Anal. Bioanal. Chem. 412, 4527-4536 (2020). HPTLC of 20 chemicals representative of migrants from plastic food contact materials on silica gel with chloroform - acetone - petroleum ether 11:5:5. Yeast estrogen screen was performed by spraying with yeast culture, followed by incubation at 30 ºC for 3 h. Detection by spraying with the indicator (2 mL 0.5 mg/mL 4-methylumbelliferyl-β-D-galactopyranoside-MUG in lacZ buffer), followed by incubation at 37 ºC for 20 min. Qualitative identification under UV light at 366 and 550 nm. The method was more sensitive than a microtiter plate YES (lyticase-YES). 

Chem. Asian J. 15(19), 3044-3049 (2020). The studied rotaxane combines a dibenzocrown of 8 ethers (DB24C8) with an axle chain (Ax) containing two amines, one of them in an aniline group, allowing stability of the rotaxane even when the other one is unprotonated. TLC on silica gel in 4 steps, with detection under UV light or after derivatization with phosphomolybdic acid in ethanol. (1) Before the synthesis of the rotaxane, unprotonated Ax was isolated by preparative TLC of the protonated Ax obtained by addition of HCl or toluenesulfonic acid (TsOH); the mobile phases were chloroform – methanol 10:1 and toluene – tetrahydrofurane 3:2, respectively. The isolated molecules were confirmed as totally unprotonated Ax by NMR, suggesting a complete loss of HCl and TsOH on the silica gel layer. (2) After synthesis, unprotonated rotaxane, pure vs. monoprotonated by the addition of 10 different acids (and purified by column chromatography CC), was applied on TLC plates and developed with dichloromethane – acetone – water 3:16:1; the hRF values were very different, depending on the counter-anions from the used acids. (3) The same behavior (except with sulfuric acid) was observed under the same conditions when CC was omitted (unprotonated rotaxane samples were mixed with each of the acids, or with two acids at the same time for acid-competitive TLC analysis). (4) When unprotonated rotaxane was applied under the same conditions as in step (3) with the sodium salts instead of the acids, the behavior was similar (except for the shapes of the spots, due to the salts in excess). The rotaxane can thus be used for the TLC separation and detection of sodium salts, by forming salts of protonated rotaxane with the anion afforded by these sodium salts. The rotaxane protonation seems to be promoted by the methanol of the spotting mixture; indeed, when step (3) was performed with the mobile phase chloroform – methanol 10:1, a second zone appeared because methanol formed a salt with the rotaxane (identified by NMR).

J. of Chromatogr. A 1568, 188-196 (2018). Mass spectra by DART-MS were recorded directly in situ the bioautogram, immediately after direct bioautography (DB). This allowed to detect bioactive analytes within the bioautogram and discriminate microorganism cells and polar bioassay medium ingredients which could otherwise stress the MS system. DB-DART-MS was used for bioactive compounds in cosmetics using the Bacillus subtilis and Aliivibrio fischeri bioassays for detection of Gram-positive and Gram-negative antimicrobials. Planar yeast estrogen screen was used for detection of estrogen-effective compounds. HPTLC-DART-MS of parabens in hand creams either on silica gel with petroleum ether - glacial acetic acid 20:3 or on RP-18W with methanol - water 1:1. Detection under UV 254 and 366 nm. Bioassay by immersing the neutralized chromatograms into the bacterial suspensions.

J. Planar Chromatogr. 21, 379-385 (2008). Magnetic fields can affect the retention and shape of the chromatographic bands of the solutes investigated. The effect depends on the type of mobile phase, the properties of the adsorbent layer and the mode of development of the chromatogram (development distance). TLC and HPTLC of diphenyl, pyrene, benzo[a]pyrene, phenanthrene, fluoranthene, and chrysene on silica gel with n-hexane, n-octane, carbon tetrachloride, cyclohexane, benzene, and toluene, and n-hexane - benzene and n-hexane - toluene binary mobile phases. Evaluation under UV light.

J. High Resol. Chromatogr. 8, 265-266 (1985). Description of gravity flow circular TLC for preparative separations by which the polycyclic aromatic hydrocarbon fraction of a creosote extract is isolated. A 200 Ál concentrated extract spotted at the center of the plate positioned 1 cm beneath the stem of a separation funnel. The spot was eluted with hexane, and the PAH-band focused with benzene. Detection under UV light.Polycyclic aromatic hydrocarbons, preparative TLC.

Phytochemistry 28, 215-219 (1989). TLC on silica with dichloromethane - butanol 19:1. Detection by spraying with 10% solution of Ce(SO4)2 in 1M sulfuric acid and under UV 254 nm.

J. Chromatogr. 580, 229-255 (1992). Discussion of the methods for the biological monitoring of aromatic hydrocarbons and their metabolites in human blood and urine by TLC, GC and HPLC.

J. Planar Chromatogr. 10, 38-43 (1997). Under TLC conditions a mixture of C60 and C70 fullerenes can be separated on NH2, RP-18 and diol plates and on neutral and basic alumina by use of such eluents as hexane and i-octane and their mixtures with xylene or 1,2-dichlorobenzene. Chamber saturation has a negative influence on the separation. The separation of C60 and C70 fullerenes on silica, however, is achieved by developing the plate with hexane containing 5% pyridine (or iso-octane - pyridine 95:5) in a saturated chamber. The quantity of substance in the starting spot should not exceed 0.4 - 0.5 µg. Detection by densitometry at 254 and 366 nm.