J. AOAC Int. 92, 691-697 (2009). HPTLC of dialkyl phosphate standards (dimethyl phosphate, diethyl phosphate, dimethyl thiophosphate, diethyl thiophosphate and dibutyl phosphate as internal standard) on amino phase, prewashed with methanol, with dichloromethane in a twin trough chamber. Quantitative determination by fluorescence measurement at 366/>400 nm. The limit of quantification was between 0.8 and 1.4 ng/zone. Fluorescence enhancement was achieved by dipping the plate into a 50 % solution of paraffin oil in n-hexane, increasing the sensitivity and resulting in an LOQ of 0.5-0.6 ng/zone.

J. Agric. Food Chem. 34, 79-86 (1986). TLC separation of propetamphos (CE)-O-2-methyl ethyl phosphoramido thioate) and metabolites on silica with hexane - ethanol 95:5, benzene - ethyl acetate - hexane 1:4:2, acetonitrile - water 95:5, 95:25, etc., after development the plates were cut into strips and radioactivity was measured by LSC. Detection of non-radioactive compounds by UV, by exposure to iodine vapors and/or by spraying with DBQ in cyclohexane with heating at 118 °C for 10 min.

Fres.J.Anal.Chem. 336, 515 (1990). TLC of terbufos and its metabolites terbufos sulfoxide, terbufos sulfone, terbufos-O-sulfoxide, and terbufos-O-sulfone on silica with toluene - acetone 85:15. Sensitive detection of terbufos by derivatization with PdCl and by exposure to iodine vapor. For the metabolites, an enzymatic procedure allows more sensitive detection.

J. Planar Chromatogr. 11, 90-93 (1998). Determination of the relationships between Rf values and mobile phase composition for eleven moderately polar pesticides in systems of the type silica + nonpolar or weakly polar diluent (heptane or chloroform) - polar modifier (ethyl acetate, tetrahydrofuran, dioxane, or acetone). TLC of atrazine, chlorfenvinphos, methoxychlor, carbaryl, alachlor, bromopropylate, captan, dinoseb, diuron, fenchlorphos, fenitrothion on silica gel with e.g. ethyl acetate - heptane. Detection under UV at 254 nm or 365 nm or by exposure to iodine vapor. Useful information for isolation of the pesticides tested.

Asian Journal of Chemistry 23(5), 2011-2013 (2011). Methods are reported for determination of organophosphorus pesticides using TLC-cholinesterase inhibition as well as GC-FID. The powdered rice sample was initially extracted with ethyl acetate. The extract was cleaned up by GPC, eluted with cyclohexane - ethyl acetate 1:1, evaporated, and taken up in acetone. This extract was analysed by TLC on silica gel with ethyl acetate to a developing distance of 10-12 cm. After development the plate was air dried, exposed to bromine vapors, sprayed with enzyme solution and incubated at 37 °C for 30 min and sprayed with the reagent. White spots appeared against bluish-red background. The sample was also analysed by GC and the GC method was very sensitive. However, the TLC method is recommended for preliminary screening of samples.

Acta Alimentaria 16, 29-43 (1967). Twenty-one identified strains of fusarium sp. were examined for their ability to produce F-2 and T-2 toxin on sterilized, moistened rice and corn grains. The F-2 and T-2 toxin production was estimated by TLC and confirmed by GLC. TLC of F-2 toxin on silica with toluene - ethyl acetate - chloroform 95:55:50 and chloroform - acetone 97:3; after development plates heated for 5 min. at 120 °C, detection of zearalenone by UV 366 and 254 nm. Detection of F-2 toxin by spraying with 1 % 4-methoxy - benzene - diazonium- fluoroborate and heating for 10 min at 110 °C. Sensitivity: 0.03 mg/spot. TLC of T-2 toxin on silica with toluene - ethyl acetate - 90 % formic acid 6:3:1; spraying with 20 % sulfuric acid in 96 % ethanol and heating for 10 min at 110 °C, detection by UV at 366 nm. Sensitivity: 0.05 mg/spot.

J.Chinese Herb Med. (Zhongcaoyao) 21, 107-108 (1990). TLC of organophosphorus pesticides on silica with ethyl acetate - hexane 3:2. Detection by EL method. Quantification by densitometry at 272 nm. Detection limits 8 ng.

J. Chromatogr. 704, 540-543 (1995). TLC of dichlorvos and dimethoate on silica gel with n-hexane - acetone - methanol 16:6:1 or with benzene - ethyl acetate - methanol 9:1:1. Selective and sensitive detection by spraying with 2% sodium hydroxide solution followed by 0.5% orcinol solution. Heating at 100°C for 10 min. Detection limit under UV 365 nm of 1 µg and 15 µg per spot for dichlorvos and dimethoate, respectively.