J. Liq. Chromatogr. & Rel. Technol. 26, 147-156 (2003). HPTLC of monensin and lasalocid residues on silica gel with ethyl acetate - hexane 8:3. Visualization by spraying with 5% methanolic vanillin solution and sulfuric acid 199:1 and heating at 90°C for 5 - 15 min. Quantitation by densitometry at 500 nm. Limit of detection was determined at 0.2µg/g for monensin and 1.0 µg/g for lasalocid. The method appears to be specific, linear, repeatable and reproducible, sensitive, convenient and simple to use.

CBS 107, 9-10 (2011). Extraction of pesticides from fruit and vegetable samples by QuEChERs method. TLC of acetamiprid, azoxystrobin, chlorpyriofos, fenarimol, mepanipyrim, penconazole and pirimicarb on amino phase aluminum foil (prewashed with acetonitrile) with acetonitrile over a migration distance of 75 mm in the first direction. After drying development in the backwards direction over 45 mm with acetone. Evaluation under UV 254 nm, UV 366 nm, white light and under UV 366 nm after immersion in primuline solution. Extraction of the target zone by TLC-MS interface with acetonitrile - 10 mM ammonium formate 1:1. Average recoveries of the seven pesticides were 90-104 % with %RSD of 0.3-4.1 % (n = 5). This new high-throughput planar solid phase extraction method for multi-residue analysis of pesticides in food allows a rapid and efficient clean-up at low costs and low solvent consumption.

J. Agric. Food Chem. 32, 231-237 (1984). TLC of molinate and metabolites on silica with a) benzene - methanol 9:1, b) 1-butanol - acetic acid - water 4:1:1. Detection by UV. Autoradiography.

J. Agric. Food Chem. 33, 1049-1055 (1985). Two-dimensional TLC of benfuracarb and 19 metabolites on silica with, e.g. benzene - ethyl acetate 19:1 and benzene - methanol 19:1; benzene - methanol 19:1 and dichloromethane - acetonitrile - ether 2:1:1. Detection by UV and quantification by radiochromatography.

Chinese J. Chem. Reag. (Huaxue Shiji) 10, 163-166 (1988). A review with 29 references concerning in situ fluorimetric methods for the determination of pesticides by TLC. Direct detection of some aromatic pesticides using their natural fluorescence induced by treatment with heat, acids, bases, or inorganic salts. Indirect detection of nonfluorescent pesticides by spraying fluorescence reagents, or by derivatization reactions with labeling reagents such as dansyl chloride.

Chromatogr. Sci. 55, 663-715 (1991). A review with 180 references on chromatographic methods for the detection and identification of pesticide residues in food and feed. TLC methods are emphasized.

J. Planar Chromatogr. 7, 415-418 (1994). TLC on silica with acetone - hexane 1:4 or mixtures of butanol, acetic acid, water (upper layer). Detection by spraying first with diazotized PNA (p-nitroaniline, 0.05% solution in 1:4 hydrochloric acid) and then with sodium hydroxide solution; carbaryl was sprayed with diazotized I-acid (6-amino-1-naphthol-3-sulfonic acid), and then with sodium hydroxide. Quantification after elution, by spectrophotometry at 610 and 540 nm. This method is rapid, sensitive, highly reproducible, and free from interferences from various other pesticides.

Part 3: Solid phase extraction and affecting factors. Acta hydrochim. hydrobiolog. 22, 216-223 (1994). The German standard, DIN 38407, part 11, is based on sample preparation with solid phase extraction, AMD for separation of pesticides and densitometric detection. Factors influencing the solid phase extraction, like the ratio amount of sorbent and sample volume, the flow rate, the company or batch dependence, respectively, or the concentration of the eluate, are discussed.