J. Chromatogr. 302, 149-158 (1984). HPTLC of polycyclic aromatic hydrocarbons on different stationary phases with various mobile phases in several development modes, conventional, continuous, and multiple development. Reversed-phases in separation using RP-18 silica and methanol - water or methanol - water based ternary solvent system gave the best result.

IV.: Comparison of retention behaviour in gas-liquid, thin-layer and high-performance liquid chromatography. J. Chromatogr. 388, 161-177 (1987). TLC of organometalloid derivatives of amino alcohols on silica with solvent systems consisting of isopropanol and hexane. Detection by iodine vapor and wetting with water. Calculation of Rm values. Comparison of the retention behaviors in GC, TLC and HPLC.

I. Salting-out chromatography of organic compounds. J. Chromatogr. 406, 389-404 (1987). Study on the adsorption on cellulose of organic compounds from aqueous ammonium sulfate solutions. The adsorption increases with increasing concentration of ammonium sulfate for all compounds examined. Investigation of the relationship between RM values and the activity of ammonium sulfate. Conclusion: the mechanism of adsorption is a non-specific hydrophobic interaction.

J. Chromatogr. 475, 95-112 (1989). Studies of the characteristics of some commonly available precoated polar modified TLC plates, using normal and reversed-phase conditions with a series of butyrophenones and benzimidazol-z-ones as model compounds. Examination of the influence of different types of salts, salt concentration, organic modifier content, the use of ion-pair reagents and pH values of retention behavior.

J. Liquid Chromatogr. 14, 1435-1446 (1991). Screening for 140 drugs on silica with toluene - acetone - ethanol - NH3 45:45:7:3 and on RP-18 with methanol - water - hydrochloric acid 50:50:1. Evaluation of the combination for identification with the mean list length method: a value of 1.7 obtained for the present combination, and values of 2.5 and 5.5 for another TLC/RPTLC combination and a TLC/TLC combination, respectively (95% cumultative probability). Study on the influence of Rf correction on RPTLC reproducibility.

Laborscope 2, 5-7 (1997). HPTLC is growing in importance because of its cost effectiveness although it is an off-line system (only the individual steps of TLC are automated). Advantages of TLC are given. Devices for application, chromatography, detection and documentation are presented showing the state of the art in TLC. Also published in CLB 48, 292-293 (1997).

J. Planar Chromatogr. 17, 438-443 (2004). Proposals for general standardized HPTLC methodology: 1. Plate material (consistent material, prewashing, direction of development, activation of plates, influence of relative humidity). 2. Sample application (precise and accurate volume, solvent, position, spot or bandwise application). 3. Preparation and storage of mobile phases (stability, possible reaction). 4. Development (saturation, use of a twin-trough chamber, influence of the vapor phase, distance, drying). 5. Derivatization (dipping, spraying, heating). 6. Documentation of plates. 7. Labeling (plates, images). 8. Quantitative evaluation 8. Documentation of work.

Anal. Bioanal. Chem. 391, 2111-2118 (2008). Review of developments in planar electrochromatography in open (PEC) and closed (PPEC) systems regarding the progress in chamber construction for planar electrochromatography, separating system performance, equilibration of the PPEC process, separation time and selectivity, and the general advantages, disadvantages and prospects of this separation mode. PPEC of 4-cholesten-3-one, 4-androsten-17alpha-ol-3-one acetate, 17R-acetoxyprogesterone, androstenedione, 4-pregen-11R-ol-3,20-dione, benzanilide, o-nitroaniline, hydrocortisone alcohol, and benzamide on RP-18 with 55 % aqueous acetonitrile containing 5 mM acetate buffer (pH 4.7) at 9 kV and under a pressure of 63 atm.