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

Future Journal of Pharmaceutical Sciences

Table 17 Robustness studies of n-acetyl l-cysteine

Wavelength (±nm)	Absorbance 1	Absorbance 2	Absorbance 3	Mean	±SD	%RSD	Mean %RSD
Effect of wavelength (± 2 nm)
n-acetyl l-cysteine
231	0.636	0.638	0.635	0.636	0.001	0.196	0.261
233	0.634	0.637	0.638	0.636	0.001	0.267
235	0.642	0.639	0.637	0.637	0.002	0.322