Research Article
Estimation of Tadalafil Using Derivative Spectrophotometry in Bulk Material and in Pharmaceutical Formulation
Table 1
Optical characteristics of tadalafil.
| Parameters | Method A | Method B | Method C | Method D |
| Beer-Lambert’s range (g/mL) | 05–50 | 05–50 | 20–70 | 20–70 | max (nm)/wavelength range (nm) | 297 | 290.60–304.40 | 284 | 280.80–286.20 | Slope | 0.0064 | 0.0380 | 0.0013 | 0.0015 | Intercept | −0.0123 | −0.0269 | −0.0178 | 0.0151 | Correlation coefficient | 0.9993 | 0.9993 | 0.9990 | 0.9991 |
|
|