J. Liq. Chrom. & Rel. Technol. 21, 741-753 (1998). TLC of lobeline, khellin and emetine hydrochloride on silica gel with methanol - ammonia 200:3 for lobeline and emetine and with ethyl acetate for khellin. Quantitation by densitometry at 285, 250 and 239 nm, respectively. Mean percentage accuracies were 99.34%, 99.99% and 99.96% for lobeline, khellin and emetine, respectively. New simple, rapid, precise TLC procedure.

Planta med. 65, 161-162 (1999). Analytical and preparative TLC of b-phenethylamine the new alkaloid and 2-b-methyl-3-b-hydroxy-6-b-piperidinedodecanol on silica gel with chloroform - methanol 9:1+ 1% NH3. Detection with Dragendorff reagent.

Planta med. 66, 251-256 (2000). Analytical and preparative TLC of (-)-5'-methoxypodorhizol, b-sitostenone, stigmasta-4,22-dien-3-one, N-(N-methylcarbamoyl)-O-methylbulbocapnine, 6a-hydroxystigmast-4-en-3-one, 6a-hydroxystigmasta-4,22-dien-3-one on silica gel with chloroform - acetone 10:1, hexane - ethyl acetate 7:1, dichloromethane - acetone 10:1 and dichloromethane - methanol 15:1. Detection under UV 254 nm.

Proc. Intern. Symp. on Planar Separations Plan. Chrom. 385-392 (2003). HPTLC of alkaloids (yohimbine, boldine, novocain, quinine, colchicin, brucine, strychnine, theobromine, narcotine, glaucine, caffeine, protopine) on RP-18 in horizontal chambers after pre-conditioning for 20 min with e.g. binary mixtures of organic modifier, methanol, acetonitrile, or tetrahydrofuran, isopropanol, dioxane with buffered water. Visualization under UV 254 nm. Densitometry at 254 nm. The incorporation of amine to the aqueous mobile phase gives the best results for the separation of alkaloids investigated; the peaks are narrow, in most cases symmetric, and the selectivity of separation is improved.

J. Chinese Trad. Patent Med. (Zhongchengyao) 25 (7), 526-529 (2004). TLC on silica gel with benzene - ethyl acetate - methanol - isopropanol - conc. ammonia 20:10:5:5:1. Detection of berberine chloride under UV 365 nm. Identification by standard comparison. Quantification by densitometry at 342 nm. GC of volatile oil and HPLC of cinnamyl aldehyde. Discussion of the optimization of the extraction methods of combined ingredients of the medicine.

J. Planar Chromatogr.19 , 282-287 (2006). HPTLC of ajmaline, ajmalicine, and reserpine on silica gel, prewashed with methanol, in an unsaturated twin-trough chamber with toluene - methanol 19:6. Detection by dipping in Dragendorff’s reagent. Quantitative determination by absorbance measurement at 520 nm.

Asian J. Chem. 20(8), 6007- 6010 (2008). HPTLC of piperine as bulk drug and in formulations on silica gel with toluene - ethylacetate 93:9. Quantitative determination by absorbance measurement at 254 nm. The method was linear in the range of 100-400 ng/µL. The sample was then subjected to degradation studies (acid, alkali, oxidation, photodegradation). The method could effectively separate the drug from degradation products thus being stability indicating.

Anal. Chim. Acta 633 (2) 188-196 (2009). HPTLC of lycorine and galanthamine from Narcissus jonquilla ‘Pipit’ on silica gel with chloroform - methanol - 25 % ammonia 18:1:1. Quantitative evaluation by absorbance measurement at 207 nm. The correlation coefficients were r=0.9882 and 0.9908, respectively, for the mean values of galanthamine and lycorine. Investigation of different extraction solvents showed that extraction with methanol and 1 % tartaric acid in methanol at default conditions (120 °C, p = 60 bar, time: 10 min, one static cycle) provide the highest yields of total alkaloids, whereas for toluene the lowest amounts were measured. Lycorine to galanthamine mean ratios were dependant on the type of solvent used, and in toluene galanthamine and related alkaloids were preferably extracted.