J. Planar Chromatogr. 26, 78-85 (2013). HPTLC of lamivudine (1), tenofovir disoproxil fumarate (2) and efavirenz (3) on silica gel with chloroform - methanol - toluene 30:4:1. Quantitative determination by absorbance measurement at 260 nm. The hRf values of (1), (2) and (3) were 20, 61 and 73, respectively. Linearity was in the range of 400-800 ng/zone for (1) and (2) and 800-1600 ng/zone for (3). Intermediate precision was below 2 %. LOD and LOQ were 180 and 300 ng/zone for (1), 150 and 210 ng/zone for (2) and 300 and 400 ng/zone for (3), respectively.

J. Liq. Chromatogr. Relat. Technol. 36, 2387-2394 (2014). The image processing programs ImageJ and Sorbfil TLC Videodensitometer were compared to study direct antioxidant properties of compounds separated from extracts obtained from Medicago sativa. Comparable results were obtained based on built-in functions present in both programs for processing TLC videoscans.

Trends in Chromatography 8, 1-6 (2013). HPTLC of neutral lipids and a neutral lipid standard (consisting of 20 % each of cholesterol, oleic acid, triolein, methyl oleate, and cholesteryl oleate) on silica gel (HLF plates with 19 scored channels of 9 mm width) prewashed with dichloromethane - methanol 1:1 and heated for 30 min at 120 °C, with petroleum ether - diethyl ether - glacial acetic acid 80:20:1 with chamber saturation. Detection by spraying with 5 % ethanolic phosphomolybdic acid reagent and heating at 120 °C for 5 min. Neutral lipids appeared as blue zones on a yellow background. The fractions of free sterols, free fatty acids, triacylglycerols, methyl esters, and steryl esters were identified by comparison with the standard mixture. Quantification by absorption measurement at 610 nm via linear calibration (peak area).

J. Planar Chromatogr. 26, 260-266 (2013). HPTLC of of iridoids 10-O-trans-p-coumaroylcatalpol (1), 4-hydroxy-E-globularinin (2) and premnosidic acid (3) in the stem bark of Premna integrifolia on silica gel with ethyl acetate - methanol - water - acetic acid 40:6:3:1. Detection by dipping into vanillin - sulphuric acid reagent (1 % vanillin in ethanol - sulfuric acid 19:1), followed by heating at 110 ºC for 3 min. Quantification by absorbance measurement at 510 nm. The hRf values for (1) to (3) were 52, 41 and 33, respectively. Linearity was in the range of 1-10 µg/zone for (1) to (3). LOD and LOQ were 198 and 663 ng/zone for (1), 312 and 1040 ng/zone for (2) and 200 and 666 ng/zone for (3), respectively. Average recoveries for (1) to (3) were found to be 97.3 %, 98.3 % and 97.6 %, respectively. Intermediate/interday/intra-day precision was below 2 % (n=9).

J. Liq. Chromatogr. Relat. Technol. 36, 2476-2488 (2013). HPTLC of synthetic colorants tartrazine (1), quinoline yellow (2), sunset yellow FCF (3), azorubine (4), amaranth (5), ponceau 4R (6), allura Red AC (7), patent blue V (8), indigo carmine (9), and brilliant blue FCF (10) on RP-18 with 0.5 M ammonium sulfate in 30 % of ethanol - water solution. Quantitative determination by absorbance measurement at 450, 500 and 625 nm. The hRf values were in the range of 17 and 64. Linearity was in the range of 20-180 ng/zone for (1) to (8) and 35-300 ng/zone for (9) and (10). LOD and LOQ were 2 and 3 ng/zone, respectively. Recovery (by standard addition) was in the range of 81-108 %. Intermediate intra- and inter-day precision was below 5 % (n=3).

J. Planar Chromatogr. 26, 445-451 (2013). HPTLC of telmisartan (1) and atorvastatin (2) on silica gel with methanol - chloroform 1:7. Quantitative determination by absorbance measurement at 280 nm. The hRf values for (1) and (2) were 64 and 27, respectively. Linearity was between 1.2-7.2 µg/zone for (1) and 0.4-2.4 µg/zone for (2). LOD and LOQ were 3 and 8 ng/zone. Recoveries (by standard addition) were 98-101 % for (1) and 99-101 % for (2). Intermediate intra- and inter-day precision was below 2 %. Comparable results were obtained with HPLC and UV methods.

J. Planar Chromatogr. 27, 69-71 (2014). HPTLC of bergenin (1) and gallic acid (2) in the rhizome of three Bergenia species, B. ciliata, B. stracheyi, and B. ligulata on silica gel with toluene - ethyl acetate - formic acid 7:11:2. Quantitative determination by absorbance measurement at 314 nm. The hRF values for (1) and (2) were 25 ad 59, respectively.

Food Addit. Contam. 31, 15-20 (2014). HPTLC of sibutramine in food supplements and soluble beverages on silica gel with toluene - methanol 9:1. Quantitative determination by absorbance measurement at 225 nm. The hRF value for sibutramine was 53. Linearity was in the range of 78-3020 ng/zone. The method was sensitive to detect 0.3 mg of sibutramine per capsule of food supplement and showed comparable results with those obtained with HPTLC-UV and HPLC-MS.