Chromatographic conditions
The HPTLC system was composed of a CAMAG (Muttenz, Switzerland) Linomat-5 automatic sample applicator and CAMAG TLC scanner-3 provided with CATS software (version: 1.4.4.6337). The stationary phase was composed of pre-coated silica gel 60 F254 HPTLC plates (20 cm x 10 cm; with 0.25 mm thickness).