Chromatographia 35, 275-280 (1993). Determination of the lipophilicity of 14 anti-hypoxia drugs by reverse-phase TLC on paraffin-impregnated silica with 25-60% acetonitrile in steps of 5% containing a changing or constant concentration of buffer. Detection under UV 254 nm. Discussion of the correlation between lipophilicity and the specific hydrophobic surface area of the drugs, and the effect of the concentration of buffer on the retention of the drugs. Comparison of the results with those obtained by reverse-phase HPLC.

J. Chinese Herb Med. (Zhongcaoyao) 26, 243-244 (1995). TLC of paeoniflorin on silica with 1) chloroform - ethyl acetate - methanol - formic acid 200:25:50:1; 2) chloroform - methanol 8:2. Detection and identification by spraying with vanillin-sulfuric acid reagent 5%, and 2) 1.5% 2,4-dinitrophenylhydrazine in sulfuric acid - water 1:4. Quantification by HPLC.

Indian Drugs 33(12), 601-603 (1996). HPTLC on silica with toluene -methanol - triethanolamine 45:5:1. Densitometry at 258 nm. Higher sensitivity and sample throughput in HPTLC than in HPLC.

Biomed. Chromatogr. 12, 78-85 (1998). A review with 126 references on the application of TLC as well as other chromatographic techniques to the analysis of the title materials and medicines, involving quantification of active principles or index components, quality evaluation of crude drugs identification characterization and preparative isolation of new compounds for medicinal use from plants, assay of preparations of plant origin and pharmaconkinetik and pharmacological studies of the drugs.

Chromatographia 53 (Sup.), S-442 - S-444 (2001). Study of the chromatographic behavior of six antihypertensive drugs from the class of ACE inhibitors under conditions of salting-out. TLC on silica gel, cellulose and polyacrylonitrile (PANS) as sorbents, and with different concentrations of aqueous ammonium sulfate solution as solvents. It was established that in all cases studied hRf values decrease with increasing salt concentration in the solvent systems used. A linear relationship of the corresponding RM values and ammonium sulfate content in the solvent was observed. Proposal of a separation mechanism based on hydrophobic interaction between the sorbent and sorbens.

J. Chinese Trad. Patent Med., (Zhongchengyao) 25(5), 402-405 (2003). TLC on silica gel with chloroform - isopropanol - methanol - ethyl acetate - NH3 conc. 80:30:30:30:9. Detection under UV 254 nm. Identification of by finger print technique. Quantitation by densitometry at 270 nm. Publication of the determination results of adenosine, uridine and guannosine in 14 drugs cultivated in different regions. Discussion of the discrepancy among the drugs from different sources, and use of the procedure for the screening and the quality control of the drugs.

J. Planar Chromatogr. 20, 39-42 (2007). Displacement TLC of quaternary pyridinium aldoximes (e. g. pralidoxime and obidoxime) on silica gel impregnated with paraffin oil by continous development with 10 % paraffin oil in n-hexane for 18 h with water - acetone - hydrochloric acid 8:1:1. Detection under UV light at 254 nm.

J. Planar Chromatogr. 28, 234-240 (2015). HPTLC of (1) omeprazole, (2) pantoprazole, (3) rabeprazole and (4) diclofenac from tablets on silica gel previously washed with methanol and activated at 105 °C for 20 min, with toluene - n-butanol - 25 % ammonia 30:70:2. Quantitative determination by absorbance measurement at 290 nm. The hRF values were 67 for (1), 38 for (2), 57 for (3) and 27 for (4). Linearity was between 50 and 500 ng/zone for (1), (2) and (3), and between 150 and 1500 ng/zone for (4). The interday and intraday precisions were below 2 %. The LOD and LOD respectively for (1) were 7 ng/zone and 24 ng/zone, for (2) 9 ng/zone and 30 ng/zone, for (3) 13 ng/zone and 43 ng/zone, and for (4) 25 ng/zone and 82 ng/zone. Recovery was 99.6 % for (1), 100.1 % for (2), 100.4 % for (3) and 100.1 % for (4).