J. Liq. Chrom. & Rel. Technol. 27, 2201-2215 (2004). TLC of pentacyclic triterpene acids (asiatic acid, madecassic acid) and triterpene glycosides (asiaticoside, madecassoside) on silica gel with ethyl acetate - methanol - water 8:2:1. Detection of triterpenoids by spraying with 3 % sulfuric acid in ethanol, followed by heating to 110 °C for 5 min on a hot plate.

J. Chinese Trad. Patent Med. (Zhongchengyao) 27 (7), 786-790 (2005). TLC of Hainan holly on silica gel with 1) ethyl acetate - butanone - formic acid - water 5:3:1:1; 2) ethyl acetate - formic acid - water 14:5:5; 3) benzene - acetone - methanol - formic acid 85:15:10:2. Detection 1) by spraying with 1 % AlCl3 solution; 2) under UV 365 nm; 3) by spraying with 5 % phosphomolybdic acid in ethanol followed by heating at 105 ºC until the spots are visualized. Identification by fingerprint techniques. Quantification of rutin by HPLC. Discussion of the optimum processing procedure by comparison of TLC fingerprints and HPLC results of rutin content.

Planta Med. 72, 132-135 (2006). Analytical and preparative TLC of aframolin B (8beta(17)-epoxy-15,15-dimethoxylabd-12(E)-en-16-al), and aframodial on silica gel with hexane - ethyl acetate 2:3. Detection under UV light at 254 nm.

Indian Drugs 42 (7), 465-468 (2005). HPTLC of tizanidine and diclofenac in tablet formulations on silica gel with chloroform - methanol 4:1. Quantitative determination by absorbance measurement at 230 nm. Cetrizine was used as an internal standard. The solvent system was found to give compact spots for diclofenac sodium (Rf value 0.86), tizanidine (0.26) and cetrizine (0.52). The method was validated for linearity, accuracy and precision. Linearity for tizanidine was 0.6-1.4 µg/mL, and for diclofenac sodium 7.5-17.5 µg/mL . The mean recoveries obtained for tizanidine and diclofenac sodium were 98.73 % and 99.70 %, respectively. The proposed method was accurate, precise, selective and rapid for simultaneous estimation of tizanidine and diclofenac sodium in tablets.

J. Planar Chromatogr. 19, 241-245 (2006). TLC of the enantiomers of the beta-blockers (+/-)-propanolol, (+/-)-metoprolol, and (+/-)-atenolol on silica gel impregnated with a Cu(II)-L-arginine complex in a glass chamber saturated for 20-25 min using different mixtures of acetonitrile, methanol, and water as mobile phases. Impregnated TLC plates were prepared by spreading a slurry of 50 g silica gel in a solution of 100 mL of the Cu(II)-L-arginine complex and activating the plates overnight at 60 °C. The Cu(II)-L-arginine complex was prepared by mixing 1 mM copper(II) acetate and 2 mM L-arginine in water - methanol 9:1 and adjusting the final pH to 6-7 with aqueous ammonia. Detection with iodine vapor. Successful separation of all three racemic drugs was achieved with acetonitrile - methanol - water 15:2:2 and 15:2:1.

Ital. J. Food Sci. 18, 287-294 (2006). The ratio of alpha-solanine to alpha-chaconine of tuber sprouts was determined by TLC on silica gel with methanol – chloroform – 1 % aqueous ammonium hydroxide 2:2:1. For quantitative determination zones were isolated from the plate, extracted with 2 % aqueous acetic acid, and measured spectrophotometrically at 420 nm with methyl orange.

C. Cheng by thin-layer chromatography) (Chinese). Chinese J. Pharm. Anal. (Yaowu Fenxi Zazhi) 25 (6), 719- 721 (2005). TLC of fulvotomentoside A on silica gel with chloroform - methanol - water 61:32:5. Detection by spraying with 10 % H2SO4 in ethanol followed by heating at 105 ºC for 5 min. Quantitative determination by densitometry at 518 nm. The procedure was validated regarding linearity range (1.20 - 7.20 µg/spot, r = 0.998), repeatability (0.51 %, n = 5), precision (0.21 %, n = 5 within plate and 0.87 % n= 5 plate-to-plate), and recovery (99.7 %, RSD = 2.45 %, n = 5). The results are given for three batches of real life samples.

Acta Chrom. 11, 183-195 (2001) TLC method for selective separation of Au3+ and Ag+ from accompanying metal ions (Cr6+, Ni2+, Cu2+, Zn2+, Cd2+, and Hg2+). TLC of Au3+ on silica gel G with aqueous 1.2 mM N-cetyl-N,N,N-trimethylammonium bromide and of Ag+ on alumina G layers with 2.5 M aqueous ammonium sulphate. Detection of Au3+ by spraying with 5 % aqueous stannous chloride, of Ag+, Cd2+, and Hg2+ by spraying with yellow ammonium sulphide, and of Cu2+ by spraying with 1 % aqueous potassium ferrocyanide. Ni2+ was detected by spraying with 1 % ethanolic dimethylglyoxime, Cr6+ by spraying with saturated ammonium thiocyanate in acetone, and Zn2+ by spraying with 0.05 % dithizone in CCl4. TLC in combination with spectrophotometry and volumetric analysis was used to determine content of Au3+ and Ag+ in secondary materials.