J. Chinese Herb Med. (Zhongcaoyao) 19, 344-345 (1988). TLC on silica with chloroform - methanol 19:2. Quantification by densitometry lS 265 nm and lR 365 nm. Study of the pharmacokinetics of sinomenine in rabbits.

Arzneim.-Forsch./Drug Res. 41, 392-398 (1991). TLC of nimodipine ((±)3-isopropyl 5-(2-methoxyethyl)1,4-dihydro-2,6-dimethyl-4-(3-nitrophenyl)-pyridine-3,5-dicarboxylate) and metabolites on silica with chloroform - methanol - water - acetic acid 65:28:4:4; 2D TLC using toluene - acetone - acetic acid 70:25:5 and toluene - acetone 1:1. Detection by autoradiography and scintillation.

J. Chinese Pharm. Univ. (Zhongguo Yaoke Daxue Xuebao) 26, 78-80 (1995). TLC of the permeating components at different times in the presence of azone in different concentrations. Detection by exposure to iodine vapors. Determination of tetrahydropalmatine before and after pernetration by spectrophotometry. Discussion of the effect of azone concentration added.

Arzneim.-Forsch./Drug Res. 48, 995-1006 (1998). TLC of metabolites of S-8921 (methyl 1-(3,4-dimethoxyphenyl)-3-(3-ethylvaleryl)-4-hydroxy-6,7,8-trimethoxy-2-naphthoate) on silica gel with benzene - dioxane - acetic acid 40:5:1 and on RP-18 with methanol - water - acetic acid 90:10:0.1. Detection of radioactive spots with an imaging plate and semiquantitative analysis using BAS 2000 (Fuji Film).

59th Indian Pharmaceutical congress F-146, 424, (2007). HPTLC of paracetamol, acetofenac and chlorzoxazone on silica gel with toluene - chloroform - methanol - ethyl acetate 6:2:2:1. Densitometric quantification at 225 nm. The hRf values of aceclofenac, paracetamoland chorzoxazole was 22, 42, and 73, respectively. Linearity was between 700-2400, 1000-3200, and 300-1000 ng/zone for aceclofenac, paracetamol and chorzoxazole, respectively. Recovery was between 100.5 and 101.5 % for all compounds.

Chromatographia 67 (5-6), 441-447 (2008). HPTLC of forskolinon on silica gel aluminium foil with benzene - methanol 9:1. Quantitative determination by densitometry in the absorbance mode at 545 nm after spraying with anisaldehyde sulphuric acid reagent. The method was validated: linearity was between 100 and 1000 ng/spot (r = 0.994) and the limits of detection and quantification were 8 and 27 ng/spot respectively. Application of the proposed method for determination of forskolin in Coleus forskohlii root and in capsule dosage forms, which showed 0.18 and 0.57 % w/w of forskolin, which was subjected to acid and alkali hydrolysis, oxidation, photodegradation and heat degradation. The method shows good repeatability, selectivity and accuracy, and effectively separates forskolin from components of C. forskohlii root, from excipients of capsule as well as the degradation products of forskolin. It can be used for routine analysis and as a stability-indicating method.

Anal. Chim. Acta, 572 (2), 237-242 (2006). Presentation of a stability-indicating method for simultaneous determination of the steroidal hormones levonorgestrel and ethinyloestradiol both in bulk drug and in low-dosage oral contraceptives by HPTLC on silica gel with hexane - chloroform - methanol 4:12:1. The hRf value of levonorgestrel was 65 and of ethinyloestradiol 43. The compounds were well separated from their degradation products. Quantitative determination by absorbance measurement at 225 nm. Linearity of levonorgestrel and ethinyloestradiol was 200–800 and 40–160 ng/spot, respectively.

J. Chromatogr. Sci. 48 (2), 109-113 (2010). HPTLC of nebivolol hydrochloride on silica gel with toluene – methanol - triethylamine 19:6:1. The hRf value of nebivolol hydrochloride was 33. Quantification by densitometry in the absorbance mode at 281 nm. Linearity was between 500 and 3000 ng/spot with r2= 0.9994. The limit of detection and quantification was 63 and 191 ng/spot, respectively. Nebivolol hydrochloride was subjected to acid and alkali hydrolysis, oxidation, thermal degradation, and photodegradation. The degradation products were well-resolved from the main component.