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 7 Precision studies of l-glutathione

S. No.	Absorbance of l-glutathione (150 µg/mL) intraday precision	Absorbance of l-glutathione (150 µg/mL) inter-day precision
1	0.537	0.541
2	0.542	0.536
3	0.536	0.537
4	0.539	0.544
5	0.541	0.539
6	0.534	0.532
±SD	0.002	0.003
%RSD	0.518	0.706