Design and Characterization of Double Layered Mucoadhesive System Containing Bisphosphonate Derivative

Table 5

IR spectral studies.

Sample	Wave number (cm^−1)	Observation
Chitosan	2840–3000	C–H stretch
	1830–1870	C=O
	3350–3310	N–H stretch
	3420–3590	O–H stretch
	1020–1275	C–O–C
HPMC-4 KM	3570–3200	O–H stretching
	2980–2950	Aliphatic C–H stretching
Risedronate sodium	3080–3010	Aromatic C-H stretch
	1600–1430	C=C and C=N stretch
	3610–3330	O-H stretch
	∼1150	Aliphatic P=O Stretch
	∼1190	Aromatic P=O stretch