Characteristic wavenumbers of the CS and CS/HAp scaffolds.

Vibration position, cm−1		Assignments
CS	CS/HAp
3360 cm−1 and 3289 cm−1	3361 cm−1 and 3290 cm−1	N–H stretching vibration of –NH2
1644 cm−1	1645 cm−1	C O stretching vibration of amide I
1560 cm−1	1562 cm−1	N–H bending vibration of –NH2 (amide II)
2879 cm−1	2881 cm−1	C–H stretching vibration of –CH2, –CH3
1416 cm−1, 1373 cm−1, and 1317 cm−1	1417 cm−1, 1375 cm−1, and 1320 cm−1	C–H bending vibration of –CH2, –CH3, and pyranose
1148 cm−1, 1059 cm−1, 1026 cm−1	1149 cm−1, 1024 cm−1	Asym. and sym. C–O stretching vibration of C–O–C linkage
	945 cm−1	Sym. P–O stretching vibration of PO43− in HAp
893 cm−1	894 cm−1	Saccharide vibration
	602 cm−1, 560 cm−1	P–O bending vibration of PO43-
	633 cm−1	O–H liberational vibration in HAp