This was probably due to the reduced moisture content of the films, equilibrated at low RH conditions, which promoted a reduced OP and masked the actual role of antioxidant additives.
Another approach for testing the antioxidant activity in standalone films was reported by Nerin et al. (2008). The test film, enriched with a natural volatile antioxidant, was hanged in the headspace of a glass jar containing a solution of a highly oxidized compound that mimics a real food system, thus avoiding the direct contact with the film. In this way, the antioxidant capacity of the volatile compounds incorporated in the film was tested, and the oxygen barrier effect of the film was not considered. In this way, the antioxidant activity was achieved by scavenging oxygen radicals rather than by protecting from oxygen. This methodology was initially described for polypropylene films. However, it can be potentially used for assessing the antioxidant capacity of edible materials enriched with antioxidants, as long as the film matrix allows for some release of the active additives.
This was probably due to the reduced moisture content of the films, equilibrated at low RH conditions, which promoted a reduced OP and masked the actual role of antioxidant additives. Another approach for testing the antioxidant activity in standalone films was reported by Nerin et al. (2008). The test film, enriched with a natural volatile antioxidant, was hanged in the headspace of a glass jar containing a solution of a highly oxidized compound that mimics a real food system, thus avoiding the direct contact with the film. In this way, the antioxidant capacity of the volatile compounds incorporated in the film was tested, and the oxygen barrier effect of the film was not considered. In this way, the antioxidant activity was achieved by scavenging oxygen radicals rather than by protecting from oxygen. This methodology was initially described for polypropylene films. However, it can be potentially used for assessing the antioxidant capacity of edible materials enriched with antioxidants, as long as the film matrix allows for some release of the active additives.
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