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      Migration of copper from nanocopper/LDPE composite films.

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          Abstract

          Three nanocopper/low-density polyethylene (LDPE) composite films were tested in food simulants (3% acetic acid and 10% ethanol) and real food matrices (rice vinegar, bottled water and Chinese liquor) to explore the behaviours of copper migration using ICP-OES and GFAAS. The effects of exposure time, temperature, nanocopper concentration and contact media on the release of copper from nanocopper/LDPE composite films were studied. It was shown that the migration of copper into 10% ethanol was much less than that into 3% acetic acid at the same conditions. With the increase of nanocopper concentration, exposure time and temperature, the release of copper increased. Copper migration does not appear to be significant in the case of bottled water and Chinese liquor compared with rice vinegar with a maximum value of 0.54 μg mL-1 for the CF-0.25# bags at 70°C for 2 h. The presence and morphology of copper nanoparticles in the films and the topographical changes of the films were confirmed by field emission scanning electron microscope (FE-SEM) and atomic force microscope (AFM). In this manner, copper nanoparticles of different morphologies, sizes and distribution were found, and samples with higher nanocopper concentration had a more irregular topography. In the case of Fourier transform infrared spectroscopy (FTIR), no chemical bonds formed between copper nanoparticles and LDPE. Copper nanoparticles were just as physically dispersed in LDPE.

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          Author and article information

          Journal
          Food Addit Contam Part A Chem Anal Control Expo Risk Assess
          Food additives & contaminants. Part A, Chemistry, analysis, control, exposure & risk assessment
          Informa UK Limited
          1944-0057
          1944-0057
          Nov 2016
          : 33
          : 11
          Affiliations
          [1 ] a Department of Food Science and Engineering , Jinan University , Guangzhou , China.
          [2 ] b Key Laboratory of Product Packaging and Logistics of Guangdong Higher Education Institutes , Jinan University , Zhuhai , China.
          [3 ] c Guangdong Inspection and Quarantine Technology Center , Guangzhou , China.
          Article
          10.1080/19440049.2016.1237779
          27636863
          46c049d9-5785-4afd-9886-e92f7e63f042
          History

          Nanocopper,ICP-OES,GFAAS,FTIR,FE-SEM,AFM,migration,food simulant,composite film

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