Sample
    No.
Taken
(μg/mL)
Found*
(μg/mL)
 % Recovery
   Nifedipine  Atenolol Atenolol Nifedipine Atenolol Nifedipine
1 10 40 9.98 39.93 99.84 99.83
2 15 45 15.12 45.34 100.86 100.76
3 20 50 20.07 50.08 100.37 100.17
4 25 55 24.97 54.39 99.90 98.90
5           30 60 30.00 59.96 100.00 99.94
Mean ± SD   100.19 ± 0.380 99.92 ± 0.662
% RSD   0.379 0.660
*Average of 3 determinations.
Table 5: Accuracy expressed as % recovery of nifedipine and atenolol in their standard solutions by the proposed HPLC method.