J. Planar Chromatogr. 4, 106-110 (1991). Presentation of 3 examples of optimization of AMD gradients: 1 + 2: Universal gradients optimized for the separation of phenolic compounds spanning a wide polarity range on diol layers, 3: Optimization for the separation of organochlorine pesticides on silica spanning a low polarity range. Preliminary isocratic developments of selected standards were performed with binary solvent mixtures in order to set up the gradients. The retention data (as plots of Rm values against solvent composition) can be used for the choice of the gradient components and gradient boundaries.

J. Chromatogr. 607, 163-167 (1992). Investigation of the influence of the concentration of the impregnant on separation, and resolution of meta and para isomers. Optimized conditions.

(German). Dtsch. Lebensm. Rdsch. 91, 14-17 (1995). TLC of phenolic components (i.a gallic acid, protocatechuic acid, catechin, chlorogenic acid, epicatechin) after separation from red wine pigments on cellulose with 20% methanol (pH 2.5); visualization after drying by dipping for 1 min into a 5% iron(III)chloride solution. Quantification by densitometry at 700 nm. - TLC of red wine pigments on silica (after extraction by column chromatography on polyamide-6 powder and a mixture of butanol - acetic acid - water 4:1:5) with butanol - butyl acetate - formic acid - water 13:5:2:3. Quantification by densitometry at 540 nm. Simple chromatographic procedure for routine analysis.

Phytochemistry 47, 269-272 (1998). Isolation of four new coniferyl alcohol derivatives and of two new sinapyl alcohol derivatives by preparative TLC on silica with benzene - acetone 5:1, benzene - ethyl acetate 3:1 and petrol ether - acetone 3:1. Detection under UV 254 nm or by heating after spraying with 5% sulfuric acid.

Chromatographia 49, 256-260 (1999). TLC on silica gel, propylamine, diol layers by stepwise multiple development with mixtures of hexane - MEK, and on RP-18 with an isocratic mobile phase. Identification of 14 out of 25 separated compounds by using a standard mixture.

J. Agric. Food Chem. 51, 3874-3879 (2003). TLC and preparative TLC of flavonoids and glycosides, e.g. 4b-di-O-acetyl-3-methoxytyrosol, 4-[O-a-apiofuranosyl-(1'-2')-b-D-glucopyranosyloxy]benzaldehyde, 3',4',7-tri-O-acetyl-flavone, 3',5,7-tri-O-acetyl-4'-O-methylluteolin, on silica gel with benzene - acetone - methanol 5:4:1. Detection by spraying with 40% formaldehyde - sulfuric acid 1:49 or anisaldehyde - sulfuric acid - ethanol 1:1:45 and heating at 120°C.

J. Liq. Chromatogr. & Relat. Technol. 29, 2997-3007 (2006). TLC of pyrocatechol on silica gel (prewashed with methanol - chloroform 1:1), with methanol - chloroform 1:9. Densitometric measurement at 200 nm. Investigation of stability on silica gel, as well as in solutions, in relation to different storage conditions.

Analytical Chemistry - An Indian Journal 8(1), 29-33 (2009). A sensitive and accurate HPTLC method has been developed for the determination of eugenol from the leaf and berry powder of Pimenta dioica (L) Merr. The leaf and berry powders were extracted with methanol. HPTLC on silica gel with ethyl acetate - methanol - water 6:2:1. Detection and quantification by densitometry at 280 nm. Linear response to eugenol was found to be in the concentration range of 200-600 ng/band. The developed method can be used for routine quantitative monitoring of eugenol from the dried leaf and berry powder of Pimenta dioica (L) Merr.