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.

J. Planar Chromatogr. 26, 209-214 (2013). HPTLC of pioglitazone hydrochloride on silica gel with chloroform - methanol 10:1. Detection by spraying with 0.5 % o-phthalaldehyde in ethanol, followed by heating at 70 ºC for 15 min. Quantitative determination by scanning with a flatbed scanner and a gel analysis software. Linearity was in the range of 200-3000 ng/zone. LOD and LOQ were 65 and 197 ng/zone, respectively. Recovery was in the range of 98-102 %. Intermediate/interday/intra-day precision was below 2 %.

J. Chromatogr. 320, 281-291 (1985). Reversed-phase TLC of a series of nitroimidazo(2 1-6)thiazoles on silica impregnated with 5 % solution of silicone oil, with glycocoll buffer (0.1M) of pH 13 alone or in various mixtures with acetone or methanol. Determination of RM values. Correlation of extrapolated RM and log k' obtained by HPLC with Hansch values for the derivatives. Discussion of the correlation of their structure with mutagenic activity.

Acta Pharmaceutica Jugoslavica 39, 1-16 (1989). TLC of 8-hydroxyquinoline analogues and 5-nitro-8-hydroxyquinoline on silica with chloroform, chloroform - ethyl acetate 8:2, chloroform - methyl salicylate 9:1, chloroform - amylalcohol 9:1, chloroform - methanol 9:1, benzene - methanol 9:1, ethyl acetate - methanol - acetic acid 15:10:4, ethanol, propanol - water 7:3, NH3 conc. - methanol 1. 5:100, 2. 5:100, 3. 5:100, 4. 5:100, 5. 5:100 and 6. 5:100. Detection under UV 254 nm.

J. Planar Chromatogr. 5, 468-469 (1992). TLC of thioquinanthrene and thioquinanthrene-7-oxide on silica with chloroform - methanol 19:1. Visualization under UV 254 nm. Quantification of the sulfoxide after elution by photometry.

J. AOAC Int. 79, 628-635 (1996). TLC of allantoin in pharmaceuticals on silica with e.g. methanol - acetone - formic acid - water 40:2:1:6 and in urine on cellulose with butanol - acetic acid - water 2:1:1. Detection with pDMAB (Ehrlich's reagent). Quantification by densitometry at 445 nm. TLC as fast and inexpensive semiquantitative method for estimation of allantoin in natural samples.

J. Liq. Chromatogr. Relat. Technol. 29, 2045-2057 (2006). TLC of substituted trans-piperidinones comprising 15 amidolactames and 7 aminolactames on silica gel with 13 mobile phase systems with LSChrom software. The procedure takes into account the adsorption properties of the mobile phase (parameter epsilon), stationary phase, and sample structure expressed by the relevant group.