. 2014 Jul 30;4(6):655–664. doi: 10.1007/s13205-014-0239-4

Table 1.

Assignment of the FT-IR bands of functional groups in pretreated corn cob

Wavelength number (with dislocation)	Functional groups	Peak assignment	References
3,000–3,500 cm⁻¹	O–H	Stretching of alcohol and could be due to presence of adsorbed water in the sample	Owen and Thomas (1989)
2,800–3,000 cm⁻¹	C–H	Energy absorbed due to C–H bonds stretching of methyl and methylene (aliphatic and aromatic) groups	Ding et al. (2012)
2,000–2,350 cm⁻¹	C≡C	Vibrations of C≡C bonds due to the weak bands	Wilson et al. (2000)
1,635 cm⁻¹	C=O	Carbonyl stretching associated with aromatic rings	Shi and Li (2012)
1,427 cm⁻¹	–CH₂	Plane-bending vibrations	Schulz and Baranska (2007)
1,367–1,315 cm⁻¹	C–O and C–H	Attributed to weak C–O stretching and C–H symmetric and asymmetric deformations	Yu et al. (2007) Sun et al. (2005)
1,207–1,157 cm⁻¹	C–O	Due to weak C–O stretching and glycosidic linkage	Robert et al. (2005)
1,100–1,000 cm⁻¹	–C–O, C=C and C–C–O	Vibrational stretching and can also be due to non-structural CHO bending.	Schulz and Baranska (2007)
896 cm⁻¹	β-1-4	β-1-4 linkage	Robert et al. (2005)