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.

J. China Surfac. Deterg. & Cosmet. (Zhongguo Riyong Huaxue Gongye) 1, 42-46 (1992). TLC of six surfactants on silica with acetone - chloroform - methanol - water in different ratios. Detection by spraying with 5-10% phosphomolybdic acid in ethanol, or with Dragendorff reagent, and by densitometry. Investigation of the effect of temperature and relative humidity on retention.

Acta Chrom. 6, 113-115 (1996). HPTLC of trotyl on silica gel (activated at 110 °C) with hexane – benzene 1:1. Several selected visualizing agents were investigated: phenol red, bromphenol blue, thymol blue and bromothymol blue. After spraying, the plates were heated at 100 °C. A low detection limit (1 µg) was obtained by application of phenol red and bromphenol blue. This method enables further possibilities for quantitative determination.

TLC on silica with chloroform -methanol - acetic acid - water 80:10:8:2. Detection by spraying with 2 % eosin in ethanol and by UV.

J. Planar Chromatogr. 5, 263-266 (1992). Description of a simple, effective, and inexpensive TLC method suitable for the analysis of the constituents of fossil hydrocarbons, and especially for the determination of the composition of asphalt. The preparative method described can be used not only for quantification of asphalt, but also for fraction collection. Aspalt (saturates, monoaromatics, diaromatics, polyaromatics, resin-1, resin-2, asphaltenes).

Proc. Intern. Symp. on Planar Separations, Planar Chromatography 2001, pp. 251-263. Observation of evident electrokinetic effects (dielectroosmotic flow) on silica gel layers developed with nonpolar and polar solvents and, as a result, improvement of the separation resolution of nonionic compounds. TLC plates with silica gel R and methanol, ethanol, n-propanol, n-butanol, pentanol, methyl ethyl ketone, benzene and mixtures thereof were used for the experiments.

J. Chromatogr. 392, 407-414 (1987). TLC of phenolic antioxidants on silica with 1) benzene, 2) benzene - hexane 75:25, and 3) benzene - ethyl acetate - acetone 100:5:1. Detection by spraying with N-chloro-2,6-dichloro-p-benzoquinone monoimine. Discussion of the experimental conditions.