3.1.3. Case study 1.3 water activity aw
As for temperature, the mmax(aw)-relation is not symmetrical.
When only the sub-optimal aw-region is considered, Mertens et al.
(2012) proved that even two aw levels can yield an accurate rela-
tion. However, by including the super-optimal water activity range,
the relation becomes asymmetric, analogously to the CTMI model.
Therefore, it can be expected that similar conclusions can be drawn
for this model.
Again, an equidistant design is compared with an OED/PE-based
design. In Bernaerts et al. (2005) no discussion about the mmax(aw)-
relation is included. However, as the aw-model structure is identical
to the CTMI, a design can be constructed as for the CTMI, i.e., two
experimental levels in the super-optimal region, one value slightly
below the expected awopt and one value approx. halfway the sub-
optimal region. The equidistant and OED/PE-based approaches
are compared using simulation studies. Values for the model
parameters are extracted from Sautour et al. (2001) in which the
effect of water activity on the growth of food-related molds is
studied. In this case, the increase in the mold surface as a function
of time and aw is investigated and modeled.
3.1.3. Case study 1.3 water activity aw
As for temperature, the mmax(aw)-relation is not symmetrical.
When only the sub-optimal aw-region is considered, Mertens et al.
(2012) proved that even two aw levels can yield an accurate rela-
tion. However, by including the super-optimal water activity range,
the relation becomes asymmetric, analogously to the CTMI model.
Therefore, it can be expected that similar conclusions can be drawn
for this model.
Again, an equidistant design is compared with an OED/PE-based
design. In Bernaerts et al. (2005) no discussion about the mmax(aw)-
relation is included. However, as the aw-model structure is identical
to the CTMI, a design can be constructed as for the CTMI, i.e., two
experimental levels in the super-optimal region, one value slightly
below the expected awopt and one value approx. halfway the sub-
optimal region. The equidistant and OED/PE-based approaches
are compared using simulation studies. Values for the model
parameters are extracted from Sautour et al. (2001) in which the
effect of water activity on the growth of food-related molds is
studied. In this case, the increase in the mold surface as a function
of time and aw is investigated and modeled.
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