J. Planar Chromatogr. 33, 329-340 (2020). Review of analysis of heavy metal ions by TLC, including micellar, soil and reversed-phase TLC between 2000 and 2019. The review highlighted the better performance of micellar TLC and the use of cationic and anionic surfactants.

J. Planar Chromatogr. 32, 421-429 (2019). HPTLC of levamisole (1), pyrantel pamoate (2), albendazole (3), and febantel (4) on silica gel with dichloromethane - methanol - formic acid 18:1:1. Quantitative determination by absorbance measurement at 254 nm. The hRF values for (1) to (4) were 10, 15, 47 and 79, respectively. Linearity was between 600 and 1500 µg/L for (1), 400 and 1000 µg/L for (2), 200 and 1000 µg/L for (3) and (4). The obtained RSD values were in the range from 7.0 % to 8.8 % for intra-day precision and from 8.1 % to 13.1 % for inter-day precision (n=3). The LOD and LOQ were 300 and 600 µg/L for (1), 200 and 400 µg/L for (2) and 100 and 200 µg/L for (3) and (4), respectively. Recovery rate was above 95 % for (1) to (4).

J. Planar Chromatogr. 32, 173-182 (2019). HPTLC of chlorinated metformin samples with genotoxic effect obtained by umu assay (Salmonella typhimurium TA1535/pSK1002 Assay) on silica gel in a gradient development with methanol - formic acid 2000:1, dichloromethane and n-hexane. A TLC-MS interface was used for further analysis by LC-high-resolution mass spectrometry. 

J. Chromatogr. A 1524, 273-282 (2017). Application of effect-directed analysis (EDA) to assess the effects of a substance via in-vitro bioassays, thus to provide information about the relevance of the substance to the ecosystem. Development of selective two-dimensional (2D) HPTLC-EDA to increase the peak capacity and facilitate the identification of effective compounds in environmental samples of high complexity. Selection of effective zones in the first dimension in terms of heart-cutting and transfer to the second dimension through elution head-based extraction. Development and validation of three 2D approaches by using the retardation factors of the first dimension to adjust the mobile phase for the second dimension, achieving the best results in terms of peak capacity and orthogonality. Exemplarily shown for acetylcholinesterase (AChE) inhibition, the analysis of spiked surface water by 2D HPTLC-EDA allowed to assign zones with neurotoxic effects to the corresponding substances. The results proved that the 2D separation reduced the complexity of effective zones and thus facilitated the subsequent identification of effective compounds, and provided knowledge about a substance effect enabled assessment of its relevance to the environment.

J. Planar Chromatogr. 9, 203-207 (1996). TLC and OPLC of hydroxy derivatives of polycyclic aromatic hydrocarbons (1-naphthol, 2-naphthol, 2,3-dihydroxynaphthalene, 2,7-dihydroxynaphthalene, 1,3-dihydroxynaphthalene, 1,5-dihydroxy-naphthalene, 9-hydroxyphenanthrene, 1-hydroxypyrene) on RP-18 with acetonitrile - water 1:1 or 3:2 and methanol - water 3:1 for planar chromatography and acetonitrile - water 3:2 for OPLC. Visualization under UV 254 and 365 nm; the plates were then sprayed with fast blue B salt solution and observed again under UV 365 nm.

CBS 85, 10-11 (2000) HPTLC-AMD of water samples on silica gel with 33-step gradient from acetonitrile - ammonia to dichloromethane and dichloromethane - acetic acid to n-hexane. Detection via Chrom Biodip (Merck) by dipping in bacteria solution (Bacillus subtilis) followed by incubation at 30 °C over night and spraying with MTT-tetrazolium salt reagent followed by incubation at 30 °C for 5-30 min. Visual evaluation.

Acta Chromatographica No. 7, 149-158 (1997). TLC of nitro- and azaarenes (nitronaphthalene, nitrofluorene, nitroanthracene, nitropyrene, quinoline, azafluorene, benzo(h)quinoline) on silica with acetonitrile - water 9:1 for nitroarenes and methanol - water for azaarenes. Detection under UV 254 and 366 nm and by spraying with specific reagents for the detection of functional groups: 15 % tin(II) chloride in 36 % hydrochloric acid and p-dimethylaminobenzaldehyde for nitroarenes and Dragendorff's reagent for azaarenes. Detection limit for nitroarenes 25 - 100 ng, for azaarenes 50 - 100 ng.

CBS 113, 5-7 (2014). HPTLC/AMD as a screening method to identify previously unconsidered_x000D_
substances. HPTLC of water samples on silica gel LiChrospher in the AMD 2 with a 25-step gradient, starting in the isocratic mode with 5 steps acetonitrile – dichloromethane 1:1 for focusing, followed by 15 steps from acetonitrile – dichloromethane 1:1 to dichloromethane and then 5 steps from dichloromethane – n-hexane 4:1 to n-hexane. Final migration distance 80 mm. Detection under UV 254 nm, UV 366 nm and white light. Densitometric evaluation by absorbance measurement at 190, 200, 220, 240, 260, 280, and 300 nm. Target zones were eluted with the TLC-MS Interface offline with water – acetonitrile 1:1 and deuterium oxide – acetonitrile 1:1, respectively, each with an addition of 5 mmol/L ammonium acetate, at a flow rate of 0.2 mL/min using the oval elution head (4 x 2 mm) for analysis with a QTOF/MS. With the molecular formula information, different databases were searched and H/D exchange (replacing protons in the molecule by deuterium which leads to a mass shift in the ESI MS spectra) was used to reduce the quantity of possible structures.