Modelling the Survival of Escherichia coli O157:H7 on Raw Portioned Tomatoes, Inoculated with Aspergillus fumigatus and Emericella nidulans

Table 1

Death kinetics of E. coli O157:H7 on tomatoes preinoculated with E. nidulans DSMZ 820 and A. fumigatus DSMZ 819 and packaged in air: fitting parameters of the log linear + shoulder model.

	SL	𝑘max	log𝑁0	𝑅^2	RMSSE
E. nidulans
4^∘C	7.07 ± 0.49^A	0.97 ± 0.25^A,B	4.58 ± 0.05^A	0.964	0.088
8^∘C	5.02 ± 0.64^B	0.71 ± 0.12^A,B	4.61 ± 0.05^A	0.986	0.079
12^∘C	2.47 ± 0.79^C	0.60 ± 0.07^A	4.67 ± 0.07^A	0.991	0.086
A. fumigatus
4^∘C	2.95 ± 0.18^C	0.51 ± 0.10^A	4.75 ± 0.08^A	0.981	0.099
8^∘C	2.91 ± 0.22^C	0.59 ± 0.12^A	4.75 ± 0.10^A	0.977	0.125
12^∘C	3.52 ± 0.18^C	0.76 ± 0.15^A,B	4.72 ± 0.11^A	0.974	0.159
Control
4^∘C	1.09 ± 1.00^D	1.55 ± 0.27^B	4.76 ± 0.52^A	0.959	0.580
8^∘C	0.29 ± 0.16^D	1.42 ± 0.26^A,B	4.78 ± 0.62^A	0.949	0.640
12^∘C	0.59 ± 0.19^D	1.46 ± 0.24^A,B	4.77 ± 0.53^A	0.961	0.558

^∗SL, shoulder length, is time before the beginning of the death phase of E. coli O157:H7 (days); 𝑘_max: maximal death rate (log(cfu/g)/day); log𝑁₀: initial cell number of E. coli O157:H7 (log cfu/g); 𝑅²: regression coefficient; RMSSE: root mean sum of squared error.
^A,BThe letters indicate the significant differences in a column: values with different superscripts are significantly different (𝑃<.05) (one-way ANOVA and Tukey’s test).