Determination of the overall migration from silicone baking moulds into simulants and food using 1H-NMR techniques.
Different silicone baking moulds (37 samples) were characterized with respect to potential migrating substances using 1H-NMR, RP-HPLC-UV/ELSD and GC techniques. In all cases cyclic organosiloxane oligomers with the formula [Si(CH3)2-O]n were identified (n = 6 ... 50). Additionally, linear, partly hydroxyl-terminated organosiloxanes HO-[Si(CH3)2-O]n-H (n = 7 ... 20) were found in 13 samples. No substances other than siloxanes could be detected, meaning the migrants mainly consist of organopolysiloxanes. Based on this knowledge, a 1H-NMR quantification method for siloxanes was established for the analysis of both simulants and foodstuffs. Validation of the 1H-NMR method gave suitable performance characteristics: limit of detection 8.7 mg kg(-1) oil, coefficient of variation 7.8% (at a level of 1.0 mg kg(-1) food). Migration studies were carried out with simulants (olive oil, isooctane, ethanol (95%), Tenax) as well as preparation of different cakes. From the 1st to 10th experiment, siloxane migration into cakes only slightly decreased, with a significant dependence on fat content. Migration never exceeded a level of 21 mg kg(-1) (3 mg dm(-2)) and was, therefore, well below the overall migration limit of 60 mg kg(-1) (10 mg dm(-2)). However, migration behaviour into simulants differed completely from these results.
Helling
Ruediger
R
Landesuntersuchungsanstalt fur das Gesundheits-und, Dresden, Germany.
Mieth
Anja
A
Altmann
Stefan
S
Simat
Thomas Joachim
TJ
D003296:Cooking / Q000379:methods; D003297:Cooking and Eating Utensils / Q000592:standards*; D004041:Dietary Fats / Q000032:analysis*; D005506:Food Contamination / Q000032:analysis*; D018857:Food Packaging / Q000379:methods; D006358:Hot Temperature; D007881:Legislation, Food / Q000592:standards; D008422:Materials Testing / Q000379:methods; D019906:Nuclear Magnetic Resonance, Biomolecular / Q000379:methods; D012828:Silicones / Q000032:analysis*
D004041:Dietary Fats; D012828:Silicones