J. Planar Chromatogr. 17, 280-285 (2004). TLC of flavonoids (quercetin, I3,I8-biapigenin, quercitrin, isoquercitrin, hyperoside, rutin) and phenolic acids (caffeic and chlorogenic acid) on silica gel with ethyl acetate - formic acid - acetic acid - water 100:11:11:26 and ethyl acetate - formic acid - water 8:1:1. Detection by spraying with natural products - polyethylene glycol reagent and observation under UV light at 365 nm. Detection limit for flavonoids was 2.5 µg. Quantitative determination by spectrophotometry, calculated as quercetin. Also TLC of 16 amino acids on cellulose.

60th Indian Pharmaceutical Congress PG-265 (2008). HPTLC of gallic acid in the ethyl acetate fraction of fruits of Phyllanthus emblica on silica gel with toluene - ethyl acetate - formic acid - methanol 30:30:8:2. Detection and quantitative determination of gallic acid by absorbance measurement at 280 nm. The proposed HPTLC method provided a good resolution of gallic acid from other constituents present in the ethyl acetate fraction of fruits of Phyllanthus emblica and can be used for the quantification of gallic acid.

Der Pharma Chemica 2(5), 126-132 (2010). HPTLC of drotaverine hydrochloride (DRO) and diclofenac potassium (DFK) in bulk and pharmaceutical dosage form on silica gel with toluene - ethyl acetate - methanol 1:4:1. Densitometric evaluation at at 298 nm. The hRf value was 28 ± 5 for DRO and 51 ± 5 for DFK. The linearity was in the range of 160-1280 ng/band and 100-800 ng/band. The recovery was in the range of 99.8-101.2 % for DRO and 98.3-101.4 % for DFK.

Asian Journal of Chemistry 22(2), 850-854 (2010). HPTLC of tramadol and paracetamol in pharmaceutical dosage form on silica gel with chloroform - methanol - glacial acetic acid 90:20:1. The hRf value of tramadol was 48 and of paracetamol 68. Densitometric quantification at 270 nm. The method was linear in the range of 500-2000 ng/band for both compounds. Recovery was 98.9-99.7 %.

J. Ethnopharmacol. 134, 992-995 (2011). HPTLC of fumaric acid and fumaric acid conjugates (as dimethyl fumarate) in the aerial parts of Fumaria indica on silica gel with formic acid – chloroform – butanol – heptane 3:4:8:11. Quantitative determination by absorbance measurement at 260 nm.

Pharmacie Globale (IJCP) 4(05), 1-4 (2011). TLC of cefixime and ofloxacin in combined tablet dosage formulation on silica gel with n-butanol - 25% ammonia - water - DMSO 8:3:1:2. The hRf value of cefixime was 55 and of ofloxacin 65. Quantitative evaluation by absorbance measurement at 297 nm. The method was linear in the range of 30-180 ng/band for both drugs.

J. Planar Chromatogr. 26, 21-25 (2013). Online HPTLC of 2,2-Diphenyl-1-picrylhydrazyl (DPPH; 1) and ascorbic acid (2) on silica gel with methanol - water 17:3. Quantitative determination by absorbance measurement at 517 nm. The hRf values for (1) and (2) were 81 and 86, respectively. Linearity was in the range of 2-6 µg/zone for (1) and 1-5 µg/zone for (2). The LOD and LOQ were 3.9 and 13 ng for (1) and 4.5 and 15 ng for (2), respectively. The method allowed for estimation of reduction of DPPH by ascorbic acid. To investigate the applicability of the online reaction, in one set of experiments the reaction of DPPH and ascorbic acid was carried out in test tubes (external reaction), and in another set the reaction was carried out on TLC plates (online reaction) by spiking through application by overspraying of DPPH and ascorbic acid on the same track.

Food Chem. 210, 99-103 (2016). HPTLC of jasmonic acid in gamma-irradiated cabbage on silica gel with isopropanol – ammonia – water 10:1:1. Quantitative determination by absorbance measurement at 295 nm. The hRF values for jasmonic acid was 63. Linearity was in the range of 20-80 µg/zone. The LOD and LOQ were 6 µg/zone and 90 µg/zone, respectively. Recoveries were in the range 95.4-106.3 %.