J. Planar Chromatogr. 22, 133-135 (2009). HPTLC of monocrotophos on silica gel with chloroform - acetone 7:3 with chamber saturation. Detection by spraying with 20 % sodium carbonate followed by acidic methanolic iron chloride reagent. Evaluation of purple spots, while organophosphorus, organochlorine, carbamate, and pyrethroid insecticides were not detected as purple spots. Alkaline hydrolysis of monocrotophos yields one molecule each of O,O-dimethylphosphoric acid and N-methylacetoacetamide. After acidiification N-methylacetoacetamide yields the enol form of monomethylamide which reacts with ferric ions to a purple complex. The detection limit for monocrotophos is 0.5 µg/zone.

J. Microchem. 34, 211-218 (1986). TLC of dimethoate and oxygen analog, dioxathion, fonofos and oxygen analog and oxydemetonmethyl on silica with 2,2,4- trimethylpentane - methylcyclohexane - isoamyl alcohol - paraffin oil - acetone 4:2:2:3:1 and heptane - xylene - benzene - toluene - cyclohexane - methylcyclohexane 1:1:1:1:1:1. Detection by spraying with ammoniacal silver nitrate solution in acetone followed by exposure to long-wave UV after drying at 100 °C for 2-3 min.

J.A.O.A.C. 71, 949-953 (1988). TLC of ochrotoxin A on RP18 with methanol - water (adjusted to pH 2.1 with phosphorus acid) 70:30. Detection under UV 366 nm. Quantification after scraping of spots and elution.

AOAC Int. 80, 688-692 (1997). TLC of disulfoton, phorate, terbufos, terbufos sulfoxide, terbufos sulfone, terbufos oxon sulfoxide, terbufos oxon sulfone on silica with toluene, toluene - acetone 17:3, toluene - acetone - methanol 18:1:1, and chloroform - methanol 46:1. Detection by spraying with PdCl2-reagent and immediately exposure to iodine vapor. An alternative method was Ackermann's esterase inhibition technique (porcine or bovine liver as enzyme source, 2-naphthylacetate as substrate, and fast blue salt B as coupling reagent for released 2-naphthol). Detection by esterase inhibition gave detection limits in the nanogram and subnanogram range.

J. Planar Chromatogr. 22, 77-82 (2009). Detection of carbamates (carbaryl, propoxur, and carbosulfan) on silica gel activated at 110 °C for 5 min in the oven. After application the pesticide solutions were hydrolyzed by addition of 2 µL of 2 M sodium hydroxide solution. After 5 min, 5 µL diazotized p-aminoacetanilid was applied onto the spots to form the colored derivatives - red, yellow, and yellow-orange for carbaryl, propoxur, and carbosulfan, respectively. The plates were then placed horizontally in an oven at 110 °C and the colored derivatives migrated as concentric rings under the influence of the temperature gradient.

J. Agric. Food Chem. 34, 702-706 (1986). Separation of (14C) coumaphos and (14C) chlorferon on (an acetone - washed) silica plate with benzene - ethyl acetate 9:1. Detection and determination of purity by autoradiography.

J.A.O.A.C. 71, 957-961 (1988). Two-dimensional TLC of aflatoxin B1, B2, G1, G2 on silica with diethyl ether - methanol - water 94:4.5:1.5 and chloroform - acetone 9:1. Detection under UV.

J. Chromatogr. B 704, 361-373 (1998). HPTLC on silica gel with 1) hexane - acetone 4:1, 2) toluene and on RP-18 silica gel with methanol - water 7:3. Detection under UV 254 nm and by spraying with 2% 4-(4-nitrobenzyl)pyridine in acetone and heating at 110°C for 5 min, or with 5% PdCl2 in 10% HCl. Measurement of Rf values. Investigation of the detection limits for some insecticides.