J. Liq. Chromatogr. Relat. Technol. 33, 903-921 (2010). A variety of TLC-plates impregnated with oils (paraffin, olive, sunflower, corn, castor, cod liver) and fats (margarine butter, pig, sheep, pullet, human) were indirectly evaluated regarding lipophilicity by employing a series of experimental parameters estimated for a representative group of natural sweeteners from retention data. TLC of 13 sugars on oil- and fat-impregnated silica gel layers using five organic solvents as organic modifiers. Best results were obtained with mixtures of acetonitrile and water with chamber saturation for 10 min. Detection of the sugars by treatment with silver nitrate and sodium hydroxide followed by heating at 105 °C for 5 min.

J. Serb. Chem. Soc. 75(4), 513-521 (2010). A TLC method has been reported for prediction of retention behavior of several beta-diketonato complexes of cobalt(III), chromium(III), and ruthenium(III). Aim of this study was to develop a model for accurate quantitative relationships between molecular structures and retention behavior of mixed beta-diketonato complexes. TLC of 36 complexes on silica gel with four mono- and five two-component mobile phases. Quantitative structure - retention relationships (QSSRS) shall allow the prediction of retention of new solutes and structurally similar compounds, as well as their molecular description.

J. Planar Chromatogr. 23, 304-308 (2010). Chromatographic investigation of ranitidin and degradation products by TLC on silica gel, RP-18, alumina, cellulose, and amino phase and by HPTLC on silica gel and amino phase. HPTLC of ranitidin and degradation products in pharmaceutical preparations on silica gel with pure solvents (methanol, ethyl acetate, acetonitrile, and DMSO) and binary mixtures (acetonitrile - DMSO, acetonitrile - methanol, and ethyl acetate - methanol) with chamber saturation. The best separation of ranitidine and its photolytic degradation products was obtained on RP-18 W with methanol - water mixtures in a wide range of concentrations as mobile phase. Detection by spraying with sulfuric acid - methanol 1:4 and heating for 10 min at 120 °C.

Advances in Chromatography 49, 401-429 (2011). Review on TLC and HPTLC for qualitative and quantitative determination of lipids, amino acids, carbohydrates, drugs, steroids, gangliosides, glycosides, pigments, phenols, bile acids, and oligosaccharides in human and animal samples matrices. This chapter is an update of a review article by the same authors on TLC in biological analysis that covered the literature through 2004. The sections describe the steps of biological sample analysis by TLC and HPTLC.

Acta Chromatographica 21(4), 631-639 (2009). HPTLC on silica gel with toluene – ethyl acetate – formic acid 45:55:1. The hRf value was 31. Quantification by densitometry at 284 nm. The limit of quantification was 35 ng/band, recovery was 97.6-101.6 %, and precision 2.19 %RSD. The method was applicable for routine analysis and accelerated stability testing of terbinafine in pharmaceutical drug-delivery systems. It can be used as a stability-indicating method because it separated the drug from its degradation products.

Acta Chromatographica 20(3), 497-511 (2008). HPTLC of 3-acetyl-11-keto-beta-boswellic acid (AKBA) on silica gel with toluene – ethyl acetate 7:3 at room temperature (25 ± 2 °C) in a twin-trough chamber with chamber saturation. Quantification of AKBA (hRf 52) by densitometry in absorbance mode at 250 nm. The linearity was in the range of 200–1200 ng/band (r=0.9989), recovery was 99.4-100.2 %, and the limits of detection and quantification were 3 and 9 ng/band, respectively. AKBA was subjected to various stress conditions: acid and alkali hydrolysis, oxidation, photodegradation, and dry and wet heat treatment. The degradation products were separated from the pure drug with significantly different hRf values.

J. Strait Pharm. 22(11), 90-92 (2010). TLC of components of Yinhu granules: 1) for Artemisia capillaris Thunb. on polyamide phase with acetic acid; 2) for Radix Notoginseng on silica gel with chloroform – methanol – water 13:7:2. Detection 1) under UV 366 nm; 2) by spraying with 10 % sulfuric acid in ethanol and heating at 105 ºC until the zones were visualized.

J. Planar Chromatogr. 24, 113-115 (2011). TLC of dichlorvos on silica gel with cyclohexane - acetone - methanol 16:6:1. Detection by spraying with 2 % sodium hydroxide solution and subsequent spraying with 2 % thiobarbituric solution followed by heating at 90 °C for 10 min. The hRf of dichlorvos was 50. The limit of detection was approximately 18 µg/zone. Spectrophometric analysis of dichlorvos was performed by measuring the absorbance of the sample solution. The linearity was in the range of 50-350 µg/mL dichlorvos. On alkaline hydrolysis dichlorvos forms dimethylphosphoric acid and dichloroacetaldehyde; the latter reacts with 2-thiobarbituric acid to give a sharp pink spot. The reagent is selective for dichlorvos, and does not react with other organophosphorus, organochlorine, carbamate, and synthetic pyrethroid insecticides.