J. Liq. Chromatogr. Relat. Technol. 31, 1959-1968 (2008). Quantitative Ag-TLC of eight samples of sunflower oil with different linoleic acid content on silica gel (impregnated by dipping into a 0.5 % methanolic solution of silver nitrate) with petroleum ether - acetone 25:1, and petroleum ether - acetone - ethyl acetate 100:5:2, and 50:3:2. Detection by consecutive treatment with bromine and sulfurylchloride vapors (30 min each) followed by heating at 180-200 °C. Quantitative determination by absorbance measurement at 450 nm. Evaluation of authenticity and possible adulteration of edible oils.

J. Planar Chromatogr. 21, 355-360 (2008). TLC of flavonoids (myrecetin, rutin, catechin, quercetin, and kaempferol) on silica gel in a horizontal chamber with acetone - chloroform - water 8:2:1. Detection by dipping in natural products reagent followed by dipping in PEG reagent (polyethylene glycol 400 in ethanol). Evaluation under UV 254 and 366 nm.

Phytochem. Anal. 18, 209-212 (2007). Separation of extracts of Solanum diflorum and Setaria parviflora by TLC on silica gel, cellulose, and RP-18 and by HPTLC on cyano and diol phase with hexane - ethyl acetate 1:1 and n-butanol - formic acid - water 5:1:4 (upper phase). Detection after distribution of ß-glucuronidase staining solution (52.5 mg agar and 0.9 mL 0.5 % iron(III) chloride solution). After solidification of the staining solution, the TLC plate was incubated for 120 min at 37 °C and immersed in a 0.2 % solution of esculin. Autography showed enzyme inhibition zones with hRf of 14 (Solanum diflorum) and 46 (Setaria parviflora).

J. Planar Chromatogr. 23, 14-17 (2010). TLC of vitamin C of different concentrations (0.45, 0.50, 0.55, 0.60, and 0.65 mg/mL) and juice (e. g. orange with grapefruit, orange with apple and carrot, “multi-fruit”) mixed with a methanolic solution of DPPH radical (2,2-diphenyl-1-picrylhydrazyl) on silica gel. Images of plates were evaluated using a specific computer software. The equivalence of the results obtained using the procedure described was demonstrated by applying the traditional UV-visible spectrophotometry.

J. Liq. Chromatogr. Relat. Technol. 33, 1013-1027 (2010). Preparative TLC of triacylglyerol (TAG) fractions on silica gel with hexane - acetone 25:4. Analytical TLC of TAG classes from sunflower, corn, soybean, cotton, and olive oil (differing in saturation) on silica gel, impregnated by dipping into a 5 % methanolic solution of silver nitrate, with petroleum ether - acetone - ethyl acetate 100:3:2 and 50:3:2. Detection by exposure to bromine and sulfuryl chloride vapor and heating at 180-200 °C . Quantitative determination by absorbance measurement at 450 nm.

CBS 107, 9-10 (2011). Extraction of pesticides from fruit and vegetable samples by QuEChERs method. TLC of acetamiprid, azoxystrobin, chlorpyriofos, fenarimol, mepanipyrim, penconazole and pirimicarb on amino phase aluminum foil (prewashed with acetonitrile) with acetonitrile over a migration distance of 75 mm in the first direction. After drying development in the backwards direction over 45 mm with acetone. Evaluation under UV 254 nm, UV 366 nm, white light and under UV 366 nm after immersion in primuline solution. Extraction of the target zone by TLC-MS interface with acetonitrile - 10 mM ammonium formate 1:1. Average recoveries of the seven pesticides were 90-104 % with %RSD of 0.3-4.1 % (n = 5). This new high-throughput planar solid phase extraction method for multi-residue analysis of pesticides in food allows a rapid and efficient clean-up at low costs and low solvent consumption.

J. Planar Chromatogr. 24, 281-289 (2011). TLC of tartrazine (E 102), quinoline yellow (E 104), azorubin (E 122), ponceau 4R (E 124), allura red AC (E129), patent blue V (E 131), and brilliant blue FCF (E133) on RP-18 or cyano phase with methanol - acetate or citric buffer containing diethylamine or octane-1-sulfonic acid sodium salt. Quantitative determination by densitometry in the range of 200-800 nm with a diode array scanner. The LOD and LOQ were 33, 54, 93, 119, 87, 31, 59 and 99, 164, 281, 362, 263, 95, 179 ng/zone for E 102, E 104, E 122, E 124, E 129, E 131, and E133, respectively. The correlation coefficients were 0.9970, 0.9963, 0.9895, 0.9965, 0.9930, 0.9975, and 0.9920, respectively. The linearity was given in the range of 2.5-40 and 2.5-70 µg/mL.

CBS 109, 2-4 (2012). Extraction of arabica coffee with 2 to 50 % robusta coffee by accelerated solvent extraction with tBME. A part was saponified with10 % ethanolic KOH solution for 2 h. HPTLC of coffee extracts and standards 16-O-methylcafestol (16-OMC) and 16-OMC esters on silica gel with toluene - ethyl acetate - acetic acid 93:7:1 for 16-OMC esters and with tBME - chloroform 1:1 for 16-OMC. Detection by spraying with vanillin sulfuric acid (1 g in 250 mL ethanol and 2 mL of sulfuric acid, prepared freshly) and heating for 1 min at 80 °C. Quantitative absorption measurement at 530 nm. The LOD was 163 ng/band. After saponification the LOD of free 16-OMC was 43 ng/band. Thus 2 % robusta can be detected in a coffee blend.