J. Sliwiok (ed.): Acta Chromatographica 10, 213-221 (2000). TLC of cypermethrin, deltamethrin, and fenvalerate in wheat on hydrated zirconium oxide layers with different mobile phases. Good separations with methyl acetate - formic acid 4:1, ethanol - hexane 1:1, acetone - cyclohexane 3:2. Derivatization with iodine vapor and o-tolidine reagent. Detection limit was 1 µg (0,1 ppm).

J. Chromatogr. A 1218 (19), 2775-2784 (2011). A multi-enzyme inhibition assay (HPTLC-EI) based on rabbit-liver esterase (RLE) and cutinase following HPTLC allows detection of thiophosphate pesticides. Because choline esterase inhibition is more effective after conversion of thiophosphate thions into their corresponding oxons, a pre-oxidation step was added to the HPTLC-EI assay by using bromine vapor. Bromine was more effective than iodine or UV irradiation for oxidation. It increased the inhibitory strength of parathion, parathion-methyl, chlorpyrifos, chlorpyrifos-methyl, and malathion by 2 orders of magnitude. In contrast, bromine oxidation of organophosphate and carbamate insecticides resulted in a slight reduction in their inhibition factors, due to partial bromination and degradation of the parent compounds. Bromine oxidation increased the inhibition factors for demeton-S-methyl and propoxur. The HPTLC-EI system was applied to the analysis of apple juice and water samples spiked with paraoxon (0.001 mg/L), parathion (0.05 mg/L), and chlorpyrifos (0.5 mg/L) and the mean recoveries were 95-106 % and 91- 102% for RLE and cutinase, respectively.

J. Agric. Food Chem. 32, 208-211 (1984). TLC of buturon (N-(p-chlorophenyl)-N'-methyl-N'-(1-methyl-2-propynyl)urea and metabolites on silica and alumina with a) dichloromethane, b) hexane - acetone 1 7:1, c) benzene - acetone 95:5. Radioactivity. TLC-GC/MS.

J. Agric. Food Chem. 33, 980-987 (1985). TLC and HPTLC of fenpropathrin and metabolites on silica and cellulose using 10 different solvent mixtures, one- or two-dimensional development. Detection by autoradiography, UV or spraying with ferric nitrate, silver nitrate, triphenyltetrazolium chloride or ninhydrin.

VCH, Weinheim (1987), 223 pages. The book is one of the most important publications in the area of toxicological analysis, presenting TLC data for about 1100 toxicologically relevant substances, mainly drugs and pesticides in ten selected solvent systems.

Proc. 6th Int. Symp. Instrum. Planar Chromatogr., (Interlaken 1991), Inst. Chromatogr., Bad Dürkheim, FRG, 143-156 (1991). A review on the determination of plant protecting agents and pesticides in drinking water by means of HPTLC is presented with 50 references.

J. Chromatogr. 668, 495-500 (1994). Determination of the retentions of 26 commercial pesticides by TLC on alumina with hexane - dioxane mixtures, and by HPLC with an alumina column. discussion of the linear intercorrelation between the log k' and RM values of the pesticides with the concentration of dioxane in the eluent.

TLC as valuable instrument for preliminary proceedings suitable for chromatographic systems in HPLC separation problems. Reasons and preconditions for TLC as pilot procedure are given. 62 pesticides of 6 different substance classes, i.e. triazines, phenoxycarboxylic acids, urea herbicides, aniline derivatives, phosphoric acid esters, etc., are used for transmission of retention characteristics to HPLC. TLC of triazines on RP-8 with acetonitrile - water 3:2, of phenoxycarboxylic acids on RP-18 with acetonitrile - water - acetic acid 15:9:1, of urea herbicides on CN with hexane - tetrahydrofuran 3:2, of aniline derivatives on NH2 with hexane - tetrahydrofuran 7:3, of phosphoric acid esters on silica with hexane - tetrahydrofuran 3:2, of further pesticides on diol with hexane - tetrahydrofuran 7:3.