J. Liq. Chromatogr. Relat. Technol. doi:10.1080/10826076.2023.2284707 (2023). HPTLC of iridoids, coumarins, pharmaceutical drugs, flavonoids, triterpenes, sesquiterpenes, steroids, phospholipids and cannabinoids on silica gel with three complementary developing solvents (CDS) of different strength and selectivity. Detection by spraying with Fast Blue Salt B, followed by heating at 100 °C for 3 min. Other detection by spraying with the mixture NP/PEG 1:1, followed by drying for 2 min. Machine learning was applied by evaluating three regressor algorithms for their ability to predict the RF values of 178 chemicals in the low polarity developing solvent. RF values were correlated with polarity related properties such as the octanol/water partition coefficient (SlogP) or the topological polar surface area (TPSA).

J. Liq. Chromatogr. Relat. Technol. doi:10.1080/10826076.2023.2284706 (2023). HPTLC of 19 lemon balm leaf samples on cyano phase with acetonitrile - water - acetic acid 20:30:1. Free radical scavenging activity was detected by dipping into a 0.02 % methanolic 1,1-diphenyl-2-picrylhydrazyl (DPPH) solution. Rosmarinic acid was identified by HPTLC–high-resolution mass spectrometry (HRMS). 

J. Liq. Chromatogr. Relat. Technol. doi:10.1080/10826076.2023.2284737 (2023). HPTLC of quercetin (1), myricetin (2), tannic acid (3), gallic acid (4), ellagic acid (5), ascorbic acid (6) and humic acid (7) on silica gel with toluene - ethyl acetate - formic acid - methanol 15:15:4:2 in the first dimension and toluene - ethyl acetate - formic acid 6:3:1 in the second dimension for (1) to (4) and ethyl acetate - acetone - water - formic acid 5:3:1:1 for (5) and (6). Quantitative determination by absorbance measurement at 254 nm. The hRF values for (1) to (5) were 15, 73, 80, 21 and 62, respectively. Linearity was in the range of 100-600 ng/zone for (1) to (5) and (7) and 200-1200 ng/zone for (6). Intermediate precisions were below 2 % (n=3). LOD and LOQ were 26 and 79 ng/zone for (1), 22 and 80 ng/zone for (2), 21 and 64 ng/zone for (3), 31 and 94 ng/zone for (4), 10 and 102 ng/zone for (5), 65 and 197 ng/zone for (6) and 22 and 66 ng/zone for (7), respectively. Average recovery was between 99.1 and 103.1 % for (1) to (7).

J. Liq. Chromatogr. Relat. Technol. 46, 335-342 (2023). HPTLC of carbamazepine in plasma on silica gel with cyclohexane - chloroform - acetic acid 2:2:1. Detection under UV light at 254 nm, followed by photographing with a smartphone. Images were processed using the JustTLC software. The hRF value for carbamazepine was 78. Linearity was in the range of 5-10 μg/mL. Intermediate precisions were below 2 % (n=3). LOD and LOQ were 0.94 and 2.8 μg/mL. Average recovery was 98 %.

J. Liq. Chromatogr. Relat. Technol. DOI: 10.1080/10826076.2023.2284708 (2023). HPTLC of propolis and pollen samples on silica gel with the apolar mixture of toluene - ethyl acetate - methanol 6:3:1 or the mid-polar mixture of ethyl acetate - toluene - formic acid - water 12:4:3:2. Effect-directed profiling by spraying with a bioluminescent Aliivibrio fischeri bacteria suspension and by dipping into a Bacillus subtilis suspension. Acetylcholinesterase inhibition and a- or b-glucosidase inhibition assays were also performed. Selected zones were further analyzed by high-resolution mass spectrometry. 

J. Liq. Chromatogr. Relat. Technol. 46, 11-15 (2023). Review of chromatographic methods for detecting aflatoxins, including HPTLC in various matrices of food, feed, and even herbal medicines. The paper described sample preparation, quantification in herbal formulations and risk assessment.

J. Planar Chromatogr. 36, 201-210 (2023). HPTLC of trehalulose on silica gel with 1-butanol - 2-propanol - 5 mg/mL aqueous boric acid solution 3:5:1. Detection by spraying with aniline - diphenylamine - phosphoric acid reagent, followed by heating to 115 °C for 10 min. Plates were analyzed under white light using three sets of images: remission white, transmission white and remission–transmission white. The hRF value for trehalose was 5 (1) to (3) were 38, 24 and 50, respectively. Linearity was in the range of 100-800 ng/zone. Intermediate precisions were below 2 % (n=3). LOD and LOQ were 20 and 61 ng/zone, respectively. Mean recovery was 102.3 %.

J. Planar Chromatogr. 36, 257-263 (2023). HPTLC of ibuprofen on silica gel with acetic acid - ethyl acetate - n-hexane 5:24:71. Quantitative determination by absorbance measurement at 254 nm. Digital images were taken with a smartphone in a dark room under UV light. Image analysis was performed using the processing software Fiji. Linearity was in the range of 3-5 mg/mL. LOD and LOQ were 0.9 and 2.9 mg/mL, respectively. Mean recovery was 99.9 %.