Abstract G-28, IPC (2005). HPTLC of rosuvastatin on silica gel with chloroform - methanol - toluene 3:1:1. Quantitative determination by absorbance measurement. The hRf value of rosuvastatin was 53, recovery rate was between 98-102 %, LOD was 8 ng/spot and LOQ 26 ng/spot.

J. AOAC Int. 88, 1549-1554 (2005). TLC of polymyxin B, framycetin, and dexamethasone on silica gel with methanol and methanol - n-butanol - 25 % ammonia - chloroform 14:4:9:12 for framycetin and polymyxin B. Quantitative determination by densitometry at 550 nm after detection with 0.3 % ninhydrin solution. Dexamethasone was separated with cyclohexane - ethyl acetate 2:3, quantitative determination by absorbance measurement at 245 nm. Similar accuracy, relative standard deviation values from 1.49 to 2.47 % and relative error values from 0.02 to 0.81 % are comparable to those obtained with the reference methods.

J. Chinese Trad. Patent Med. (Zhongchengyao) 27 (3), 272-275 (2005). TLC of the extracts on silica gel with 1) n-hexane - chloroform - methanol 15:8:2; 2) n-hexane - ethyl acetate 9:1; 3) chloroform - benzene - glacial acetic acid 7:2:1. Detection 1) by exposing to iodine vapours; 2) under UV 365 and 254 nm. Identification by comparison with the standard. Quantification of usnic acid by densitometry at 290 nm. Validation by investigating the linearity range (0.50 - 2.50 µg/spot, r = 0.999), precision (RSD = 2.26 %, n= 5, within plate, and 2.97 %, n = 5, plate-to-plate), and standard addition recovery (97.5 %, RSD = 2.61, n = 5).

Abstract DP-15, IPC (2005). HPTLC of forskolin in herbal extract and opthalmic preparation (prepared from methanolic extracts of Coleus forskohlii roots) on silica gel with toluene - ethyl acetate 17:3. Quantitative determination by absorbance measurement at 292 nm. The method was found to be reproducible, accurate and precise.

III. Separation on various stationary phases. J. Liq. Chrom. & Rel. Technol. 27, 2613-2623 (2004). TLC of cholic, glycocholic, glycolithocholic, deoxycholic, chenodeoxycholic, glycodeoxycholic, and lithocholic acid on different preparations of silica gel and a mixture of silica gel and Kieselguhr with n-hexane - ethyl acetate - acetic acid in various volume compositions; successful separation was achieved with the compositions 4:4:1 and 22:21:5. Detection by 10 % aqueous sulfuric acid followed by heating at 120 °C for 20 min. Densitometric measurement at 250 nm.

Talanta 60 (5), 945-953 (2003). TLC of linezolid from its alkaline degradation product on silica gel with isobutanol - ammonia 9:1. Quantitative determination by densitometric measurement at 244 nm. The proposed method and two other methods (based on spectrophotometry) were successfully applied to the determination of the drug in bulk powder, in laboratory prepared mixtures with its degradation product and in commercial tablets.

J. Chinese Trad. Patent Med. (Zhongchengyao) 27 (6), 659-662 (2005). TLC of extracts of Yupingfeng oral liquid on silica gel with 1) cyclohexane - ethyl acetate 7:3. Detection by spraying with 5 % p-dimethylaminobenzaldehyde in H2SO4 - ethanol 1:9 and heating at 105 ºC until the spots are visualized. Identification by fingerprint techniques. Quantification of astragaloside by HPLC. The results for eight real life samples are given.

J. Chinese Trad. Patent Med. (Zhongchengyao) 27(7), 775-777 (2005). TLC of extracts of Suzi Jiangqi pills on silica gel with 1) petroleum ether (60 - 90 ºC) - ethyl acetate 9:1; and 2) chloroform - ethyl acetate - methanol - water 15:40:22:10. Detection 1) under UV 365 nm; 2) 10 % H2SO4 in ethanol followed by heating until the spots are visualized. Identification by fingerprint techniques. Quantification of hespiridin by HPLC. The results for five batches of real life samples are given. Discussion of the application of the procedures for the quality control of the medicine.