J Chromatogr A, 1624, 461239 (2020). Samples were chemical standards of acetylcholinesterase (AChE) inhibitors (azamethiphos, caffeine, donepezil, galanthamine, methiocarb-sulfoxide, paraoxon-ethyl) and of neurotoxic compounds, as well as drinking or contaminated water samples enriched through solid phase extraction. HPTLC on spherical silica gel (pre-washed twice by 20 min immersion in isopropanol, heated 20 min at 120 °C before and after pre-washing with acetonitrile). First separation (preparative TLC) with automated multiple development (16 steps). Effect-directed analysis for AChE inhibitors by immersion (speed 5 cm/s, time 1 s) into enzyme solution, incubation 5 min at 37 °C and immersion into substrate solution (indoxyl acetate 2 % in methanol); visualization under UV 366 nm. Active zones from untreated layers were eluted through the oval head of a TLC-MS interface to a second plate for a second separation with a panel of other mobile phases. Bands of interest were eluted from the second layer with water through the oval elution head of the TLC-MS interface pump, into a RP18 liquid chromatography guard column, followed by a quadrupole time-of-flight mass spectrometer. Full scan mass spectra (m/z 100–1200) were recorded in negative and positive modes using electrospray ionization (and collision-induced dissociation for MS2). Among the water contaminants, lumichrome (riboflavin photolysis product), paraxanthine and linear alkylbenzene sulfonates were identified as AChE inhibitors.

J. Chromatogr. 609, 355-362 (1992). TLC of block copolymers on silica with different solvent systems. Detection by spraying with 3.3 % solution of potassium permanganate in concentrated sulfuric acid and heating at 180 °C for 15-20 min. Study of the mechanism of the fractionation of two-block AB copolymers (BC). The calculated compositions of the analysed BC correspond to the data calculated from the kinetics of copolymerization and micro column exclusion chromatography.

J. Planar Chromatogr. 22, 171-173 (2009). TLC of waxes (carnauba, candellia, lanolin, japanese, spermaceti, bees, and paraffin) on silica gel with petroleum ether - diethyl ether - acetic acid 90:10:1 with chamber saturation. Detection under UV 254 nm.

J. Planar Chromatogr. 7, 122-125 (1994). TLC of extracts of bituminous substances on silica with dichloromethane. 11 different detection reagents were used for different functional groups (e.g. Dragendorff's reagent for quinolines, acridines, pyridines; UV for PAHs; bromocresol green for carboxylic acids). The samples were examined for the occurrence of basic, neutral, and acidic heterocyclic nitrogen compounds, aromatic hydrocarbons, and oxygen compounds.

CBS 107, 2-4 (2011). To ensure effective cleaning of the reaction vessels in pharmaceutical production wool swabs are used to swipe a defined area of the vessel. The wool swabs are extracted with chloroform and the extracts are applied as rectangles of 4x3 mm. HPTLC on silica gel with toluene - ethyl acetate 3:2 with chamber saturation for 10 minutes. Identification of substances by densitometric spectra recording between 200-350 nm followed by 3-level calibration. Detection by spraying or immersion in methanol - sulfuric acid 9:1 and heating for 5 min at 105 °C. Evaluation under visible light and UV 366 nm.

J. Chromatogr. 678, 119-125 (1994). TLC of ink components on silica with ethanol - acetone - hexane 1:5:20. Evaluation by plotting the calibrated values of the standards against the samples being tested. Determination of the volatile components of the ink by GC.

Journal of Ethnopharmacology 163, 192-202 (2015). TLC of the aqueous extract (crude vs. after tannin removal on a polyamide column) of the kino (red hydrosoluble exudate) of Pterocarpus erinaceus on silica gel with s-butanol – water – acetic acid 14:5:5. Detection with vanillin-hydrochloric acid reagent revealed catechic tannins and related polyphenols as dark pink zones. These compounds showed hRfs between 0 and 40, and above 60 in the case of the crude extract, whereas they almost did not appear in the tannin-free fraction. The extracts were also submitted to HPLC-HRMS, allowing the identification of epicatechin monomer in both extracts and of oligomers in the crude extract only.

J. Planar Chromatogr. 9, 16-24 (1996). TLC of a coal tar pitch on silica with pyridine followed by N,N-dimethylformamide (I) and THF followed by toluene as solvent system after chamber saturation for 30 min; first development 2 - 3 cm, after removal and drying development in the second solvent for a further 2 - 3 cm beyond the first solvent front. Separated sample fractions were examined by size exclusion chromatography, UV-absorbance, and UV-fluorescence spectroscopy.