J. AOAC Int. 75, 15-17 (1992). Multiple development and Automated Multiple Development in particular are described as one of the most promising instrumental TLC methods for pesticide analysis, e.g. for determinations in drinking water.

J. Chromatogr. 664, 263-270 (1994). Study of the impact of high temperatures (33°C - 38°C) and high relative humidities (80 - 100%) on the applicability of TLC systems for drug identification. Use of 10 systems for 65 acidic, basic and neutral drugs. Comparison of the Rf values during a six month climatologic cycle in Jakarta, Indonesia. Improvement of the accuracies and reproducibility of the Rf values by Rf value correction, using reference mixtures of standard drugs on each plate.

Dünnschicht-Chromatographie. InCom Sonderband 1996, 212-224. Summary of basic techniques (unidimensional multiple development, incremental multiple development, gradient multiple development, bivariant multiple development; rechromatography with a mobile phase of constant composition; rechromatography with a mobile phase gradient); possibilities and limitations of the method are also reported.

J. Chromatogr. A 816, 97-105 (1998). Use of adsorption TLC to separate proteins with albumin, transferrin, lactoferrin and lysozyme as the model compounds on DEAE anion exchanger with solution containing sodium phosphate, 0.01 M bicine and sodium chloride, Optimization of the pH values for the separation, giving pH 8.5 as the optimum.

I. Preliminary results. J. Planar Chromatogr. 15, 425-428 (2002). Description of a horizontal chromatographic chamber used to study experimentally the principle of planar dielectrochromatography, in particular the increase of the mobile phase front velocity and the dielectrophoretic force generated at granule level on different ready-to-use plates. TLC of a lipophilic test dye mixture (indophenol blue, Sudan red G, 4-dimethylaminoazobenzene) and of a hydrophilic test dye mixture (Brilliant Black BN, amaranth S 75, fast yellow, chryosine) on silica gel, aluminium oxide, and cellulose with benzene and propanol - water - ethyl acetate 6:3:1.

Chemistry of Plant Protection 12, 181-195 (1995). AMD as a TLC technique, which combines the wide range of polarity gradient elution on silica with a separation power similar to HPLC. Application to parallel analysis of 12 samples for some dozens of pesticides. Limit of quantification is 0.05 µg active ingredient per liter. First step allows screening for active ingredients, second step confirms positive results by gradient separation and comparison of UV spectra of sample and standard. Offline-coupling with MS. Standardization as DIN method 38407-part 11 for determination of pesticides in ground and drinking water.

J. Chromatogr. A 1218 (19), 2775-2784 (2011). A multi-enzyme inhibition assay (HPTLC-EI) based on rabbit-liver esterase (RLE) and cutinase following HPTLC allows detection of thiophosphate pesticides. Because choline esterase inhibition is more effective after conversion of thiophosphate thions into their corresponding oxons, a pre-oxidation step was added to the HPTLC-EI assay by using bromine vapor. Bromine was more effective than iodine or UV irradiation for oxidation. It increased the inhibitory strength of parathion, parathion-methyl, chlorpyrifos, chlorpyrifos-methyl, and malathion by 2 orders of magnitude. In contrast, bromine oxidation of organophosphate and carbamate insecticides resulted in a slight reduction in their inhibition factors, due to partial bromination and degradation of the parent compounds. Bromine oxidation increased the inhibition factors for demeton-S-methyl and propoxur. The HPTLC-EI system was applied to the analysis of apple juice and water samples spiked with paraoxon (0.001 mg/L), parathion (0.05 mg/L), and chlorpyrifos (0.5 mg/L) and the mean recoveries were 95-106 % and 91- 102% for RLE and cutinase, respectively.

Anal. Chem. 56, 1035-1037 (1984). Improved detection system suitable for DEAE-cellulose in formic acid media. The new reagent is 1 or 2 orders of magnitude more sensitive than Ni(II)-DMG depending on the type of chelants. The 7 chelants identified were iminodiacetic acid, nitrilotriacetic acid, N-hydroxy-ethylenediamine-N,N',N-triacetic acid, ethylenediamimetetraacetic acid, (glycol ether) diamine-N,N,N',N'-tetraacetic acid, trans-1,2-cyclo-hexanediamine-N,N,N',N-tetraacetic acid, and diethylene-triamine-N,N,N',N-pentaacetic acid.