CBS 118, 5-7 (2017). Presentation of two HPTLC methods for 1) detection and identification of UV filter substances in suncream and 2) detection of phenolic markers in Edelweiss species (Leontopodium spp.). For 1) HPTLC of sun cream samples and standards octocrylene, avobenzone, octisalate and ensulizole on silica gel first with heptane – ethyl acetate 4:1 with chamber saturation, migration distance 70 mm, then with isopropanol, without saturation, migration distance 28 mm. Densitometric evaluation by absorbance measurement at UV 254 nm. Direct elution of target zones into a single quadrupole MS, detection in positive and negative ionization mode. For 2) HPTLC of methanolic and glycerol-based Edelweiss extracts and standards chlorogenic acid, apigenin, luteolin, luteolin-4-O-glucoside, luteoline-7-O-glucoside, leontopodic acids A and B, cynarine, and 3,5-dicaffeoylquinic acid on silica gel with butyl acetate – formic acid – water 280:100:3 with chamber saturation, migration distance 70 mm. Detection by heating the plate at 100 °C for 3 min and immersing (while still hot) into natural products reagent (1 g of 2-aminoethyl diphenylborinate in 200 mL ethyl acetate). Evaluation under UV 366 nm.

J. Planar Chromatogr. 9, 146-148 (1996). HPTLC of methyl-, ethyl-, propyl-, and butylparaben on RP-18 with acetone - water without prior chamber saturation; detection under UV 254 nm. Quantification by densitometry at 254 nm (absorbance).

J. Planar Chromatogr. 20, 347-351 (2007). TLC of DTAB on soil, silica gel, alumina, and kieselguhr with fifteen mobile phases, such as aqueous solutions of ammonium sulfate and urea, with chamber saturation for 10 min. Detection by spraying with modified Dragendorff reagent. Among the systems studied the best system for selective separation of DTAB from multicomponent mixtures of other surfactants was kieselguhr - 0.1 M ammonium sulfate. Semi-quantitative determination by spot-area measurement.

J. Planar Chromatogr. 26, 119-124 (2013). HPTLC of methyl- (1), ethyl- (2), propyl- (3), and butylparaben (4) in cosmetics on cyanopropyl plates with water - acetonitrile - dioxane - ethanol 8:2:1:1+1 drop ammonia. Quantitative determination by absorbance measurement at 255 nm and by bioutographic analysis using Vibrio fischeri bacteria. LOD for (3) and (4) was 100 ng/zone, for (1) 80 ng/zone, and 69 ng/zone for (2). The LOQ for (3) and (4) was 120 ng/zone, for (1) 90 ng/zone, and 78 ng/zone for (2).

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. 11, 94-99 (1998). Optimization of the mobile phase composition in HPTLC for rapid and economic determination of synthetic red pigments in cosmetics and medicines by use of the prisma systems and the super modified simplex (SMS) method. - HPTLC of six red pigments, C. I. 15850 pigment Red57, C. I. 15585 Red53 (Na), C. I. 15630 pigment Red49 (Na), C. I.15800 pigment Red64, C. I. 15880 pigment Red63 (Ca), and C. I. 15865 pigment Red48 on silica. Elution A) with butanol - formic acid 100:1; B) ethyl acetate, and C) tetrahydrofuran - water 9: 1. Optimum for prisma method A - B - C 50: 50: 99 and for SMS method A - B - C 50:72:103. Densitometry at 500 nm.

Pharmazie 62, 803-812 (2007). TLC of anthocyanins in aronia, blueberry and lingonberry extracts and the respective preparations (e.g. capsules, lozenges, granulate) on silica gel with ethyl acetate - water - anhydrous formic acid 10:3:2 and 10:4:1. Detection in white light prior and after spraying with iron(III)chloride solution or with vanillin phosphoric acid reagent.

CBS 107, 5-7 (2011). HPTLC of coenzyme Q10 in toluene extracts of soft gel capsules on silica gel (pre-washed by development from both sides with methanol) with toluene in the horizontal developing chamber from both sides. Detection under UV 254 nm. The hRf value of coenzyme Q10 is 20. Quantitative absorption measurement at 282 nm, evaluation via peak height. Linearity was in the range of 20-50 ng/band. Polynomial calibration ranged 20-150 ng/band. The parallel analysis of 60 samples (10 samples each from 6 batches) and 12 standards required only 86 min. The test for content uniformity was performed with 10 samples according to the European Pharmacopoeia and the USP 34 and the requirements were met.