Pathogen Modeling Program Online


Pathogen Modeling Program (PMP) Online

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Overview of Predictive Microbiology

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pH of Selected Foods

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Models >> Bacterium

Bacteria >> Model

The models are based on extensive experimental data of microbial behavior in liquid microbiological media and food.

There can be no guarantee that predicted values will match those that would occur in any specific food system. Before the models could be used in such a manner, the user would have to validate the models for each specific food of interest.

Growth of Listeria monocytogenes in Seafood Salad
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Input Conditions
AerobicAnaerobic Temperature in: °C°F

Temperature
Range: 4.0 to 12.0 °C

Mayonnaise pH
Range: 3.7 to 5.1

Time Duration
Range: 0.0 to 28.0 Days

Time Interval
Range: 0.1 to 2.0 Days

Initial Level of L. monocytogenes on Seafood Components
Range: 0.0 to 7.0 Log(cfu/g)

Level of Concern
Range: 1.0 to 7.0 Log(cfu/g)

Line chart of data points for modeled growth. Also available in a table format beside the chart.

Modeled Growth Parameters
Lag Phase Duration:	45.83 (hours)
Growth Rate:	0.0074 (log(cfu/g)/h)
Generation Time:	40.71 (hours)
Max Population Density:	7.00 (log(cfu/g))
Net Growth (Lag):	1.44 (log(cfu/g))
Net Growth (No Lag):	1.77 (log(cfu/g))
Time to LOC (Lag):	316.32 (hours)
Time to LOC (No Lag):	270.49 (hours)

Source:
Cheng-An Hwang, Mark L. Tamplin. 2004 The influence of mayonnaise pH and storage temperature on the growth of Listeria monocytogenes in seafood salad. International Journal of Food Microbiology V102 p277-285

Modeled Growth
Days	log(CFU/g)
Days	Lag	No Lag
0.00	2.00	2.00
0.10	2.01	2.02
0.20	2.02	2.04
0.30	2.03	2.05
0.40	2.03	2.07
0.50	2.04	2.09
0.60	2.05	2.11
0.70	2.06	2.12
0.80	2.07	2.14
0.90	2.08	2.16
1.00	2.09	2.18
1.10	2.10	2.20
1.20	2.11	2.21
1.30	2.12	2.23
1.40	2.13	2.25
1.50	2.14	2.27
1.60	2.15	2.28
1.70	2.16	2.30
1.80	2.18	2.32
1.90	2.19	2.34
2.00	2.20	2.35
2.10	2.21	2.37
2.20	2.22	2.39
2.30	2.23	2.41
2.40	2.25	2.43
2.50	2.26	2.44
2.60	2.27	2.46
2.70	2.28	2.48
2.80	2.30	2.50
2.90	2.31	2.51
3.00	2.32	2.53
3.10	2.34	2.55
3.20	2.35	2.57
3.30	2.36	2.59
3.40	2.38	2.60
3.50	2.39	2.62
3.60	2.40	2.64
3.70	2.42	2.66
3.80	2.43	2.67
3.90	2.45	2.69
4.00	2.46	2.71
4.10	2.48	2.73
4.20	2.49	2.75
4.30	2.50	2.76
4.40	2.52	2.78
4.50	2.53	2.80
4.60	2.55	2.82
4.70	2.56	2.83
4.80	2.58	2.85
4.90	2.59	2.87
5.00	2.61	2.89
5.10	2.63	2.90
5.20	2.64	2.92
5.30	2.66	2.94
5.40	2.67	2.96
5.50	2.69	2.98
5.60	2.70	2.99
5.70	2.72	3.01
5.80	2.74	3.03
5.90	2.75	3.05
6.00	2.77	3.06
6.10	2.78	3.08
6.20	2.80	3.10
6.30	2.82	3.12
6.40	2.83	3.14
6.50	2.85	3.15
6.60	2.87	3.17
6.70	2.88	3.19
6.80	2.90	3.21
6.90	2.92	3.22
7.00	2.93	3.24
7.10	2.95	3.26
7.20	2.96	3.28
7.30	2.98	3.30
7.40	3.00	3.31
7.50	3.02	3.33
7.60	3.03	3.35
7.70	3.05	3.37
7.80	3.07	3.38
7.90	3.08	3.40
8.00	3.10	3.42
8.10	3.12	3.44
8.20	3.13	3.45
8.30	3.15	3.47
8.40	3.17	3.49
8.50	3.18	3.51
8.60	3.20	3.53
8.70	3.22	3.54
8.80	3.24	3.56
8.90	3.25	3.58
9.00	3.27	3.60
9.10	3.29	3.61
9.20	3.31	3.63
9.30	3.32	3.65
9.40	3.34	3.67
9.50	3.36	3.69
9.60	3.37	3.70
9.70	3.39	3.72
9.80	3.41	3.74
9.90	3.43	3.76
10.00	3.44	3.77

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