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The determination of monomers and oligomers from polyester-based can coatings into foodstuffs over extended storage periods.

Food additives & contaminants. Part A, Chemistry, analysis, control, exposure & risk assessment (2018-02-24)
Malcolm Driffield, Monica Garcia-Lopez, Julie Christy, Antony Stephen Lloyd, Jonathan Andrew Tarbin, Patrick Hough, Emma Louise Bradley, Peter Kenneth Thomas Oldring
ABSTRACT

The polymeric coating used in metal packaging such as cans for foods and beverages may contain residual amounts of monomers used in the production of the coating, as well as unreacted linear and cyclic oligomers. Traditionally, although designed for use with plastic food contact materials, food simulants have been used to determine the migration of monomers from coatings into foodstuffs. More recently, food simulants have also been used to determine oligomeric species migrating from can coatings. In the work reported here, the migration of both monomers and oligomers from polyester-based can coatings into food simulants and foodstuffs, some of which were towards the end of their shelf-life, is compared. The concentrations of monomers and selected oligomers in canned foods at the end of their shelf life were found to be significantly lower than those in food simulants, which in turn was lower than those in the extraction solvent acetonitrile.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
cis-5-Norbornene-endo-2,3-dicarboxylic anhydride, 99%
Sigma-Aldrich
cis-5-Norbornene-exo-2,3-dicarboxylic anhydride, 95%
Sigma-Aldrich
cis-5-Norbornene-endo-2,3-dicarboxylic acid, 98%