Migration of Ti from nano-TiO₂-polyethylene composite packaging into food simulants

Abstract

An analytical method based on ICP-MS was developed for the determination of Ti in food simulants (3% (w/v) aqueous acetic acid and 50% (v/v) aqueous ethanol). The method was used to determine the migration of Ti from nano-TiO₂-PE films used for food packaging into food simulants under different temperature and migration time conditions. The maximum migration amounts into 3% (w/v) aqueous acetic acid were 1.4 ± 0.02, 6.3 ± 0.5 and 12.1 ± 0.2 μg kg⁻¹ at 25, 70 and 100°C, respectively, while into 50% (v/v) aqueous ethanol, the maximum migration amounts were 0.5 ± 0.1, 0.6 ± 0.03 and 2.1 ± 0.1 μg kg⁻¹ at 25, 70 and 100°C, respectively. Increasing the additive content in the film promoted migration of nanoparticles. The results indicated that the migration of nanoparticles might occur via dissolution from the surface and cut edges of the solid phase (film) into the liquid phase (food simulant).

Graphical Abstract

Keywords:

• metals analysis – ICP/MS
• packaging
• packaging additives
• migration
• food simulants

Funding

This work was supported by the National Natural Science Foundation of China [grant number 21277085], [grand number 21277061]; the National Science and Technology Support Program [grant number 2011BAK10B05-03]; and the Science and Technology Research Project of Shanxi Province [grant number 20120313030-3].