Tetrahedron 63, 5460-5469 (2007). Preparative TLC of branched oligoamides derived from methyl salicilate on silica gel with dichloromethane – acetone 3:1. Detection under UV 254 nm. Dimerization increases the hRf value from 12 to 46.

J. Liq. Chromatogr. Relat. Technol. 35, 1325-1335 (2012). HPTLC of tolperisone (1) and its impurities 4-methylpropiophenone (2) and piperidine (3) on silica gel with cyclohexane-1,4 - dioxane - isopropanol - ethanol 32:1:2:8 + 1 drop glacial acetic acid. Detection by dipping in a 0.3 % methanolic ninhydrin solution for 10 min, followed by heating at 105 °C for 5 min. Quantitative determination by absorbance measurement at 570 nm. The hRf values of compounds (1) to (3) were 10, 76 and 60, respectively. Linearity was in the range of 60-1500 ng/band for (1), 90-400 ng/band for (2) and 40-250 ng/band for (3). Limits of detection and quantification were 20 and 60 ng/band for (1), 30 and 90 ng/band for (2) and 20 and 40 ng/band for (3), respectively.The intermediate precisions (level 2) for (1) to (3) were 1.6 %, 2.6 % and 2.4 % (n=5), respectively. Recovery for compounds (1) to (3) was between 84.6 and 99.7 %.

(Rapid and sensitive detection of aniline and anilides in simple oils.) Z. Lebensm. Unters. Forsch. 175, 88-92 (1982). TLC of aniline and oleic anilide on silica with dichloromethane-ethyl acetate 95:5. Detection with 10 ml fluorescamine in 20 ml acetone and UV 366; 1 % NaNO2 in 1 N HCl + 0.2 % alpha-naphthaline in KOH or phthalaldehyde. Detection limit with fluorescamine 1 ng, with phthalaldehyde 2 ng.

J. Chromatogr. 504, 456-463 (1990). TLC of title compounds on cellulose or silica with one of the following solvents; 1) 2-methylpropan-2-ol - butanone - propanone - methanol - water - NH3 40:20:20:1:14:5, 2) butanol - propanone - acetic acid - water 35:35:10:20. Detection: spraying with 2,4-dinitrophenylpyridium chloride in methanol 200 mg/L for cellulose and 100 mg/L for silica - placing the plate in sealed glass tank with alkaline atmosphere for 15 min, keeping plate in the dark for 24 h before recording the fluorescence.

Chromatographia 41, 167-174 (1995). Study of the possible relation existing between Rf values obtained for a group of anilines with connectivity indices. Investigation of the corresponding connectivity functions, selected deviations, Snedocor's F and Student's t by using multivariable regression. Discussion of the prediction of the experimental elution sequence for this group of substances on silica layers with various mobile phases of different polarity.

J. Planar Chromatogr. 20, 231-233 (2007). TLC of cadaverine and ornithine on calcium sulfate (and silica gel) with methanol. Detection by spraying with 0.2 % ethanolic solution of ninhydrin and then heating the plates at 110 °C for 15 min. Quantitation by scraping the spot from the plate and measuring the absorbance at 550 nm. The lower limit of detection was found to be 0.75 µg/zone of ornithine.

Journal of Pharmacy Research 3(8), 1997-1999 (2010). TLC on silica gel (plates pre-washed with methanol) with methanol - water - acetic acid 80:20:1. The hRf value of ranitidine HCl was 27 and of dicyclomine HCl was 67. Derivatization by exposure to iodine vapor. Densitometric evaluation at 410 nm. The method was linear in the range of 400-2400 ng/band for dicyclomine hydrochloride and 150-900 ng/band for ranitidine hydrochloride. The mean recovery was 98.8 ± 0.5 % for ranitidine HCl and 99.1 ± 0.8 % for dicyclomine HCl.

J. Planar Chromatogr. 26, 354-357 (2013). HPTLC of free duloxetine in human serum on silica gel with acetone - benzene - triethylamine 10:9:1. Quantitative determination by absorbance measurement at 235 nm. The hRf of duloxetine was 32. Linearity was between 35 and 140 ng/zone. LOD and LOQ were 10 and 35 ng/zone. Recovery (by standard addition) was found to be 92.9-97.6 %. Intra- and inter-day precision values were below 1.8 % and 5.7 %, respectively.