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 10 Recovery studies of l-glutathione

Level (%)	Conc. (µg/mL)	Conc. before spiking (µg/mL)	Conc. of std added (µg/mL)	Conc. after spiking (µg/mL)	% Recovery	Mean	±SD	%RSD
80	100	100.61	80	179.98	99.21	99.94	0.61	0.61
	100	100.63	80	181.21	100.72
	100	100.72	80	180.64	99.90
100	100	100.41	100	202.09	101.68	100.90	0.96	0.96
	100	100.58	100	200.12	99.54
	100	100.46	100	201.94	101.48
120	100	100.82	120	219.64	99.01	99.81	0.58	0.58
	100	100.37	120	220.42	100.04
	100	100.72	120	221.20	100.40