J. Planar Chromatogr. 28, 61-66 (2015). HPTLC of swertiamarin in extracts of Enicostemma littorale and Swertia chirata on silica gel with ethyl acetate – methanol – water 16:3:1. Quantitative determination by absorbance measurement at 246 nm. The hRF value of swertiamarin was 58. Linearity was between 200 and 1200 ng/zone. The intermediate intra-day and inter-day precisions were below 2 % (n=6). The LOD and LOQ were 38 and 115 ng/zone, respectively. Recoveries were in the range of 98-100 %.

J. Planar Chromatogr. 29, 330-335 (2016). HPTLC of wedelactone in Eclipta alba, Wedelia calendulacea and Wedelia trilobata on silica gel with toluene – chloroform – ethanol – formic acid 10:8:2:1. Quantitative determination by absorbance measurement at 351 nm. The hRF value for wedelactone was 29. Linearity was between 80 and 280 ng/zone. The intermediate precision was below 2.5 % (n=3). The LOD and LOQ was 0.36 and 1.09 ng/zone, respectively. Recoveries were between 99.4 and 100.3 %.

Planta Med. 83(09), 812-818 (2017). Some of the column subfractions obtained (with different mixtures of hexane – acetone – isopropanol) from an ethyl acetate extract of Cratoxylum cochinchinense twigs and boughs were submitted to a preparative TLC on silica gel for the isolation of the following xanthones and anthracenones: (1) β-mangostin, cochinchinone and cratoxanthone D with chloroform – acetone 10:1, (2) allanxanthone by three-stage elution with benzene – acetone 10:1, n-hexane – ethyl acetate 3:1, and n-hexane – acetone 3:1, (3) cratoxanthone A by similar three-stage elution (third step: chloroform – acetone 10:1), (4) visminone F by two-step elution with benzene – acetone 10:1, and isopropanol – acetone 5:1, (5) cratoxanthone B and garcinone E by a two-step elution with isopropanol – acetone 4:1, and n-hexane – acetone 3:1, (6) α-mangostin and mangostenol by a two-step elution with chloroform – acetone 20:1, and n-hexane – isopropanol – acetone 5:5:1, (7) cratoxanthone C by a two-step elution with benzene – ethyl acetate 5:1, and chloroform – acetone 20:1.

Then chromatography in second direction with chloroform - acetone 8:2. Detection by UV and iodine vapor.

Planta Med. 1988, 219-221. TLC of flavonoids and xanthones on silica with chloroform - methanol - water 70:30:3, cyclohexane - ethyl acetate 1:2 and on polyamide with methanol - acetic acid 50% 9:1. Preparative separation by centrifugal TLC (2 mm silica plates) with toluene - ethyl acetate mixtures.

Helv. Chim. Acta 74, 791-799 (1991). TLC of phenolic tetracyclic compounds on silica with chloroform - methanol 95:5 and HPTLC on RP-18 with methanol - water 8:2 or on diol with ethyl acetate - petrol ether 1:1. Detection by UV 254/366 nm or with Godin reagent. Also bioautography with spores of the plant pathogenic fungus cladosporium cucumerinum. HPTLC on RP-8 and on diol allowed the separation of closely related compounds and transposition to prep. HPLC.

J. Planar Chromatogr. 6, 81-83 (1993). TLC of santalin A and B in neutral, acidic, and basic methanol on amino-modified silica with butanol - formic acid - water 19:2:5. Detection under UV 254 and 365 nm. Photodocumentation under UV 254, 366 and daylight illumination.

Phytochemistry 40, 1447-1452 (1995). TLC of various polyphenols on silica with chloroform and chloroform - methanol 7:3. HPTLC on RP-18 with acetonitrile. Most phloroglucinols gave red spots after spraying with Godin’s reagent. determination of the antibacterial activity against Bacillus subtilis by TLC bioautography on silica.