Depth profiling of a heterogeneous food-packaging model using step-scan Fourier transform infrared photoacoustic spectroscopy

Research output: Contribution to journalArticlepeer-review

Abstract

Fourier transform infrared (FTIR) spectroscopy with a photoacoustic (PA) detector was used to study a multi-layer starch-protein-polyethylene composite system. Non-destructive depth profiling was performed to identify the spectral peaks corresponding to the absorbing chemical groups of the individual components that reside in the respective layers. 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-PA spectroscopy with G2D analysis.

Original languageEnglish (US)
Pages (from-to)25-33
Number of pages9
JournalJournal of Food Engineering
Volume55
Issue number1
DOIs
StatePublished - Nov 2002
Externally publishedYes

Keywords

  • Composite materials
  • Depth profiling
  • Fourier transform infrared spectroscopy
  • Photoacoustic
  • Starch-protein-polyethylene

ASJC Scopus subject areas

  • Food Science

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