Rapid Commun. Mass Spectrom. 31, 983-990 (2017). HPTLC of Pilot FriXon erasable ball pen ink on silica gel with methanol containing 1 % acetic acid. Detection by desorption electrospray ionization (DESI) coupled with an LTQ mass spectrometer. The hRF values of ink components in the ink mixture were 20, 30, 37, 50, 65 and 78.

J. Chromatogr. 454, 352-356 (1988). TLC of azo dyes on acetylated paper with C1-C4 alcohols in mixtures with water or NH3. Investigation of the dual retention mechanism of commercial acetylcellulose arising from its incomplete acetylation and depending on the hydrophilicity or lipophilicity of the analytes, as well as on the organic modifier in the mobile phase.

J. Planar Chromatogr. 6, 138-143 (1993). HPTLC of 10 sulfonated dyes for use in pharmaceutical formulations and in foodstuffs on RP-18 silica with methanol - water 8:2 or a 20 mM solution of tetrabutylammonium bromide in methanol - water 8:2. In certain cases predevelopment over 8 cm with 20 mMol solution of tetrabutylammonium bromide in methanol.

J. Planar Chromatogr. 10, 10-17 (1997). Use of surface-enhanced resonance Raman (SERR) spectroscopy for selective detection of structurally similar aminotriphenylmethane dyes separated by TLC. In situ SERR spectra were recorded with a multichannel micro-Raman spectrometer after the application of colloidal silver solution to the analyte spots. Good-quality SERR spectra recorded for dyes separated by TLC enabled the mutual discrimination of the dyes. The limits of identification of the TLC -SERRS method (ca 5 ng applied) were sufficient for acquisition of spectra of impurities present in the (certified) dye standards. TLC on silica with 1-butanol - acetic acid - water 10:1:2 for the separation of crystal and ethyl violet and the same eluent 10:2:4 for the separation of malachite and brilliant green. Quantification by densitometry.

J. Planar Chromatogr. 19, 98-103 (2006). TLC of 11 azo-dye derivatives on RP18 with water - methanol, water - acetone, water - dioxane, and water acetonitrile mobile phases. Detectionunder UV light at 254 nm. Investigation of the retention mechanism and determination of the retention constants.

J. AOAC Int. 91, 1162-1167 (2008). HPTLC of curcumin, demethoxycurcumin, and bisdemethoxycurcumin as standards on silica gel prewashed with methanol using chloroform - methanol 97:3 in a twin-trough chamber at 23 °C and 31 % relative humidity. Quantitative determination by absorbance measurement at 430 nm.

J. Planar Chromatogr. 29, 480-483 (2016). 2D-TLC of pheophytins in green leaves on silica gel with hexane ‒ acetone ‒ ethanol 35:14:1. An analogous transverse elution was undertaken after 5 min and 1, 3, 7, and 9 days. The paper suggests that the green colored spots on the silica gel layer with fluorescence indicator are due to the incorporation of Zn2+ in the compounds.

Advances in Liquid Chromatography, Sept. 3-6 (1988), Szeged, Hungary). TLC on silica with ethyl acetate - formic acid - water 12:1:1, 2-propanol - n-hexane - formic acid - water 100:78:11:11, ethyl acetate - water - acetic acid - formic acid 100:27:11:11, ethyl acetate - water - acetic acid 100:30:20. Detection by spraying with 1% vanillin-phosphorous acid or 3% Fe-(III)-chloride or 5% phosphormolibdenic acid or Folin-Ciocolteau reagent. Quantification by densitometry at 515 nm.