Planta Med. 70, 993-1000 (2004). Preparative TLC of catuabine and its hydroxymethyl derivative 7-exo-hydroxy-N-methyl-catuabine on silica gel with dichloromethane - acetone 97:3 and toluene - acetone - methanol - ammonia 45:45:7:3. Detection under UV light at 254 and 366 nm and by spraying with potassium iodoplatinate reagent (0.25 mL of 5 % hexachloroplatinic acid solution mixed with 2.25 mL of 10 % potassium iodide solution and dissolved with 5 mL water).

Planta Med. 72, 46-51 (2006). Preparative TLC of acacetin, jaceidin, tricetin 3’,4’,5’-trimethylester, diosmetin, apigenin, eupafolin, chrysoeriol, (+-)eriodictyol, 3,4-dihydroxybenzaldehyde, p-coumaric acid, 5-O-caffeoylquinic acid methyl ester, 4,5-O-dicaffeoylquinic acid on RP18 with acetonitrile - methanol - water 1:1:3. Detection under UV at 254 nm.

using high-performance thin-layer chromatography. J. AOAC Int. 89, 1467-1474 (2006). HPTLC of eugenol, luteolin, ursolic acid, and oleanolic acid on silica gel in a twin trough chamber with toluene - ethyl acetate - formic acid 35:15:1 at 25 °C and 40 % relative humidity. Quantitation in absorbance mode at 280 nm for eugenol, at 350 nm for luteolin, and at 530 nm for ursolic acid and oleanolic acid after derivatization with anisaldehyde-sulfuric acid reagent and heating at 105°C. The methods were validated for precision, repeatability, and accuracy.

by high speed countercurrent chromatography. J. Liq. Chromatogr. & Relat. Technol. 30, 135-145 (2007). TLC of pinoresinol diglucoside and liriodendrin on silica gel (impregnated with 1 % carboxymethyl cellulose sodium) with the lower phase of chloroform - methanol - water 65:35:16. Detection by spraying with 10 % ethanolic sulfuric acid.

J. Liq. Chromatogr. & Relat. Technol. 30, 1105-1114 (2007). TLC of salvinorin A, a potent naturally occuring kappa-opioid selective agonist, on silica gel and on RP-18 with n-hexane - ethyl acetate 1:1. Detection by spraying with vanillin - phosphoric acid reagent followed by heating.

J. Planar Chromatogr. 20, 189-196 (2007). TLC of sabinene, limonene, linalool, and beta-caryophyllene on silica gel with benzene - ethyl acetate 9:1. Detection by spraying with a solution of vanillin in concentrated sulfuric acid, followed by heating at 105 °C for 2 min.

Chromatographia 66 (9-10), 801-804 (2007). HPTLC of withaferin A and withanolide A in Withania somnifera methanolic extract from different plant parts (leaf, root, stem and fruit) and of two morphotypes, on silica gel with toluene - ethyl acetate - formic acid 5:5:1. Quantification by densitometry in absorption mode at 530 nm. Linearity was between 200 and 3200 ng for both withaferin A and withanolide A. The average recovery of withaferin A and withanolide A was 96.0 and 96.7 %.

Chromatographi 68 (1-2), 129-133 (2008). Description of a simple, rapid, specific and sensitive method for the quantitative estimation of mevalonic acid in leaves of Artemisia annua, Psorelia corylifolia, Vinca rosea, Withania somnifera and Barleria proinites. TLC of leaf extracts on silica gel with benzene - acetone 3:2 which involved conversion of mevalonic acid to its lactone, mevalonolactone. Detection by treatment with anisaldeyde reagent. Quantitative determination of mevalonolactone by absorbance measurement at 600 nm. Linearity was between 100 and 500 ng per spot. Recovery (by standard addition) was higher than 98 % for mevalonolactone. The limit of detection was 50 ng per spot.