Determination of phthalates in milk and milk products by liquid chromatography/tandem mass spectrometry

Rapid Communications in Mass Spectrometry : RCM
Lambert K Sørensen

Abstract

A liquid chromatographic/tandem mass spectrometric method using pneumatically assisted electrospray ionisation (LC/ESI-MS/MS) was developed for determination of dibutyl phthalate (DBP), benzyl butyl phthalate (BBP), di-2-ethylhexyl phthalate (DEHP), di-'isononyl' phthalate (DINP) and di-'isodecyl' phthalate (DIDP) in milk and milk products including infant formulas. The phthalates were extracted by a mixture of tert-butyl methyl ether and hexane from liquid samples. DBP, BBP and DEHP were removed from fats by liquid/liquid extraction into acetonitrile while DINP and DIDP were cleaned up on deactivated silica. The phthalates were detected in positive ion mode after separation on a reversed-phase C5 analytical column. Two transition products were monitored for each compound. The detection limits related to the transition products of lowest abundance were in the range 5-9 microg/kg.

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