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.

Anal. Chim. Acta 199, 77-83 (1987). TLC of the product of the reaction between caprolactam and p-(N,N-dimethylamino)benzene-p’-azobenzoyl chloride on silica with benzene - ethyl acetate 12:3. Determination of caprolactam by adsorptive stripping voltammetry. Detection limit 0.2 µg/mL.

J. Planar Chromatogr. 3, 511-514 (1990). Chromatography of aromatic amines on silica impregnated with picric acid has been performed using cyclohexane - benzene mixtures as eluents. The best results were obtained with cyclohexane - benzene 1:5 on silica impregnated by development with a solution of 1.0% picric acid in methanol. Mutual separation of carbazole, p-phenylenediamine, and p-toluidine from synthetic mixtures containing variable amounts of the compounds has been realized. The method is rapid, and useful for separation amines at microgram as well as milligram levels.

J. Planar Chromatogr. 8, 216-218 (1995). TLC of p-dimethylaminobenzaldehyde, p-dimethylaminocinnamaldehyde, diphenylamine, carbazol on silica, alumina, cellulose, and a 4:1 mixture of cellulose and silica with various aqueous and nonaqueous mobile phases.

Sz. Nyiredy, A. Kakuk (eds.): Planar Chromatography 2000, Lillafüred, Hungary, 24-26 June 2000, Res. Inst. for Med. Plants, p. 173-181. After prechromatographic derivatization with dansyl chloride OPLC of biogenic amines on HPTLC silica gel with n-hexane - n-butanol - triethylamine 900:100:81 and n-hexane - n-butanol 4:1. Densitometry at 305 nm. The main biogenic amines in red wines were putrescine (41%), agmatine (33%), tyramine (13%) and spermidine (<10%), in white wines were putrescine (37%), tyramine (36%), agmatine (20%) and cadaverine (<10%). OPLC of resveratrol on TLC silica gel with chloroform - methanol 25:2.

J. Planar Chromatogr. 17, 431-434 (2004). HPTLC of six heterocyclic amines (2-amino-9H-pyrido[2,3-b]indole, 2-amino-3-methyl-9H-pyrido[2,3-b]indole, norharmane, harmane, 2-aminodipyrido[1,2-alpha:3’,2’-d]imidazole, 2-amino-6-methyldipyrido[1,2-alpha:3’,2’-d]imidazole) on silica gel by multiple development with diethylether. The mobile phase was selected by using a practical and systematic four-level optimization scheme based on the solvent classification system according to Snyder and the PRISMA model of Nyiredy et al. Quantitative determination by fluorescence measurement at 366/>400 nm was performed immediately after development.

J. Planar Chromatogr. 20, 57-60 (2007). TLC of 5-methylcytosine, tryptamine, melatonin, tryptophan, indole-3-acetic acid, and indole on silica gel with 1-butanol - glacial acetic acid - water 12:3:5 and isopropanol - 25 % ammonia - water 8:1:1. Densitometry at 280 nm.

Int. J. Pharma. Sci. 2(1), 390-394 (2010). TLC of salbutamol sulphate (SS), ambroxol hydrochloride (AH), and theophylline (THE) in a ternary fixed dose formulation on hand made silica gel plates with methanol – n-hexane 21:9. The hRf values were 25 for SS, 72 for THE and 89 for AH. Detection under UV 254 nm and by exposure to iodine vapors. The bands of the respective compounds were scraped off and quantified by spectrophotometry.