Future Journal of Pharmaceutical Sciences

Table 12 Robustness studies (different column) for standard and test solutions of phosphoryl impurity

From: Development and validation of RP HPLC method for the estimation of Sofosbuvir and related impurity in bulk and pharmaceutical dosage form

Injection no.	Peak area (AU)		Retention time (min)
Injection no.	Standard	Test	Standard	Test
1	33533	35324	6.095	6.102
2	33964	33955	6.096	6.105
3	34743	33980	6.103	6.106
Mean	34080	34420	6.098	6.105
Std. dev	613.28	783.28	0.004	0.002
% RSD	1.800	2.276	0.069	0.032
% Assay	99.77

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