J. Chromatogr. 670, 191-198 (1994). Studies of the retention behavior of 15 closely related coumarins in normal-phase OPLC with the aim of comparing the retention with those in normal-phase TLC and HPLC with the mobile phase optimized according to the PRISMA system. Examination of two and three dimensional evaluations of k' against selectivity points, the a values for TLC, OPLC and HPLC. Discussion of the retention behavior of different solvent systems in different techniques.

Phytochemistry 45, 1049-1056 (1997). TLC of various benzopyran derivatives with hexane - dichloromethane 1:1 and 4:1 and with hexane - acetone 9:1, Detection under UV and with vanillin-sulfuric acid reagent. Also prep. TLC on silica with hexane - ethyl acetate in different ratios.

Planta med. 65, 695-699 (1999). TLC of maackiain, umbelliferone, cichoric acid and echinacoside on silica gel with ethyl acetate - acetic acid - formic acid - water 100:11:11:27 and formic acid - ethyl acetate - toluene 3:10:10. Detection after spraying with 1% 2-aminoethyldiphenyl borate in methanol and 5% polyethylene glycol 4000 in methanol under UV.

Planta med. 66, 163-168 (2000). Analytical and preparative TLC of D8-lanostane-type triterpene lactones (3a-hydroxy-7-oxolanosta-8,24-dien-26,23R-olide and 3a -hydroxy-7,11-dioxolanosta-8,24-dien-26,23R-olide) on silica gel with chloroform - methanol 50:1; 19:1. Detection under UV 254 and 366 nm.

J. Planar Chromatogr. 19, 118-123 (2006). The computer-assisted simulation program DryLab has been used to simulate TLC separations. The simulations were based on data from preliminary TLC separations. For DryLab data entry of Rf values from TLC were converted to retention times, the development distance on the plate was used as column length, and the thickness of the adsorbent was used as the column diameter. To achieve reasonably accurated simulations it was found necessary to run three preliminary runs in which differences between organic modifier concentration in two adjacent runs were more than 5 %. The possibility of predicting HPLC separation conditions on the basis of TLC separations was also studied. - TLC of gallic acid, rutin, (+)-catechin, naringenin, and quercitin on RP18 with mixtures of acetonitrile and 0.1 % aqueous formic acid. Scanning at 255 nm in reflectance mode.

J. Chromatogr. A 1465, 197-204 (2016). Demonstration of a strategy for an improved quality control of propolis shown on the example of 30 French propolis samples based on evaluation of their HPTLC fingerprints in combination with selected mass signals obtained by desorption-based scanning mass spectrometry (MS). Separation of the French propolis sample extracts by HPTLC on silica gel with n-hexane – ethyl acetate - acetic acid 5:3:1 and on RP phase with n-hexane – toluene – ethyl acetate – formic acid – acetic acid 16:6:10:3:3, both in twin-trough chambers with 37 % hydrochloric acid applied on a filter paper in the second trough of the chamber. Analysis of the fingerprints, obtained by two different detection modes, i.e. after (1) derivatization with NP and PEG reagents and fluorescence detection at UV 366 nm and (2) scanning direct analysis in real time (DART)-MS, by multivariate data analysis. The best classification was obtained using both methods, RP-HPTLC-FLD and RP-HPTLC-DART-MS, in combination with pattern recognition techniques, such as principal component analysis. Observation of the characteristic patterns from the two types, in which all investigated French propolis samples were divided. Identification of phenolic compounds, such as caffeic acid, p-coumaric acid, chrysin, pinobanksin, pinobanksin-3-acetate, galangin, kaempferol, tectochrysin and pinocembrin, as characteristic marker compounds of French propolis samples. Confirmation of the presence of two botanically different types of propolis, known as the blue and orange types.

J. Agric. Food. Chem. 31, 453-454 (1983). TLC of emodin (l,3,8-trihydroxy-6-methylanthraquinone) on silica with a) hexane - chloroform - acetic acid - methanol 50:50:2:1, b) chloroform - acetone - water 88:12:1, c) chloroform - methanol - acetic acid 100:1:1. Detection by UV 254 or 366 nm and with NH 3 vapors.

(Linden blossoms. Isoquercitrin - main flavone of the medicinal drug.) Dtsch. Apoth. Ztg. 127, 509-510 (1987). (Linden blossoms. Isoquercitrin - main flavone of the medicinal drug). TLC determination and separation of hyperoside and isoquercitrin on silica with ethyl acetate - MEK - formic acid - water 50:30:10:10. Detection after drying by spraying with 1 % methanolic diphenylboryl-oxyethylamine solution and consecutively with 5 % methanolic Macrogol 400 R solution. Examination under UV 365 nm.