J. Chromatogr. 408, 181-190 (1987). TLC of six chlorophylls and derivatives on RP-18 silica with single solvents including alcohols, acetone, acetonitrile, and binary solvents such as acetone - acetonitrile and ethanol - water. Detection by densitometry at 410 nm and 435 nm. Discussion of the retention behaviours. Also, HPLC.

Biochemical Systematics and Ecology 18, 307-316 (1990). TLC of canthaxanthin, native xanthophylls, peridinin and peridininol on silica – CaCO3 1:1 with petrol ether – acetone – isopropanol 69,5:25:4:1,5, or on silica – Ca(OH)2– MgO – CaSO4 10:4:3:1 with petrol ether – acetone – benzene – isopropanol 69.5:25:2:1.5.

(Hungarian). Acta Pharmaceutica Hungarica 64, 117-122 (1994). TLC of anthocyanins on cellulose with formic acid - hydrochloric acid - water 6:1:5. Densitometry.

J. Agric. Food Chem. 48, 825-828 (2000). TLC of pigments on silica gel with solvent system A (light petroleum ether 40 608C) for the separation of b-carotene and lycopene, system B (petroleum ether (65 - 958C - acetone - diethylamine 10:4:1 for e.g. rubixanthin, gazaniaxanthin, b-cryptoxanthin, zeaxanthin, violaxanthin, antheraxanthin, g-carotene. Detection by observation under white and UV light.

J. Chromatogr. A 1572, 152-161 (2018). Description of a novel application of HPTLC for separation and quantification of eight food colors (amaranth, allura red, erythrosine, fast green, indigo carmine, quinoline yellow, sunset yellow and tartrazine) and four intense sweeteners (acesulfame, aspartame, saccharin and neohesperidin) on silica gel with acetonitrile – water - ethyl acetate - 10 % aqueous ammonia 9:1:1:1. Quantitative determination by densitometry at 210, 295, 450 and 550 nm. The LOD and LOQ ranged from 0.2 to 10 ng/zone and from 1 to 30 ng/zone, respectively. The correlation coefficient (r2) values for the calibration curves were ≥ 0.9973 for all the additives. The recovery of different additives obtained from food products, beverages and pharmaceuticals ranged from 96.6 to 106.7 %.

J. Food Hyg. Soc. of Jap. 34, 512-516 (1993). Description of reverse-phase TLC/FABMS method incorporating an analyte condensation technique for the identification of 12 coal tar dyes, using the magic bullet matrix (a 3:1 dithiothereitol-dithio-erythritol mixture). TLC of xanthene and other dyes on RP-18 with MEK - methanol - 5% aqueous sodium sulfate solution 1:1:1, and 2) methanol - acetonitrile - 5% aqueous sodium detection limit 150-fold with good reproducibility by using the condensation technique.

J. Planar Chromatogr. 20, 381-384 (2007). Study of the retention behavior of 36 synthetic dyes in adsorption and reversed-phase TLC on zeolite layers with n-hexane, tetrahydrofuran, and bidistilled water. Significant linear correlations were found between the retention of the dyes chromatographed with the different mobile phases, proving the regular retention behavior of the analytes. No linear relationship was found between the physicochemical properties of the dyes and their retention, suggesting the separation capacity of zeolite differs markedly from that of silica and silica coated with hydrophobic ligands.

Chem. J. of Chinese Univ. 35 (4), 741-745 (2014). TLC is a rapid, simple, efficient, economic and widely used method with great advantages but some limitations in the detection of unknown groups. IR is a universal detection technique with advantages in the detection of colorless, non fluorescent substances. For successful application of TLC/FTIR the selection of the proper stationary phase is important. In this study sulfur fine particles were successfully employed as the coating for narrow band plates. Sulfur fine particles with the average size of 500 nm were produced by reaction of sodium thiosulfate with hydrochloric acid and characterized by XRS. Narrow band plates were coated by precipitation/evaporation technique. TLC of the mixture of rhodamine B and gentian violet on narrow band plates with tetrahydrofuran – methanol – ammonia 16:2:1 with chamber saturation for 10 min. TLC of the mixture of rhodamine B and bromophenol blue on narrow band plates with ethyl acetate – methanol – ammonia 16:1:3 with chamber saturation for 10 min. Both systems achieve complete separation. In situ detection of the separated zones by microscopic reflection infrared spectroscopy. The resulting spectra of the separated zones of rhodamine B, gentian violet and bromophenol blue matched those of the corresponding standards. There were no interfering absorption peaks except for the absorption peak of CO in the mid infrared region. The layer had a considerable ability for separation of mixed samples, therefore, the new type of stationary phase can meet the requirements for analyzing some mixtures by TLC/FTIR hyphenated technique.