Biochemical Systematics and Ecology 20, 573-582 (1992). TLC of fatty acids on silica with two runs: hexane - ether - acetic acid 70:30:1 and hexane - ether 95:5. After spraying with 2',7'-dichlorofluorescein visualization under UV 366 nm.

J. Planar Chromatogr. 8, 63-68 (1995). Investigation of the effects of ß-cyclodextrin on the retention of isomeric phenolic and cis - trans cinnamic acids by and RP-HPLC and RP-HPTLC with mixtures of buffer solution and different organic modifiers like methanol, acetonitrile, of tetrahydrofuran.

J. Chinese Herb Med. (Zhongcaoyao) 26, 239-241 (1995). TLC of the hydrophobic organic acids on silica with chloroform - ethanol 1:1. Detection under UV 254 nm. Detection by spraying with bromocresol green reagent.

Chinese J. Pharm. (Zhongguo Yaoxue Zazhi) 32, 108-111 (1997). TLC on silica with chloroform - ether- acetic acid 2:2:1. Detection by spraying with 100 g/L phosphomolybdic acid in ethanol and heating at 105°C for 7 min. Quantification by densitometry at 700 nm. Precision 0.7% (n=5). Recovery 104.5 ± 3.0% (n=6).

J. Agric. Food Chem. 48, 648-656 (2000). TLC of e.g. sesamol, vanillic acid, syringic acid, sinapic acid, protocatechuic acid, caffeic acid, tyrosal, hydroxytyrosal and oleuropein on silica gel with toluene - ethyl acetate - formic acid 5:4:1. Detection after staining with 0.4 M DPPHH in methanol.

Planta med. 65, 455-457 (1999). Preparative TLC on silica gel plates of 2-(4-hydroxyphenyl)ethyl 1-dodecyl-octadecanoate on silica gel with hexane - ethyl acetate 7:3 and of ursolic acid with chloroform - ethyl acetate 5:2. Detection under UV 254 nm.

J. Planar Chromatogr. 15, 463-465 (2002). HPTLC and TLC of 3,5-dihydroxybenzoic, vanillic, p-coumaric, p-hydroxybenzoic, gentisic, caffeic, syringic, sinapic, ferulic, protocatechuic, and 2,4-dihydroxybenzoic acid on silica gel and RP-18. Detection under UV 254 and 366 nm and by derivatization with bis-diazotized sulfanilamide. One-dimensional HPTLC was performed on RP-18 with methanol - water 2:3 and on silica gel with toluene - dioxane - formic acid 7:2:1 and a gradient of decreasing polarity and formic acid concentration. Documentation by densitometry. 2D-TLC on silica gel with toluene - dioxane - formic acid 7:2:1 in the first direction and, after drying, with a three step gradient elution program in the second direction. TLC on RP-18 was used in the first direction with methanol - water 2:3 After the first development the phenolic acids were transferred to the second silica gel plate with 70% methanol. TLC in the perpendicular direction was then performed with a three-step gradient elution program. The combined methods resulted in separation of all compounds investigated.

CBS 86, 4-5 (2001) HPTLC of 3-methoxy-4-amino azo meta sulphonic acid (MAMASA) on silica gel with n-butanol - diethylamine - ammonia - methanol 9:5:5:2 with chamber saturation for 5 min followed by drying at 40 °C. Quantitative determination by absorbance measurement at 254 nm.