J. Planar Chromatogr. 4, 246-250 (1991). HPTLC of benzodiazepines, 3,4-methylenedioxyamphetamine, N-methyl-3,4-methylenedioxyamphetamine, N-ethyl-3,4-methylene-dioxyamphetamine) and caffeine on silica. Eluents for benzodiazepines: trichoromethane – acetone 8:2; MDA, MDMA, and MDE were developed with a 25 step AMD gradient employing toluene, 2-propanol, NH3, ether and ethanol; eluent for caffeine was dichloromethane – methanol 9:1. Detection by FTIR scanning.

J. Agric. Food. Chem. 42, 381-387 (1994). Analytical and preparative TLC of moxidectin and metabolites on silica with dichloromethane - ethyl acetate - formic acid 34:6:8, on RP-18 with acetonitrile - water 18:2; incremental multiple development TLC procedure was used to separate and isolate metabolites on RP-18 silica with acetonitrile - water 9:1 and on silica with ethyl acetate - hexane 5:2. Radioactive zones located by autoradiography.

J. Planar Chromatogr. 9, 113-115 (1996). HPTLC of 6 herbicides (diuron, isoproturon, linuron, metoxuron, monolinuron, neburon) on silica by AMD using a 25-step gradient based on acetonitrile - dichloromethane - acetic acid - toluene - hexane. Densitometry at 245 nm (absorbance).

CBS 85, 10-11 (2000) HPTLC-AMD of water samples on silica gel with 33-step gradient from acetonitrile - ammonia to dichloromethane and dichloromethane - acetic acid to n-hexane. Detection via Chrom Biodip (Merck) by dipping in bacteria solution (Bacillus subtilis) followed by incubation at 30 °C over night and spraying with MTT-tetrazolium salt reagent followed by incubation at 30 °C for 5-30 min. Visual evaluation.

J. Planar Chromatogr. 19, 223-227 (2006). HPTLC of leuprolide acetate (a synthetic nonapeptide analog) on silica gel after prewashing with chloroform - methanol 1:1 using five-step isocratic incremental multiple development with ethyl acetate - methanol - 25 % ammonia. Detection under UV light at 254 and 280 nm. Quantitation by reflectance scanning at 280 nm.

J. AOAC Int. 91, 1237-1243 (2008). HPTLC of zinc bis(O,O’-diisobutyl dithiophosphate), zinc bis(O,O’-didodecyl dithiophosphate), and Aglamol 99 on RP-2 by automated multiple development with methanol - water - acetic acid 6:3:2 for 25 mm, then acetonitrile - water 11:9 for 60 mm, and again acetonitrile - water for 80 mm, or on silica gel with a 14-step gradient based on toluene. For derivatization, the plate was dipped in a solution of 0.05 % primuline in acetone - water 4:1 for 1 s and immediately dried in warm air. Quantitative determination by fluorescence measurement at 366/>400 nm and by absorbance measurement at 220 nm. HPTLC-ATR-IR and HPTLC-FTIR, as well as HPTLC/DART-MS and HPTLC/ESI-MS were applied for identification.

J. Chromatogr. A 1462, 134-145 (2016). Development of simple method for the separation of different colored pigment formulations used in the printing materials on food packaging to control the quality and safety of the package. HPTLC on silica gel by automated multiple development with a 9-step gradient based on ethyl acetate, methanol and water, and ending with toluene. Good resolution of differently soluble constituents of the pigment formulation like additives and coating materials. The results obtained by multi-detection allowed a first assignment of the differently detectable bands to particular chemical substance classes, enabled the comparison of different commercially available pigment batches and revealed substantial variations in the composition of the batches. Characterization of single unknown pigment constituents by HPTLC-MS and HPTLC combined with ATR-FTIR. The new HPTLC method for routine quality control for incoming pigment batches and monitoring of internal pigment production processes secures a consistent pigment composition, resulting in consistent ink quality. Hyphenation of HPTLC with the Aliivibrio fischeri bioassay revealed information on the toxicological potential of different pigment compounds which helps guarantee consumer safety, especially in regard to readily permeable pigment components.

J. Planar Chromatogr. 4, 255-257 (1991). HPTLC of progesterone, testosterone, testosterone hydrogen sulfate sodium salt, 20ß-hydroxy-4-pregnene-3-one, 2-methoxy estrone, coprostane, hydrocortisone on silica with a gradient consisting of methanol – ethyl acetate – chloroform – methylene chloride (first inverse gradient program) and of methanol – chloroform (second inverse gradient program). Detection under UV 254 nm. Quantification by densitometry.