Cronobacter sakazakii growth prediction in Reconstituted Powdered Infant Formula Milk

被引:2
作者
Pina-Perez, Maria C. [1 ]
Rodrigo, Dolores [1 ]
Martinez, Antonio [1 ]
机构
[1] IATA CSIC, Dept Food Qual & Preservat, Valencia 46980, Spain
来源
ARCHIV FUR LEBENSMITTELHYGIENE | 2012年 / 63卷 / 06期
关键词
Infant Formula Milk (IFM); Cronobacter sakazakii; growth; predictive microbiology; temperature; LAG PHASE DURATION; ENTEROBACTER-SAKAZAKII; LISTERIA-MONOCYTOGENES; BACTERIAL-GROWTH; BACILLUS-CEREUS; SODIUM-CHLORIDE; TEMPERATURE; MODEL; PH; RESISTANCE;
D O I
10.2376/0003-925X-63-168
中图分类号
O69 [应用化学];
学科分类号
081704 ;
摘要
In the present study, a detailed knowledge of the growth behaviour of Cronobacter sakazakii (858 CECT), at different temperatures, in Tryptic Soy Broth (TSB) and Reconstituted Powdered Infant Formula Milk (RPIFM), is condensed into mathematical models. Growth kinetic data of C. sakazakii were obtained at four different temperatures: 4, 8, 25 and 37 C. The kinetic data were fitted to Baranyi and Gompertz primary models to determine initial density (N-o), lag time (lambda), maximum growth rate (mu(max)) and maximum population density (N-f). The Gompertz equation provided the best fit for experimental data and was selected as the most suitable primary model to describe the C. sakazakii growth behaviour. The results obtained revealed that the lag phase length was affected by temperature, decreasing with increasing temperature ranging from 101.89 h (8 degrees C) to 0.834 h (37 degrees C) in RPIFM. At the same time, the maximum growth rate (mu(max)) was temperature-dependent, with values of 0.027 ((cfu/ml/h) at 8 degrees C, 0.384 ((cfu/ml)/h) at 25 degrees C, and 0.924 ((cfu/ml)/h) at 37 degrees C for RPIFM. The present study contributes to support the good handling practices recommended by FAO/VVHO after reconstitution of PIFM, and the requirement of thermal/non-thermal treatments after reconstitution, previous to neonatal feeding, to ensure RPIFM microbiological safety.
引用
收藏
页码:168 / 174
页数:7
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