J. Chromatogr. A 1594, 181-189 (2019). Development of a simple and rapid procedure for the determination of quinalphos in human whole blood by HPTLC on silica gel with n-hexane – acetone 9:1 after extraction from spiked blood samples with the optimum solvent, diethyl ether, at pH 3 (average recovery = 93.6%), detection and quantification by densitometry at 325 nm in absorbance mode. Validation by examination of the effect of different organic solvents and pH on the extraction yield of quinalphos, and by investigation of the interference of other organophosphorus pesticides of forensic relevance (not observed). The linearity was in the range of 1 to 100 μg/mL with r2 = 0.9981, the sensitivity (LLOQ) at 1 μg/mL. The within-day precision and between-day precision ranged from 0.2 to 1.0%, and 0.1 to 0.8%, respectively, with an overall average recovery of 91.1% at three concentrations 1, 10, and 50 μg/mL. For different storage conditions for the samples no significant decrease in the concentration of quinalphos was observed. Application of developed procedure in three fatal cases of poisoning.

Food Addit. Contam. Part A. 36, 1218-1227 (2019). Preparative TLC of florfenicol and florfenicol amine in porcine urine on silica gel with dichloromethane - acetone - ammonium hydroxide 20:20:1. Qualitative identification under UV light at 254 nm. Zones were scraped off and extracted for HPLC analysis.

Food Control. 22, 1154-1157 (2011). TLC of histamine in fish and fishery products on cellulose with ammonia - ethanol 1:3. Detection by spraying with Pauly's reagent (equal mixture of 20 mM sulfanilic acid in a 1 M HCl solution and 200 mM sodium nitrite solution, followed by adding 10 % anhydrous sodium carbonate in a 5 % ethanol solution). Color intensity was recorded using a digital camera, followed by imaging processing. Linearity was between 30 and 1000 ng/zone for histamine. Intermediate precision was below 5 % (n=3). The LOD was 20 ppm (2 mg/100 g). Recovery rate was between 93 and 98 %.

Food Control. 103, 111-118 (2019). Thin layer chromatography in tandem with surface-enhanced Raman scattering (TLC-SERS) of histamine in tuna samples on diatomaceous earth plates with ethanol - ammonia 3:1. Detection by spraying with Pauly's reagent (equal mixture of 20 mM sulfanilic acid in a 1 M HCl solution and 200 mM sodium nitrite solution, followed by adding 10 % anhydrous sodium carbonate in a 5 % ethanol solution). Gold nanoparticles were deposited on the plate zone and measurements were performed using a Raman spectrometer with an excitation laser wavelength of 785 nm.

J. Planar Chromatogr. 32, 435-437 (2019). HPTLC of glyphosate in biological material (viscera, liver, spleen, kidney and lungs) on silica gel with methanol - ammonia 9:1. Detection by spraying with chromogenic reagent (2.0 g cobalt(II) chloride and 3.0 g ammonium thiocyanate in 100 mL distilled water). The hRF value for glyphosate was 46. LOD was approximately 3 µg. Recovery rate was 100.2 % for (1), 100.1 % for (2) and 99.9 % for (3).

J. Planar Chromatogr. 32, 431-434 (2019). HPTLC of 2,4-dichlorophenoxyacetic (2,4-D) acid in visceral tissue on silica gel with hexane - acetone - ethyl acetate 7:1:3. Detection by spraying with 4 % potassium ferricyanide, following by spraying with 2% 4-amminoantipyrene solution. 2,4-D was visible in daylight as brick red zone with hRF value of 82. LOD was 0.5 µg for 2,4-dichlorophenoxyacetic acid.

J. Liq. Chromatogr. Relat. Technol. 41, 1052-1065 (2019). Review of the following topics for the period of November 1, 2016 to November 1, 2018: sample preparation for TLC pesticide analysis; lipophilicity and retention studies for the study of biological activity; new reagents for pesticide detection; HPTLC-effect directed analysis on the surface of the layer; TLC-Raman spectrometry for the analysis of thiabendazole, triazophos, and phosmet residues; TLC analysis of radiolabeled pesticides; methods for the separation, detection, and qualitative and quantitative determination of pesticide residues; determination of pesticides in commercial products and the use of TLC for pesticide degradation studies. The review highlighted the isolation, characterization, and determination of less hazardous and less toxic biopesticides from plants, bacteria, fungi, and soil as the most active application area of pesticide TLC today.

J. Planar Chromatogr. 32, 335-338 (2019). TLC of paraquat on silica gel with methanol - ammonia 97:3. Detection by spraying with 1 % phenylhydrazine (0.5 g phenylhydrazine in 50 mL 2 N sodium hydroxide). The hRF value of paraquat was 62.