Sugarcane Bagasse as the Source of Nanocrystalline Cellulose for Gelatin-Free Capsule Shell

Table 2

Functional group analysis of the CE and NCC.

Wavenumber (cm^−1)
CE	NCC	Range (cm^−1)	Functional group interpretation
3,443.05	3,433.41	34,00–3,200	O-H stretching vibration
2,920.32	2,860.53	3,000–2,850	Sp3 C-H stretching
—	—	1,750–1,735	C=O stretching
1,643.41	1,635.69	1,650–1,630	OH (air)
—	—	Around 1,600 and 1,475	C=C aromatic ring
—	—	1,600–1,500	C=C aromatic ring
1,371.43	1,402.3	1,440–1,000	C-O-H bending
1,157.33	—	1,300–1,000	C-O stretching vibration
1,066.67	1,035.81	1,300–1,000	C-O stretching vibration
896.93	—	Around 850	Asymmetric C-O-C stretching vibration
—	—	900–690	=C-H stretching aromatic ring