J. Planar Chromatogr. 5, 431-434 (1992). Investigation of the relationships between solute structure and chromatographic behavior of azine and diazines. TLC of 2,2'-bipyrazyl, 2,2'-biquinoxalyl, 2,2'-bipyridyl, 2,2',2'-tripyridyl, quinoline, 2,2'-biquinolyl, 2-methylquinoxaline, 3,3'-dimethyl-2,2'-biquinoxalyl and g,g'-bipicolyl on Kieselguhr impregnated with a 20% solution of formamide in acetone or with solutions of formamide in acetone containing formic acid. Benzene, trichloroethylene, hexane, chloroform, or heptanol were used as monocomponent mobile phases. Visualization with Dragendorff followed by additional spraying with 18 m sulfuric acid.

J. of Natural Products 51, 973-976 (1988). TLC on silica with ethyl acetate - methanol 9:1, chloroform - ethyl amine 9:1 and chloroform - methanol 9:1. Detection under UV and by spraying with ceric ammonium sulfate reagent.

J. Planar Chromatogr. 15, 466-469 (2002). TLC of 10 porphyrins on silica gel with chloroform - carbon tetrachloride and on RP-18 with methanol - chloroform in varying proportions. After development the plates were dried at room temperature and the spots were detected visually.

J. Planar Chromatogr. 15, 299-305 (2002). TLC of 15 cholic acid derivatives on 9 reversed-phase and 3 normal-phase systems (RP-18, cyano-, polyacrylonitrile-modification and unmodified silica gel) with 9 different mobile phases. Detection by spraying with 50% sulfuric acid and heating. RP-18 combined with mobile phases containing 60-70% methanol or 50-60% dioxane in water can be recommended as the most suitable chromatographic system for the separation of cholic acid derivatives.

Planta med. 65, 759-760 (1999). Preparative TLC of uncarine C and E on RP-18 with methanol - water 3:1.

J. Liq. Chrom. & Rel. Technol. 25, 1515-1520 (2002). HPTLC of nicotinic and iso-nicotinic acid derivatives (3- and 4-[N-4-(2,2,4,4-tetramethyl-piperidinil-1-oxyl)]-carboxamide-1-R (whereR = methyl or R = dodecyl)-pyridinium iodide free radicals)) on silica gel with anhydrous (!) methanol - water 24:1 in a saturated N-chamber. Coupling of HPTLC with EPR involves removing each spot together with the stationary phase from the plate, deposition on the quartz capillary and analysis.

J Young Pharm 1(3), 259-263 (2009). A validated HPTLC method is described for simultaneous estimation of amlodipine besylate and telmisartan in dosage form. HPTLC on silica gel with tetrahydrofuran - dichloroethane - methanol - 25 % ammonia solution 60:20:10:4. The hRf value of amlodipine besylate was 45 and of telmisartan 22. Densitometric evaluation at 326 nm. Linearity was in the range of 1200-7200 ng/band for telmisartan and 400-1400 ng/band for amlodipine besylate. The limit of detection was 149 ng/zone and 53 ng/zone for telmisartan and amlodipine besylate, respectively. The limit of quantification was 453 ng/zone for telmisartan and 161 ng/zone for amlodipine besylate. The recovery was between 100.4 and 100.8 %.

62nd Indian Pharmaceutical Congress Abstract No. F-250 (2010). TLC of risperidone on silica gel with methanol – ethyl acetate 4:1. The hRf value was 34. Quantitative determination by absorbance measurement at 254 nm. The method was linear in the range of 100-600 ng/band. The proposed method was employed for estimation of solubility equilibrium, analysis of mucoadhesive microemulsion formulations and in vitro diffusion studies.