Planta med. 65, 279-281 (1999). TLC of lignans (podophyllotoxin, picropodophyllin, deoxypodophyllotoxin, hernandin, podophyllotoxin acetate and 5-methoxypodophyllotoxin, 5-methoxypodophyllotoxin acetate) on silica gel with petroleum ether - ethyl acetate 1:1. Visualization under UV 254 nm.

Planta med. 70, 8-11 (2004). Preparative TLC of 6aa,12aa-12a-hydroxyelliptone, deguelin, a-toxicarol, rotenone, elliptone on silica gel using dichloromethane, benzene - methanol 47:3, n-hexane - ethyl acetate 4:1, and benzene - acetone 47:3. Detection under UV light at 254 nm.

Int. J. Chem Sci 7(2), 986-992 (2009). A validated HPTLC method is reported for estimation of rofecoxib and tizanidine hydrochloride in combined dosage form. HPTLC on silica gel with methanol - ethyl acetate 1:1. The hRf value of tizanidine was 45 and of rofecoxib 67. Densitometric evaluation at 254 nm. The method was linear in the range of 180-260 ng/band for tizanidine and 2000-3000 ng/band for rofecoxib. Recovery was in the range of 99.5 - 102.5 % for both compounds. The method was suitable for routine quality control of combine dosage form.

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.