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2005
Journal Article
Titel
Application of stir bar sorptive extraction (SBSE) for migration testing of food packaging materials
Abstract
Magnetic stir bars coated with polydimethylsiloxane (PDMS) were applied for sorption of migration-relevant compounds in food packaging contact media. The loaded stir bars were re-extracted with solvents as well as by thermal desorption. A mix of polar and non-polar compounds relevant for migration testing at concentrations of 1 and 0.1 ppm respectively were used for method development. The PDMS stir bar extraction method was optimized in terms of sorption time, sample volume, re-extraction conditions and NaCl and ethanol concentration. As a result the recoveries determined for each compound were lower than calculated. The limits of detection were between 1 and 100 ppb and the reproducibility of the method was estimated for the investigated compounds between 3 and 49 %. NaCl or ethanol addition did not increase the recovery rates. In comparison to alternative extraction methods (e.g. LLE or SPE) the SBSE method showed lower recoveries especially for polar compounds. However, the detection limits were sufficient for migration testing. Due to fact that the developed SBSE method is time efficient this method will be interesting for routine migration testing of food packaging materials.
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