Validated HPTLC Method for Simultaneous Estimation of Atenolol and Aspirin in Bulk Drug and Formulation

Table 2

Robustness testing.

Parameter	SD of Peak Area for Atenolol	% RSD	SD of Peak Area for Aspirin	% RSD
Mobile phase composition (±0.1 mL)	6.72	1.04	12.38	1.21
Amount of mobile phase (±5%)	8.94	0.97	7.82	0.78
Time from spotting to chromatography (10 min)	9.68	0.88	10.97	0.41
Time from chromatography to scanning (10 min)	10.52	1.15	9.83	1.28