J. Planar Chromatogr. 32, 335-338 (2019). TLC of paraquat on silica gel with methanol - ammonia 97:3. Detection by spraying with 1 % phenylhydrazine (0.5 g phenylhydrazine in 50 mL 2 N sodium hydroxide). The hRF value of paraquat was 62. 

J. Planar Chromatogr. 32, 69-71 (2019). HPTLC of oxyfluorfen in visceral tissue on silica gel with hexane - acetone 4:1. Detection by spraying with 5 % stannous chloride solution in hydrochloric acid, followed by heating at 110 ºC for 20 min. After cooling, the plates were sprayed with freshly prepared cooled (0‒5 °C) nitrating mixture of sodium nitrite in hydrochloroc acid, followed by a solution of β-napthol in sodium hydroxide. The hRF value of oxyfluorfen was 61. 

J. Planar Chromatogr. 22, 65-71 (2009). Presentation of two simple and rapid HPTLC methods for early detection of the effects of herbicides using two different groups of plant biomarkers, which were developed as field tests (Herbicide Weed Response test - HWR-Test). Phytochemical changes can be detected before any morphological changes are visible on the plants. These changes are defined as biomarkers and can be detected by HPTLC-screening. After overall identification of the phytochemical biomarker pattern, two different biomarker groups, carbohydrates and amino acids, were detected using modified reagents for color reactions. Evaluation under daylight and videodensitometric analysis of digital images by VideoScan software. The screening method was previously described [H. W. Ravn, M. Hjorth, L. Lauridsen, P. Kudsk, S. K. Mathiassen, L. Mondolot, Bull. Environ. Contam. Toxicol. 75, 236-245 (2005)].

H. TRAITLER, A. STUDER, R.E. KAISER (eds): Instrumental HPTLC, Institute for Chromatography, Bad Dürkheim, FRG (1987), 277-284. TLC of trifluralin and its related compounds on silica with step-by-step chromatography in 5 eluting systems. Identification by densitometric registration, diffuse reflection electronic spectra denstitometry and differential signal resolution densitometry. The solvents used: 1. hexane - dichloroethane 7:3, 2. hexane - diethyl ether 3:1, 3. hexane - toluene 3:1, 4. benzene - acetonitrile - formic acid 130:40:1.5, 5. carbon tetrachloride - acetonitrile - formic acid 50:20:1.

J. Planar Chromatogr. 3, 251-255 (1990). New layer for problematic separation: TLC of 10 organic acid herbicides on silica - calcium sulfate layers 1:4 with different solvent systems. Identification by spraying with alkaline ethanolic solution of bromophenol blue.

J. Planar Chromatogr. 12, 145-149 (1999). TLC of 24 new chlorotriazines on silica gel with 14 different solvents. Visualization under UV 254 nm. Quantitation by densitometry. The proposed procedure can be used not only for monitoring the synthesis and to check the purity of the products but also for the determination of their stability and environmental behavior.

J. Planar Chromatogr. 17, 468-476 (2004). HPTLC of nine s-triazines on RP-18 and cyano phases with aqueous solutions of different organic modifiers (acetone, acetonitrile, tetrahydrofuran, and dioxane). After development the dried plates were examined under UV light at 254 nm. OPLC on RP-8 and RP-18 with water - acetonitrile. The plates were preconditioned in acetonitrile before development.

J. Planar Chromatogr. 22, 59-63 (2009). HPTLC of paraquat, diquat, difenzoquat, mepiquat, and chloromequat on LiChrospher silica gel with 1-propanol - methanol - 2.5 M aqueous sodium chloride 1:1:3. Detection by immersion for 2 s in a solution of 50 mg sodium tetraphenyl borate in 50 mL of water containing 50 µL concentrated hydrochloric acid. The wet plate was illuminated for 5 min with UV light at 254 nm which resulted in the formation of fluorescing spots corresponding to mepiquat, chloromequat, and difenzoquat. Immediately after illuminating at 254 nm all spots were illuminated for 10 min with UV light at 365 nm, which converted all compounds into fluorescent derivatives. Then the dry plate was dipped into ethylene glycol - methanol 1:1 for 2 s, which enhanced the fluorescence by a factor of two. Detection by fluorescence measurement and averaged densitograms were obtained in the emission wavelength range from 440 to 480 nm.