J. Planar Chromatogr. 21, 263-265 (2008). HPTLC of nimbolide on silica gel in a twin trough chamber with ethyl acetate - hexane 1:1. Quantitative determination by absorbance measurement at 254 nm. The limits of detection and quantification were 3.3 and 1.0 µg/spot, respectively.

Abstract No. 9154, IHCB (2009). Standardization of Coccinia grandis extract by HPTLC of taraxerol on silica gel with n-hexane - ethyl acetate 9:1 in a twin trough chamber. Detection by spraying with anisaldehyde reagent, followed by heating at 105 °C. Quantitative determination by absorbance measurement at 420 nm. The dichloromethane extract of the plant contained 3.7 % (w/w) of taraxerol.

J. Chinese Trad. Patent Med. 29 (4), 540-542 (2008). TLC of Tianbing Tiaodu capsule extracts on silica gel with cyclohexane - ethyl acetate 4:1. Detection 1) by spraying with vanillin reagent (5 % vanillin in sulfuric acid - ethanol 1:6) and heating until the zones were visualized; 2) under UV 365 nm. Identification by comparison of the chromatograms with that of the standard ferulic acid.

J. Chromatogr. A 1216 (25), 5057-5060 (2009). Paper chromatography of gamma-aminobutyric acid. The method consists of application, separation and detection and is clean, rapid, inexpensive and reproducible compared to the routine paper chromatography. The derivatization procedure with ninhydrin reagent was optimized regarding reagent concentration, derivatization temperature and time and Cu2+ concentration. Quantification of gamma-aminobutyric acid by combination of with Vis spectrophotometry. The limit of detection was 0.05 mg/mL and the linear range was from 0.5 to 20.0 mg/mL. The determination coefficient was r2 = 0.998. The method was accurate (%RSD < 2.6 %), and recoveries were 102.7-103.9 %.

J. Chromatogr. Sci. 48 (1), 26-28 (2010). HPTLC of cefuroxime axetil and ornidazole in combined tablet dosage form on silica gel with toluene - n-butanol - triethylamine 17:4:1. The hRf value of ornidazole was 51 and of cefuroxime axetil 67. Quantification by densitometry at 285 nm. Linearity was between 100 and 500 ng/band for both cefuroxime axetil and ornidazole. The method was used for the assay of the compounds in pharmaceutical formulations. The content of cefuroxime axetil was 102.4 % and of ornidazole 101.0 %.

60th Indian Pharmaceutical Congress PA-219 (2008). HPTLC of rosuvastatin calcium on silica gel with toluene - ethyl acetate - formic acid 9:7:1. Quantitative determination by absorbance measurement at 254 nm. The hRf value was 32. The method was linear in the range of 100-100 ng/spot, recovery was 99.7 %.

J. AOAC Int. 92, 1064-1067 (2009). HPTLC of rabeprazole sodium and domperidone in tablets on silica gel (prewashed with methanol and dried at 110 °C for 5 min) with toluene - acetone - methanol 9:9:1 in a twin trough chamber saturated with the mobile phase for 5 min. Quantitative determination by absorbance measurement at 285 nm. The hRf value of rapebrazole sodium and domperidone was 53 and 32, respectively. Linearity was between 50 and 800 ng/band for both substances.

Abstract No. F-286, 61st IPC (2009). HPTLC of ambroxol (extracted from plasma with diethylether, after centrifugation the organic layer was evaporated and the residue was taken up in 1 mL of methanol) on silica gel with acetonitrile - methanol - triethylamine 41:5:4. Quantitative determination by absorbance measurement at 254 nm.