J. Chromatogr. 262, 451-454 (1983). TLC of polyamines on silica with a) butanol - acetic acid -pyridine -water 3:3:2:1, b) butanol - acetic acid -pyridine - formaldehyde 3:3:2:1, and on C8-silica and cellulose with isopropanol - HCl-water 8:3:2. Detection with ninhydrin. Detection of spermine and thermospermine by thin-layer chromatography with a solvent system containing formaldehyde. Di- and polyamines, detected in a variety of living cells, can also be separated by a combination of the three TLC systems described here.

J. Chromatogr. 541, 480-482 (1991). Description of a new, selective method for the detection of o-phenylenediamine and some of its derivatives on TLC plates by treating the chromatograms with Me trichloromethylacetimidate and exposing to pyridine vapor. Detection limits, between 80 and 2000 ng.

HPTLC of resveratrol [(E)-1-(3,5-dihydroxyphenyl)-2-(4-hydroxyphenyl)ethylene], histamine, serotonin and tyramine on silica with ethyl acetate - methanol - NH3 conc. 4:3:1 for biogenic amines and ethyl acetate - heptane 9:1 for resveratrol. Detection 1) by short immersion into solution A (1 g sodium carbonate in 20 mL water, filled up to 40 mL with methanol), drying, and immersion into solution B (20 mg of dansyl chloride dissolved in 20 mL acetone (protect from light; not stable for long)) followed by heating for 2 min at 110°C. Under UV yellow-orange spots against a blue background. Detection 2) immediately after TLC under longwave UV and marking the faint blue zone of resveratrol (for densitometric evaluation). Visualization by exposure to iodine vapor. For stabilization the brown spots can be sprayed with starch solution. Quantification by densitometry at 330 or 360 nm.

Ind. J. Pharm. Sci. 70(2), 233-236 (2008). HPTLC of duloxetine hydrochloride (in bulk drug and in tablet dosage form) on silica gel with chloroform - methanol 8:1. Quantitative determination by absorbance measurement at 235 nm. The method was linear in the range of 40-200 ng/spot. The method was suitable for routine quality control.

62nd Indian Pharmaceutical Congress Abstract No. F-237 (2010). TLC of tolterodine tartarate on silica gel with acetonitrile – water – formic acid 50:50:3. Quantitative determination by absorbance measurement at 281 nm. The method was found to be linear in the range of 1-30 µg/band.

J. Planar Chromatogr. 29, 59-65 (2016). HPTLC of methadone in syrup on silica gel (1) or RP-18 (2) with methanol – 25 % ammonia 10:1. Detection by spraying with 1 mL of Dragendorff reagent. Quantitative determination using a flatbed scanner with a resolution of 16 bits. The hRF of methadone was 44 on (1) and 23 on (2). Linearity was in the range from 60 to 1260 ng/zone. The LOD and LOQ were 100 and 200 ng/zone, respectively. A total relative uncertainty of 6.5 % was achieved.

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.