J. Food Compos. Anal. 126, 105835 (2024). HPTLC of putrescine (1), spermidine (2), and spermine (3) on silica gel with chloroform - triethyl amine 4:1. Quantitative determination by absorbance measurement at 254 nm. Linearity was in the range of 0.2-0.8 mg/mL for (1), 0.1-1 mg/mL for (2) and 0.1-0.8 mg/mL for (3). Intermediate precisions were below 4 % (n=3). LOD and LOQ were 0.07 and 0.21 mg/mL for (1), 0.03 and 0.11 mg/mL for (2) and (3). Recovery was in the range of 96.9-109.4 % for (1), 90.1-109.1 % for (2) and 95.9-109.9 % for (3).

Food Control. 155, 110042 (2024). Review of common saffron adulterants and methods for identifying and quantifying these adulterants, including TLC and HPTLC methods for the identification of synthetic water-soluble acidic colourants.

Food Chem. 432, 137145 (2024). HPTLC of glucose (1), maltose (2) and maltriose (3) released from 10 flour samples with the enzymatic (human salivary α-amylase and porcine pancreatic α-amylase in a pancreatin enzyme mixture) and calcium chloride solution, pre-conditioned for 30 min in 70 % relative humidity with saturated sodium carbonate decahydrate solution. Before starting the enzyme reaction by wetting the application area, the upper plate part was covered with another smaller plate, which was sprayed with 2.5 mL 0.1 M sodium chloride solution to start the enzyme reaction, followed by incubation at 37 °C for 60 min. The plate was developed with acetonitrile - water - 2-propanol - acetone 12:3:4:1 or acetonitrile - water - 2-propanol 3:1:1. Detection by spraying with p‑aminobenzoic acid reagent (2 g p-aminobenzoic acid in 252 mL glacial acetic acid - water - acetone - o‑phosphoric acid 25:25:75:1), followed by heating at 140 °C for 5 min. Chromatograms were documented at 366 nm and the fluorescence was measured densitometrically at 366/>400 nm. Linearity was in the range of 5-800 ng/zone for (1), 10-950 ng/zone for (2) and 47-565 ng/zone for (3). Intermediate precisions were below 16 %. Mean recoveries were between 111 and 112 % for (1) and 106 and 115 % for (2).

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. Planar Chromatogr. 36, 211-221 (2023). HPTLC of syringic acid (1), p-coumarin (2), gallic acid (3), and caffeic acid (4) in Carica papaya on silica gel with toluene - ethyl acetate - glacial acetic acid 85:15:1. Detection by spraying with anisaldehyde-sulfuric acid reagent. Quantitative determination by absorbance measurement at 254 and 366 nm. The hRF values for (1) to (4) were 51, 62, 29 and 38, respectively. Linearity was in the range of 100-600 ng for (1) to (4). Intermediate precisions were below 2 % (n=3). LOD and LOQ were 60 and 200 ng for (1), 30 and 100 ng for (2), 40 and 100 ng for (3) and (4), respectively. Recovery was between 97.3 and 99.7 % for (1) to (4).

Chin J Anal Sci 38 (4), 433-440 (2022). TLC of acetochlor, alachlor, metolachlor, butachlor and pretilachlor in the root vegetables onion and garlic on silica gel with hexane – acetone 4:1. Detection by spraying with 5 % iodized bismuth potassium in acidic aqueous solution. Then QuEChERS (quick, easy, cheap, effective, rugged, safe)-GC-MS/MS method in the selected ion monitoring mode for determination of residues of these compounds after extraction with acetonitrile and acetonitrile - acetic acid and purification by PSA , MWCNTs , GCB and C18 at optimized conditions. The linearity ranged from 0.02 to 2.0 μg/mL for the 5 compounds with the correlation coefficients greater than 0.99, the LOQ was 0.025 mg/ kg, the average recoveries ranged from 72.0 % to 102 % with the relative standard deviations from 0.5 % to 7.9 %.

Front. Nutr. 9, 887992 (2022). HPTLC of 13 mogrosides, 1 flavonoid, and 3 sugars in monk fruit products on silica gel with n-butanol - water - ethanol - acetic acid 70:10:10:2. Detection by spraying with 10 % sulfuric acid in ethanol solution, followed by heating at 105 °C for 10 min. Orthogonal partial least square-discriminant analysis (OPLS-DA) was subsequently conducted allowing the identification mogroside V, 11-oxo-mogroside V, isomogroside V, mogroside IV and sucrose to be the characteristic compounds to distinguish the two types of monk fruits.

Food Chem. DOI: 10.1111/1750-3841.16708 (2023). HPTLC of phenylpropanoids in the leaves of Ginkgo biloba on silica gel with dichloromethane - ethyl acetate 1:1. Detection by spraying with 10 % sulfuric acid ethanol solution, followed by heating. Qualitative identification under UV light at 366 nm. Further analysis by nuclear magnetic resonance. The method allowed the identification of phenylpropanoids suitable for controlling foodborne pathogens.