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Eyring-Polanyi versus Exponential Model for Chemical Reactions

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data generation model
Eyring-Polanyi
exponential
n
3
4
5
6
7
8
9
10
T
min
(°C)
25.
T
max
(°C)
75.
model parameters
T
ref
(°C)
35.
c (°
-1
C
)
0.025
b (°C)
273.16
a (°C)
4000.
The temperature dependence of the rate of chemical reactions and biological processes is frequently described by the Arrhenius equation. A recently introduced alternative in food research is the Eyring–Polanyi model, adapted from chemical kinetics. It is shown here that there are many conditions in which data generated with a simpler exponential model can be fitted with the Eyring–Polanyi model and vice versa. This suggests that an Eyring–Polanyi model is not sufficient to definitively establish the existence of a temperature-independent "free energy of activation" in food processes and reactions unless the presence of an activated state can be confirmed independently.
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