Phytochemistry 28, 67-69 (1989). TLC of oleuropein, dimethyloleuropein and elenolic acid glucoside on silica with ethyl acetate - methanol - water 200:33:27. Visualization by spraying with p-toluene sulfonic acid (1%) and vanillin (2%) in ethanol.

Determination of organo-phosphorus ester in food products originating from animals.) (Hungarian). MSZ (Hungarian Norm), 14475/44, 15 (1988). TLC of trichlorphon, dimetoat, dichlorphos, diazinon, malathion, methylparathion, parathion and bromofos on silica with benzene - acetone 95:5, hexane - acetone 6:4 or 85:15. Detection by enzymatic method (colinesterase + ß-naftilacetate). Detection limit 1-10 ng organo-phosphorus ester.

Biochemical Systematics and Ecology 18, 87-92 (1990). TLC of polar lipids on silica with chloroform – acetone – methanol – formic acid – water 100:40:20:20:8 in the first direction and with acetone – benzene – formic acid – water 200:30:3:10 in the second direction. Visualization by spraying with 10% sulfuric acid in methanol.

J. Agric. Food Chem. 38, 979-981 (1990). TLC on prechanneled plates (with differing widths and preadsorbing spotting zone with hexane for 16 - 18 h in a developing tank allowing the evaporation of the solvent. After drying immediat development to a height of 12 cm in a tank saturated with a freshly prepared solution of 1.5 % methanol in benzene. Visualization under UV 254 nm. GC after extraction.

J. Planar Chromatogr. 3, 173-176 (1990). Improvement of a TLC method: Rapid quantitative HPTLC of glucose, fructose, and other common sugars on silica by single or multiple developments with acetonitrile - water 17:3 containing various amounts of 2-aminoethyl diphenylborate (NST). Best results with a solvent containing 1,5 mmol/1 NST, 5 % methanol, and phosphate buffer (pH 5.5) instead of water. Time requirement for 18 samples of glucose, fructose, and saccarose including manual application and evaluation 45 min. Detection by immersion of the dried plates for 10 s in DAP (2 % diphenylamine and 2 % aniline in methanol - 85 % phosphoric acid 8:2 and heating at 120 °C for 10 min. Quantification by densitometry (absorbance at 440 and 515 nm).

J. Planar Chromatogr. 4, 259-261 (1991). TLC of citral on silica with hexane – chloroform 7:3. Quantification by densitometry (absorbance) at 250 nm.

Jap. Hygienic Chem. (Eisei Kagaku) 37, 542-551 (1991). Description of a systematic method for detection of 15 artificial dyes and 19 natural dyes in foods. Extraction with water followed by dichloromethane. Fractionation of water-soluble dyes by polyamide chromatography, and of oil-soluble ones by liquid-liquid, silica, and alumina column chromatography. Identification of the dyes in each fraction by TLC. The method is simple and can be applied to various kinds of food.

J. AOAC Int. 76, 335-341 (1993). TLC of sulfamethazine and sulfabromomethazine on silica with ethyl acetate 1:1; detection after mechanical dipping at low speed for 2 s in 100 mL fluorescamine solution (25 mg in 10 mL acetone, to which 90 mL hexane is added). The dipped plate is dried 5 min. with nitrogen, then sprayed with 0.2 M H3BO3 (pH adjusted to 8.0 with 1 M NaOH), placed in - 20°C freezer for 5 min. before densitometry in fluorescence mode. Estimation of detection limit 0.25 ppb.