J. Liq. Chromatogr. Relat. Technol. 41, 1052-1065 (2019). Review of the following topics for the period of November 1, 2016 to November 1, 2018: sample preparation for TLC pesticide analysis; lipophilicity and retention studies for the study of biological activity; new reagents for pesticide detection; HPTLC-effect directed analysis on the surface of the layer; TLC-Raman spectrometry for the analysis of thiabendazole, triazophos, and phosmet residues; TLC analysis of radiolabeled pesticides; methods for the separation, detection, and qualitative and quantitative determination of pesticide residues; determination of pesticides in commercial products and the use of TLC for pesticide degradation studies. The review highlighted the isolation, characterization, and determination of less hazardous and less toxic biopesticides from plants, bacteria, fungi, and soil as the most active application area of pesticide TLC today.

J. Planar Chromatogr. 32(1), 51-53 (2019). TLC of amitraz in visceral tissues (stomach, intestine, liver, spleen, and kidney) on silica gel with hexane - acetone 4:1. Detection by spraying with 10 % sodium hydroxide solution, followed by heating at 80 °C for 10 min. The plate was then removed, kept to attain room temperature and sprayed with 5 % chloranil solution. The hRF values were between 49 and 51. The zones were stable for 8 h.

J. Planar Chromatogr. 22, 333-343 (2009). TLC of brodifacoum, bromadiolone, coumateralyl and impurities on silica gel, alumina, cellulose, and RP-18 with 46 different mobile phases in a twin trough chamber saturated for 30 min. The most selective phases on silica gel were chloroform - ethyl acetate - n-hexane in various ratios, ethyl methylketone- toluene 19, and chloroform - toluene 73; on alumina the best mobile phase was dichloromethane - n-hexane 32. Detection under UV light at 254 nm.

J. Agric. Food Chem. 34, 1057-1060 (1986). Preparative TLC of aziridine derivatives on silica with ethyl acetate - hexane 11 or chloroform - methanol 991. Detection by viewing under UV 254 nm and by iodine exposure.

Fate of 3-phenoxybenzaldehyde Diphenylether cleavage, a major metabolic route in chicken. J. Agric. Food. Chem. 38, 1417-1422 (1990). TLC of 3-phenoxybenzaldehyde and 11 metabolites on silica with ethyl acetate - formic acid - water 3522, hexane - toluene - acetic acid 3152, toluene - ether - acetic acid 75251. Detection by autoradiography. Quantification after methylation using HPLC.

J. Agric. Food Chem. 46, 3623 - 3629 (1998). HPTLC of ANOT (3-amino-5-nitro-o-toluamide) and primary metabolites on silica gel with chloroform - ethyl acetate - methanol 551. Detection under UV 366 nm and by exposure to nitrous acid vapors. Finally the plate was sprayed with a Bratton-Marshal solution (0.4% naphthylethylenediamine dihydrochloride in methanol).

Development and evaluation of Thin-Layer Chromatography-Digital Image-Based analysis for the quantitation of botanic pesticide azadirachtin in agricultural matrixes and commercial formulations Comparison with ELISA. J. AOAC Int. 90, 857-863 (2007). TLC of azadirachtin on silica gel with dichloromethane - ethanol 201. Detection by spraying with acidified vanillin reagent (3 g vanillin in 10 mL ethanol with 1.5 mL concentrated sulfuric acid) followed by heating at 110 °C for 3 min. Quantitation by densitometry.

J. Liq. Chromatogr. Relat. Technol. 33, 980-995 (2010). HPTLC of bronopol and Kathon CG on silica gel (pre-washed with methanol) with methanol - dichloromethane - n-hexane 2127. For detection, luminescent Vibrio fischeri bacteria were cultivated. Plates were dried for 30-40 min at 120 °C on a plate heater and then immersed for 1 s in the bacteria suspension using an immersion device and a glass dip tank. Excess bacteria suspension was removed. Images were taken using the BioLuminizer with an exposure time of 55 s. The effective and reasonably fast quantitative method is in routine use at several laboratories.