FTIR analysis of coconut materials. Copyright, Elsevier 2010. Adapted with permission from Elsevier, 2010.⁷⁹.

Location of peaks (cm−1)	Assignment	Coconut materials
3460–3400	Stretching of O–H	3401
3000–2850	C–H symmetric and asymmetric stretching related to methylene and methyl groups	2911
2400–2300	Stretching vibrations of P–H and P–O–H	2326
2200–2100	Stretching of Si–H	2101
1738–1700	Stretching of C O in uronic ester and acetyl group or carboxylic group of coumaric and ferulic acids	1721
1650–1580	Bending of N–H in primary amines	1621
1375–1350	Stretching of C–H in phenolic and methyl alcohol or rocking of C–H in alkanes	1371
1250–1200	Stretching of Si–CH2 in alkanes or C–O plus C–C plus C O	1249
1086–1030	Deformation of C–O in secondary alcohol and aromatic or aliphatic C–H in plan deformation plus deformations of C–O in primary alcohol	1032
900–875	Frequency of C-1 group/ring	893