Biochem. Biophys. Res. Commun. 478, 1403-1408 (2016). Centrifugal TLC of xanthorrhizol in the rhizomes of Curcuma xanthorrhizza on silica gel with hexane mixed with increasing ratios of chloroform. Concentric spherical bands of the separated compounds were monitored under UV 254 nm and 366 nm on the rotor. When a single band came to the edge of the rotor, the eluate was collected.

J. Chromatogr. Sci. 54 (1), 58-63 (2016). Description of a method for simultaneous determination of the two monoterpenes menthol and eucalyptol, contained in several analgesic pharmaceutical formulations for external use, by HPTLC on silica gel with hexane – ethyl acetate 4:1. The hRF value of menthol was 34 ± 4 and of eucalyptol 56 ± 4. Linearity was between 100–800 ng/zone (r2 = 0.9979) for menthol and 52–1107 ng/zone (r2 = 0.9937) for eucalyptol.

J. Planar Chromatogr. 30, 219-224 (2017). HPTLC of 18 derivatives obtained by substitution of chlorine atom at C7 or/and C6 in 6,7-dichloro-5,8-quinolinedione on RP-18 with a mixture of acetone and _x000D_water solution of buffer Tris (pH 7.4) in different volume compositions ranged from 30 % to 85 % in 5 % increments. The correlation between experimental and calculated values of lipophilicity was analyzed.

J. Planar Chromatogr. 30, 193-198 (2017). HPTLC of 20-hydroxyecdysone in Sesuvium portulacastrum on silica gel with chloroform – methanol – benzene 25:5:3. Quantitative determination by absorbance measurement at 254 nm. The hRF value for 20-hydroxyecdysone was 30. Linearity was between 50 and 500 ng/zone. LOD and LOQ were 4 and 14 ng/zone. The intermediate precision was below 2 % (n=6). The recovery rate ranged from 98.6 to 102.4 %.

J. Planar Chromatogr. 30, 211-215 (2017). HPTLC of benzyl isothiocyanate in the root of Salvadora persica on silica gel with n-hexane ‒ ethyl acetate 9:1. Quantitative determination by absorbance measurement at 191 nm. The hRF value for benzyl isothiocyanate was 61. Linearity was between 100 and 600 ng/zone. The intermediate precision was below 2 % (n=3). Recovery ranged from 97.6 to 99.5 %.

J. AOAC Int. 100, 414-421 (2017). HPTLC of two binary mixtures containing pyridoxine hydrochloride (1) with either cyclizine hydrochloride (2) or meclizine hydrochloride (3) on silica gel with dichloromethane – acetone – methanol 14:2:1. Quantitative determination by absorbance measurement at 220 nm. The hRF values for (1-3) were 7, 25 and 80, respectively. Linearity was in the range of 0.2-5 μg/zone for (1) and 0.2-4 μg/zone for (2) and (3). The LOD and LOQ were 60 and 190 ng/zone for (1), 50 and 170 ng/zone for (2) and 60 and 170 ng/zone for (3), respectively. The intermediate precision was <2 % (n=3). Average recovery rate was 99.9 % for (1) and (3) and 100.1 % for (2).

J. Planar Chromatogr. 30, 340-349 (2017). HPTLC of aripiprazole and its nine impurities as well as ziprasidone and its five impurities on RP-18 with methanol (1) or ethanol (2) as organic modifiers in the mobile phase. When methanol was used as organic modifier, the mobile phase with the lowest content of methanol was methanol – water – ammonia solution 25 % 13:6:1 and the mobile phase with the highest content of methanol was methanol – water – ammonia solution 25 % 17:2:1. When ethanol was used as organic modifier, the mobile phase with the lowest content of ethanol was ethanol – water – ammonia solution 25 % 12:7:1 and the mobile phase with the highest content of ethanol was ethanol – water – ammonia solution 25 % 16:3:1. Lipophilicity was estimated to develop the quantitative structure–retention relationship (QSRR) models which enabled fast and reliable prediction of the retention behavior.

J. Planar Chromatogr. 30, 363-374 (2017). HPTLC of acetylsalicylic acid (1) and its related compound salicylic acid (2) on silica gel with n-hexane – diethyl ether – 80 % acetic acid 7:2:1. Good quality densitograms with well separated and symmetric peaks of (1) and (2) were achieved. Detection with the following reagents: Janus blue, bromophenol blue, bromocresol blue, hydrogen peroxide (without heating and with heating to 90 °C during 60 min), 1 % sodium hydroxide (with heating to 45 °C and also with heating to 90 °C during 60 min), brilliant green, malachite green, and thymol blue.