J. Chromatogr. A 1533, 199-207 (2018). Presentation of a simple and cost-effective approach for the determination of selenium species in algae and yeast biomass by TLC combined with diode laser thermal vaporization inductively coupled plasma mass spectrometry (DLTV ICP MS), after extraction of freeze-dried biomass in 4M methanesulphonic acid and vaporization of the selenium species from cellulose plates using a continuous-wave infrared diode laser with power up to 4W. Quantification of selenomethionine and selenocysteine with LOD of 3 μg/L in a Se-enriched microalgae Chlorella vulgaris and yeast certified reference material SELM-1. Comparison of the results delivered by TLC-DLTV ICP MS with those obtained by a routine coupling of HPLC to ICP MS showed that both were consistent, moreover, the TLC approach has advantage in capability of analyzing extract containing even undiluted crude hydrolysates.

J. Liq. Chromatogr. Relat. Technol. 41, 364-372 (2018). TLC-DPPH test of gluten-free sheeted pasta supplemented with pomegranate seeds powder (PSP) on silica gel with ethyl acetate – water – acetic acid 8:1:1. Plates were immersed for 5 s in a freshly prepared 0.1 % methanolic DPPH solution and scanned every 10 min over an hour. The total areas under the peaks per track were measured and compared with the area obtained for rutin. Antioxidant properties of gluten free pasta correlated with the PSP content.

J. Chromatogr. A 1569, 212-221 (2018). Presentation of a method for simultaneous determination of mono-, di-, oligo- and polysaccharides in food by HPTLC on silica gel with acetonitrile – water 4:1 containing 3.6 mM natural products reagent A in a single development. Use of the method for both, effective food screening and quantification for up to 20 samples in parallel on the same plate with good reproducibility of the separation at control of the layer activity, and with the determination coefficients of the calibration curves between 0.9980 and 0.9998. Test of the method with 4 different prebiotic food and 60 naturally degraded inulin samples proved its advantages of minimal sample preparation along with the determination of the intact inulin and FOS allowed the evaluation of the natural inulin degradation profile, as shown for naturally degraded inulin samples, and the method is robust and suitable for routine analysis, especially in food control, as well as might be of interest in other fields, e.g. plant breeding, edible insects, functional feed and metabolic processes.

J. AOAC Int. 101, 1397-1401 (2018). HPTLC of sudan red dyes, namely Sudan orange G (1), Sudan red G (2), Sudan I (3), Sudan II (4), Sudan III (5) and Sudan IV (6) in spices and spice mixtures on RP-18 acetonitrile – methanol – aqueous ammonia solution (25 %) 40:9:1. Quantitative determination using a flatbed scanner with a 16-bit resolution. The hRF values for (1) to (6) were 54, 48, 57, 35, 26 and 17, respectively. Linearity was between 20 and 500 ng/zone for (1) to (6). LOD and LOQ were 17 and 35 ng/zone for (1), 11 and 21 ng/zone for (2), 14 and 31 ng/zone for (3), 12 and 24 ng/zone for (4), 18 and 42 ng/zone for (5) and 16 and 37 ng/zone for (6), respectively.

J. High Resol. Chromatogr. 7, 473-476 (1984). HPTLC of phospholipids on silica with chloroform - acetone - methanol - acetic acid - water 3:4:1:1:0.6. Detection by dipping into MnCl2-reagent and heating at 120 °C for 20 minutes, after cooling down dipping into paraffin-hexane 1:2 and drying. In situ fluorometry.

Proc. Intern. Symposium on TLC with special Emphasis on OPLC, Szeged, 24-25 (1984). HPTLC of papaverine hydrochloride on silica with diisopropyl ether - isooctane 1:1, diisopropyl ether - methanol 1:1. Quantification by fluorescence scanning (263 nm excitation).

Proc. Intern. Symposium on TLC with special Emphasis on OPLC, Szeged, 8 (1984). HPTLC of trigonelline on silica with propanol - methanol - 0.1 M CH3COONa in water 20:3:30. Detection with Dragendorff reagent and by UV. Fluorometry with excitation at 270 nm or, after Dragendorff staining, by absorbance at 525 nm.

J. High Resol. Chromatogr. 8, 44-45 (1985). TLC of glycyrrhetinic acid on 3-aminopropyltriethoxysilane-treated silica with butanol - NH3 - ethanol 5:2:1. Densitometry at 254 nm. Detection limit 50 ng.