Modified atmosphere packaging of CO2 (CO2-MAP) is widely applied in pork industry. The presence of packaging is capable of avoiding secondary contamination of pork; meanwhile, CO2 atmosphere could inhibit the growth of undesirable bacteria. The growth of Listeria monocytogenes individually in pork packed in aseptic air atmosphere was used as control group (TC); the inhibition effect of CO2 on the growth of L. monocytogenes was investigated on the basis of predictive microbiology. The growth curves of L. monocytogenes in CO2-MAP pork at 13 and 25 ℃ were fitted into three different primary models: the Baranyi model, the Logistic model and the Gompertz model. Then, these three primary models were compared by Akaike’s information criteria (AIC) and Bayesian information criteria (BIC). The λ and μmax of L. monocytogenes obtained from the primary model with minimum AIC and BIC were employed to develop Ratkowsky-type model. The results indicated that the Baranyi model was more suitable to describe the growth of L. monocytogenes in CO2-MAP pork than other models. The growth of L. monocytogenes is inhibited by 20% CO2 atmosphere, and the inhibition ability of CO2 on L. monocytogenes increased with increasing CO2 concentrations. Compared with TC, the λ of L. monocytogenes under 80% CO2 atmosphere increased by 1.06 times at 13 ℃ and 2.04 times at 25 ℃; the μmax decreased by 47% at 13 ℃ and 69% at 25 ℃. The effects of CO2 on the λ and μmax of L. monocytogenes were well modeled by Ratkowsky-type model. However, although CO2 atmosphere could retard the growth of L. monocytogenes, the bacterium kept growing gradually and reached high Nmax. More hurdles are needed to inhibit the growth of L. monocytogenes in pork from different aspects.
ZHANG Wenmin
,
DONG Qingli
,
LIU Yangtai
,
XIN Bao
,
QIAN Wenwen
,
REN Xiaomei
,
DUAN Liangliang
. Optimization and establishment of inhibition model of CO2 on Listeria monocytogenes in pork[J]. Food and Fermentation Industries, 2023
, 49(24)
: 220
-227
.
DOI: 10.13995/j.cnki.11-1802/ts.035319
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