J. Liquid Chromatogr. 12, 919-935 (1989). Investigation of chromatographic behavior of some polar organic dyes and dye intermediates on thin layer of various forms of cationic and anionic exchange resins, indicating the great effect of the stationary ion and mobile ion of both types of exchangers on both level of tailing and Rf values of the adsorbed compounds.

A case study of 3-amino-9-ethylcarbazole. Chemical weekly (India) August 23, 129-120 (1994). Process monitoring of the synthesis of 3-amino-9-ethylcarbazole from carbazole-ethylcarbazole-nitrosoethylcarbazole-nitroethylcabazole by HPTLC on silica with heptane - toluene 8:2. Quantification of different fractions during reaction by densitometry at 270 nm. The reaction was monitored and terminated at suitable stage to minimize the formation of other by-products, improving the yield of final dye intermediate.

J. Liq. Chrom. & Rel. Technol. 24, 2849-2860 (2001). TLC of gardenia yellow, crocin, and crocetin on RP-18 with acetonitrile - tetrahydrofuran - 0.1 mol/L oxalic acid 7:8:7. Quantification by densitometry between 370-700 nm; depending on the substance.

J. Planar Chromatogr. 25, 509-515 (2012). HPTLC of textile dyes Lanasyn Blue F-L 150 (1), Lanasyn Dark Brown M-GLN (2), Lanasyn Red M-GA (3), Nylosan Dark Brown S-MBL (4), and Nylosan Red N-2RBL (5) on RP-18 with n-butanol - ethyl acetate - 5 % ammonium hydroxide 4:4:1. Quantitative determination by absorbance measurement at 550 nm. Linearity was in the range of 20-60 ng/band. Limits of detection for (1) to (5) were 7, 6, 3, 5 and 1 ng/band, respectively.

Trends Anal. Chem. 85, 47-56 (2016). Sunset Yellow FCF (E110) is an azo dye and is widely used in the food industry as synthetic food dye. Its determination in food and beverages is important because of the suspected health issues for humans. This review described the application of analytical techniques for the determination of Sunset Yellow FCF, including the use of water-methanol solutions of beta-cyclodextrine as mobile phase and polyamide sorbents as stationary phase to replace organic solvents in TLC systems.

H. TRAITLER, A. STUDER, R.E. KAISER (eds): Instrumental HPTLC, Institute for Chromatography, Bad Dürkheim, FRG (1987), 349- 359. Investigations on the application of chitin as a TLC stationary phase, especially a-chitin. Possibilities of obtaining mechanically and chromatographically stable precoated chitin layers. Application in the separations of amino acids and dyes.

J. Liquid Chromatogr. 12, 235-246 (1989). Comparison of two data analysis methods, overlapping resolution mapping (ORM) and ideal separation (IS), to optimize the multiple-component mobile phase composition for HPTLC. Evaluation of the separation of 11 anthraquinone dyes using the two methods to select the best mixture of three blends for the mobile phase, composing of benzene, chloroform, tetrahydrofuran, and with each blend having a Snyder’s solvent strength of e = 0.3. Discussion of the results from the two methods. Presentation of resolution contour map for both ORM and IS to find regions of optimum mobile phase composition.

J. Planar Chromatogr. 7, 464-468 (1994). TLC on silica with ethanol, methanol, ether and acetonitrile. Quantification by elution, extraction, and photometry. Detection in daylight.