J. Chromatogr. Sci. 54 (9), 1661-1669 (2016). Development of two sensitive and accurate stability-indicating chromatographic methods for the determination of rafoxanide (RFX): 1) by TLC on silica gel with chloroform – ethyl acetate – toluene – ammonia 50:40:3:1, determination by densitometry at 280 nm; 2) by UPLC. Identification of the degradation products by mass spectrometry and IR spectroscopy. Both proposed methods proved to be accurate, robust, specific and suitable for application as stability-indicating methods for routine analysis of RFX in quality control laboratories.

Phytochem. Anal. 29, 5-15 (2018). TLC fingerprint of Ipomoea aquatica on silica gel with methanol – water from 1:1 to 9:1 (1) or methanol with 0.05 % trifluoroacetic acid – water with 0.05 % trifluoroacetic acid 1:1 (2). Detection by spraying with anisaldehyde sulfuric acid reagent. Detection under UV 254 nm, 366 nm, and for (2), white light (yellow bands at hRF 19 and 25). The post chromatographic visualization possibilities indicate the potential of TLC in qualitative fingerprint analysis.

platychlaena fruit essential oils. J. Planar Chromatogr. 31, 61-71 (2018). Overpressured layer chromatography (OPLC) of two Prangos platychlaena ssp. platychlaena fruit essential oils on silica gel with toluene – isooctane 4:1, external pressure 50 bar, flow rate 100 mL/min. Bioautography by spraying with a spore suspension (105 spores/mL) of Colletotrichum species without chemical derivatization, followed by incubation for 4 days at 26 °C with a 12 h photoperiod. Detection by spraying with vanillin–sulfuric acid reagent (0.1 g vanillin in 100 mL ethanol and 2 mL sulfuric acid), followed by heating at 110 °C for 3 min.

J. Liq. Chromatogr. Relat. Technol. 41, 73-82 (2018). Review of the applications of TLC for the analysis of both synthetic and natural sunscreens. The review contained a detailed description of techniques, materials and instruments of selected applications, including laboratory experiments for students, lipophilicity measurements, TLC-bioactivity detection, TLC-MS, separation and characterization of sunscreens, densitometric analysis of formulations, preparative layer chromatography, thin-layer radiochromatography, TLC of decomposition products and study of blood-barrier permeability. Future prospects were also discussed, including TLC–MS for sunscreen analysis.

J. Planar Chromatogr. 31, 202-206 (2018). HPTLC of vulgarin (1) and epivulgarin (2) in the aerial parts of Artemisia judaica on silica gel with petroleum ether – acetone 7:3. Quantitative determination by absorbance measurement at 224 nm. The hRf values for (1) and (2) were 30 and 36, respectively. Linearity was in the range of 100-700 ng/zone for (1) and (2). The intermediate precision was below 1.5 % (n=6). The LOD and LOQ were 13 and 44 ng/zone for (1) and 14 and 47 ng/zone for (2), respectively. Recovery was between 97.1 and 99.6 % for (1) and 97.6 and 99.0 % for (2).

J. Planar Chromatogr. 31, 243-249 (2018). HPTLC of diazinon (1) and chlorpyrifos (2) in the leave extracts of lavender and rosemary on silica gel with petroleum ether – ethanol – glacial acetic acid 95:5:1 for (1) and 90:10:1 for (2). Quantitative determination by absorbance measurement at 254 nm. The hRf values for (1) and (2) were 54 and 50, respectively. Linearity was in the range of 10-1600 ng/zone for (1) and 40-2000 ng/zone for (2). The intermediate precision was below 2 % (n=3). The LOD and LOQ were 3 and 10 ng/zone for (1) and 12 and 40 ng/zone for (2), respectively. Average recovery was 100.8 % for (1) and 99.9 % for (2).

Rapid Commun. Mass Spectrom. 32, 2113-2121 (2019). HPTLC of dihexadecylphosphatidylethanolamine, dihexadecylphosphatidylglycerol, dihexadecylphosphatidylcholine, monohexadecylphosphatidylethanolamine and tetratetradecenylcardiolipid in the lipidome of P. aeruginosa on silica gel with chloroform – methanol – acetic acid – water 170:45:20:8. Detection by exposure to iodine vapor. Phospholipid identification by mass spectrometry.

Anders. J. Planar Chromatogr. 31, 437-443 (2018). HPTLC of apigenin (1) and luteolin (2) in Hygrophila spinosa on silica gel with toluene – ethyl acetate – formic acid 6:4:1. Quantitative determination by absorbance measurement at 349 nm. The hRF values for (1) and (2) were 64 and 54, respectively. Linearity ranged between 80-560 ng/zone for (1) and 40-280 ng/zone for (2). LOD and LOQ were 6 and 19 ng/zone for (1) and 2 and 7 ng/zone for (2), respectively. The intermediate precision was <3 % (n=3). Recovery was between 99.3 and 100.5 % for (1) and 99.5 and 100.8 % for (2).