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Experimental (in powder) and theoretical (in gas phase) IR spectra of OFI and AV mucilages: (a) FTIR spectrum of OFI mucilage versus the respective theoretical (unscaled) IR spectrum calculated at the HF/6-31(d)//PM6 level of approximation; (b) FTIR spectrum of AV mucilage versus the theoretical IR spectrum (scaled at factor 0.8953 [51]) of acemannan calculated at the HF/6-31-G(d) level of approximation. Theoretical vibrational shifting (∆υ in cm–1) are presented in parenthesis.
