Food Safety Engineering by Unknown

Author:Unknown
Language: eng
Format: epub
ISBN: 9783030426606
Publisher: Springer International Publishing

(14.11)

Later, Zwietering et al. (1996) proposed an enhanced version of the Square Root model, which was also named as the Gamma model:

(14.12)

where Tmin is defined as a hypothetical temperature, which is the point at which the line of the square root of growth rates intercepts the temperature axis (Heitzer et al. 1991; Huang et al. 2011; Ratkowsky et al. 2005). Many researches showed that Tmin estimated by the Square Root model is lower than the true minimum growth temperature (Baranyi et al. 1995; Huang 2011; Juneja et al. 2009; Stannard et al. 1985). Therefore, it is necessary to close the gap between the model-calculated Tmin and measured Tmin. Huang (2010) used a Bělehrádek-type model (Eq. 14.9) to develop a nonlinear regression equation to describe the relationship between growth rate of Escherichia coli O157:H7 in beef and growth temperature and the results demonstrated that the Tmin estimated by the new model was better than Ratkowsky Square Root model. However, Ross et al. (2011) disagreed that this new model is more suitable than the traditional Square Root model, so more research is needed in the future to make this model more encompassing of and truer to the real world conditions.

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