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. 408, 135253 (2023). HPTLC of genotoxic compound zones in 33 oils on silica gel with chloroform - ethanol 5:1, up to 20 mm, then with n-hexane - diethyl ether 2:1, up to 40 mm, and finally with n-hexane - toluene 1:2 up to 60 mm. Detection in white light, UV 254 nm and 366 nm. Genotoxicity bioassay by spraying with Salmonella suspension with or without the S9 mixture (fraction from phenobarbital/β-naphthoflavone-induced lyophilized rat liver strain), followed by incubation at 37 °C for 3 h. The plate was dried and FDG (fluorescein di(β-D-galactopyranoside)) was sprayed, followed by incubation at 37 °C for 15 min. Cytotoxicity bioassay by spraying with MTT solution (0.2 % in phosphate buffer) after incubation with the Salmonella culture, followed by analysis under white light. Confirmative detection of aliphates was performed via a reagent sequence on the same plate by spraying with 1) Rhodamine 6B reagent, followed by detection in UV 366 nm and 2) phosphomolybdic acid reagent, followed by heating at 120 °C for 10 min, and documented at white light illumination.

Food Chem. 134184 (2023). HPTLC of 45 berry cultivars belonging to the nine species strawberry, raspberry, blackberry, black currant, blueberry, gooseberry, cape gooseberry, chokeberry, and goji berry on silica gel with toluene - ethyl acetate - formic acid - water 15:30:5:3. Detection by dipping into a 0.5 % solution of 2-aminoethyl diphenylborinate in ethyl acetate, followed by drying and dipping into a 5 % solution of PEG 400 in dichloromethane. Qualitative analysis under UV light at 366 nm. 

Food Chem. 133108 (2022). HPTLC of 135 baobab samples (Adansonia digitata) from different agroecological regions on silica gel with toluene - ethyl acetate - methanol - formic acid - water 60:50:25:3:5. Detection by dipping into aniline diphenylamine o-phosphoric acid reagent, p-amino benzoic acid reagent, or p-anisaldehyde sulfuric acid reagent, followed by heating at 120 °C for 5 min. Qualitative analysis under UV light at 254 nm. fluorescence detection at 366 nm and white light illumination. 

Marine Drugs 20(12), 757 (2022). Samples were ethyl acetate macerates and diethyl ether Soxhlet extracts from invasive Caulerpa cylindracea and non-invasive C. lentillifera (Caulerpaceae), as well as caulerpine (bisindole alkaloid) as standard isolated from one of the extracts. TLC on silica gel with petroleum ether – diethyl ether 1:1. Quantitative evaluation by densitometry at 330 nm, quantification of caulerpine (hRF 41, LOD 20 ng/zone, LOQ 68 ng/zone). The concentrations of caulerpine in C. cylindracea extracts (96-112 µg/g) were higher than in C. lentillifera (0-8 µg/g).

Marine Drugs 17(3), 148 (2019). Samples were ethyl acetate extracts of seagrass Amphibolis antarctica (Cymodoceaceae), and of algae: Austrophyllis harveyana (Kallymeniaceae), Carpoglossum confluens, Cystophora harveyi, C. monilifera, C. pectinata and C. subfarcinata, Myriodesma integrifolium, Sargassum lacerifolium (Sargassaceae), Codium fragile subsp. tasmanicum (Codiaceae), Ecklonia radiata (Lessoniaceae), Hypnea valida, Rhodophyllis membaneacea (Cystocloniaceae), Hormosira banksii (Hormosiraceae), Perithalia caudata (Sporochnaceae), Phyllospora comoasa, Scytothalia dorycarpa (Seirococcaceae), Plocamium dilatatum (Plocamiaceae), and epiphytic brown algae. HPTLC on silica gel (pre-washed with methanol and heated 30 min at 100 °C) with n-hexane – ethyl acetate – acetic acid 15:9:1. Derivatization by immersion: A) into anisaldehyde – sulfuric acid reagent, followed by 10 min heating at 105 °C, for the detection of steroids and terpenes; B) into DPPH• (0.2 % in methanol), followed by 30 min incubation in the dark, for the detection of antioxydants; C) into Fast Blue B solution (0.1 % in 70 % ethanol) for detection of phenols (with alkylresorcinols detected as dark purple zones on colorless background). Effect-directed analyses were performed directly on the plates. D) α-Amylase inhibition assay by immersion into enzyme solution, incubation 30 min at 37 °C, immersion into substrate solution (starch 2 % in water), incubation 20 min at 37 °C and immersion into Gram’s iodine solution for detection (inhibition zones appear blue on white background). E) Acetylcholinesterase (AChE) inhibition assay (after neutralization by immersion into phosphate buffer) by immersion into enzyme solution, incubation 30 min at 37 °C, immersion into substrate solution (α-naphthyl acetate) and into dye reagent (Fast Blue Salt B). Densitometry through automated scanning, quantification expressed as equivalents to the respective standards used for calibration curves: A) β-sitosterol (LOQ 1.6 µg/band), B) gallic acid (LOQ 60 ng/band), D) acarbose (LOQ 173 µg/band), E) donepezil (LOQ 96 µg/mL). Alkylresorcinols were detected as antioxydant in C. harveyi and C. pectinata (hRF 88), and in C. subfarcinata (hRF 72, 81, 88). Enzymatic inhibitors in C. fragile were considered as a flavone (hRF 65) and a terpenoid (hRF 77), due to their absorption curves (densitometric scan in range 200-400 nm).

J. AOAC Int. 104, 19-25 (2022). HPTLC of xipamide (1) and triamterene (2) on silica gel with toluene - methanol - ethyl chloride - acetic acid 35:10:5:1. Quantitative determination by absorbance measurement at 300 nm. The hRF values for (1) and (2) were 52 and 37, respectively. Linearity was between 0.3 and 7.0 µg/zone for (1) and 0.3 and 12.0 µg/zone for (2). Inter-day and intra-day precisions were below 2 % (n=3). The LOD and LOQ were 47 and 141 ng/zone for (1) and 75 and 228 ng/zone for (2), respectively. Mean recovery was 100.2 % for (1) and 100.8 % for (2).

J. AOAC Int. 104, 975-982 (2021). HPTLC of methionine (1) and paracetamol (2) on silica gel with butanol - dioxane - toluene - methanol 80:25:35:3. Quantitative determination by absorbance measurement at 220 nm. The hRF values for (1) and (2) were 26 and 83, respectively. Linearity was between 2 and 12 µg/zone for (1) 5 and 30 µg/zone for (2). Inter-day and intra-day precisions were below 1 % (n=3). The LOD and LOQ were 612 and 1856 ng/zone for (1) and 1525 and 4620 ng/zone for (2), respectively. Mean recovery was 101.3 % for (1) and 100.6 % for (2).