Table 3. Characteristic bands of FT-IR transmittance of Larix and Quercus

Wavenumber (cm–1) Functionality
L. kaempferi Q. mongolica
1,720 1,725 Unconjugated C = O in hemicellulose
1,635 1,637 Conjugated C = O in lignin
1,591 1,591 C = O stretching vibration in syringyl lingin
1,508 1,508 C = O stretching vibration in guaiacyl lingin
1,452 1,450 C-H bending vibration in lignin and aromatic carbon skeleton
1,422 1,422 C-H deformation and aromatic ring skeletal vibrations in lignin and carbohydrates
1,365 1,370 C-H deformation in cellulose and hemicellulose
1,314 1,313 C-H vibration in celluloseC-O vibration in syringyl lignin
1,260 1,260 C = O stretching vibration in guaiacyl lingin
1,240 1,241 C-O stretching in hemicellulose and syringyl lignin
1,176 1,180 C-O-C asymmetric bridge stretching in cellulose and hemicellulose
1,104 1,104 C-O-C asymmetric bridge stretching in cellulose and hemicellulose
Reference: Schwanninger et al. (2004), Kwon et al. (2013), Miranda et al. (2012), Zhao et al. (2013), Xing and Li (2014), Timar et al. (2016), Abdullah et al. (2017), Oberhofnerová et al. (2017), Vaughn et al. (2017), Gonultas and Candan (2018), Yin et al. (2018), Zhang et al. (2018), Liu et al. (2016, 2019), Kubovský et al. (2020), Xing et al. (2020).
FT-IR: Fourier transform infrared spectroscopy.