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 8 Precision studies of n-acetyl l-cysteine

S. No.	Absorbance of n-acetyl l-cysteine (45 µg/mL) intraday precision	Absorbance of n-acetyl l-cysteine (45 µg/mL) inter-day precision
1	0.637	0.639
2	0.636	0.632
3	0.639	0.634
4	0.635	0.635
5	0.639	0.638
6	0.641	0.640
±SD	0.0021	0.0028
%RSD	0.3451	0.4538