J. Planar Chromatogr. 29, 221-226 (2016). HPTLC of malathion (1) and fenthion (2) in apple and orange juice on silica gel with n-hexane – acetone 3:2. Detection by spraying with 6 % sodium azide, 0.25 % starch, pH 6.5 for (1) and 0.5 % sodium azide, 2 % starch,_x000D_ pH 6.0 for (2), followed by exposure to iodine vapors for 15 s. The chromatograms were scanned at 300 dpi. The hRF values for (1) and (2) were 51 and 48, respectively. Linearity was in the range of 1.0-7.3 μg/zone for (1) and 2.5-24.8 μg/zone for (2). Intermediate precisions were below 3.1 %. The LOD and LOQ were 242 and 807 ng/zone for (1) and 588 and 1960 ng/zone for (2), respectively. Recovery was in the range of 94.8-105.4 % for (1) and 84.2-104.0 % for (2).

Detection by UV or spraying with 0.1 % PdCl2 in 10 % HCl containing the same amount of ethanol (100 °C, 10 min), and with 2 % 4-nitrobenzylpyridine in acetone (110 °C, 15 min), then spraying with 10 % tetraethylenepentamine in acetone).

J. Liquid Chromatogr. 13, 1983-1989 (1990). TLC on silica with hexane - acetone 4:1. Detection by dipping for 5 seconds into a 5% methanolic solution of magnesium chloride, air drying, and dipping into a hexane solution of 0.3% N,2,6-tri-chlorobenzoquinoneimine and heating at 110 °C for 10-15 min. Quantification by densitometry. Detection limit 100 ng.

J. Planar Chromatogr. 13, 314-316 (2000). TLC of DDT, methoxychlor, methylparathion, parathion, lindane, chlordane, diazinon, malathion, endosulfan and phorate on silica gel with n-heptane - acetone 4:1. Detection under UV 254 and 366 nm. Optimum conditions for simultaneous separation and identification of organochlorine and organophosphorus insecticides. Fast, simple, inexpensive, precise method.

J. Planar Chromatogr. 29, 429-434 (2016). HPTLC of chlorpyrifos (1) insecticide and its metabolite 3,5,6-trichloropyridinol (2) in visceral samples on silica gel with n-heptane – acetone 1:1. Quantitative determination by absorbance measurement at 300 nm. The hRF values for (1) and (2) were 64 and 54, respectively. Linearities were between 0.5 and 4 μg/zone for (1) and 0.05 and 0.4 μg/zone for (2). The intermediate precisions were below 2.9 % (n=3). The LOQs were 1.5 μg/zone for (1) and 0.15 μg/zone for (2). Recoveries ranged between 84 and 91 % for (1) and 80 and 93 % for (2).

Hungarian Scientific Instruments 61, 23-26 (1986). HPTLC and OPTLC of aflatoxins G1, G2, B1 and B2 on silica with ethyl acetate - chloroform - THF 15.10:1. Densitometry by fluorescence 366/>440 nm.

J. Planar Chromatogr. 3, 354-356 (1990). HPTLC of 18 organophosphorus pesticides on silica with hexane - acetone 3:1, 9:1, 4:1, and benzene - acetone 33:17. Detection by spraying with a solution of 10 mg esterase-1, B. subtilis, in 10 mL sodium hydroxide - boric acid buffer, pH 9, and placing the plate in a moist chamber horizontally for 30 min at 20 - 23°C, then spraying with a solution of 10 mg of 1-thionaphthyl acetate in 10 mL of acetone, and with a solution of 20 mg of 2,2'-azo(1-naphthol-8-chloro-3,6-disulfonic acid) 4,4’diphenyl disulfide in 10 mL water Assessment by visual comparison with standards.

J. Planar Chromatogr. 14, 210-212 (2001). HPTLC of monocrotophos and other organophosphorus insecticides (malathion, ethyl parathion, methylparathion, fenitrothion fenthion, phorate, dimethoate, phosphamidon, dichlorvos), organochlorine insecticides, carbamate insecticides, pyrethroid insecticides on silica gel in a pre-saturated chamber with chloroform - acetone 7:3. After drying the plate is sprayed with a 20% anhydrous sodium carbonate solution then with 0.5% chloranil (in acetone) reagent. The reagent is selective for monocrotophos among other insecticides.