J. Agric. Food Chem. 48, 648-656 (2000). TLC of e.g. sesamol, vanillic acid, syringic acid, sinapic acid, protocatechuic acid, caffeic acid, tyrosal, hydroxytyrosal and oleuropein on silica gel with toluene - ethyl acetate - formic acid 5:4:1. Detection after staining with 0.4 M DPPHH in methanol.

Planta med. 65, 455-457 (1999). Preparative TLC on silica gel plates of 2-(4-hydroxyphenyl)ethyl 1-dodecyl-octadecanoate on silica gel with hexane - ethyl acetate 7:3 and of ursolic acid with chloroform - ethyl acetate 5:2. Detection under UV 254 nm.

J. Planar Chromatogr. 15, 463-465 (2002). HPTLC and TLC of 3,5-dihydroxybenzoic, vanillic, p-coumaric, p-hydroxybenzoic, gentisic, caffeic, syringic, sinapic, ferulic, protocatechuic, and 2,4-dihydroxybenzoic acid on silica gel and RP-18. Detection under UV 254 and 366 nm and by derivatization with bis-diazotized sulfanilamide. One-dimensional HPTLC was performed on RP-18 with methanol - water 2:3 and on silica gel with toluene - dioxane - formic acid 7:2:1 and a gradient of decreasing polarity and formic acid concentration. Documentation by densitometry. 2D-TLC on silica gel with toluene - dioxane - formic acid 7:2:1 in the first direction and, after drying, with a three step gradient elution program in the second direction. TLC on RP-18 was used in the first direction with methanol - water 2:3 After the first development the phenolic acids were transferred to the second silica gel plate with 70% methanol. TLC in the perpendicular direction was then performed with a three-step gradient elution program. The combined methods resulted in separation of all compounds investigated.

CBS 86, 4-5 (2001) HPTLC of 3-methoxy-4-amino azo meta sulphonic acid (MAMASA) on silica gel with n-butanol - diethylamine - ammonia - methanol 9:5:5:2 with chamber saturation for 5 min followed by drying at 40 °C. Quantitative determination by absorbance measurement at 254 nm.

J. Liq. Chrom. & Rel. Technol. 27, 2449-2461 (2004). TLC of oleic, elaidic, ricinolic acid, methyl ricinoleate, alpha-hydroxy-palmitic acid, methyl alpha-hydroxypalmitate, 12-hydroxystearic acid, methyl 12-hydroxystearate, 9,10-dihydroxystearic acid, and methyl 9,10-dihydroxystearate on RP18 with methanol; methanol - water 19:1 and methanol - water 9:1. Detection with iodine vapor.

Indian Drugs 45(4), 301-306 (2008). HPTLC of diclofenac (extracted with 3N HCl and chloroform from single and multi-component diclofenac gel formulations) on silica gel with toluene - ethyl acetate - acetic acid 600:400:2. The hRf value of diclofenac was 39, of salicylic acid 29, and of methyl salicylate 83. Quantitative determination by absorbance measurement at 283 nm. Linearity was between 200 and 600 ng/spot via peak area. In single component gel, recovery was 100.4 % whereas in multi-component gel it was 99.5 %. The method was found to be accurate and suitable for analysis in single and multi-component gel formulations.

International Seminar on Herbal Drug Research, PN-028 (2009). HPTLC of curcumin and 3-acetyl-11-keto-a-boswellic acid in the herbal product Rheumax (contains Curcuma longa, Boswellia serrata, Tinospora cordifolia and Vitex negundo) on silica gel with chloroform - methanol 37:3 for curcumin and n-hexane - ethyl acetate 1:1 for the acid. Quantitative determination by absorbance measurement at 430 nm for curcumin and 254 nm for the acid. The method was linear in the range of 100-500 ng/band for curcumin and 1500-4000 ng/band for the acid.

Research J. Pharm. and Tech. 3(4), 1275-1278 (2010). A stability indicating HPTLC method has been developed for ofloxacin. The results were confirmed by bioautography. HPTLC on silica gel with n-butanol - ethanol - 25 % ammonia 5:5:4. The hRf value was 53. Densitometric evaluation at 299 nm. The method was linear in the range of 500-2500 ng/band. The sample was subjected to forced degradation (acid, base, oxidation, thermal, photolytic) and both degraded and un-degraded sample were analyzed by HPTLC and bioautography. The result obtained by bioautography confirmed that the antimicrobial activity of ofloxacin was directly related to its degree of degradation under different stress conditions. Further no inhibition zone was observed at another hRf than that of ofloxacin, which indicates that degradation products do not exhibit antibacterial activity. Bioautography studies were carried out in petri plates (10 cm diameter) using as media Mueller Hinton agar and as organism Escherichia coli NCIM 2066.