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).

J. Chinese Trad. Patent Med. (Zhongchengyao) 27(5), suppl. 1-3 (2005). TLC of cinnamyl aldehyde in Chongcao Yangshen capsules on silica gel with petroleum ether (60 - 90 ºC) - ethyl acetate 6:1. Detection by spraying with 2,4-dinitrophenylhydrazine reagent. Quantification by densitometry at 514 nm. Validation of the method by investigation of its linearity range (0.0.3 µg - 2.5 µg, r = 0.99); precision (RSD = 1.1 %, n = 5); its reproducibility of five time assay towards the same sample (RSD = 1.2 %); standard addition recovery (99.9 %, RSD = 1.3 %, n = 5). The results for three batches of real life samples are given. Discussion of the application of the procedures for the quality control of the medicine.

Influence of diluents and adulterants. J. Liq. Chromatogr. Relat. Technol. 28, 2875-2886 (2005). TLC of the active components of „ecstasy“ (MDMA, PMA, PMMA, and ephedrine) on silica gel with 10 mobile phases. The simplex method has been employed to find the optimum composition of the eluent chloroform - dioxane - methanol - ammonia - acetonitrile 7:30:4:3:30. Detection under UV light at 254 nm.

59th Indian Pharmaceutical Congress C-43, 234, (2007). HPTLC of Z-guggulsterone (a steroidal ketone present in oily resin of Commiphora mukul) and five marketed ayurvedic tablet formulations containing guggul, on silica gel with toluene - propane-1-ol - glacial acetic acid 8:1:1. Densitometry at 254 nm. The hRf of E-guggulsterone was 55. Several marketed formulations were evaluated for Z-guggulsterone, the UV spectra of the standard and that of the formulations were comparable in respect of Z-guggulsterone.The method was found suitable for evaluation of Z-guggulsterone in presence of other phytochemicals present in formulations.

60th Indian Pharmaceutical Congress PA-202 (2008). HPTLC of 6-gingerol and 3-acetyl-11-keto-beta-boswellic acid on silica gel with n-hexane - ethyl actate 7:3 in a chamber saturated at ambient temperature. Quantitative determination by absorbance measurement at 254 nm. The hRf values were 48 and 58 for 3-acetyl-11-keto-beta-boswellic acid and 6-gingerol respectively. The recovery was 98.7-100.8 % for both compounds. The chromatographic conditions were suitable for routine analysis.

J. Chinese Pharm. Standard 10 (4), 284-286 (2009). TLC of Naolibao pill extracts on silica with n-hexane - ethyl acetate 5:1. Qualitative identification by detection under UV 254 nm and 365 nm. The method is simple, rapid, reliable, and suitable for the quality control of the TCM formulation.

Research J. Pharm. and Tech. 3(2), 559-561 (2010). TLC on silica gel with toluene - acetonitrile - formic acid 50:50:3 with chamber saturation for 30 min. The hRf value was 27 for perindopril and 55 for losartan. Densitometric evaluation at 212 nm. The method was linear in the range of 5-30 µg/band and 1-10 µg/band for losartan and perindopril respectively. The average recovery was 98.2-99.9 %.

J. Trad. Chinese Veterinary Med. (5), 53-55 (2010). TLC on silica gel with acetone – ethanol – hydrochloric acid 10:6:1. Detection by spraying with bismuth potassium iodide – 1 % FeCl3 in ethanol 5:1 and heating at 100 ºC. Quantitative determination of stachydrine by absorbance measurement at 510 nm. The precision was 3.7 %RSD within plate (n=8), and the stability of the measurement within 120 minutes was 4.5 %RSD (n=5). The linearity range was 3.2-38.3 µg/zone (r=0.997, n=6) and standard addition recovery was 96.6 % (RSD=2.0 %, n=6).