Analyst 113, 1605-1606 (1988). TLC of tyramine on silica with 1-butanol - acetic acid - water 15:3:2. Detection by spraying with Pauly’s reagent. Quantification by spectrophotometry at 237 nm after elution with 2M ammonia solution. The method is more reliable than HPLC method.

J. Planar Chromatogr. 5, 239-245 (1992). Study of the HPTLC behavior of closely related diethanolamines on silica developed with 4 binary eluents and evaluation of the effect of solute - solvent association using the thermodynamically formulated Oscik criterion.

CLB Chemie in Labor und Biotechnik 47, 262-263 (1994). HPTLC screening of carcinogenic amines in textiles on silica with dichloromethane - acetonitrile 5:1. Derivatization by diazotation and coupling with N-(1-naphthyl)-ethylenediammonium dichloride. Visual evaluation (pink to blue zones on a pale background). For confirmation of positive results a 15 step AMD gradient on silica from 80% dichloromethane - acetone 1:1 and 20% hexane to 20% dichloromethane - acetone 1:1 and 80% hexane follows. Alternative chromatography on silica with diisopropyl ether - pentane - diethyl amine 12:8:1. Quantification by densitometry (absorbance) at 200, 230, 280 and 360 nm (multi-wavelength-scan). The detection limit of 20 derivatized amines is between 20-200 ng and of not derivatized between 20-400 ng. Sample preparation includes treatment with dithionite reagent, cleaving azo dyes into their component amines. Very effective screening method. Similar topic published: "Identification and determination of carcinogenic amines of the MAK value list III A1/A2." in Int. Lab. Nov., 29-30 (1996); and "Nachweis und Bestimmung verbotener Amine aus der Spaltung von Textil-Azofarbstoffen. (Identification and determination of banned amines derived from textil azo dyes.) in GIT Fachz. Lab. Spez. Chromatogr. 2, 92-94 (1995).

J. Planar Chromatogr. 14, 4-7 (2001). HPTLC of dansyl derivatives of polyamines (putrescine, cadaverine, spermidine, spermine) on silica gel with chloroform - triethylamine 2:1 containing 5% polyoxyethylene-10-lauryl ether (light protected). Quantitative analysis was achieved by in-situ fiberoptic-based fluorescence scanning at 338 and 502 nm. The compounds were determined over the range 0.5 - 85 ng, with relative standard deviations between 0.44-1.16% and detection limits in the range 0.28-0.39 ng. Rapid, precise, and versatile procedure.

Chromatographia 64 (7-8), 423-427 (2006). TLC of six polyamines (ornithine, citrulline, putrescine, cadaverine, spermidine and spermine) on calcium sulfate (CaSO4) and silica gel with 11 different mobile phases, using methanol as the solvent to enhance selectivity and produce differential Rf values. On CaSO4 better separation was achieved than on silica gel, no derivatization is needed, and development time is about 1/3 shorter. Quantitative determination by absorbance measurement at 550 nm after extracting substances from the plates and eluting from the coating material. Limit of detection (LOD) was 750 ng, limit of quantification (LOQ) was 1880 ng. Quantitative separation of underivatized polyamines in spiked human urine samples.

Biomed Chromatogr. 7, 315-316 (1993). TLC of norepinephrine, serotonine and dopamine in rat brain on silica with dichloromethane - acetone - ethyl acetate - methanol 140:60:4:1. Detection by spraying with ethylene diamine - methanol - 0.5% potassium ferricyanide 10:40:10, and incubating for 7 min. at 60°C. Quantification by fluorodensitometry 415/>495 nm.

Asian Journal of Chemistry 22(8), 5951-5955 (2010). TLC on silica gel with cyclohexane - methanol - ethyl acetate - 25 % ammonia 10:3:6:1. The hRf value was 7 for atenolol and 69 for nifedipine. Densitometric evaluation at 230 nm. The linearity was in the range of 3-21 µg/band for atenolol and 1.2-8.4 µg/band for nefidipine. The recovery was 100.7 % for both drugs. The method was found suitable for analysis of the combined dosage form of atenolol and nefidipine without interference of excipients.

Food Addit. Contam. 31, 15-20 (2014). HPTLC of sibutramine in food supplements and soluble beverages on silica gel with toluene - methanol 9:1. Quantitative determination by absorbance measurement at 225 nm. The hRF value for sibutramine was 53. Linearity was in the range of 78-3020 ng/zone. The method was sensitive to detect 0.3 mg of sibutramine per capsule of food supplement and showed comparable results with those obtained with HPTLC-UV and HPLC-MS.