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http://dx.doi.org/10.3746/jkfn.2014.43.8.1296

Predictive Modeling of Bacillus cereus on Carrot Treated with Slightly Acidic Electrolyzed Water and Ultrasonication at Various Storage Temperatures  

Kim, Seon-Young (Department of Food Science and Biotechnology, School of Bio-convergence Science and Technology, Kangwon National University)
Oh, Deog-Hwan (Department of Food Science and Biotechnology, School of Bio-convergence Science and Technology, Kangwon National University)
Publication Information
Journal of the Korean Society of Food Science and Nutrition / v.43, no.8, 2014 , pp. 1296-1303 More about this Journal
Abstract
This study was conducted to develop predictive models for the growth of Bacillus cereus on carrot treated with slightly acidic electrolyzed water (SAcEW) and ultrasonication (US) at different storage temperatures. In addition, the inactivation of B. cereus by US with SAcEW was investigated. US treatment with a frequency of 40 kHz and an acoustic energy density of 400 W/L at $40^{\circ}C$ for 3 min showed the maximum reduction of 2.87 log CFU/g B. cereus on carrot, while combined treatment of US (400 W/L, $40^{\circ}C$, 3 min) with SAcEW reached to 3.1 log CFU/g reduction. Growth data of B. cereus on carrot treated with SAcEW and US at different temperatures (4, 10, 15, 20, 25, 30, and $35^{\circ}C$) were collected and used to develop predictive models. The modified Gompertz model was found to be more suitable to describe the growth data. The specific growth rate (SGR) and lag time (LT) obtained from the modified Gompertz model were employed to establish the secondary models. The newly developed secondary models were validated using the root mean square error, bias factor, and accuracy factor. All results of these factors were in the acceptable range of values. After compared SGR and LT of B. cereus on carrot, the results showed that the growth of B. cereus on carrot treated with SAcEW and US was slower than that of single treatment. This result indicates that shelf life of carrot treated with SAcEW and US could be extended. The developed predictive models might also be used to assess the microbiological risk of B. cereus infection in carrot treated with SAcEW and US.
Keywords
Bacillus cereus; ultrasonication; slightly acidic electrolyzed water; growth model; carrot;
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Times Cited By KSCI : 8  (Citation Analysis)
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