J. Liq. Chromatogr. Relat. Technol. 31, 1871-1880 (2008). HPTLC for the determination of neutral lipid profils using a standard mixture (containing cholesterol, oleic acid, triolein, methyl oleate, cholesteryl oleate) on silica gel (plates with 19 scored lanes and a preadsorbent application area, prewashed by development with dichloromethane - methanol 1:1) with petroleum ether - diethyl ether - acetic acid 80:20:1 in a saturated twin-trough chamber. Detection by spraying with 5 % ethanolic phosphomolybdic acid and heating for 10 min at 115 °C. Quantitative determination by absorbance measurement at 610 nm.

Journal of Natural Remedies 8(1), 61-67 (2008). During pharmacognostic studies on Sphaeranthus indicus (Asteraceae) the sesquiterpenoid 7-OH-eudesmanolide was isolated. HPTLC of the ethyl acetate soluble fraction of aqueous alcoholic Sphaeranthus indicus extracts, on silica gel with n-hexane - diethyl ether 3:7. The plant extract and the marker (7-OH-eudesmanolide) were chromatographed simultaneously. Quantitative determination by absorbance measurement at 213 nm.

J. AOAC Int. 91, 1149-1153 (2008). HPTLC of berberine on silica gel prewashed with methanol using n-butanol - acetic acid - water 8:1:1 in a twin-trough chamber with chamber saturation for 5 min at 33 °C at 57 % relative humidity. Quantitative determination by absorbance measurement at 350 nm.

Indian Drugs 45(12), 948-951 (2008). HPTLC of nebivolol hydrochloride and hydrochlorothiazide on silica gel with ethyl acetate - methanol - ammonia 17:2:1. Absorbance measurement at 280 nm. The method was linear in the range of 500-1500 µg/mL and 100-500 µg/mL for nebivolol hydrochloride and hydrochlorothiazide respectively. Recovery was 99.3-101.9 % for both compounds. The method is suitable for routine quality control.

Indian Drugs 45 (7), 536 - 541 (2008). Chyawanprash contains many phytoconstituents, out of which gallic acid, catechin, epicatechin are considered to be responsible for the antioxidant activity and piperine is responsible for the bioavailability enhancing effect. HPTLC with toluene - ethyl acetate - formic acid - ethanol 60:40:3:4. Quantitative determination by absorbance measurement at 254 nm. The hRf values of epicatechin, catechin, gallic acid, and piperine were 13, 32, 44, and 82 respectively. Recovery was 99.0 % for epicatechin, 96.1 % for catechin, 102.5 % for gallic acid and 100.6 % for piperine in Chyawanprash. The results obtained were compared with similar formulations available in the market employing tests for identification and purity determination. The developed method may be considered as an additional tool for quality control of Chyawanprash.

J. Liq. Chromatogr. Relat. Technol. 31, 1204-1212 (2008). HPTLC of mirtazapine (1,2,3,4,10,14b-hexahydro-2-methyl-pyrazino[2,3-c][2-benzazepine]), and three impurities (2-(4-methyl-2-phenyl-piperazin-1-yl)nicotinic acid, [2-(4-methyl-2-phenyl-piperazinyl)-pyridin-3-yl]methanol, and 2-chloronicotinic acid on silica gel with toluene - acetone - methanol 6:2:2 with chamber saturation. Quantitative determination by absorbance measurement at 285 nm. The limit of detection and quantification for mirtazapine was 22 and 75 ng/spot, respectively.

Ind. J. Pharm. Sci. 69 (5), 689 - 686 (2007). A simple, fast precise and accurate HPTLC method has been developed for the simultaneous estimation of lansoprazole and domperidone in tablet formulations. This method allows the determination of 100-500 ng/spot of lansoprazole and 100-500 ng/spot of domperidone. HPTLC on silica gel with n-butanol - acetic acid - water 36:12:1:2. Quantitative determination by absorbance measurement at 288 nm. The hRf value of lansoprazole was 78 and of domperidone 21. The limit of detection and quantification for lansoprazole was 10 ng/spot and 40 ng/spot, and for domperidone 30 ng/spot and 65 ng/spot, respectivey. The method was suitable for routine quality control.

Anal. Chem. 77, 1207-1215 (2005). Desorption electrospray ionization (DESI) was demonstrated as a means to couple TLC with mass spectrometry. HPTLC of rhodamines on RP-2 and RP-8 with methanol - water 4:1 containing 200 mM ammonium acetate. HPTLC of FD&C dyes on RP-18 with water - acetone 7:3 containing 500 mM ammonium acetate. HPTLC of aspirin, acetaminophen and caffeine on silica gel with acetate - acetic acid 99:1. Tracks were scanned by moving the plate under computer control while directing the stationary DESI emitter charged droplet plume at the plate surface. Positioning of the DESI emitter, plate surface, and the atmospheric sampling orifice of the mass spectrometer were found to be crucial for obtaining maximum analyte signal levels. Desorption ionization from all TLC phases was not equivalent.