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 16 Robustness studies of l-glutathione

Wavelength (±nm)	Absorbance 1	Absorbance 2	Absorbance 3	Mean	±SD	%RSD	Mean %RSD
Effect of wavelength (± 2 nm)
l-glutathione
216	0.536	0.537	0.539	0.53	0.001	0.23	0.28
218	0.534	0.535	0.537	0.53	0.001	0.23
220	0.536	0.538	0.541	0.53	0.002	0.38