Identification of non volatile migrant compounds and NIAS in polypropylene films used as food packaging



Migration of non volatile compounds from twenty six PP films used as food contact materials has been studied in four simulants (ethanol 95% and 10%, acetic acid 3% and Tenax ®) and analyzed by UPLC-MS/QTOF. Seventy six compounds have been identified, where 76% of them were non-intentionally added substances (NIAS) coming from degradation of additives used, such as methyl or ethyl or hexyl-3-(3,5-di-tert-butyl-4-hydroxyphenyl) from irganox 1076 and irganox 1010 degradation; or impurities such as N,N-bis(2-hydroxyethyl) amines, or compounds of unknown origin, like hydro-ceramides. The most common compounds found were glyceryl monostearate or monopalmitate, erucamide, irganox 1010, irgafos 168, irgafos 168 OXO, N,N-bis(2-hydroxyethyl) tridecylamine and N,N-bis(2-hydroxyethyl) pentadecylamine.

Six films didn’t comply with the European Regulation Nº 10/2011/EU, where irganox 1010 and the group of N,N-bis(2-hydroxyethyl) amines exceeded their SMLs. Other films surpassed the maximum concentration recommended by Cramer for the compounds of class II (degradation products) or III (amide compounds) when ethanol 95% was used as simulant.

                   

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