(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.

Analyst 119, 2737-2741 (1994). Description of Charm Test II receptor assays and TLC-bioautography for ß-lactams, sulfonamides, (dihydro)-streptomycin and erythromycin applied to 257 bovine muscle and kidney samples, and 215 porcine muscle and kidney samples. Quantification of penicillin G by HPLC, and of sulfonamides by TLC with fluorescence densitometry. Comparison of the analysis time, operating costs, etc., of different methods.

J. Chromatogr. A 754/1-2, 423-430 (1994). Description of HPTLC in the field of water analysis. A short review with 25 references on the analysis of pesticides by classical TLC is given. Explanation of the principle of automated multiple development (AMD) technique, with a separation number about three times higher than in classical TLC. The focusing effect, the gradient development from polar to unpolar, the increasing migration distances and the universal gradient are described. The strategy of the whole procedure which became a German standard is demonstrated from sample preparation (solid-phase extraction), screening, identification to final confirmation of positive results. With only one HPTLC plate up to 720 analytical answers can be given, that means 6 different standard mixtures of 10 pesticides each are applied on one plate together with twelve samples (screening of 12 samples for these 60 pesticides gives 720 analytical answers). Common gradients and separations of pesticide mixtures, as well as water samples containing pesticides are presented.

CBS 84, 14-15 (2000). HPTLC of wine samples on silica gel with diisopropyl ether - formic acid - water 16:3:1 with chamber saturation. Detection by heating at 110 °C for 15 min, followed by cooling to room temperature and dipping in bromophenol blue reagent. Quantitative determination of malic, lactic, and succinic acid by absorbance measurement at 430 nm.

J. AOAC Int. 86, 602-611 (2003). Review of the advances in the applications of TLC and HPTLC for the separation, detection, identification, and determination of pesticides, other agrochemicals, and related compounds for the period 2000-2002. Analyses are described for a variety of samples, such as food, biological, and environmental samples, and for residues of pesticides of various types, including insecticides, herbicides, and fungicides, belonging to different chemical classes. 88 references are included for residue analysis, hydrophobicity studies, and the use of TLC and thin-layer radio-chromatography for studies of pesticide metabolism, degradation, uptake, and related topics.

J. Chromatogr. A 1045 (1-2), 223-232 (2004). TLC of dansyl derivatives of biogenic amines (agmatine, putrescine, tryptamine, cadaverine, spermidine, histamine, spermine, tyramine and beta-phenylethylamine) with chloroform - diethyl ether - triethylamine 6:4:1, followed by chloroform - triethylamine 6:1. Quantitative determination by fluorescence measurement at 330/>400 nm. Correlation coefficients of linear regressions were higher than 0.99 for all amines, except for agmatine (0.976). Detection limits were 10 ng for tryptamine, tyramine, histamine and ß-phenylethylamine, and 5 ng for the other amines. The overall repeatability of the chromatography was 1.82 % when including agmatine and barely 1.02 % for the other amines. The accuracy ranged from 105.97 % (agmatine) to 49.92 % (tryptamine). This thin-layer chromatography method was found to be an effective and precise analytical procedure to separate and determine biogenic amines. Its main advantages compared to previous procedures are that it uses less harmful solvent (diethyl ether instead of benzene) and can separate a larger group of biogenic amines.

J. Planar Chromatogr. 19, 250-252 (2006). TLC of piperine and chavicine on silica gel with heptane - ethyl acetate 3:2 in unsaturated chambers. Detection under UV light at 254 nm.

by high speed countercurrent chromatography (HSCCC). J. Liq. Chromatogr. Relat. Technol. 28, 1717-1724 (2005). TLC of triterpene saponins (goyaglycoside-e, momordicoside L and momordicoside K, and goyaglycoside-a) on silica gel with methyl tert-butyl ether, n-butanol, methanol, water 1:2:1:5 and 1:3:1:5; and chloroform - methanol - water 15:4:1. Detection by spraying with 5 % ethanolic sulfuric acid followed by heating at 110 °C.