Food Res. Int. 111, 361-370 (2018). HPTLC of triacylglycerols in unfermented and fermented cocoa beans on silica gel with hexane – diethyl ether – glacial acetic acid 80:20:1 and then with chloroform – methanol – glacial acetic acid 97:3:1. Detection by spraying with cerium molybdate reagent. Direct comparison of fermented and unfermented beans revealed the absence of cacaoic acid at hRf 55._x000D_

Phytochemistry. 155, 1-11 (2018). Review of recent developments in plant sources of propolis and innovative phytochemical approaches to propolis analysis, including TLC application for the assessment of its authenticity and HPTLC fingerprinting and HPTLC-DART-MS for metabolomic approaches in determining geographical origin.

J. Ethnopharmacol. 231, 494-502 (2019). HPTLC fingerprint of Albizia lebbeck on silica gel with toluene – ethyl acetate – formic acid 5:5:1. Qualitative identification under UV light at 276 nm. The hRF value for standard catechin was 48. Saponin rich fraction was also analyzed by HPTLC on silica gel with petroleum ether – ethyl acetate 1:1. Detection by spraying with anisaldehyde – sulfuric acid reagent, followed by heating at 110–120 °C for 10–12 min.

J. Chromatogr. Sci., 56 (9), 846–852 (2018). Simultaneous determination of theophylline (THP), guaifenesin (GUI) and guaiacol (GUA, a guaifenesin impurity) by HPTLC on silica gel with ethyl acetate – hexane – methanol - ammonia 65:35:10:2. Detection and quantification by densitometry at 275 nm. The hRf values were 13, 35 and 80 for THP, GUI and GUA, respectively. The linearity range was 0.4–2 μg/band for both THP and GUI, and 0.4–1.2 μg/band for GUA. Validation of the proposed method according to ICH guidelines. Statistical comparison of the results with RP-HPLC showed no difference regarding accuracy and precision.

Lipids 17, 469-475 (1982). The total methyl esters of the fatty acids of tissue glycerides were converted into methoxy-acetoxy-mercury adducts. The adducts were fractionated into groups of equal numbers of ethylenic bands on silica with hexane - dioxane 6:4. Separation of the monoethylenic acids of equal chain length into the respective cis-and trans isomers by TLC on AgNO3-silica, acc. to known procedure.

Identifizierung mittels Dünnnschicht-Chromatography. (Analysis of microbiocidal isothiazolones. II. Identification by thin-layer chromatography.) Fresenius Z. Anal. Chem. 319, 520-523 (1984). TLC of isothiazolone formulations, used for preservation of cosmetics and technical products, on silica with 6 different solvent systems. Detection with 10 spray or detection methods (e.g. Dragendorff reagent, iodine vapours, UV 254 nm).

Budapest Chromatography Symposium, June 13 (1985). TLC study of the hydrophobic properties of isomeric naphthols: alpha-naphthol, beta-naphthol, 1,5-dihydroxynaphthalene and 2,7-dihydroxynaphthalene. Results show that naphthols with the OH-group in positions 2- and 2,7- exhibit lower hydrophobic properties than those with OH in positions 1- and 1,5-. TLC on silica with benzene - acetone 7:3. Detection with 0.005 % aq. new fuchsine solution.

Phytochemistry 24, 1587-1591 (1985). TLC of cucurbitacins on silica with chloroform - methanol 9:1. Detection with vanillin - phosphoric acid reagent. For the detection of alpha-ketolcucurbitacins, the plates were sprayed with a 1:1 mixture of triphenyltetrazolium chloride (4 % in ethanol) and NaOH 1 N. Flavonoid glycosides were separated on silica with ethyl acetate - formic acid - acetic acid - water 100:11:11:27. Detection with diphenylboryloxyethylamine reagent, followed by PEG 4000 (5 % in ethanol, UV 365 nm.