J. Planar Chromatogr. 6, 472-475 (1993). Adsorption chromatography of color pigments of paprika on aluminium oxide with hexane - chloroform mixtures and RP chromatography on impregnated Kieselguhr (overnight predevelopment in hexane - paraffin oil 95:5) with eluents comprising mixtures of tetrahydrofuran, acetone, and water or acetone and water. Quantification by densitometry at 440 nm.

J. Chromatogr. 624, 353-367 (1992). Review with 62 references on some of the most important procedures for pesticide residue analysis, involving TLC as well as GC, HPLC, SFC and their coupling with sensitive and selective detection methods.

J. Planar Chromatogr. 7, 382-385 (1994). TLC of two groups of positional isomers of monoenoic fatty acids 6-18:1, 9-18:1, 11-18:1, 5-20:1, 8-20:1, 11-20:1, and 13-20:1, as their phenacyl esters on silica impregnated by immersion for ca. 20 s in either 0.5% or 1.0 % methanolic silver nitrate, with petrol ether - acetone 40:3. Quantification after treatment with sulfuryl chloride vapors for 30 min and, finally, heating at 180-200 °C for 30 min by densitometry at 450 nm.

J. Planar Chromatogr. 8, 475-479 (1995). HPTLC of phospholipid hydroperoxides and their parent phospholipids (e. g. sphingomyelin, phosphatidylcholine, phosphatidylethanolamine) on silica with hexane - ether 3:2 for the removal of all neutral lipids; HPTLC of phospholipids and PLHP with chloroform - ethanol - methanol - triethylamine - water 30:25:10:35:8. Detection by dipping in a freshly prepared solution of 1.00 g N,N-dimethyl-p-phenylenediamine and 1 mL of acetic acid in 50% aqueous methanol. After immersion for 60 s and drying for 60 min at 30 °C quantification by densitometry at 654 resp. 547 nm. Simple quantitative HPTLC method.

(HPTLC separation of low-molecular carbohydrates). Dünnschicht-Chromatographie InCom Sonderband 1996, 139-147. HPTLC of thermolysates of sugars (1,6-anhydroglucose, D-glucose, dextrin and starch) on silica with a two-step resp. a 23-step AMD development based on chloroform-methanol-water. Detection by spraying with aniline-diphenylamine-phosphoric acid and drying for 5 min at 105 °C. Quantification by densitometry at 385 nm.

Z Lebensm. Unters. Forsch. 203, 95-98 (1996). TLC of guarana oil components (i.a. carvacrol, estragole, anethole, limonene, caryophyllene, copaene) on silica with chloroform or benzene; detection by spraying with anisaldehyde and with phosphomolybdic acid solution. For TLC of urinary metabolites of guarana a mixture of butanol - acetic acid - water 4:1:5 was used for ninhydrin-positive substances, and ethyl acetate - methanol - NH3 85:10:59 for amphetamines.

Acta Chromatographica 14, 60-69 (2004). TLC on silica gel with 1-butanol - glacial acetic acid - water 3:1:1 with chamber saturation. Detection by spraying with ninhydrin reagent (0.3 g ninhydrin in 100 mL 1-butanol plus 2 mL glacial acetic acid), followed by heating at 110 ºC for several min. Quantification by densitometry at 495 nm. Validation of the accuracy by analysis of spiked blank and standard addition samples and precision by performing replicate analysis on a single day and on different days. Recoveries and RSD for spiked blank and standard addition samples were 98.8 % and 98.5 %, 1.92 % and 0.67 %, respectively. Discussion of use of the method for the routine quality control of nutritional supplements.

J. Planar Chromatogr. 17, 207-212 (2004). HPTLC of malvidin 3-glucoside, cyanidin 3-glucoside, delphinidin 3-glucoside, peonidin 3-glucoside,and petunidin 3-glucoside on silica gel with ethyl acetate - formic acid - twice distilled water 17:2:3 in an unsaturated twin trough chamber. After drying detection with methanolic 2,2-diphenyl-1-picrylhydrazyl reagent. Quantitative determination by videodensitometry.