J. Planar Chromatogr. 9, 136-137 (1996). TLC of benzylideneacetone on RP-18 silica with methanol - water 7:3. Quantification by densitometry at 285 nm. Sensitivity 0.0050% for visual screening and 0.0017% for quantification by direct spotting.

infected cotton lint by HPLC - UV/FL. J. Agric. Food Chem. 46, 1071-1075 (1998). TLC of kojic acid and derivatives on cellulose with formic acid - ethyl methyl ketone - tert. butanol - water 3:6:8:3. Detection under UV 254 and 366 nm. After elution, lyophilisation and HPLC analysis.

J. Planar Chromatogr. 19, 467-468 (2006). TLC of carbaryl (1-naphthylmethylcarbamate), a common derivative of the widely used N-methylcarbamate insecticide, on silica gel with n-hexane - acetone 4:1 in a saturated twin-trough chamber. After drying the plate was heating at 100 °C for 5 min, cooled, and sprayed successively with 5 % sodium hydroxide solution and with a 1:1 mixture of 2 % diphenylamine solution and 5 % formaldehyde solution. Visual detection of the blue-green zones carbaryl.

(Oxidation of nicotine and chelating agent by mercury(II)-compounds). Pharmazie 62, 7-13 (2008). TLC of nicotine on silica gel with chloroform - ethanol - ammonia 80:20:1. Detection by spraying with Dragendorff reagent. TLC of iminodiacetic acid on silica gel with n-propanol - water 7:2 or with n-butanol - acetic acid - water 4:1:1. Detection by spraying with ninhydrin reagent.

J. Planar Chromatogr. 22, 457-458 (2009). TLC of monocrotophos and biological extracts, dimethoate, endosulfan, carbaryl, and cypermethrin on silica gel with chloroform - acetone 7:3 with chamber saturation. Detection by spraying with 5 % sodium hydroxide solution followed by 5 % benzil reagent (5 g benzil in 100 mL acetone) and heating at 100 °C for 10 min. Monocrotophos was detected as a pink zone in daylight.

J. Planar Chromatogr. 24, 113-115 (2011). TLC of dichlorvos on silica gel with cyclohexane - acetone - methanol 16:6:1. Detection by spraying with 2 % sodium hydroxide solution and subsequent spraying with 2 % thiobarbituric solution followed by heating at 90 °C for 10 min. The hRf of dichlorvos was 50. The limit of detection was approximately 18 µg/zone. Spectrophometric analysis of dichlorvos was performed by measuring the absorbance of the sample solution. The linearity was in the range of 50-350 µg/mL dichlorvos. On alkaline hydrolysis dichlorvos forms dimethylphosphoric acid and dichloroacetaldehyde; the latter reacts with 2-thiobarbituric acid to give a sharp pink spot. The reagent is selective for dichlorvos, and does not react with other organophosphorus, organochlorine, carbamate, and synthetic pyrethroid insecticides.

J. Planar Chromatogr. 25, 262-268 (2012). HPTLC of paraquat (1), diquat (2), difenzoquat (3), mepiquat (4), and chloromequat (5) in water on silica gel with 1-propanol - methanol - 2.5 N NaCl 1:1:3. Quantitative determination by absorbance measurement between 500 and 535 nm. The hRf values of compounds (1) to (5) were 21, 30 36, 52 and 56, respectively. Limits of quantification were 5 ng/zone for (1), 2 ng/zone for (2), 25 ng/zone for (3), 15 ng/zone for (4) and 9 ng/zone for (5). Recovery rates for compounds (1) to (5) were 50.7, 65.2, 59.6, 45.1 and 33.7 %, respectively.

J. Planar Chromatogr. 27, 477-479 (2014). HPTLC of N,N-dimethyltryptamine in seized street samples on silica gel with methanol – ammonia 200:3. Quantitative determination by absorbance measurement at 220 nm. The hRF value of N,N-dimethyltryptamine was 50. Linearity was in the range of 11.5-34.2 μg/zone. The intermediate precisios were below 5 % (n=3). The LOD and LOQ were 3.3 and 9.9 μg/zone, respectively. Mean recovery was 117.9 %.