Factors affecting migration kinetics from a generic epoxy-phenolic food can coating system

• Published in: Food research international Vol. 106; pp. 183 - 192
• Main Authors: Wagner, Janine, Castle, Laurence, Oldring, Peter K.T., Moschakis, Thomas, Wedzicha, Bronislaw L.
• Format: Journal Article
• Language: English
• Published: Canada Elsevier Ltd 01-04-2018
• Subjects: Activation energy; Can coating; Curing time; Diffusion coefficient; Film thickness; Model migrants; Simulant temperature; Curing time; Model migrants; Simulant temperature; Film thickness; Diffusion coefficient; Activation energy; Can coating
• ISSN: 0963-9969; 1873-7145
• DOI: 10.1016/j.foodres.2017.12.059

This study investigated how the properties of a polymeric can coating film, such as thickness and crosslink density as well as the type of migrant, influence the migration kinetics of model migrants in an attempt to better understand, model and control the migration process. Four model migrants were used BADGE (bisphenol A diglycidyl ether), BADGE·H2O, cyclo-diBADGE and Uvitex OB, that differ in size and polarity. Fatty and aqueous food simulants were used at high temperatures (70–130°C). The apparent diffusion coefficients were found to decrease with increasing crosslink density, while they increased with increasing film thickness. The apparent activation energy of BADGE and BADGE-related compounds was calculated from the diffusion data and were high, in the range of 250–264kJmol−1. The polarity of the simulant and the polarity of the migrant were found to influence migration. The results can be used to improve existing migration models, and thereby help to reduce migration from packaging into food by using safety-by-design approaches in new product development.
[Display omitted]
•Migration rate of model migrants increases with increase in coating thickness.•Migration rate decreases with increase in crosslink density of the can coating.•Migration rate decreases with increasing molecular weight of the model migrants.•Activation energy of migration of BADGE and BADGE-related compounds is high.