Absorbance was found to have better linear relationship
with the concentration. For ATL, the r2 was found to be
0.9994, and for the ATV the r2 was 0.9991. Calibration
graphs were constructed in the concentration range of 5-30
μg/mL for ATL and 2-12 μg/mL for ATV. The correlation
coefficients, y-intercepts and slopes of the regression lines of
the two drugs were calculated and are presented in Table 1.