J. Planar Chromatogr. 18, 67-72 (2005). TLC of trans-resveratrol (trans-3,5-dihydroxystilbene), semicarbazide and dimedone (as standards) on silica gel using different mobile phases; OPLC on silica gel with chloroform - methanol 10:1. After drying bioautographic detection by immersion in the bacterial suspension of Pseudomonas savastanoi for 25 s. Visualization with MTT either after a short draining period or after overnight incubation.

Chem. Anal. (Warsaw) 54, 1-12 (2009). An HPTLC method has been developed for estimation of modafinil in tablet formulation and stability assessment. HPTLC on silica gel with toluene - chloroform - methanol 2:2:1. The hRf value of modafinil was 46. Densitometric evaluation at 220 nm. The method was linear in the range of 100-500 ng/band. The sample compound was well separated from all degradation products. The method was suitable for analysis and also for stability studies.

J. Planar Chromatogr. 24, 474-481 (2011). TLC of the active S-(+)-enantiomer escitalopram oxalate (ESC-OX), escitalopram cyanodiol, the R-enantiomer and escitalopram N-oxide impurities on silica gel (containing beta-cyclodextrin as chiral additive) with acetonitrile - 0.1 % acetic acid - water 10:1:6:2 with chamber saturation for 30 min. Using 3 mg urea per 100 cm2 of silica-coated plates as a chiral additive also achieves a good enantiomeric separation with acetonitrile - 1 % acetic acid - ethyl acetate - methanol - water 10:1:2:4:3. Detection at 254 nm. Quantitative determination by absorbance measurement of ESC-OX at 240 nm. The hRf values of ESC-OX, escitalopram cyanodiol, the R-enantiomer and escitalopram N-oxide were 75, 40, 31, and 23, respectively. The linearity was 0.25-10 mg/10 mL (r = 0.9991). Accuracy was 99.7 %. LOD and LOQ were 13 and 44 µg/mL for ESC-OX.

Anal. Biochem. 172, 484-487 (1988). HPTLC on silica with butyl acetate - ethyl acetate 5:1, chloroform - butyl acetate - ethyl acetate 3:3:1, chloroform - butyl acetate - ethyl acetate -triethylamine 12:2:4:1. Preservation of the chromatograms by dipping in 10% paraffin oil in cyclohexane and heating. Quantification by fluorodensitometry at 366/>400 nm. Detection limit, 1-4 p mol.

Chromatographia 40, 96-98 (1995). Study of the behavior and separation ability of cellulose, starch and aminoplast thin-layers with aqueous and non-aqueous mobile phases by measuring the retention of a homologous series of benzamides. Discussion of the retention behavior and separation ability in terms of the nature of the solute, support and eluent.

J. Chromatogr. A 1432, 140-144 (2016). 2-Aminoacetophenone (AAP) is closely correlated with the appearance of the sensory phenomenon of untypical aging off-flavor (UTA) in wine and is generally analyzed by GC/MS after being extracted from wines by liquid-liquid, solid-liquid or solid phase microextraction. Presentation of a rapid, selective and sensitive method for the determination of AAP in wine by HPTLC of the extracts, obtained by liquid-liquid extraction with t-butyl methyl ether followed by a basic cleanup, on amino layer with methylene chloride – toluene 7:3. Detection by dipping into n-hexane-paraffin solution and quantification by densitometry at 366/>400 nm using 2-amino-4-methoxyacetophenone as internal standard. The LOD and LOQ were 0.1 and 0.3 μg/L, respectively. The recovery was near 100 % for model, white and red wines, while AAP concentrations were >0.5 μg/L in UTA. The results indicated that the method enables the analysis of AAP in wines clearly below the odor thresholds and represents a rapid and convenient screening alternative to existing GC/MS methods.

(Hungarian). (Dehydrogenation accompanied decomposition of pyrido-pyrimidine carboxamide). TLC of 1,6-dimethyl-4-ox-1,6,7,8,9,9a-hexahydropyrido- (1,2a)-pyrimidine-3-carboxamide on silica with chloroform - methanol 92:8. Detection by UV. Photometry after elution.

J. Agric. Food Chem. 38, 1877-1880 (1990). One- and two-dimensional TLC on silica with dichloromethane - methanol 9:1, hexane - benzene - acetone 7:3:1; GC/MS after elution with methanol. Visualization under UV and by autoradiography.