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.

Molecules, 26 (24), 7683 (2021). Samples were ultrasound-assisted extracts of fruit puree and juice (pre-treated with sulfur dioxide or ascorbic acid) of Ananas comosus (Bromeliaceae) and Mangifera indica (Anacardiaceae). HPTLC on silica gel with toluene – ethyl acetate – methanol – formic acid 120:90:35:3. Detection under white light, UV 254 nm and 366 nm, before and after  derivatization by immersion (2 s, 3 cm/s) into anisaldehyde sulfuric acid reagent and  diphenylamine aniline reagent, followed by heating at 110 °C for 5 min. Effect-directed analysis using automated immersion: A) for free radical (DPPH•) scavengers; B) for enzymatic inhibition (acetyl-cholinesterase, tyrosinase); C) for activity against Gram-negative (Aliivibrio fischeri bioluminescence assay) or Gram-positive bacteria (Bacillus subtilis bioassay). Active compounds were far more present in puree than in juice extracts, and differences were also seen between cultivars. Ascorbic acid (hRF 37), used as additive for the mango puree, was active as antioxidant and as transiently disruptive for A. fischeri metabolism and bioluminescence.

Helv. Chim. Acta 80, 1144-1152 (1997). TLC of monoterpene glycosides on silica with butanol - propanol - water 2:1:3. Detection under UV 254 and 365 nm or with Godin reagent. TLC autographic assay for the detection of free radical scavenging properties by spraying with a 0.2% solution of DPPH (2,2-diphenyl-1-(2,4,6-trinitrophenyl)hydrazyl) in methanol. After 30 min, active compounds appear as yellow spots against a purple background.

J. Planar Chromatogr. 17, 244-249 (2004). TLC of thirty compounds (coumarin derivatives) including by-products on silica gel with ethyl acetate - hexane 2:3 or, for more polar synthesized compounds, with methanol - dichloromethane 7:93 in a saturated chamber. Detection under UV light at 254 nm, and by derivatization if necessary, e. g. by iodine reagent. Quantitative determination by densitometry at 292 - 363 nm. Direct screening of the reaction mixture on the plate for antioxidant activity against the 1,1-diphenyl-2-picrylhydrazyl (DPPH) test radical.

Bunseki Kagaku (Jap. Anal. Chem.) 37, T87-T91 (1988). Reversed-phase TLC of Zn dialkyldithiophosphates and polymer additives on C-18 silica with water - acetone mixtures and dichloromethane mixtures. Detection by spraying with 2,6-dichloroqinone chlorimide reagent and with sulfonic acid, resp.. Also TLC on silica with benzene - methanol mixtures. Detection by spraying with sulfonic acid and pinacryptol yellow reagent. Also TLC of succinic acid derivatives, organic dispersants on silica with ethyl ether - benzene - acetic acid mixtures. Detection by spraying with ninhydrin and heating at 120°C.

J. Planar Chromatogr. 7, 469-471 (1994). TLC of residues from petroleum products (e.g. petrol (gasoline), kerosene, diesel) generally encountered as accelerants in homicidal or suicidal fire and arson cases. Ether extracts obtained either directly from partially burnt objects or by extraction of steam distillates from similar samples were chromatographed. TLC on silica with heptane or isooctane, inspection under UV, then in daylight after spraying with chromic acid followed by rhodamine spray reagent.

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.