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 9 Precision studies of Vitamin C

S. No.	Absorbance of Vitamin C (6 µg/mL) intraday precision	Absorbance of Vitamin C (6 µg/mL) inter-day precision
1	0.322	0.321
2	0.319	0.326
3	0.318	0.322
4	0.322	0.325
5	0.320	0.319
6	0.321	0.321
±SD	0.0015	0.0024
%RSD	0.477	0.760