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I. Steiner, P. Volansky:
"Determination of diphenylphthalate and benzophenone in foodstuffs";
in: "Compilation of analytical methods for model migrants in foodstuffs", P. Paseiro Losada, C. Simoneau, R. Franz (ed.); European Commission, Directorate General, Joint Research Center, Ispra, 2006, EUR 22232 EN, 51 - 66.

An analytical method was developed for the determination of migration levels of diphenyl phthalate and benzophenone into foodstuffs coming into contact with plastics. his protocol describes a method for the determination of diphenyl phthalate and benzophenone in foodstuffs.
The method is appropriate for the quantitative determination of diphenyl phthalate and benzophenone in foodstuffs in approximate analyte concentration range of 0.01 to 5 mg/kg of foodstuffs.
Diphenyl phthalate and benzophenone are extracted from aqueous foodstuffs with dichloromethane at room temperature, the organic phase is separated, dried and filtered. From protein and fat containing foodstuffs the extraction using diethyl ether and petroleum benzine is carried out after HCl treatment of the sample, with subsequent solvent exchange to acetonitrile and hexane. Determination is carried out by means of gas chromatography-mass spectrometry (GC-MS). Quantification is achieved using an internal standard.

http://aleph.ub.tuwien.ac.at/F?base=tuw01&func=find-c&ccl_term=AC06587601

Project Head Ingrid Steiner:
Modellierung der Migration von Kunststoffen in Lebensmittel als ein neues und kostengünstiges Werkzeug zur Abschätzung der Verbraucherbelastung durch Lebensmittelverpackungsmaterialien