Volume
84
Number
9
Start Page
1555
End Page
1559
URI
https://scholarworks.sookmyung.ac.kr/handle/2020.sw.sookmyung/146426
DOI
10.4315/JFP-21-026
ISSN
0362-028X
1944-9097
Abstract
In this study, Bacillus cereus was isolated from soft soybean curds, and a dynamic model was developed to describe the kinetic behavior of these isolates during transfer and storage. B. cereus isolates recovered from soft soybean curds were inoculated into soft soybean curd, and the levels were determined during storage at 10 to 308C. The B. cereus counts were fitted to the Baranyi model to calculate maximum growth rate (mu max) and lag-phase duration (LPD). These kinetic parameters were then analyzed with a polynomial equation to evaluate the effects of temperature on the kinetic parameters. The developed model was validated with observed values, and the differences between predicted and observed values were determined by calculating the root mean square error (RMSE). A dynamic model was then developed with a combination of primary and secondary models to describe B. cereus growth under changing temperature conditions. B. cereus was detected in two soft soybean curd samples (5.1%) at 0.7 log CFU/g. The mu maxwas -0.04 to 0.47 log CFU/g/h, and the ln(LPD) was 3.94 to 0.04 h, depending on the storage temperature. The model performance was appropriate with a 0.216 RMSE and accurately described the kinetic behavior of B. cereus in soft soybean curd samples. These results suggest that B. cereus can contaminate soft soybean curds and that the models developed with the B. cereus isolates are useful for describing the kinetic behavior of B. cereus in soft soybean curd.
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