J. Planar Chromatogr. 28, 229-233 (2015). HPTLC of paroxetine in human serum on silica gel with toluene - acetone - ethanol - ammonia 25 % in water 9:5:2:1. Quantitative determination by absorbance measurement at 294 nm. Linearity was between 0.01 and 0.14 ng/µL. The intra-day precisions were between 0.9 % and 2.2 % (n=5) and the inter-day precisions were between 1.0 % and 3.9 % (n=9). The LOD and LOQ was 0.3 and 0.6 ng/zone, respectively. Recoveries were between 91.5 % and 96.5 %.

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.

CBS 118, 1-4 (2017). Screening of steroids and selective androgen receptor modulators (SARMs) in bodybuilding supplements by HPTLC of methanedienone, ibutamoren, and ostarine on silica gel with n-heptane – ethyl acetate 1:1 (steroids) and dichloromethane – methanol 9:1 (SARMs) to the migration distance of 70 mm. Detection by immersion into (1) toluene sulfonic acid reagent (10 % in ethanol) followed by heating at 150 °C for 3 min, or (2) Seebach reagent (5 g phosphomolybdic acid, 2 g cerium sulfate and 12 mL sulfuric acid made up to a volume of 200 mL with water) followed by heating at 110 °C for 5 min. Detection under UV 254 nm, 366 nm and under white light. Densitometric evaluation by multi-wavelength scan at the respective absorption maxima. For example for the steroid testosterone the LOD was 8 ng/zone (absorbance measurement at 250 nm). Direct elution of target zones into the MS and analysis in positive ionization mode.

J. Planar Chromatogr. 31, 122-128 (2018). HPTLC of ondansetron with chloroform ‒ methanol ‒ ethyl acetate 7:2:1. Quantitative determination by absorbance measurement at 302 nm. The hRf value for ondansetron was 67. Linearity was in the range of 25-500 ng/zone. The intermediate precision was below 1 % (n=3). The LOD and LOQ were 5 and 15 ng/zone, respectively. Average recovery was 100.3 %. The method allowed the separation of the drug from its different degradation products.

J. High Resol. Chromatogr. 7, 593-595 (1984). HPTLC of the title compounds on silica with ethanol - ether - ethyl acetate - chloroform 12:33:22:33. Detection by spraying with 5 % cupric acetate in 15 % aqueous phosphoric acid and heating at 110 °C for 10 minutes. Fluorometry at 366 nm. Sensitivity 1-10 ng.

J. Chromatogr. 291, 377-383 (1984). TLC of tocopherols on silica with hexane - isopropylether 85:15 or acetone - benzene - water 91:30:8. Detection with 10 % copper(II)sulfate-phosphoric acid followed by charring at 190" for 10 minutes. Quantitative scanning by absorbance at 350 nm. TLC was found advantageous over HPLC when analyzing a large number of samples.

Anal. Chem. 56, 19-21 (1984) Description of TLC densitometer based on photothermal deflection of an argon ion laser of 20 mW at 488 nm as the source and a 2-MW He-Ne laser as the probe. System demonstrated with a chronatogram of 1,2-naphthoquinone, phenonthrenequinone and -ionone. Detection limit 30 ng -7.5 pg.

J.A.O.A.C. 68, 453-456 (1985). Quantitative determination of aflatoxins B1, B2, G1, G2 on silica with anhydrous ether, then after drying with chloroform - acetone 9:1. Detection by UV. In situ densitometry.