As expected, for all conditions, the control oil sample (film with
no-additive) was the most affected by the oxidizing atmosphere.
The soybean oil with the 1 wt.% antioxidant film showed an
improvement in oil stability, and the protective effect was more
evidenced in the films containing 2 and 5 wt.% of additive, with
no significant differences among these concentrations in both
cases (BHT and a-tocopherol). Under the studied conditions, for
each additive, a 2 wt.% concentration in the film was enough to
provide the best antioxidant effect. Unless otherwise stated, the
results for the films are expressed with this percentage of additive