From: Development and validation of a stability indicating green analytical method for the simultaneous estimation of l-glutathione, n-acetyl l-cysteine and Vitamin C in marketed formulation using UV–visible spectroscopy
IR range (cm−1)
Functional groups
Observed values (cm−1)
3200–3140
N–H
3217.01
3800–3400
O–H
3407.2
1800–1600
CONH2
1634.4
1350–1310
C–N
1333.6
3000–2850
C–H
2955.8