chamber (Camag) saturated for 15 min with the vapors of mobilephase, to a developing distance of 7.0 cm, at room temperature (≈201). After the chromatographic elution, the plates were dried at room temperature and prepared for the spots visualization procedure. Different common detection reagents includingo-phtalaldehide, fluorescamine and ninhydrin were tested according to the procedures described in the literature [35] in allcases. Implementation of the DPPHd reaction in the developed HPTLC method required optimization of severa lparameters (suchastime/temperature needed to dry the chromatographic plates and DPPHd solution concentration) in order to obtain accurate and reproducible results. Also, according to the bes tresults, the plateswere dried in the oven for 1 h at 65 1C, cooled at room temperature and sprayed with a freshly prepared 0.02 % DPPHd solution in ethanol. The investigated amines were detected in visible light as
bright-white spots against a purple background