Biochemical Systematics and Ecology 18, 303-306 (1990). TLC of 19'-hexanoyloxyfucoxanthin, fucoxanthin, diadinoxanthin, 19-hexanoyloxyparacentrone-3-acetate, diatoxanthin and ß,ß-carotene on silica with 40% acetone in hexane, hexane – acetone – isopropanol 68,5:40:1,5 or hexane – acetone – isopropanol – benzene 17:33:1,3:17.

Biochemical Systematics and Ecology 22, 31-41, (1994). Separation of carotenoids on silica with acetone - hexane in different proportions. Preparative TLC on silica with the same hexane - acetone mixtures.

J. Agric. Food Chem. 48, 22-26 (2000). TLC of e.g. pelargonidin 3-O-, 3-O-malyl, and 3,5-di-O-glucoside on cellulose with hydrochloric acid - acetic acid - water 3:15:82 and 1-butanol - acetic acid - water 4:1:5, upper phase. Visualization under UV 365 nm.

Acta Chrom. 12, 151-158 (2002). HPTLC of lutein in nutrition supplements on RP-18 (with concentration zone, pre-washed with dichloromethane – methanol 1:1) with petroleum ether – acetonitrile – methanol 1:2:2. All sample solutions and developing chambers were wrapped in aluminum foil to protect the labile pigment from photo-decomposition. Densitometry at 448 nm. Three products containing lutein as the free alcohol or dipalmitate ester plus other ingredients were analyzed.

J. Chromatogr. A 1390, 103-111 (2015). HPTLC-Vis-ESI-MS of 6 dyes in a commercially available dye mixture on silica gel with toluene up to a migration distance of 60 mm. Detection under white light and absorbance measurement using a multi-wavelength scan at 450, 500, 530 and 620 nm. Via the TLC-MS Interface the dye zones were eluted with methanol - ammonia formiate buffer (10 mM, pH 4.8) 19:1 at a flow rate of 0.1 mL/min into a single quadrupole mass spectrometer. Electrospray ionization mass spectra were recorded in full scan mode. Characteristic m/z values of dyes were used for quantitative measurements in SIM mode. The mean precisions (n=5) were below 10 % and a mean correlation was of 0.9975 for the 6 dyes. HPTLC-MS analysis revealed the incorrect assigment of components in two commercially available dye mixtures. Photooxidation degradation products were observed for interrupted workflows (for elutions after several days when the plate was kept in daylight).

Normal and reverse-phase TLC of coal tar dyes in 162 food samples. Investigation of the applicability of reverse-phase TLC to the analysis. Comparison of the chromatographic behavior of the dyes. The results indicate that the use of reverse-phase TLC makes it easier to identify dyes in food.

J. Liq. Chromatogr. Relat. Technol. 28, 325-334 (2005). TLC of carthamus yellow in 35 commercial foods, on RP-18 with 2-butanone - methanol - 5 % sodium sulfate - 5 % acetic acid 3:2:5:5 without chamber saturation. Measurement of visible absorption spectrum using scanning densitometry.

J. Liq. Chromatogr. Relat. Technol. 36, 2476-2488 (2013). HPTLC of synthetic colorants tartrazine (1), quinoline yellow (2), sunset yellow FCF (3), azorubine (4), amaranth (5), ponceau 4R (6), allura Red AC (7), patent blue V (8), indigo carmine (9), and brilliant blue FCF (10) on RP-18 with 0.5 M ammonium sulfate in 30 % of ethanol - water solution. Quantitative determination by absorbance measurement at 450, 500 and 625 nm. The hRf values were in the range of 17 and 64. Linearity was in the range of 20-180 ng/zone for (1) to (8) and 35-300 ng/zone for (9) and (10). LOD and LOQ were 2 and 3 ng/zone, respectively. Recovery (by standard addition) was in the range of 81-108 %. Intermediate intra- and inter-day precision was below 5 % (n=3).