Planta med. 66, 749-751 (2000). TLC of lignans (di-O-methyltetrahydrofuroguaiacin B and (+)-veraguensin on silica gel with ether - n-hexane 7:3. Detection by spraying with a 0.1% methanolic solution of 1,1-diphenyl-2-picrylhydrazyl radical.

by thin-layer chromatography.) (Chinese). J. Chinese Trad. & Herb. Drugs (Zhongcaoyao) 33 (6), 513-515 (2002). TLC on silica gel with a solvent system composed of benzene, acetone and methanol. Optimization by systematically adjusting the proportions of the solvent components, the system benzene - acetone - methanol 9:3:2 was the best.

J. Planar Chromatogr. 15, 433-436 (2002). Improvement of separation TLC of (+)-catechin and (-)-epicatechin on cellulose with 1-butanol - water - acetic acid 4:2:1, developed in horizontal chambers (tank and sandwich configuration), with and without preconditioning. Prewashing of the plates, preconditioning, and the type of developing chamber had a large effect on the chromatographic results. Without prewashing of the TLC plate unsatisfactory or misleading results were obtained. Anisaldehyde-sulfuric acid dipping reagent proved to be more selective than vanillin - phosphoric acid as detection reagent for flavan-3-ols; the latter was, however, more sensitive.

J. Planar Chromatogr. 16, 468-469 (2003). HPTLC of plant extracts with different sulfur-containing groups (e.g. allicin and disulfides) on silica gel with toluene - ethyl acetate 10:3 for Allium extracts and toluene - ethyl acetate 7:3 for Ferule foetida extracts. Visualization by spraying with a solution of 3 g bismuth nitrate in 5 mL concentrated nitric acid and dilution to 100 mL with water. Alternatively, a solution of 3 g bismuth nitrate in 100 mL acetone can be used; in addition observation under UV 254 and 366 nm. Densitometry at 417 nm for allicin and at 392 nm for disulfides.

Planta med. 68, 88-91 (2002). TLC of neochlorogenic acid, protocatechuic acid, 3-O-[Z]-p-coumaroylquinic acid, 3-O-[E]-p-coumaroylquinic acid, cryptochlorogenic acid, mangiferin, isoorientin, cyanidin-3-O-a-L-rhamnoside, rutin, hyperoside, isoquercitrin, miquelianin, astilbin, guaijaverin, quercitrin, quercetin, biapigenin, amentoflavone, pinocembrin-7-methyl ether, pseudohypericin, hyperforin, hypericin on silica gel with ethyl acetate - formic acid - water 30:2:3. Detection by derivatization with Naturstoff reagent.

Planta med. 70, 138-142 (2004). Analytical and preparative TLC of lithospermate B salt mixture on silica gel with chloroform - ethyl acetate - benzene - formic acid - methanol 15:20:10:10:1.

J. Planar Chromatogr. 18, 377-379 (2005). HPTLC of 2-azaanthraquinone from plant extracts on silica gel with toluene - ethyl acetate - methanol 40:9:1. Quantitative determination by absorbance measurement at 310 nm. Calibration was linear in the range of 10-100 µg/mL. The method was repeatable and precise with RSD between 0.98 and 1.59 % intra-day and between 3.41 and 5.56 % inter-day. Limits of detection and quantification were 3 and 6 µg/mL.

Planta Med. 70, 1189-1194 (2004). Preparative TLC of the new glycosides symploside and symploveroside on silica gel with methanol - acetone - chloroform 1:50:149 and 1:68:131. Detection under UV light at 254 nm.