J. Planar Chromatogr. 27, 132-139 (2014). HPTLC of levetiracetam on silica gel with toluene - ethyl acetate - methanol 2:1:1. Quantitative determination by absorbance measurement at 204 nm. The hRF value for levetiracetam was 50. Linearity was in the range of 1-1000 ng/zone. The intermediate/interday/intra-day precisions were below 1 % (n=6). The LOD and LOQ were 30 and 100 ng/zone, respectively. Recovery was between 99.2 and 100.9 %.

Planta Med. 55, 367-371 (1989). TLC on silica with hexane - ethyl acetate 2:1. Detection under UV 254 nm and by spraying with anisaldehyde - sulfuric acid reagent.

Biochemical Systematics and Ecology 24, 43-47 (1996). TLC of alkamides on silica with hexane - ethyl acetate. Identification by MS.

J. Liq. Chromatogr. Relat. Technol. 40, 297-303 (2017). HPTLC of amygdalin on RP-18 with acetonitrile – water 1:1. Quantitative determination by absorbance measurement at 210 nm. The hRF value for amygdalin was 60. Linearity was between 2.5 and 50 μg/zone. LOD and LOQ were 1 and 4 μg/zone, respectively. The intermediate precision was <2 % (n=3). Recovery rate ranged from 99.9 to 100.6 %.

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.