J. Chromatogr. A 1560, 78-81 (2018). The minimalistic software quanTLC is open-source, online, intuitive to use and tailored to planar chromatography. It supports common image file formats for chromatogram upload and allows the quantitative evaluation of samples quickly, involving steps of videodensitogram extraction, preprocessing, automatic peak integration, calibration, statistical data analysis, reporting and data export. The default options for each step are suitable for most analyses, but can be tuned for export of the data in each step and for further processing in other software. Demonstration of the software capabilities on the example of a lipophilic dye mixture separation in a one-minute video user manual. Verification of the quantitative results by comparison with those obtained by commercial videodensitometry software and opto-mechanical slit-scanning densitometry. The software is directly accessible and online useable without installation.

Org. Mass Spectrom. 24, 74-75 (1989). Reversed phase TLC of dyes on silica impregnated with 10% liquid paraffin in petrol ether: triphenylmethane dyes with methanol - MEK - 10% aqueous sodium sulfate 2:2:7, xanthene dyes with methanol - acetonitrile - 10% aqueous sodium sulfate 3:3:10. Detection by secondary mass spectrometry using a condensation technique.

J. Planar Chromatogr. 7, 18-21 (1994). HPTLC of erythrosine on silica with ethyl acetate - methanol - NH3 25% 5:2:1. Densitometry by absorbance at 530 nm.

J. Planar Chromatogr. 12, 129 - 134 (1999). TLC of fluorescein acid, sodium salt, the dichloro-, dibromo-, diiodo-, tetrabromo-, and tetraiodo-derivatives of fluorescein on silica gel and C3 RP silica gel with micellar solutions of cationic, anionic and nonionic surfactants as mobile phases. The use of cationic and anionic surfactants has been found to result in dynamic modification of the silica gel surface which acquires reversed-phase properties.

J. Planar Chromatogr. 23, 94-103 (2010). This review describes available data on analysis of carotenoids by TLC. Petroleum ether, acetone, and hexane are the major mobile phases used for TLC. This technique was found to have the potential to be the first choice for analysis of carotenoids in biological samples. The uses of other, orthogonal chromatographic methods, for example HPLC, MS, scanning densitometry, and image analysis with TLC can enable precise analysis of carotenoids. The review consists of the following parts: 1. Introduction; 1.1 Function of carotenoids; 1.2 Occurrence of carotenoids; 2. Analysis of carotenoids; 2.1 Sampling; 2.2 Sample preparation; 2.3 Extraction of carotenoids; 2.4 Saponification; 2.5 Chromatographic analysis; 3. Thin-layer chromatographic analysis of carotenoids; 3.1 TLC of carotenoids from microbial and animal sources; 3.2 TLC of carotenoids from plant sources; 3.3 Normal-phase TLC analysis of carotenoids; 3.4 Reversed-phase TLC analysis of carotenoids; 3.5 TLC analysis of carotenoids with scanning densitometry; 4. Advantages of TLC in carotenoid analysis; 5. Conclusion and future studies. 134 References.

J. Liq. Chromatogr. Relat. Technol. 41, 83-86 (2018). TLC of gardenia blue in foods on RP-18 with 0.2 % trifluoroacetic acid – acetonitrile – ethanol 1:2:3 and on cellulose with acetone – 3-methyl-1-butanol – water 6:5:5. The hRf values of gardenia blue coloring were 35, 18 and 13 on RP-18 and 72, 56 and 48 on cellulose layer.

Biochemical Systematics and Ecology 16, 445-452 (1988). TLC of carotenes and xanthophylls on silica, silica - calcium carbonate 2:1 and silica - kieselguhr - calcium hydroxide - magnesium oxide 14:16:9:9 with 1, 1, 1-trichlorethane - methanol 23:2, hexan - dimethylketone - isopropanol 141:56:3, hexane - isobutylmethylketone 25:1 and hexane - dimethylketone - isopropanol 137:60:3.

J. Planar Chromatogr. 5, 200-204 (1992). TLC of red bell pepper extract and ß-carotene on silica with ethyl acetate - dichloromethane - hexane 24:56:20 (single development); and a variety of solvent combinations (multiple development); scanning at 450 nm (absorbance). The results show a general instability of carotenoids under conditions typically employed in TLC. Rigorous exclusion of oxygen and light would prevent the alteration of carotenoids, however, not particularly easy to achieve in practice. The use of layers impregnated with antioxidant is one possible solution. Great caution should be exercised when reviewing data TLC for the identification and quantification of carotenoids from plant material.