J. Planar Chromatogr. 23, 84-86 (2010). TLC of 18 drugs (6 antibiotics [benzyl-penicillin procaine, benzyl-penicillin potassium, penicillic acid, tetracycline hydrochloride, oxytetracyline hydrochloride, chlortetracycline hydrochloride], 2 analgesics [aminophenazone, salicylamide], 2 anaesthetics [phenazone, procaine hydrochloride], and one each of anti-rheumatic [penicillamine], anti-inflammatory [metamizole sodium], antitussive [codeine phosphate], broncholytic [aminophylline], spasmolytic [papaverine hydrochloride], hypnotic [phenobarbital], sympathomimetic [ephedrine hydrochloride] and vitamin [ascorbic acid] drugs) on silica gel with butanol - anhydrous acetic acid - water 3:1:1. Detection by spraying with 10 mL each of a solution of (A) 0.25 g titanum dioxide in 0.1 mol/L potassium permanganate, (B) 0.25 g titanium dioxide in 1.0 mol/L potassium iodide, (C) 0.25 g titanium dioxide in 1.0 mol/L potassium bromide, which was the best (most sensitive) one, and (D) 0.25 g titanium dioxide in 1.0 mol/L potassium chloride. After spraying with reagents C and D, plates were illuminated for 10 min, sprayed with 0.1 mol/L silver nitrate solution and illuminated again for 3 min. In all experiments the TLC plates were illuminated by use of UV lamps with the radiation at 366 nm. LODs for most of the drugs studied were in the range 0.2-0.5 µg/spot.

J. Planar Chromatogr. 23, 406-410 (2010). TLC and OPLC of essential oil of thyme (thymol, carvacrol, and linalool as standards) on silica gel with chloroform (previously extracted with a 0.1 % aqueous solution of sodium hydrogen carbonate and dried on sodium sulfate to eliminate the stabilizer amylene, free hydrochloric acid, and chlorine) in an unsaturated chamber. Detection at 254 nm, by spraying with vanillin - sulfuric acid reagent (50 mg vanillin with 12 mL ethanol and 200 mL 98 % sulfuric acid) and heating to 70 °C for 10 min, and by use of the BioArena system. Quantitative determination by densitometry at 275 and 600 nm (dual-wavelength measurement).

J. Chromatogr. Sci. 49, 129-135 (2011). TLC of hydrochlorothiazide (HCT), spironolactone (SPR) and their impurities and degradation products on silica gel with ethyl acetate - chloroform - formic acid - triethyl amine 70:30:1:1. Quantification by densitometry. The different method parameters were optimized for maximum separation. The method was applied for determination of HCT and SPR in commercial tablets. Statistical comparison with the also performed HPLC method showed that there is no significant difference in the performance of the methods.

J. Chromatogr. A 1218 (19), 2700-2711 (2011). A review on TLC coupled with mass spectrometry (MS) for direct identification and structural characterization of the analytes on TLC plates through an interface. According to differences in their operational processes of the TLC/MS techniques reported in the literature the existing TLC/MS systems can be classified into two categories: 1) indirect mass spectrometric analyses, performed by scraping, extracting, purifying, and concentrating the analyte from the TLC plate and then directing it into the mass spectrometer's ion source for further analysis; 2) direct mass spectrometric analyses, where the analyte on the TLC plate is characterized directly through mass spectrometry without the need for scraping, extraction, or concentration processes. Direct MS is conventionally performed under vacuum, but the development of ambient mass spectrometry has allowed analytes on TLC plates to be characterized under atmospheric pressure. Thus, TLC/MS techniques can also be classified into two other categories according to the working environment of the ion source: vacuum-based TLC/MS or ambient TLC/MS.

Anal. Chim. Acta 688 (2), 168-174 (2011). Demonstration of the separation and detection capability of micro-TLC technique involving simple one step liquid extraction of complex materials without need for multi-step sample preparation. Isolation of the target components (cyanobacteria pigments, lipids and fullerenes) from complex matrices including spirulina dried cells, birds’ feathers and fatty oils as well as soot samples derived from biomass fuel and fossils-fired home heating systems. The isocratic separation protocol required less than 1 mL of one component or binary mobile phases. Development was achieved within 5-8 min. Detection by exposure to iodine vapors or by spraying with phosphomolybdic acid reagent.

Acta Chromatographica 21(2), 299-317 (2009). HPTLC of amtolmetin guacil on silica gel with toluene – ethyl acetate 2:3. Identification and quantification by densitometric analysis in absorbance mode at 320 nm. The samples were subjected to acidic and alkaline hydrolysis, oxidation, dry heat treatment, and photo-degradation. The method was suitable for stability studies and to study the kinetics of degradation of amtolmetin guacil.

J. Chinese Modern Med. & Pharm. 18 (1), 40-42 (2011). TLC on silica gel with petroleum ether (60-90 ºC) – ethyl acetate 1:1. Detection under UV 254 nm. Identification by comparison of the fingerprint of the main component, Rehmanniae Radix.

J. Chromatogr. A 1218 (19), 2737-2744 (2011). Investigation of new cellulose tribenzoate/gypsum layers in the ratio up to 8:1 (w/w) for the chiral resolution of closely related aromatic ketones (e.g. tetralones and indanones), alcohols (e.g. benzhydrols) and racemates or enantiomers of other compound classes (e.g. dinitrophenyl amino acids). 16 racemates were baseline or partially resolved by eluting with methanol or 2-propanol/water mixtures on 4:1 (w/w) layers among 22 investigated compounds. The study provided better understanding of the retention and resolution mechanisms on this chiral stationary phase, however, some results were unexpected and confirmed the complexity of enantioseparation mechanisms. Evidence from experimental tests is necessary. Quantification of the investigated compounds by densitometry in the visible region of cellulose tribenzoate/gypsum plates after their exposure to iodine vapours.