J. Planar Chromatogr. 28, 167-172 (2015). TLC of trans-resveratrol in cosmetic raw materials on RP with methanol - water 3:2. The plate is dried for 3 h. Quantitative determination by fluorescence measurement using a deuterium lamp at 340 nm. The hRF value was 38. The LOD and LOQ were 2 and 6 ng/zone, respectively. The presence of trans-resveratrol in the analyzed samples was additionally confirmed by detection with anisaldehyde reagent.

J. of Chromatogr. Sci. 52 (1), 5-11 (2014). Presentation of a method for the simultaneous determination of diacerein in the presence of rhein, the active metabolite and hydrolytic degradation product of diacerein, and emodin, the diacerein impurity, in bulk powder and different pharmaceutical formulations. TLC on silica gel with hexane – ethyl acetate – acetic acid 75:50:1, detection and quantification by densitometry at 230 nm. The hRf values were 12, 44 and 60 for diacerein, rhein and emodin, respectively. The linearity ranges were 0.5–10 µg/band for diacerein and rhein, and 0.5–7 µg/band for emodin. Comparison with a HPLC method showed no significant differences.

CBS 117, 5-7 (2016). HPTLC of amylase-produced dextrins and standards glucose, maltose, maltotriose, maltotetrose, maltopentose, maltohexose, and maltoheptose on silica gel with acetonitrile – acetone – water 3:3:2 with chamber saturation to a migration distance of 60 mm. Detection by immersion into aniline-diphenylamine-phosphoric acid reagent (2 g diphenylamine and 2 mL aniline in 80 mL methanol in 10 mL 85 % phosphoric acid, made up to 100 mL with methanol) followed by heating at 120 °C for 5 min. Evaluation under white light. Quantitative determination by absorbance measurement at 500 nm. Evaluation in the polynomial working range of 40-210 ng/band.

in different_x000D_ growth stages by thin-layer chromatographic scanning. J. Planar Chromatogr. 31, 190-196 (2018). HPTLC of rupestonic acid (1), vitexicarpin (2), apigenin (3), and luteolin (4) in Artemisia rupestris on silica gel with chloroform – methanol – formic acid – water 650:63:17:7. Quantitative determination by absorbance measurement at 250 nm for (1) and 352 nm for (2) to (4). The hRf values for (1) to (4) were 56, 67, 34 and 18, respectively. Linearity was in the range of 128-725 ng/zone for (1), 70-400 ng/zone for (2), 26-145 ng/zone for (3) and 17-97 ng/zone for (4). The intermediate precision was below 5 % (n=6). Average recoveries for (1) to (4) were 100.0 %, 103.6 %, 98.1 % and 99.9 %.

J. Chromatogr. Sci. 57 (1), 81–86 (2019). HPTLC of of norfloxacin (NF), tinidazole (TZ) and its potential impurity 2-methyl-5-nitroimidazole (MNZ) on silica gel with chloroform – methanol - formic acid 75:10:3. Detection and quantitative determination by densitometry at 298 nm. The linearity was between 0.4–2.4, 0.4–1.6, and 0.2–1.2 μg/band for NF, TZ and MNZ, respectively.

II. Problems in the choice of the solvent system. Proc. Intern. Symposium on TLC with special Emphasis on OPLC, Szeged, 94-95 (1984). OPLC (OPTLC) of beta-amino-isobutyric acid on silica with chloroform - butanol- DMF - acetic acid 91:2:2:1. Detection with ninhydrin reagent. Densitometry. Separation of urine constituents for the purpose of determining beta-amino-isobutyric acid (a possible tumor maker).

Proc. Intern. Symposium on TLC with special Emphasis on OPLC, Szeged, 76 (1984). OPLC (OPTLC) of phenbendazole on silica with a) ethyl acetate, b) MEK - propanol - water - chloroform 52:5:3:45. Detection by UV 254 nm. Fluorescence scanning. Detection limit 30 ng/spot.

Americ. Lab. 17, (3) 131-133 (1985). TLC of aspartame on silica with butanol - acetic acid - water 6:2:2. Detection by spraying with 0.2 % ninhydrin in acetone. Quantification by densitometry. Visual detection limit 50 ng and lower; limit of determination150 ng (instrument dependent.). Comparison with other methods.