60th Indian Pharmaceutical Congress PG-256 (2008). HPTLC of rosmarinic acid in Salvia officinalis on silica gel with toluene - ethyl acetate - formic acid 5:4:1. Quantitative determination by absorbance measurement at 328 nm. Linearity was 0.1-1.0 ng/mL, recovery was 99.4 %. The method was found suitable for routine quality control of the Salvia officinalis raw material.

Research Journal of Pharmaceutical, Biological and Chemical Sciences 1(2), 226-234 (2010). TLC on silica gel with toluene - isopropanol - 25 % ammonia 23:23:4. The hRf value was 30. Densitometric evaluation at 258 nm. The linearity range was 100-350 ng/band. For stability studies diacerein was subjected to different stress conditions (acid, alcohol, oxidative, thermal, photolytic). Degradation products were well resolved from the main zone of diacerein with significantly different hRf values.

Eurasian J. Anal. Chem 5(1), 95-103 (2010). An HPTLC method is reported for quantification of glycyrrhetinic acid and apigenin in Glycyrrhiza glabra. Methanolic and acidic-methanolic extracts are subjected to chromatographic separation on silica gel with ethyl acetate - ethanol - water - 25 % ammonia 63:20:4:1. The method was linear in the range of 160-960 ng/band for glycyrrhetinic acid and 32-96 ng/band for apigenin. Glycyrrhiza glabra was found to contain 0.65 % of glycyrrhetinic acid and 0.0004 % of apigenin.

62nd Indian Pharmaceutical Congress Abstract No. F-239 (2010). TLC of cefixime and ambroxol (extracted from human plasma with acetonitrile - methanol 3:1, centrifuged and dried at 40 °C, then dissolved in methanol) on silica gel with acetonitrile – methanol – triethylamine 41:5:4. The hRf values were 27 and 54 for cefixime and ambroxol. Quantitative determination by absorbance measurement at 254 nm. The recovery from plasma was in the range of 69.5-74.4 % for ambroxol and 83.5-87.9 % for cefixime.

International Journal of ChemTech Research 1(3), 677-689 (2009). HPTLC of rosuvastatin in raw material and tablet dosage formulation on silica gel with ethyl acetate - toluene - acetonitrile - formic acid 60:35:5:2. The hRf value was 85. Quantitative evaluation by absorbance measurement at 243 nm. The method was found to be linear in the range of 318-3816 ng/band. The mean recovery was 99.7 %. The sample was subjected to different stress conditions and the degradation products were well separated from the main drug.

J. Planar Chromatogr. 26, 119-124 (2013). HPTLC of methyl- (1), ethyl- (2), propyl- (3), and butylparaben (4) in cosmetics on cyanopropyl plates with water - acetonitrile - dioxane - ethanol 8:2:1:1+1 drop ammonia. Quantitative determination by absorbance measurement at 255 nm and by bioutographic analysis using Vibrio fischeri bacteria. LOD for (3) and (4) was 100 ng/zone, for (1) 80 ng/zone, and 69 ng/zone for (2). The LOQ for (3) and (4) was 120 ng/zone, for (1) 90 ng/zone, and 78 ng/zone for (2).

J. Planar Chromatogr. 29, 66-71 (2016). Controlled gas phase HPTLC of benzoic acids (benzoic o-, m-, p-hydroxybenzoic, 2,4-dihydroxybenzoic, nitrobenzoic, o-, m-, p-aminobenzoic, o- and p-chlorobenzoic, o- and p-bromobenzoic, and o-phthalic acids) on silica gel, RP-18 and polyamide-11 with hexane – 2-propanol 19:1. This variant was based on the use of a gas phase (carbon dioxide, ammonia or acetic acid) moving over the TLC plate for regulation of the stationary and mobile phases. The most considerable change in the retention of benzoic acid derivatives was observed for normal-phase plates due to change of acid-base properties of stationary and mobile phases.

Chromatographia 20, 434-438 (1985). TLC of higher fatty acids having an even number of carbon atoms in their molecule (C10 to C16) on silica impregnated with n-octadecane with a) acetic acid - methanol -water 85:1O:5, and b) propionic acid - methanol - water 85:10:5. Detection by spraying with saturated aq. solution of bromocresol green. Investigation of the validity of the chromatographic binary solution model.