Search for a more adequate test to predict the long-term migration from the PVC gaskets of metal lids into oily foods in glass jars

Authors: Graubardt, Nadine¹; Biedermann, Maurus¹; Fiselier, Katell¹; Bolzoni, Luciana²; Pedrelli, Turno²; Cavalieri, Chiara²; Simoneau, Catherine³; Grob, Koni¹

Source: Food Additives and Contaminants, Volume 26, Number 7, July 2009 , pp. 1113-1122(10)

Publisher: Taylor and Francis Ltd

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Abstract:

As shown previously, the conventional testing procedure for simulating long-term migration from the gaskets of metal closures into oily foods does not adequately reflect reality. It appears to be impossible to accelerate migration to the extent that the situation at the end of the shelf life of a product can be anticipated in a few days or weeks. Therefore, we investigated whether long-term migration could be extrapolated from migration rates determined for new lids. Jars were kept in the normal upright position. Since heat treatment may have a strong temporary impact, migration during the initial heating for pasteurization or sterilization and storage at ambient temperature were determined using different lids. Commercial products were recalled from sales points throughout Europe to determine the real migration over extended periods of time and for jars with differing histories. This migration was compared with data from the short-term testing to investigate whether an empirical relationship could be derived. The results show that the short-term test enables the comparison of lids and plasticizers in the initial phase of migration, but that long-term extrapolation presupposes more complex kinetic modeling. The results also demonstrate that the legal relevance of “official” testing methods should be reconsidered to avoid conflict when food contact materials comply with migration limits in the test but not in actual application.

Keywords: gaskets; metal closures; oily food; glass jars; migration testing; PVC plasticizers; official methodology

Document Type: Research article

DOI: http://dx.doi.org/10.1080/02652030902894405

Affiliations: 1: Official Food Control Authority of the Canton of Zurich, CH-8032 Zurich, Switzerland 2: Stazione Sperimentale Industria Conserve Alimentari (SSICA), I-43100 Parma, Italy 3: European Commission, Joint Research Centre, Italy

Publication date: 2009-07-01

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Search for a more adequate test to predict the long-term migration from the PVC gaskets of metal lids into oily foods in glass jars

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