73D-23 |
Depth profiling of a heterogeneous food package using Fourier transform infrared photoacoustic spectroscopy (FTIR-PAS) |
H. YANG and J. M. K. Irudayaraj. Dept. of Agricultural & Biological Engineering, The Pennsylvania State Univ., 249 Agricultural Engineering Bldg., University Park, PA 16802 Fourier transform infrared photoacoustic spectroscopy (FTIR-PAS) can be applied for depth profiling studies in heterogeneous or layered polymer materials. It could be a tool to non-destructively analyze a heterogeneous package system. In this study, the objective is to examine a protein-starch-polyethylene composite by depth profiling and identify the heterogeneous layers using FTIR-PAS and generalized two-dimensional (G2D) correlation analysis. A protein-starch-polyethylene heterogeneous system was analyzed by FTIR-PAS and G2D correlation analysis. Well-separated peaks corresponding to starch, protein, and polyethylene were obtained from the FTIR-PA spectra. The analysis was confirmed by comparing the peaks from the composite layers with the peaks of the individual components. Overlapping peaks that correspond to protein and starch in the mid-infrared region were resolved using the generalized two-dimensional (G2D) correlation analysis for spectra enhancement. The study indicated that a starch-protein composite system wrapped in a polymer package could be non-destructively identified using FTIR-PAS with G2D analysis.
Session 73D, Food Packaging
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