The release of
THP from matrix tablets was performed at 37 ± 0.1C
using a standard dissolution tester DT 700 (Erweka, Germany)
connected to a UV spectrophotometer (UV-300
Spectronic Unicam) using paddle method at 100 rpm and a
dissolution medium volume of 1000 ml. The pH values of
the release media were 1.5 (HCl solution) and 7.4 (phosphate buffer solution).