Planta Med. 75, 12-17 (2009). HPTLC of swertiamarin and the ethyl acetate extract of Enicostemma axillare on silica gel with ethyl acetate - butanol 1:1 in a twin trough chamber. Quantitative determination by densitometric absorbance measurement at 254 nm.

J. Planar Chromatogr. 23, 315-319 (2010). HPTLC of polyphenols (extracted from Quercus robur) and quercetin, chlorogenic acid, gallic acid, and rutin as standards on silica gel with ethyl acetate - water - formic acid 87:3:10 in an unsaturated twin-trough chamber. Detection by spraying with 1 % 2-aminoethyl diphenylborinate (natural products reagent) followed by 2 % polyethylene glycol 4000 solution as well as by spraying with 2 % phosphomolybdic acid reagent followed by heating at 120 °C for 5 min. Evaluation by densitometry in absorption mode at 700 nm.

J. Planar Chromatogr. 24, 534-538 (2011). HPTLC of clarithromycin in plasma on silica gel (prewashed with methanol) with ethyl acetate - methanol - 15 % ammonium acetate (pH 10.6) 7:2:1 in a twin-trough chamber with saturation for 15 min. Detection by dipping into xanthydrol solution (10 % in methanol). Quantitative determination by densitometry in absorbance mode at 506 nm. The hRf was 62. The method was linear over the range of 0.1-3.0 µg/mL (r2 = 0.9974). The recovery (by standard addition) was over 85 %. The intra-day and inter-day precision (%RSD) of the assay was in the range of 0.8-4.6 %. The recovery was above 95 %.

J. Planar Chromatogr. 24, 503-506 (2011). HPTLC of oleanolic acid in extracts of dried roots on silica gel with toluene - ethyl acetate - glacial acetic acid 70:30:1 in a saturated twin-trough chamber. Detection by spraying with anisaldehyde-sulfuric acid reagent and heating in an oven at 110 °C for 5 min. Quantification was performed by immediate densitometric absorbance measurement at 529 nm. The average recovery was 98.9 %. LOD and LOQ were 10 and 30 ng/zone, respectively. The hRf value was 58. Linearity was between 100 and 1000 ng/zone. Precision (%RSD) was 1.4 %.

J. Liq. Chromatogr. Relat. Technol. 34, 1664-1675 (2011). HPTLC of pramipexole in pharmaceutical formulations on silica gel with ethyl acetate - toluene - methanol 16:3:1 + 1 drop ammonia. Quantitative determination by absorbance measurement at 263 nm. The hRf value of pramipexole was 32. Precision was below 2 %. Linearity was 200-2000 ng/zone. LOD and LOQ were found to be 30 and 200 ng/zone. The intermediate/inter-day/intra-day precision (n = 6) was 0.4 %. Recovery (by standard addition) was in the range of 98.5-99.1 %.

J. Planar Chromatogr. 25, 509-515 (2012). HPTLC of textile dyes Lanasyn Blue F-L 150 (1), Lanasyn Dark Brown M-GLN (2), Lanasyn Red M-GA (3), Nylosan Dark Brown S-MBL (4), and Nylosan Red N-2RBL (5) on RP-18 with n-butanol - ethyl acetate - 5 % ammonium hydroxide 4:4:1. Quantitative determination by absorbance measurement at 550 nm. Linearity was in the range of 20-60 ng/band. Limits of detection for (1) to (5) were 7, 6, 3, 5 and 1 ng/band, respectively.

J. Planar Chromatogr. 25, 394-402 (2012). 2D-HPTLC of kaempferol, quercetin, rutin, hyperoside, ferulic acid, gallic acid, caffeic acid, chlorogenic acid, chinic acid, p-coumaric acid, catechin, epicatechin, and resveratrol in the flowers of Eupatorium cannabinum on cyano phase with propan-2-ol mixed with n-heptane, and ethyl acetate mixed with n-heptane as non-aqueous mobile phases in the first direction and after turning the plate 90 ° with methanol mixed with water in the second direction of development. Detection by spraying with diphenylborinic acid 2-aminoethylester and PEG 4000 or DPPH radical reagent. Evaluation under UV 254 nm and 366 nm. The 2D-HPTLC system allowed the separation of the phenolic fractions.

J. Planar Chromatogr. 25, 388-393 (2012). HPTLC of alternariol (1), alternariol monomethyl ether (2), altenuene (3), L-tenuazonic acid (4) in Alternaria alternata strains isolated from foodstuffs on silica gel pre-coated with oxalic acid in methanol with toluene - ethyl acetate - formic acid 6:3:1. Quantitative determination by absorbance measurement at 254 nm. The hRf values of compounds (1) to (4) were 25, 36, 49 and 30, respectively. The %RSD of repeatability were 7–19. Limit of detection for compounds (1) to (3) was 0.3 mg/kg and limit of quantification for (1) to (4) was 5.0 mg/kg in rice cultures with Alternaria alternata mycelium.