Parameters Nifedipine Atenolol
Linearity (Range) (μg/mL) 5-35 35-65
Intercept coefficient 24.05 -31
Slope coefficient 62.834 35.21
Correlation coefficient (r) 0.9999 0.9998
LOD (μg/mL) 1.08   2.18
LOQ (μg/mL) 3.29 6.62
Precision Repeatability 1.582 1.324
Intermediate 0.549 0.706
Table 6: Assay parameters and method validation for the determination of nifedipine and atenolol by the proposed HPLC method.