Development and Validation of Stability Indicating HPTLC and HPLC Methods for Simultaneous Determination of Telmisartan and Atorvastatin in Their Formulations

Table 3

Results of robustness study by HPLC.

Parameter	% RSD
	TLM	ATV
Change in pH of mobile phase
pH 4.0	0.412	0.845
pH 3.8	0.850	0.567
pH 4.2	0.643	0.730
Change in temperature
20°C	0.802	0.335
25°C	0.560	0.950
30°C	0.358	0.741
Change in flow rate
0.8 mL/min	0.841	0.863
1.0 mL/min	0.924	0.857
1.2 mL/min	1.984	1.732
Change in wavelength
280	0.537	0.870
282	0.960	1.005

TLM: Telmisartan; ATV: Atorvastatin.