The absorbance and first-, second- and third-order derivative UV spectroscopic methods were applied for the determination of benazepril hydrochloride (BEN) in model solutions and tablets, as well as the estimation of its stability in solid phase. Derivative UV spectroscopy and HPLC methods were tested for: precision, linearity, accuracy and repeatability. HPLC was used as a reference method. Th...

In this work we consider explicit Two-derivative Runge-Kutta methods of a specific type where the function f is evaluated only once at each step. New 7th order are presented with minimized dispersion and dissipation error. These two constant coefficients 5 6 stages. Also, modified phase-fitted, amplification-fitted method frequency dependent stages constructed based on Chan Tsai. The new applie...