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. 2021 May 25;8:101396. doi: 10.1016/j.mex.2021.101396

Fig. 9.

Fig. 9

Examples of ATR-FTIR spectra in control condition (blue and purple lines) and after digestion protocol (red and orange lines) for PET from GoodFellow and Sigma manufacturers. Dotted lines in PET spectra (d) represent wavenumbers 3600, 3320 and 3100 cm−1.