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.

J. Planar Chromatogr. 26, 73-77 (2013). TLC of guaifenesin (1), pseudoephedrine hydrochloride (2) and guaiacol (3) on silica gel with hexane - ethyl acetate - acetone - water - triethylamine 30:30:40:3:1. Quantitative determination by absorbance measurement at 208 nm for (1) and (2) and 278 nm for (3). The hRf values for (1) to (3) were 34, 12 and 83, respectively. Linearity was in the range of 2-12 µg/zone for (1), 14-25 µg/zone for (2) and 0.1-1.1 µg/zone for (3). LOD and LOQ were established for (3) only: LOD was 40 ng/zone and LOQ 100 ng/zone. Recovery (by standard addition) was between 99.9 and 100.0 %. Intermediate/interday/intra-day precision was below 2 % (n=3).

J. Planar Chromatogr. 26, 279-283 (2013). HPTLC of oleandrin in the stems of Nerium oleander on silica gel with n-hexane - ethyl acetate 2:3. Quantitative determination by absorbance measurement at 275 nm. The hRf of oleandrin was 24. Linearity was in the range of 2-75 ng/zone. LOD and LOQ were 2.2 and 6.7 ng/zone, respectively. Relative recoveries in serum and urine were 83 and 89 %, respectively. Intermediate/interday/intra-day precision was below 9 %.

J. Planar Chromatogr. 26, 43-55 (2013). TLC of cefditoren pivoxil on silica gel with 1-butanol - acetic acid - water 17:2:1. Quantitative determination by absorbance measurement at 295 nm. The hRf of cefditoren pivoxil was 70. Linearity was in the range of 600-1600 ng/zone. The LOD and LOQ were 40 and 130 ng/zone, respectively. Recovery (by standard addition) was between 97.8 and 101.8 %. Intermediate/interday/intra-day precision was below 2 % (n=3). The method showed comparable results with a validated HPLC method.

J. Planar Chromatogr. 26, 226-231 (2013). HPTLC of lamivudine (1), tenofovir disoproxil fumarate (2), and efavirenz (3) in tablets on silica gel with toluene - methanol 27:6. Quantitative determination by absorbance measurement at 254 nm. The hRf values for compounds (1) to (3) were 12, 16 and 53, respectively. Linearity was in the range of 375-900 ng/zone for (1) and (2) and 750-1800 ng/zone for (3). LOD and LOQ for (3) were 1 and 3 ng/zone. Recovery was in the range of 98.3-102.9 % for (1) to (3). Intermediate/interday/intra-day precision was below 2 % (n=6).

J. Liq. Chromatogr. Relat. Technol. 37, 2814-2828 (2014). HPTLC of arylureas and arylacetamides derivatives on RP-18 with 1-13 % water in dimethylsulfoxide (increment 3 %). Detection under UV 254 nm. A quantitative structure-retention relationship study allowed to investigate the retention behavior of these substances as well as determination of lipophilicity related to the biological activity towards dopamine D2 and 5-hydroxy-tryptamine receptors.

J. Planar Chromatogr. 27, 245-250 (2014). HPTLC of fructooligosaccharides DP3-DP9 in Morinda officinalis on silica gel with n-butanol - isopropanol - water - acetic acid 7:5:2:1. Detection by spraying with 1-naphthol–sulfuric acid reagent, followed by heating at 110 ºC for 3 min. Quantitative determination by absorbance measurement at 585 nm. The hRF values for DP3 to DP9 were between 20 and 70. Linearity was in the range of 150-1050 ng/zone for DP3, 137-962 ng/zone for DP4 and DP5, 131-919 ng/zone for DP6 and DP9, 144-862 ng/zone for DP7 and 156-1094 ng/zone for DP8. The intermediate/interday/intra-day precisions were below 5 % (n=6). Average recoveries for DP3 to DP9 were between 91.4 and 99.0 %.

CBS 111, 5-6 (2013). HPTLC of caffeine, taurine, and arginine in shampoo samples extracted with isopropanol, on silica gel over 50 mm with isopropanol - n-heptane - water 7:3:1 for caffeine and isopropanol - water 4:1 for arginine and taurine. Detection under UV 254 nm (caffeine) and after spraying with ninhydrin reagent under white light (arginine and taurine). Quantitative absorbance measurement at UV 254 nm for caffeine and UV 600 nm for arginine and taurine. The hRF of caffeine was 54. Precision (%RSD) for the polynomial calibration of caffeine was 3.9 % (n=3). The hRf of taurine was 24. Arginine remained at the start position under these conditions. The content of taurine and caffeine found in shampoos corresponded to the usual amount of 0.1 % active ingredient in a formulation.