When the antioxidant capacity of the films obtained is
taken into account, as well as the antioxidant capacity of
the antioxidants, the antioxidant concentration in the films
can be inferred. When comparing the calculated antioxidant
concentration in the film (as concentration initially added to
the film), significant differences have been observed. One
of the main reasons is the reduction due to the
manufacturing process. High temperature conditions during
the extrusion process are one of the reasons for antioxidant
degradation or evaporation. Some studies have demonstrated
casting processes that produce materials with less
loss of antioxidant in the film with respect to the nominal
content owing to less aggressive processing and manufacture
conditions (Lopez-de-Dicastillo et al., 2010). Consequently,
the final antioxidant activity of the films should
be calculated once the film is obtained.