Aqueous foods simulants

Part 28 Determination of 1,1,1-trimethylolpropane (TMP) in food simulants Aqueous food simulants are saturated with potassium carbonate and extracted with ethanol/ethyl acetate. After evaporation of solvent the extracted TMP is silyated with trimethylsilylimidazole in pyridine and determined by GC with flame ionisation detection... 

Butadiene, CH2=CH-CH=CH2 (CAS No. 106-99-0 PM/Ref. No. 13630) is commonly copolymerized with styrene and acrylonitrile to make ABS or BS food contact plastics (for applications see acrylonitrile). Butadiene is a suspected carcinogen with extreme volatility (bp -4.5 °C) and low water solubility. This makes it very difficult to handle migration and calibration samples where the matrix is of highly aqueous character such as the aqueous food simulants. 

Table 10-5 Hydrolysis of BADGE in aqueous food simulants at 40 °C.

Therefore, the scope of the method seems to be limited only to very short and mild contact conditions in the case of aqueous food simulants, but the method is fully applicable to olive oil and other oils or fats as well as to non-proton-active alternative simulants such as iso-octane. 

The EU limit of the overall migration is 10 mg/dm or 60 mg/kg. Because olive oil is a severe solvent compared with most fatty foods, a reduction factor ranging from 2-5 may be applied depending on the food. Chocolate has, for example, a reduction factor of 5, which means that the value obtained for the overall migration into simulant D must be divided by 5 before checking it against the limit (Directive 85/572/EEC). Eurthermore, it should be kept in mind that analytical error in the determination of the overall migration was determined by the EU as 2 mg/dm or 12 mg/kg for the aqueous food simulants (A, B and C), whilst the error is 3 mg/dm or 20 mg/kg for the fatty food simulant (D). 

Materials and articles in contact with foodstuffs - Plastics - Part 2 Test methods for overall migration into ohve oil by total immersion Materials and articles in contact with foodstuffs - Plastics - Part 3 Test methods for overall migration into aqueous food simulants by total immersion... 

Part 5 Test methods for overall migration into aqueous food simulants by cell. 

Co-authors of these studies have recently published a method for the specific determination of 20 primary aromatic amines in aqueous food simulants by liquid chromatography-electrospray ionisation-tandem mass spectrometry... 

Polypropylene Aqueous food-simulating solvents Capillary SEC. Column 10 m x 50 mm i.d. SB-Biphenyl-30, 0.25-pm film. Mobile phase = CO2, linear flow rate 3 cm/sec. Pressure program, 100-400 bar temperature program, 55-100°C. 1-pL injection using solvent venting with gas purging. Retention gap was 1.8 m x 100 pm deactivated fused silica. Detection by FID and MS. Pentaerythrityl-tetrakis((3-(3,5-di-rert-butyl-4-hydroxy-phenyl) propionate) (V,A -bis(2-hydroxyethyl)-C 12.C14-amine) Tris-2,4-di-tert-butylphenyl)phosphite 32... 

---