J. AOAC Int. 102, 1014-1020 (2019). HPTLC of asiaticoside in Centella asiatica on silica gel with toluene - ethyl acetate - methanol - glacial acetic acid 2:7:3:1. Detection by spraying with anisaldehyde sulfuric acid reagent. Quantitative determination by absorbance measurement at 595 nm. The hRF values for asiaticoside were between 43 and 47 in the standard, plant powder and marketed formulations. Linearity was between 200 and 1800 ng/zone. Intermediate precisions were below 2 % (n=6). The LOD and LOQ were 51 and 155 ng/zone. Recovery rate was between 97.7 and 105.5 %.

J. of Modern Trad. Chinese Med. 20 (8), 975-978 (2018). Panax notoginseng is a traditional Chinese medicinal herb which activates blood circulation, anti-platelet aggregation and anti-thrombosis. TLC for quality control of ginsenoside Rb1 (1), notoginsenoside R1 (2) and ginsenoside Rg1 (3) on silica gel with the lower phase of chloroform – methanol – water 13:7:2 (after standing for 12 h at below 10˚C). Detection by spraying with 10% sulfuric acid in ethanol and heating at 110 ˚C until the zones are visible, evaluation under UV 365 nm. Quantification by densitometric absorption measurement at 510 nm. Validation by investigation of the linearity ranges of 0.5-5.0 µg/zone (r=0.998) for (1), 0.5-5.01 µg/zone (r=0.999) for (2) and 0.5-4.9 µg/zone (r=0.998) for (3). The plate-to-plate precision % RSD (n=12) was 1.5 %, 1.1 % and 1.9 % for (1) to (3). Recovery from standard sample addition was 96.4 % (%RSD 1.4 %, n=6) for (1), 96.9 % (%RSD 0.9 %, n=6) for (2), and 98.9% (%RSD 1.7 %, n=6) for (3).

J. of Chromatogr. A 1534, 170-178 (2018). HPTLC of flavonoid aglycones in eleven commercial Cistus incanus herbal teas using three independent methods (multi-development on amino phase and two two-dimensional developments on silica gel phase). HPTLC on silica gel with chloroform - methanol - ethyl acetate 15:3:2. Detection at UV 254 and 366 nm and by derivatization with aluminium chloride (1 % methanolic solution), ferric chloride (0.5 g FeCl₃ in 2.5 mL water and 47.5 mL ethanol), NP-PEG (0.5 % methanolic NP solution, and after drying, 5 % ethanolic PEG solution), PABA (0.5 g PABA in 18 mL glacial acetic acid diluted with 20 mL water, plus 1 mL o-phosphoric acid and 60 mL acetone), or DPA reagents (1 g aniline and 1 g diphenylamine in 100 mL acetone and 10 mL o-phosphoric acid, heated for 5 min at 110°C). Confirmation of the presence of glucose by HPTLC on amino phase with in situ acid hydrolysis: incubation in HCl vapor followed by heating at 100°C, pre-development with acetonitrile, drying, development with acetonitrile - water 7:3, heating for 20 min at 170°C and dipping in paraffin - n-hexane 1:2 follwed by drying. TLC-direct bioautography by immersion of the developed and dried plates in a bacterial cell suspension of either Bacillus subtilis or Aliivirio fischeri strains. Analysis of the compounds isolated from the bioactive zones by HPLC-diode array detector (DAD)-electrospray ionization (ESI)-MS. The presented TLC/HPTLC platform allowed identification of the antibacterial components apigenin, kaempferide, cis- and trans-tiliroside, and the isomers of the p-coumaric acid-conjugated tiliroside,  all of them inhibiting both B. subtilis and A. fischeri.

Int. J. Morphol. 37, 1164-1171 (2019). HPTLC of transresveratrol in traditional fermented soybean seed coat on silica gel with chloroform - ethyl acetate - formic acid 25:10:1. Qualitative identification under UV light at 254 and 366 nm. The hRF value for transresveratrol was 64.

Trends Anal. Chem. 113, 54-73 (2019). Review of analytical methods for determination of lipophilicity, including a comparison of their usefulness, main advantages and limitations. TLC-based methods were also described, including RP-TLC for the analysis of compounds with low water solubility.

Food Chem. 288, 1-7 (2019). HPTLC of sesamin (1) and sesamolin (2) in sesame seed extracts on silica gel with n-pentane - diethyl ether 3:2. Quantitative determination by absorbance measurement at 290 nm. Linearity was between 25 and 150 µg/mL for (1) and 12.5 and 75 µg/mL for (2). Intermediate precision was below 3 % (n=6). The LOD and LOQ were 1.3 and 4 µg/mL for (1) and 0.4 and 1 µg/mL for (2), respectively. Recovery rate was  between 95 and 105 % for (1) and (2). Correlation of the HPTLC and a HPLC-PDA method was notably high. 

J. Planar Chromatogr. 32, 411-420 (2019). HPTLC of torsemide (1) and eplerenone (2) on silica gel aluminum foil with toluene - ethyl acetate - glacial acetic acid 70:30:1. Quantitative determination by absorbance measurement at 297 nm. The hRF values for (1) and (2) were 24 and 50, respectively. Linearity was between 50 and 300 ng/zone for (1) and 125 and 1225 ng/zone for (2). Intermediate precision was below 2 % (n=3). The LOD and LOQ were 3 and 10 ng/zone for (1) and 2 and 7 ng/zone for (2), respectively. Recovery rate was between 102.6 and 108.8 % for (1) and (2).

J. Planar Chromatogr. 32, 505-510 (2019). HPTLC of rivaroxaban on silica gel with toluene - methanol 7:3. Quantitative determination by absorbance measurement at 250 nm. The hRF value for rivaroxaban was 63. Linearity was between 100 and 600 ng/zone.  Intermediate precision was below 2 % (n=3). The LOD and LOQ were 3 and 9 ng/zone. Recovery rate was between 101 and 102.3 %.