CuO nanoparticles (CuO-NPs) is believed to be an efficient functional agent, which can be used in food packaging to enhance the barrier, mechanical and antibacterial property. However, an excessive dose of CuO-NPs could be harmful to human health. This paper focused on the effects of contents of CuO-NPs, temperature, immersion time, UV irradiation and circular usage have on its migration to 5 g/L citric acid by inductively coupled plasma-optical emission spectrometry (ICP-OES). The migration mechanism of CuO-NPs was studied via fourier transform infrared spectroscopy (FTIR), differential scanning calorimeter (DSC), scanning electron microscopy (SEM). The results showed that the migration of copper in the four nanocomposite films were 5.92-33.83 μg/dm2 at 70 ℃ for 2-24 hours. The migration amount increased with the increase of migration time. Ultraviolet irradiation caused the photodegradation of the CuO nanocomposite films, which significantly increased the amount of migration in the CuO nanocomposite films. Citric acid could penetrate the material through defects and holes on the surface of the film, dissolving and facilitating the migration of CuO-NPs.
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