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Influence of heating source on the migration of photoinitiators from packaging materials into Tenax® and popcorn

Ji, Shuilin, Zhang, Juzhou, Tao, Gushuai, Peng, Chuanyi, Sun, Yue, Hou, Ruyan, Cai, Huimei
Food packaging and shelf life 2019 v.21 pp. 100340
benzophenones, diffusivity, dried foods, food packaging, food safety, heat, microwave treatment, models, packaging materials, paper, popcorn, shelf life, tandem mass spectrometry, temperature
The migration behaviors of the photoinitiators (PIs) benzophenone (BP), 4-methyl benzophenone (4-MBP), 2-methyl-4′-(methylthio)-2-morpholinopropiophenone (Irgacure 907), and 2-ethylhexyl-4-(-dimethylamino) benzoate (EHA) from coated paper to the dry food simulant Tenax® was quantified by UPLC-MS/MS. The migration of the PIs to the food simulant were: BP > MBP > EHA > Irgacure 907 under both conventional and microwave heating. Microwave heating could accelerate the rate of migration of four photoinitiators compared to conventional heating in a short time. However, at migration equilibrium, the maximum migration of the PIs under microwave heating was lower than under conventional heating. Using the determined migration data, Crank monolayer migration models based on Fick's second law were established for the PIs. The partition coefficient (KPF) of each photoinitiator was negatively correlated with temperature, for both heating sources (conventional and microwave heating). The diffusion coefficients (Dp) were positively correlated with temperature under conventional heating. At higher temperature, the KPF values were smaller and the Dp values were large for each of the four PIs. All PIs were detected in the popcorn after microwave heating. These results showed that the heating method does impact food safety.