J. Liquid Chromatogr. 14, 1461-1467 (1991). TLC of synthetic dyes on antimonic acid and on admixture of antimonic acid and silica with butanol – acetic acid – water 5:1:2. Discussion of the separation potential of the stationary phase.

InCom-Sonderband, 1-6 (1997). Comparison of the capabilities of two chromatographic methods, gas chromatography/mass spectrometry and densitometric thin-layer chromatography, for solving an important problem of forensic analysis, namely, determining the age of writing inks on questioned documents. GC/MS analyzing ink volatile components has certain advantages compared with TLC dealing with ink dye components. Details for densitometric TLC see R. L. Brunelle, Intern. J. of Forensic Document Examiners 1, 94-98 (1995).

Proc. Ros. Acad. Sci. 399 (3), 362-365 (2004). Determination of colorants (rhodamine B, brilliant green and rhodamine G) on silica gel (sorbphil, Sorbpolymer, Russia) with ethanol (amperage 220 µA), ethanol and 0,01 % LiCl (475 µA), acetonitril - water 9:1 (430 µA), acetonitril - water 9:1 and 0,01 % LiCl (830 µA) or silica gel (Merck) with ethanol (amperage 240 µA), ethanol and 0,01 % LiCl (650 µA), acetonitril - water 9:1 (360 µA), acetonitril - water 9:1 and 0,01 % LiCl (950 µA). Frequently used voltage is 1 kV. All the plates are covered with polyethylene film to prevent evaporation of mobile phase.

Phytochem. Anal. 20, 19-23 (2009). TLC of curcumin (1), demethoxycurcumin (2), and bisdemethoxycurcumin (3) from the rhizomes of Curcuma longa on silica gel with hexane – chloroform – methanol 10:10:1 as mobile phase. Quantitative determination by recording the chromatogram using a digital scanner and analyzing the density of the TLC spot with the Scion Image software. The hRf values of (1), (2), and (3) were 42, 25, and 18, respectively. Selectivity regarding matrix was given. Linearity was between 0.375 and 6 µg/spot for all curcuminoids. The intermediate precision of the method was satisfactory. Recovery was 101.9 % for (1), 104.8 % for (2), and 101.5 % for (3). The limits of detection and quantification were 43 and 143 ng/spot for (1), 69 and 230 ng/spot for (2), and 73 and 242 ng/spot for (3). The method was compared with an official densitometric method, and the analytical results were not significantly different.

J. Planar Chromatogr. 27, 274-290 (2014). TLC of saffron in Crocus sativus on silica gel with n-butanol - acetic acid - water 4:1:1. Quantitative determination by image analysis which produced intensity profiles based on red, green and blue characteristics (RGB) and further processing by specially designed software. The method allowed for comparison of different types of saffron (geographical differentiation and discrimination of natural and adulterated samples) using hRf values, color range and intensity of the separated components.

Biochemical Systematics and Ecology 15, 607-610 (1987). TLC of the carotenoid pigments of whole animal, epidermis and hepatopancreas of the crayfish on silica with petrol ether - methanol 95:5 and benzene - ethanol - methanol - 17:2:1. Identification by means of several criteria: Rf-values, chromatographic comparisons, visible absorption spectra of the fractions eluted from TLC plates.

Chromatographia 31, 5-10 (1991). HPTLC of chlorophylls, phaeophytins a and b, ß-carotene, lutein, violaxanthin and neoxanthin on CN-bonded silica with chloroform - hexane - methanol 25:70:5. Determination of calibration curve functions and of the absorbance delay with time. In-situ spectra recording from 370 to 700 nm. Examination of spectra variations with the spotted amounts of pigments and the storage time. Quantification by densitometry at 425 nm with the sensitivity of 0.5 pmol for ß-carotene, 1 pmol for chlorophylls a and b, and 12 pmol for lutein.

Biochemical Systematics and Ecology 22, 835-836 (1994). TLC of malonylated malvidin glycosides, cyamidin-3-glucoside and cyanidin-3-rutinoside on microcrystalline cellulose with butanol - 2N hydrochloric acid 1:1 or acetone - hydrochloric acid - water 15:3:82.