Anal. Bioanal. Chem. https://doi.org/10.1007/s00216-023-04605-x (2023). HPTLC of 60 pesticides (1), six plant protection products (2), tomato (3) and grape and wine samples (4) on silica gel with n-hexane - ethyl acetate 5:1, n-hexane - toluene - ethyl acetate 4:1:1 for (2), n-hexane - toluene - ethyl acetate 5:1:1 for (3) and n-hexane - ethyl acetate 5:1 for (4). Documentation in fluorescence mode at 366 nm. pYES bioassay application by dipping into a citrate phosphate buffer, followed by drying and dipping into yeast cell suspension, followed by incubation at 30 °C for 3 h. After drying, the chromatogram was immersed into a MUG solution, followed by incubation at 37 °C for 1 h. Detection at FLD 366 nm/ > 400 nm.

Phytochem. Anal. doi:10.1002/pca.3230 (2023). HPTLC of quercetin (1), caffeic acid (2), gallic acid (3) and ferulic acid (4) in three black rice varieties from Northeast India on silica gel with toluene - ethyl acetate - formic acid 7:2:1. Quantitative determination by absorbance measurement at 254 nm. The hRF values for (1) to (4) were 60, 55, 37 and 68, respectively. Linearity was in the range of 0.2-1 µg/zone for (1) to (4). Intermediate precisions were below 2 % (n=3). Mean recovery was 99.5 % for (1) to (4).

Food Res. Int. 173, 113288 (2023). Review of production, bio-activity, and the role of coffee oligosaccharides (COS) as a functional food, including TLC and HPTLC separation and characterization techniques for the analysis of COS.

Food Chem. 416, 135822 (2023). A chip consisting of two parts: a pesticide residue reaction and a separation area cut from a TLC plate was used for the analysis of pesticides dichlorvos, paraoxon and parathion in spiked cabbage, cucumber and spinach with 40 % dd water - acetonitrile solution. Once the pesticide was absorbed by the pesticide enrichment zone, the TLC plate was removed and allowed to dry in the air for 1 min, followed by adding the esterase enzyme solution (prepared from crushed malted barley) and incubation at 37 °C for 3 min. Detection by overlapping with a substrate cromogenic area impregnated with dichloroindophenol acetate. A scanner and digital image-processing was performed to quantify adsorbed substances. LOD was 2 ng/g for dichlorvos, 6 ng/g for paraoxon, and 3 ng/g for parathion.

J. Liq. Chromatogr. Relat. Technol. doi.org/10.1080/10826076.2023.222402445 (2023). HPTLC of polyphenolic compounds in seven different types of monofloral honey on silica gel with methanol - water - formic acid 50:50:1. Detection by heating at 100 °C for 3 min, followed by dipping into NP solution (1 g NP in 200 mL ethyl acetate), drying in cold air and dipping into PEG solution (10 g of PEG in 200mL dichloromethane). Detection under UV light at 254 and 366 nm. The methods allowed discriminating between honeys of different floral origin and also of different source for their authentication.

J. Liq. Chromatogr. Relat. Technol. 46, 1-5 (2023). HPTLC of erythromycin (1), sulfadiazine (2) and trimethoprim (3) in different edible chicken tissues on silica gel with chloroform – methanol - 33 % ammonia hydroxide solution 85:15:1. Quantitative determination by absorbance measurement at 220 nm. The hRF values for (1) to (3) were 7, 42 and 68, respectively. Linearity was in the range of 0.5-10 µg/zone for (1), 0.1-2 µg/zone for (2) and 0.1-1.8 µg/zone for (3). Intermediate precisions were below 2 % (n=3). LOD and LOQ were 200 and 500 ng/zone for (1), 30 and 90 ng/zone for (2) and 20 and 80 ng/zone for (3), respectively. Mean recovery was 99.5 % for (1), 104.1 % for (2) and 98.3 % for (3).

J. Chromatogr. A. 1690, 463775 (2023). HPTLC of estrogen-like and antiestrogen-like compounds in 15 rosé, white and red wine samples of different origin on RP-18 with n-hexane - ethyl acetate 4:1. Bioassay by dipping into the yeast cell suspension, followed by incubation at 30 °C for 3 h and drying for 4 min. Detection by dipping into 40 mL MUG substrate solution (16 mg MUG in 1 mL dimethyl sulfoxide and 39 mL citrate buffer) for 5 s, followed by incubation at 37 °C for 1 h and drying for 2 min. Detection at FLD 366 nm/ > 400 nm. The 10D hyphenation NP-HPTLC−UV/Vis/FLD–pYAES−heartcut–RP-HPLC–DAD–HRMS/MS allowed the  detection of estrogens as well as antiestrogens in the matrix-rich wine.

J. Chromatogr. A. 1588, 137-149 (2019). HPTLC of sugars (1), amino acids (2), gluconic acid (3) and glycerol (4) in 20 wine samples on silica gel with i-propanol - n-butanol - boric acid solution (200 mg/10 mL) - acetic acid 14:6:3:1 for (1), 2-butanol - ammonia solution (25 %) - pyridine - water 19:5:17:13 for (2), methanol - water 7:3 for (3) and acetonitrile - boric acid solution (200 mg/10 mL) 4:1 for (4). Detection of (3) by heating at 190 °C for 20 min, followed by densitometric evaluation at 366 nm. Further detection by dipping into: 1) diphenylamine-aniline-phosphoric acid reagent, followed by heating at 120 °C for 10 min; 2) vanillin-sulfuric acid reagent, followed by heating at 135 °C for 20 min; 3) ninhydrin reagent, followed by heating at 110 °C for 5 min; 4) bromophenol blue, followed by heating at 110 °C for 10 min. Derivatized plates were documented in white light and under UV light at 366 nm. Quantification of (4) was performed using a deuterium/tungsten lamp at 380 nm. Micro planar chromatography was performed using a device, where the HPTLC foil was covered by a thick glass plate with a hole in the center, through which the mobile phase was supplied. Further analysis by mass spectrometry.