J. Pharm. Sci. & Res. 2(2), 143-148 (2010). TLC of salbutamol sulphate (SS), bromhexine hydrochloride (BH), and etofylline (ET) in fixed dose formulation on hand-made silica gel plates with methanol – n-hexane 2:1. All three compounds were well separated with hRf values of 25 for SS, 71 for ET and 91 for BH. Detection at 254 nm as well as by exposure to iodine vapors. For spectophotometric quantification the bands of the selected drug in sample and standard mixture were scraped off, suspended in methanol, and the absorbance was measured at the maximum absorbance wavelength of each compound.

CBS 112, 9-11 (2014). HPTLC of sibutramine on silica gel with toluene - methanol 9:1 with chamber saturation for 20 min, developing distance 70 mm. Quantitative absorbance measurement at 225 nm. A polynomial calibration curve was established in the working range of 78-3022 ng. Intermediate precision was between 2-9 %. The hRF of sibutramine was 53. The recoveries were between 96-104 %. For confirmation the sibutramine zone was eluted from the plate with the TLC-MS Interface and identified by MS. Among 52 tested commercial slimming products 26 were adulterated with sibutramine.

J. Chromatogr. 437, 59-82 (1988). TLC of 54 amines on silica with benzene and benzene - ethyl acetate - acetone 100:5:1. Detection by spraying with N-chloro-2,6-dichloro-P-benzoquinone monoimine in buffered alkaline medium. Identification of several imprecisely defined products. Establishment of theoretical correlations between chemical structures, Rf values and colors of spots.

Acta Chimica 128, 819-822 (1991). TLC of bulgaramine on silica with dichloromethane – ethanol 10:1. Visualization under UV or by exposing to iodine vapor.

J. Chromatogr. Sci. 33, 383-385 (1995). Study of the TLC behavior of 27 aromatic amines on silica and silica impregnated with aqueous solutions of various Na salts, i.e. chloride, hydroxide, nitrate, nitrite, acetate, sulfate and H phosphate, etc., and with cyclohexane - benzene 1:4. Comparison of results on silica with those on impregnated silica. Discussion of the effects of the nature of substituent groups and the number of C atoms in the molecule on the mobility of amines.

J. Liqu. Chromatogr. 23, 2653-2668 (2000). HPTLC of dansyl derivatives of putrescine, cadaverine, spermidine, and spermine on silica gel with chloroform - triethylamine - polyoxyethylene-10-lauryl ether 8:4:5, light protected. Quantitation by fluorodensitometry at 338 / 502 nm. Sensible, sensitive, precise and accurate procedure.

J. Chromatogr. A 1045 (1-2), 223-232 (2004). TLC of dansyl derivatives of biogenic amines (agmatine, putrescine, tryptamine, cadaverine, spermidine, histamine, spermine, tyramine and beta-phenylethylamine) with chloroform - diethyl ether - triethylamine 6:4:1, followed by chloroform - triethylamine 6:1. Quantitative determination by fluorescence measurement at 330/>400 nm. Correlation coefficients of linear regressions were higher than 0.99 for all amines, except for agmatine (0.976). Detection limits were 10 ng for tryptamine, tyramine, histamine and ß-phenylethylamine, and 5 ng for the other amines. The overall repeatability of the chromatography was 1.82 % when including agmatine and barely 1.02 % for the other amines. The accuracy ranged from 105.97 % (agmatine) to 49.92 % (tryptamine). This thin-layer chromatography method was found to be an effective and precise analytical procedure to separate and determine biogenic amines. Its main advantages compared to previous procedures are that it uses less harmful solvent (diethyl ether instead of benzene) and can separate a larger group of biogenic amines.

Chromatographia 37, 133-143 (1993). TLC method for the determination of catecholamines in human urine. Separation on NH2-modified silica, followed by in-situ visualization by heating. Discussion of possibilities to use this derivatization technique for other urine components, such as creatine, creatinine, uric acid and glucose.