Planta med. 65, 709 (1999). TLC on silica gel of betulinic acid and oleanolic acid with chloroform - methanol 20:1, and of pinoresinol and phillygenin with chloroform - acetone 20:1.

J. Agric. Food Chem. 51, 2237-2241 (2003). One-dimensional TLC of polar lipids on silica gel with chloroform - acetone - methanol - acetic acid - water 10:4:2:2:1 and of nonpolar lipids with petroleum ether (60 - 80°C) - ether - acetic acid 80:20:1. Two-dimensional TLC with chloroform - methanol - water 65:25:4 as first solvent and chloroform - acetone - methanol - acetic acid - water 25:10:5:5:2 as second solvent. Detection by exposure to iodine vapor; quantification by GC after elution.

J. AOAC Int. 87, 545-562 (2004). TLC of CLA (conjugated linoleic acids; octadienoic acids 18:2 with a conjugated double-bond system) on silica gel with hexane - diethyl ether - acetic acid 85:15:1. Visualization after spraying with methanol-sulfuric acid 2:1.

J. Planar Chromatogr. 19, 21-26 (2006). HPTLC of protocatechuic and caffeic acid on silica gel using mixtures of heptane, diisopropyl ether, dichloromethane, and formic acid as mobile phases for multiple gradient development. Quantitation by scanning in absorbance/reflectance mode at 320 nm for caffeic acid and at 260 nm for protocatechuic acid.

Part II. Nicotinic acid and its esters. J. Liq. Chromatogr. Relat. Technol. 30, 2419-2433 (2007). TLC and HPTLC of nicotinic acid and methyl nicotinate, ethyl nicotinate, isopropyl nicotinate, butyl nicotinate, and benzyl nicotinate on RP-18 (prewashed with methanol) with methanol - water and dioxane - water in 10 % volume ratio steps from 100:0 to 0:100 in a chamber saturated for 30 min. TLC on aluminium oxide (prewashed with methanol) with acetone - n-hexane 1:4 provided the optimum conditions for complete separation. Quantitative determination by absorbance measurement at 254 nm.

Asian Journal of Chemistry 23(1), 469-470 (2011). Several herbal formulations were analyzed for gallic acid contents. Tablets were powdered, subjected to hydrolysis by refluxing with 10 % HCl, filtrated and extracted with chloroform. Acidic aqueous extracts were concentrated and the residue was taken up in methanol. TLC on silica gel with ethyl acetate - formic acid 85:11. Gallic acid was observed at an hRf value of 89. Densitometric quantification of gallic acid at 272 nm. The method was linear in the range of 100-3000 ng/band. The method was suitable for analysis of formulations without interference from excipients. Gallic acid contents of different tablet samples varied from 0.06-0.15 % w/w.

International Journal of Pharmaceutical Sciences Review and Research 2(2), 35-39 (2010). TLC on silica gel with methanol - chloroform 1:6. The hRf value was 38 and 68 for ramipril and telmisartan respectively. Densitometric evaluation at 210 nm. The method was linear in the range of 300-3000 ng/band and 500-4000 ng/band for ramipril and telmisartan respectively. The recovery was 98-102 %. The sample was subjected to different stress conditions (acid, base, oxidative, heat, photolytic) and all the degradation products were well separated from drug.

Quim. Nova. 34, 330-334 (2011). TLC of rosmarinic acid in preparations of Rosmarinus officinalis on silica gel with acetone – formic acid – methylene chloride 50:17:170. Detection under UV 366 nm. Quantitative determination by solid state differential pulse voltammetry (DPV). Linearity was between 0.694x10-3 to 0.526x10-3 mol/L. The limits of detection and quantification were 1.2x10-5 and 3.6x10-5 mol/L, respectively. The intermediate/interday/intraday precisions were 3.03 % and 2.2 %, respectively. Recovery (by standard addition) was 96.3 % for rosmarinic acid. The method presented high recovery levels compared to an HPLC method.