By appropriate dilution of two standard drug solution
with 50% v/v aqueous methanol, solution containing 10
μg/mL of ATV and 10 μg/mL of ATL were scanned
separately in the range of 200-350 nm to determine the
wavelength of maximum absorption for the drug. The
absorbance maximum of ATV and ATL was found to be 241
nm and 225 nm, respectively.