It was demonstrated that for certain
polymers and sugars this model leads to a considerable
error in the magnitude of viscosity, particularly 20±30 K
above the Tg. Peleg (1996) further reported that the
upward concavity of changes in a transitional region,
which cannot be predicted by WLF or Arrhenius
equation, can be described by a model with the structure
of FermiÕs function. All the above reports indicate that
although the WLF model has been validated for various
food systems, a general application of this model in a
food system needs to be carefully examined