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 18 Robustness studies of Vitamin C

Wavelength (±nm)	Absorbance 1	Absorbance 2	Absorbance 3	Mean	±SD	%RSD	Mean %RSD
Effect of wavelength (± 2 nm)
Vitamin C
262.5	0.319	0.321	0.315	0.318	0.002	0.783	0.566
264.5	0.322	0.320	0.323	0.321	0.001	0.387
266.5	0.324	0.325	0.321	0.321	0.001	0.529