Development and validation of derivative UV spectroscopic methods for simultaneous estimation of duloxetine and tadalafil in their binary mixtures: greenness-blueness evaluation

Table 3 Evaluation of intra-day and inter-day precisions for the determination of the investigated drugs with the proposed methods

Method	Drug	Conc. (μg mL⁻¹)	Intra-day precision		Inter-day precision
Method	Drug	Conc. (μg mL⁻¹)	% Recovery ± SD^a	%RSD	% Recovery ± SD^a	%RSD
Method I	DLX	1	99.42 ± 1.40	1.41	99.64 ± 1.36	1.37
		5	98.56 ± 1.69	1.71	99.86 ± 1.69	1.69
		9	101.62 ± 1.36	1.34	100.47 ± 1.86	1.85
	TDL	2	101.60 ± 1.91	1.88	100.71 ± 1.93	1.92
		6	100.70 ± 1.47	1.46	99.53 ± 1.22	1.23
		12	100.91 ± 0.93	0.92	100.32 ± 1.34	1.34
Method II	DLX	1	99.78 ± 1.75	1.75	100.20 ± 1.44	1.44
		5	100.97 ± 0.84	0.83	100.52 ± 1.65	1.64
		9	99.20 ± 1.49	1.50	99.73 ± 1.19	1.19
	TDL	2	99.48 ± 0.95	0.95	100.11 ± 1.75	1.75
		6	99.84 ± 1.10	1.10	100.68 ± 1.41	1.40
		12	101.08 ± 1.36	1.34	100.82 ± 0.97	0.96

ISSN: 2661-801X