J. Planar Chromatogr. 19, 129-134 (2006). HPTLC of enrofloxacin, oxytetracycline, and trimethoprim on cyano phases with 0.5 M oxalic acid - methanol (5:5; 6:4; 7:3; 8:2). Detection under UV light at 254 nm. Quantitation by videodensitometry at 254 nm.

J. Liqu. Chromatogr. 23, 579-586 (2000). HPTLC of benzo[a]pyrene on hydrocarbon impregnated RP-18 plates with methanol - acetonitrile 1:1. Quantification by densitometry at 370 nm.

Comparison with a GC technique. R.E. KAISER (Ed) "Proc. of the 3rd Int. Symp. on Instr. HPTLC, Wuerzburg", IfC, Bad Duerkheim (1985), 233-246. HPTLC of DDT and DDE extracted from plant material on silica with hexane - ether 9:1. Detection by immersing in 0.1 % diphenylamine ethanolic solution. Activation of the chromatogram for 30 min. under UV at 366 nm. Quantification by fluorometry at 366 nm. Comparison with GC.

J. Chromatogr. A 725, 199-202 (1996). TLC of heavy metals and their complexes with dithizone, 4-(2-pyridylazo)resorcinol and ethylenediaminetetraacetic acid on cellulose, Florisil, Polygram Ionex-25 SA-Na or Polygram Ionex-25 SB-Ac with various solvent systems. Elaboration of the conditions for SPE of the metal ions in the title matrix after microwave mineralization, and in air after alkaline absorption.

Sci. Cult. 74 (1-2), 22-30 (2008). Bio-organic molecules such as oxygenated dibenzo-a-pyrones, their aminoacyl conjugates, and polyprenylbenzo-quinones have earlier been reported as transducers of energy in animals and human cells and were now found in four samples of meteorites. HPTLC on silica gel 60 with 1) n-butanol - acetone - acetic acid - water 7:7:2:4 for amino acids, followed by detection with ninhydrine reagent and densitometric evaluation at 610 nm; 2) n-butanol - acetic acid - water 3:1:2 for sugars, followed by detection with p-anisidine reagent and densitometric evaluation at 380 nm; and 3) chloroform - methanol 9:1 for dibenzopyrones, followed by densitometric evaluation at 240 nm and 360 nm.

J. Sep. Sci. 31, 71-77 (2008). HPTLC of acrylamide in drinking water on silica gel, derivatization in situ with 5-dimethylamino-naphtalene-1-sulfinic acid (1.6 µg/µL in methanol), followed by heating at 120 °C for 1 hour and developed with ethyl acetate. For fluorescence enhacement, the plate was dipped into a solution of 25 % polypropylene glycol in n-hexane and dried immediately. Quantitative determination by fluorescence at 366/>400 nm. Verification was based on HPTLC-ESI/MS, HPTLC-direct analysis in real time (DART)-TOF/MS and NMR. The hRf value of acrylamide (as 3-dansylpropanamide) was 69. Linearity was between 0.1 and 0.4 µg/L. Within-run precision and the mean between-run precision (n=3) were 4.6 and 11.0 %. The limit of detection and quantification for acrylamide was 0.025 and 0.083 µg/L, respectively. Recovery (by standard addition) was 96.4 %. The method showed comparable result with HPLC-MS/MS.

J. Chromatogr. A 1530, 185-191 (2017). Development of a new spray-on method for applying yeast cells to HPTLC plates, leading to a much higher sensitivity of the planar yeast estrogen screen (p-YES), which can serve as a highly valuable and sensitive screening tool for the detection of estrogenic compounds in various sample matrices such as water and wastewater, personal care products and foodstuff. HPTLC of sample constituents and direct detection of estrogenic compounds by spraying with yeast cells. This resulted in much sharper signals compared to those in previous publications. Satisfying results were achieved using cultures with cell densities of 1000 FAU with reduced signal broadening, thus lower LOQ for estrogenic compounds, e.g. estrone 2 pg/zone, 17β-estradiol 0.5 pg/zone, 17α-ethinylestradiol 0.5 pg/zone and estriol 20 pg/zone. Demonstration of the possibility of the method to characterize profiles of estrogenic activity of wastewater samples with high quality and reproducibility by using native samples from wastewater or even surface water directly applied on HPTLC plates without the need for prior sample treatment.

(Determination of pesticides in water - Developing of a multimethod, part 1 and 2.) Wissenschaft und Technik Verlag, Berlin, 1994. ISBN 3-928943-14-6. Review of analyzing up to 275 pesticides by gas and thin-layer chromatography including comparisons of sample preparation and gaschromatographic derivatization techniques (part 1: 210 pages, 110 figures, 37 tables and 265 literature references). Survey of 94 mass spectra of pentafluorbenzyl derivatives and 275 in situ TLC-UV-spectra (part 2).