J. Chromatogr. A 1571, 223-230 (2018). Evaluation of lipophilicity of 11 representative drugs, including six proton pump inhibitors (omeprazole, pantoprazole, rabeprazole, lansoprazole, ilaprazole, and tenatoprazole), an anti-vertigo drug, betahistine, nonsteroidal anti-inflammatory drug, ibuprofen, anti-malarial drug, atovaquone, an anti-HIV agent, atazanavir and a hormonal drug, calcitriol, by employing NP and RP separation modes. Investigation of the effect of different organic modifiers for the estimation of lipophilicity. Estimation of the quantitative descriptor of lipophilicity, the partition coefficient (logP) by suitably optimizing the solvent systems for normal and reversed phase TLC. The best mobile phase pairs were toluene – acetonitrile and water – methanol, respectively. Analysis of the dominant pattern in the data by using principal component analysis, hierarchical cluster analysis, as well as non-parametric methods like sum of ranking differences and generalized pair wise correlation. The results obtained from both separation modes were comparable and in good agreement with the computational data for all the drugs.

J. Ethnopharmacol. 232, 135-144 (2019). HPTLC of hesperidin in Citrus reticulatae pericarpium on silica gel with ethyl acetate – formic acid – acetic acid – water 15:1:1:2. Qualitative identification at UV 275 nm. The hRF value for hesperidin was 26.

Anal. Chim. Acta 159, 359-363 (1984). TLC of pyrene on silica with ether - 3-methylpentane 4:3. Detection by site-selection spectroscopy with excitation at 363.8 nm.

J. Chromatogr. 318, 373-377 (1985). TLC of various ecdysteroids on silica with chloroform - ethanol 4:1, on C18 -bonded silica with methanol - water 65:35 and on paraffin-coated silica plates with methanol - water 5:5. Detection by UV 254 nm. Rf values of 26 compounds are reported. Best results obtained with C18 bonded RP-HPTLC plates. (See also: I. Wilson et al., J. Chromatogr. 212, 211 (1981).)

J.A.O.A.C. 67, 566-569 (1984). TLC of N4-gluco pyranosyl sulfamethazine and its degradation products on silica with ethyl acetate - methanol - water 4:1:0.1. Detection after hydrolysis with a modified Bratton-Marshall reagent.

Pharmazeutische und lebensmittelchemische Aspekte. (Woodruff and spiced wine. Pharmaceutical and food analysis related aspects.) Dtsch. Apoth. Ztg. 125, 848-850 (1985). Identification and quantification of coumarin from 13 different samples. TLC on silica with chloroform; staining with 2.5 N NaOH, densitometry at 365 nm, detection limit 2 ng coumarin.

Budapest Chromatography Symposium June 13, 1985. TLC on starch and cellulose with four solvent systems. a) ethyl acetate - methanol - NH3 5:3:5, b) tert-butanol - MEK - water - NH3 4:3:2:1, c) butanol - acetic acid - water 50:25:25, d) ethyl acetate - acetone - methanol - NH3 2:3:3:2. Identification of aminophylline, azathiopurine, mercaptopurine, thioguanine, xantinolnicotinate and their metabolites: 1-methylxantine, 1, 3-dimethylxantine, 1-methyl uric acid, 1, 3-dimethyl uric acid, thyoxantine, methylthyoguanine.

of Medicine Industry 12, 30-31 (1983) (Chinese) (Screening of antibiotics by thin-layer chromatography and bioautography.) TLC of antibiotics on silica with chloroform - methanol - NH3 in different proportions. Detection by overlaying the plate with agarose gel containing neutral red, protein, beef extract, NaCl, glucose and test bacteria, e.g. Escherichia coli, and incubating at 37 °C for 18-24 hr: red bacteria areas and yellow inhibition zones.