Chem. J. Chinese Univ. (Gaodeng Xuexiao Huaxue Xuebao) 13, 1383-1385 (1992) Proposal of a new term expressing the degree of overall separation of a multicomponent mixture. Suitable as optimization criterion for TLC conditions.

External punishment function method.) (Chinese). Chinese J. Chromatogr. (Sepu) 13, 379-382 (1995). Proposal of a method for the optimization of the solvent systems of TLC, demonstrated by using sulfa drugs as example. Discussion of the effects of the composition and the proportion of the solvents.

Chromatographia 45, 369-372 (1997). Determination of apparent Rf values of a compound after successive development steps in incremental multiple development (IMD). Prediction of the migration and the zone width of investigated compounds in IMD with linearly and quadratically increasing development distances using naturally occurring compounds as model substances on different stationary phases.

J. Planar Chromatogr. 15, 144-146 (2002). Description of an improved method of two-dimensional development in TLC. The new feature is that before the second development the layer on the glass plate is divided into several zones and these zones can be developed with different mobile phases, instead with the same mobile phase. A mixture of 10 dyes was used to evaluate the technique; the results obtained were satisfactory.

Proc. Intern. Symp. on Planar Separations Plan. Chrom. 153-161 (2003). Optimum Performance Laminar Chromatography (OPLC) is a liquid chromatography technique using planar sorbent beds of low thickness (200 to 500 mm) in which the eluent is injected under pressure allowing parallel separation of samples. OPLC separation and isolation of a mixture of synthesized molecules and plant extract on planar sorbent beds (HTSorb) sealed on 4 edges on silica with e.g. 1)toluene or dichloromethane - ethyl acetate and on 2) RP-18 with a gradient water - acetonitrile 13:7 to 1:1 in 18 min or hexane - ethyl acetate from 99:1 to 1:99. The HTSorb were equilibrated before their use with the starting solution. Detection with optic fibers and Diode Array Detector (200-600 nm). New technique for chromatogram development.

J. Planar Chromatogr. 19, 109-114 (2006). Investigation of a new version of TLC with a closed adsorbent layer and an electroosmotic pump which was placed on the front of the plate and used to induce rapid movement of the mobile phase. Experimental evaluation of the new version of forced-flow TLC suggests that further elaboration of this version of TLC is appropriate.

J. Planar Chromatogr. 21, 77-82 (2008). Ozone can be detected indirectly in TLC or OPLC zones by use of the bioautographic BioArena system and ozone-eliminating molecules (e.g. d-limonene and indigo carmine) in the culture medium. TLC and OPLC of test substances (trans-resveratrol, aflatoxin B1) on silica gel with a variety of mobile phases (e. g. chloroform - methanol 10:1). The developed and dried TLC plates were immersed in a bacterial suspension of Pseudomonas savastanoi for 20 s. Visualization of the chromatograms with MTT was performed either after a a short draining period or after overnight incubation.

J. Planar Chromatogr. 30, 271-274 (2017). HPTLC of the synthetic pyrethroids cypermethrin, deltamethrin, and λ-cyhalothrin on silica gel with n-hexane – acetone 4:1. Detection by spraying with freshly prepared hydralazine solution (37.5 mg in 50 mL 2N sodium hydroxide solution). The hRF value for α-cyano ester pyrethroids was 57.