Table 1.

FTIR vibrational frequencies representing formulated and unformulated isoniazid key functional groups.

Functional Groups and Remarks	Vibrational Frequencies (cm−1)
	Unformulated Isoniazid	Isoniazid Loaded RDS Formulation
C–C–C–C and C–N–C–C torsion	653	665
NH2 rock	677	677
C–C–C out of plane bending	746	757
C–C–H out of plane bending	850 and 1022	850 and 1023
C–N–C and C–C–C in plane bending	1063	1062
Aromatic C–N stretching	1344	1330
C–C–H in plane bending	1210	1212
O=C-N in plane bending	1330	1333
C–N–H in plane bending	1411	1408
C–C stretching	1477	1471
C=O stretching	1558	1552
NH2 scissoring	1632	1635
Aromatic C–H stretching	3052	3054
N–H stretching	3307	3308
O–H stretching	-	3676