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SFC-FTIR Spectroscopy and SFC-MS of Nonvolatile Extractants of Microwave Susceptor Packaging

Microwave susceptor packaging is designed to brown and crisp food in a microwave oven. During microwave cooking, the package can reach temperatures above 260 o C. Because of these high temperatures and the multilayer construction of the packages, many types of chemicals can potentially migrate into the food. Supercritical fluid chromatography (SFC) using Fourier-transform infrared (FTIR) spectroscopy in series with flame-ionization detection provides a unique solution to the simultaneous determination of both aromatic and aliphatic nonvolatile compounds. We demonstrate the utility of SFC for determining these potential migrants in solvent extracts of several microwave susceptor packaging materials. The extract of one package studied contained 2-(2-butoxyethoxy)ethanol and several aliphatic chemicals whose FTIR and mass spectra are characteristic of aliphatic ketones