3. Results and discussion
3.1. Headspace gas composition
Results showed that for chocolate packaged in PET//LDPE the N2
concentration fell below 98.1% after 2 months exposure of the product
to O2 while in the presence of the oxygen absorber the N2
concentration reached 99.1% after 12 months of storage (data not
shown). On the other hand the high barrier material PET-SiOx//LDPE
even after 12 months of storage retained a N2 concentration above or
equal to 99.8% while in the presence of the oxygen absorber the N2
concentration remained equal to 100% throughout storage, effectively
protecting the product from oxidation