Table 2.

Validation parameters for Atorvastatin Calcium and Metoprolol Tartarate

Parameters	Atorvastatin calcium	Metoprolol tartarate
Range	500-2500 ng/spot	500-2500 ng/spot
% RSD (n=3)
Intra-day precision	0.86	0.72
Inter-day precision	0.84	0.40
Accuracy (recovery)	Within 98-102%	Within 98-102%
Robustness	Robust	Robust
LOD (ng/spot)	46.46	23.52
LOQ (ng/spot)	151.30	71.28
Specificity	Peak purity > 0.9950	Peak purity > 0.9950

LOQ^a: Limit of detection, LOD^b: Limit of quantification