Development and validation of an eco-friendly HPLC–UV method for determination of atorvastatin and vitamin D3 in pure form and pharmaceutical formulation

Table 5 Precision results of the proposed HPLC–UV method

Drug	Added concentration (µg/ml)	Intra-day precision		Inter-day precision
Drug	Added concentration (µg/ml)	Mean*% ± SD	RSD%	Mean*% ± SD	RSD%
Atorvastatin calcium	10	98.44 ± 0.27	0.28	98.79 ± 0.47	0.48
	20	101.26 ± 0.89	0.88	102.06 ± 1.04	1.02
	40	99.49 ± 0.31	0.32	100.14 ± 0.74	0.74
Vitamin D₃	2	98.41 ± 0.49	0.50	98.77 ± 0.59	0.60
	4	101.43 ± 0.45	0.44	101.91 ± 0.62	0.60
	8	100.21 ± 0.32	0.32	100.51 ± 0.39	0.39

ISSN: 2661-801X