In Situ Swelling Behavior of Chitosan-Polygalacturonic Acid/Hydroxyapatite Nanocomposites in Cell Culture Media

Table 3

Band assignment of dry and soaked Chi-PgA-HAP films for 1150–500 cm⁻¹ regions.

Band assignment	Band position as per the soaking conditions (cm^-1)
	Dry	1 day	2 days	8 days	24-day	48-day
C–O stretching in𝜈(C–O–C)	1155	1150	1154	1151	1149	1152
𝜈3 asymmetric PO stretching	1113, 1070	1107, 1061	1110, 1067	1102	1107, 1072, 1043	1110, 1077, 1049
𝜈1 symmetric PO stretching	1009, 954	996, 953	1001, 952	1021, 956	1009, 956	1010, 960
P–O(H) stretching	894	895	894	895	896	896
O–H bending in HAP structure	645	645	645	644	643	645
𝜈4 O–P–O bending	569	569	568	566	563	564