J. Food Compos. Anal. 114, 104763 (2022). HPTLC of ergosterol in wheat, on silica gel with ethyl acetate - petroleum ether 3:2. Quantitative determination by absorbance measurement at 282 nm. The hRF value for ergosterol was 45. Linearity was between 40 and 600 ng/zone. Inter-day and intra-day precisions were below 4 % (n=6). The LOD and LOQ were 11 and 36 ng/zone. Recovery was between 103.7 and 107.7 %. 

Marine Drugs 19(3), 161 (2021). Samples were a standard mix (tripalmitin, palmitic acid, cholesterol, phosphatidylcholine) and lipid-enriched extracts of zebrafish larvae (Danio rerio, Cyprinidae), that were anesthetized with tricaine after having being treated with 11 extracts of cyanobacteria strains and/or with a green fluorescent lipid analogue of fatty acids (BODIPY-C16, bore-dipyrromethene derivative). HPTLC on nano silica gel in 3 steps: 1) and 2) with chloroform – methanol – water 12:6:1 (twice up to 4 cm); 3) hexane – diethyl ether – acetic acid 160:40:3 (once up to 9 cm). Derivatization of lipids by spraying primuline solution (0.01 % in acetone – water, 3:2). Quantification based on fluorescence peak area intensity, was performed using image software on pictures taken through a green fluorescence imager. Triglycerides were decreased in the case of larvae treated with 2 extracts of Synechocystis strains (Merismopediaceae), but the levels of other lipid classes were not affected. No treatment significantly affected the incorporation of BODIPY-C16 into any of the lipid classes of the larvae.

Food Chem. 133610 (2022). HPTLC of hormonal active compounds in 68 different botanicals on silica gel with ethyl acetate - toluene - formic acid - water 16:4:3:2. The plate was neutralized by spraying with citrate phosphate buffer (6 g/L citric acid monohydrate and 10 g/L disodium hydrogen phosphate in double-distilled water, adjusted to pH 12 by solid sodium hydroxide). To overcome diffusion caused by long bioassay incubation, zone fixation was achieved by coating with polyisobutyl methacrylate (0.25 % Degalan in n-hexane), followed by drying. The prepared yeast cell culture was piezoelectrically sprayed onto the plates, followed by incubation at 30 °C for 4 h. The substrate solution (2 mg 4-methyl umbelliferyl-β-D-galactopyranoside in 100 μL dimethyl sulfoxide and 3 mL citrate buffer) was piezoelectrically sprayed, followed by incubation at 37 °C for 1 h, dried, and documented by fluorescence light detection at 366 nm. The resulting NP-HPTLC–UV/Vis/FLD–pYAVAS–FLD bioassay allowed the detection of androgens, antiandrogens, false-positive antiandrogens, and synergists in complex mixtures.

J. Planar Chromatogr. 35, 501-507 (2022). HPTLC of β-sitosterol the seeds of Syzygium cumini on silica gel with toluene - ethyl acetate - methanol - glacial acetic acid 6:3:2:1. Detection by dipping into anisaldehyde sulfuric acid solution for 3 s, followed by heating at 80-100 °C for 2-3 min. The assessment of α-amylase inhibitors was performed by dipping into enzyme solution (10 mg α-amylase enzyme in 20 mL of sodium acetate buffer and stored at 2–8 °C) for 2–3 seconds, followed by 90 min humidification in a desiccator and the dipping into a 1 % starch solution as a substrate and put in a humid environment for additional 20–30 min to allow the enzyme–substrate interaction to occur. After a 2–5-min time, the plate was washed or dipped in Gram’s iodine blue, which revealed anti-diabetic activity as blue stains on a white background. The hRF value for β-sitosterol was 87. Further analysis by high‑resolution mass spectrometry.

J. Planar Chromatogr. 35, 403-410 (2022). HPTLC of β-sitosterol (1), ferulic acid (2), berberrubine (3), griffonilide (4) and lithospermoside (5) in Semiaquilegia adoxoides on silica gel with cyclohexane - ethyl acetate 3:1 for (1), toluene - ethyl acetate - methanol - formic acid 50:40:5:12 for (1) and (2), n-butanol - acetic acid - water 21:3:6 for (3) and  chloroform - methanol - water 12:6:1 for (3) to (5). Detection of (1) and (2) by spraying with 10 % sulfuric acid in ethanol, followed by heating at 105 °C. Analysis under UV light at 254 and 366 nm.

CBS 125. HPTLC of estrogen-active compounds in a migrate of a food contact material on silica gel with chloroform - acetone - petroleum ether 11:4:5. Planar Yeast Estrogen Test (P-YES) was performed by spraying 2 mL yeast cells onto HPTLC plates, followed by incubation at 30 °C for 3 h and spraying with 2 mL 0.5 mg/mL 4-methylumbelliferyl-beta-D-galactopyranoside and incubation for 20 min at 37 °C. The method was compared with microtiter bioassay (L-YES). P-YES was more sensitive than L-YES and results can be repeated upto one year later.

J. Planar Chromatogr. 35, 189-195 (2022). Planar yeast estrogen screen (pYES) of estriol, daidzein, genistein, 17β-estradiol, 17α-ethinyl estradiol, estrone, 4-nonylphenol and bis(2-ethylhexyl) phthalate on silica gel with cyclohexane - methyl ethyl ketone 2:1 or cyclohexane - cyclopentyl-methyl ether 3:2. Detection under UV light at 272 nm.

J. Planar Chromatogr. 35, 13-21 (2022). HPTLC of guggulsterone E (1) and Z (2) in Commiphora mukul on silica gel with toluene - acetone 9:1. Quantitative determination by absorbance measurement at 250 nm. The hRF values for (1) and (2) were 18 and 23, respectively. Linearity was between 60 and 360 ng/zone for (1) and (2).