First method is HPTLC which depends on separation and quantitation of the studied drugs on
aluminum plates pre-coated with silica gel 60 F254 as a stationary phase using chloroform:methanol:ethyl
acetate:glacial acetic acid (8:0.8:0.6:0.2, v/v/v/v) as mobile phase followed by densitometric measurement
of the bands at 254 nm.