From Additive Migration from Plastics into Foods: A Guide for Analytical Chemists

This approach involves a direct determination of substances in the packaged food that have migrated from the polymer. This is perhaps not a very appealing approach as it involves determination of migrants in what are often very complex foodstuff matrices presenting great analytical difficulties. Neither is this approach discussed to any great extent by the various regulatory bodies such as the European Union (EU) or the Food and Drug Administration (FDA).

Therefore, the subject is not discussed extensively in this book and what follows is not a complete coverage of the subject. Nevertheless it is included here as it may appeal to some commodity packagers as a means of quality control of their product. This, of course, does not exempt the supplier of additives or the food package from attaining the necessary official approvals,

17.1 Antioxidants

Hartman and Rose [1] described a rapid gas chromatographic (GC) method for the determination of butylated hydroxy anisole ( t-butyl-4-methoxyphenol; BHA) and butylated hydroxy toluene (2,6-di- t-butyl- p-cresol; BHT) in vegetable oils. To 2.5 g of oil was added 150 ?g of methyl undecanoate (as internal standard) in 5 ml of carbon disulfide, this was then diluted to 25 ml with carbon disulfide. A 3 to 7 ?l aliquot was analysed by GC on an aluminium column (1.8 m 4.5 mm) or a glass column (1.8 m 4 mm) containing 10% of DC200 on gas chrom Q (80 to 100 mesh), operated at 160 C with helium...

Products & Services
Food Additives
Food additives include flavoring extracts, syrups, emulsifiers, anti-oxidants, fortifiers and other substances that are added to food products to enhance processing, texture, flavor or other characteristics.
Oil in Water Monitors
Oil in water monitors are used to detect the presence of hydrocarbons in water.
GC Columns
Gas chromatography columns (GC columns) are of two types: packed and capillary. Solutes to be measured travel through the column at a rate primarily determined by their physical properties, and the temperature and composition of the column.
Anti-seize Compounds
Anti-seize compounds, anti-stick compounds, and thread lubricants are applied to threads to prevent binding or sticking bolts or fasteners.
GC Detectors
Gas chromatography detectors (GC detectors) identify solutes as they exit the chromatographic column. A chromatogram is generated plotting the signal versus time.

Topics of Interest

1H-NMR Proton nuclear magnetic resonance AAS Atomic absorption spectoscopy ABS Acrylonitrile butadiene - styrene AES Atomic emission spectrometry APCI Atmospheric pressure chemical ionisation ATR-FTIR...

2.10 Solvent Extraction Visible Spectroscopy 2.10.1 Phenol Antioxidants A very popular method of estimating antioxidants in polymer extracts is by coupling or oxidising them to form coloured products...

[concs] Concentrations AAS Atomic absorption spectrometry ABS Acrylonitrile-butadiene-styrene AC Alternating current AC Atomic composition AED Atomic emission detector AFS Atomic fluorescence...

The analysis of additives in polymers has been reviewed by several workers [1, 2]. A variety of analytical techniques have been considered. 7.1 IR and Raman Spectroscopy 7.1.1 Instrumentation Further...

2.9 Solvent Extraction Ultraviolet Spectroscopy Straightforward UV spectroscopy is liable to be in error because of interference by other highly absorbing impurities that may be present in the sample...