Survival curves of heated bacterial spores:: effect of environmental factors on Weibull parameters
Survival curves of heated bacterial spores:: effect of environmental factors on Weibull parameters
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DOI：
10.1016/j.ijfoodmicro.2004.10.048
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发表时间：
2005-05-01
影响因子：
5.4
通讯作者：
Leguérinel, I
中科院分区：
文献类型：
--
作者：
Couvert, O;Gaillard, S;Leguérinel, I
经典的一阶失活动力学d值不适用于非对数线性生存曲线中细菌耐热性的量化。一个由威布尔累积函数导出的简单模型描述了微生物的非对数线性动力学。研究了环境因素对威布尔模型参数形状参数“p”和尺度参数“delta”的影响。本文指出了这两个参数之间的结构相关性。环境加热和回收条件对参数“p”的形状没有明确和规则的影响，任何模型都无法描述，相反，尺度参数“delta”取决于加热温度和加热和回收介质ph。为量化这些对经典“D”值的影响而建立的模型可以应用于参数“delta”。形状参数p变化对这些模型的拟合优度的轻微影响可以忽略，对于给定微生物种群具有恒定p值的简化威布尔模型可以应用于罐装过程计算。(c) 2004 Elsevier B.V.版权所有
The classical D-value of first order inactivation kinetic is not suitable for quantifying bacterial heat resistance for non-log linear survival curves. One simple model derived from the Weibull cumulative function describes non-log linear kinetics of micro-organisms. The influences of environmental factors on Weibull model parameters, shape parameter "p" and scale parameter "delta", were Studied. This paper points out structural correlation between these two parameters. The environmental heating and recovery conditions do not present clear and regular influence on the shape the parameter "p" and could not be described by any model tried, Conversely, the scale parameter "delta" depends on heating temperature and heating and recovery medium pH. The models established to quantify these influences on the classical "D" values could be applied to this parameter "delta". The slight influence of the shape parameter p variation on the goodness of fit of these models can be neglected and the simplified Weibull model with a constant p-value for given microbial population can be applied for canning process calculations. (c) 2004 Elsevier B.V. All rights reserved.