Evaluation of Different Conditions of Contact for Caprolactam Migration from Multilayer Polyamide Films into Food Simulants

摘要

Caprolactam, the polyamide 6 (PA-6) monomer, can migrate during food processing. At cooking temperatures, migration is accelerated and plastic components could degrade, giving off low molecular mass compounds, which can migrate into food. In this work, caprolactam migration from multilayer films containing PA-6 for meat foodstuffs and cheese packaging was performed at contact conditions of 40℃/10 days and 100℃/30 min. The migration into water ranged from 0.89 to 1.22 mg/dm~2 and 0.92 to 1.21 mg/dm~2, into 3% acetic acid from 1.29 to 1.74 mg/dm~2 and 1.13 to 1.62 mg/dm~2 and into olive oil from 1.18 to 1.98 mg/dm~2 and 0.50 to 0.80 mg/dm~2 for films intended for meat foodstuffs for 10 days at 40℃ and 30 min at 100℃, respectively. Among PA-6 films used for cheese, caprolactam migration into water ranged from 0.17 to 0.91 mg/dm~2 and 0.74 to 1.04 mg/dm~2, into 3% acetic acid from 1.15 to 1.26 mg/dm~2 and 1.11 to 1.37 mg/dm~2 and into olive oil from 0.23 to 0.83 mg/dm~2 and 0.37 to 0.56 mg/dm~2 for 10 days at 40℃ and 30 min at 100℃, respectively. Caprolactam migration evaluation into water and 3% acetic acid at 100℃/30 min could replace the need to apply the test at 40° C/10 days, since similar results were obtained under both conditions. In the case of PA-6 for meat foodstuffs, caprolactam migration into olive oil was highly affected by different conditions of contact, showing values two to three times higher at 40℃/10 days than at 100℃/30 min. For cheese films, caprolactam migration into olive oil was higher at 40℃ for 10 days.