J. Liq. Chromatogr. Relat. Technol. 33, 179-190 (2010). TLC of salicylic acid and its derivatives, namely acetylsalicylic acid, salicylanilide, salicylaldehyde, salicylamide, salicylhydroxamic acid, methyl salicylate, phenyl salicylate, 3,5-dinitrosalicylic acid, 2,5-dihydroxysalicylic acid, 3-aminosalicylic acid, 4-aminosalicylic acid, and 5-aminosalicylic acid, on RP8, RP18 and HPTLC on RP18 and cyano phase with methanol - water; the content of methanol in mobile phase was gradually varied by 5 % from 20-100 %. Development in a chamber saturated for 15 min. Quantitative determination by scanning densitometry in absorption mode at the respective absorption maximum. The hRf values were recalculated on the RM values. The chromatograms were repeated in triplicate and mean hRf values were calculated. The results indicate that the chromatographic parameter of lipophilicity determined on RP8 and cyano phase may be used as a measure of lipophilicity of the investigated salicylic acid and its derivatives.

Phytochem. Anal. 21, 174-179 (2010). HPTLC of tiliroside (1), methyl brevifolincarboxylate (2), and ellagic acid (3) in the aerial parts of Potentilla species on silica gel with toluene - ethyl formate - formic acid 6:4:1. Quantitative determination by absorbance measurement at 320 nm for (1), 287 nm for (2), and 280 nm for (3). The hRf values of (1), (2) and (3) were 9, 13, and 20, respectively. Linearity was between 50 and 500 ng/zone for (1), 50 and 520 ng/zone for (2), and 52 and 500 ng/zone for (3). The intra- and inter-day precisions (expressed in terms of CV %) were observed in the ranges 2.5-9.0 % and 2.4-11.1 %, respectively. LOD for (1) to (3) were 5, 10 and 34 ng/zone, respectively, while LOQ were 27, 17 and 44 ng/zone, respectively. The average recovery of (1), (2) and (3) was 101.1, 82.2 and 94.0 %, respectively.

Analytical Methods 2, 521-531 (2010). An HPTLC method for determination for paliperidone in formulation as well as for in vitro release studies has been developed. HPTLC on silica gel with methanol - ethyl acetate 4:1. The hRf value was 54. Quantification was performed by densitometric evaluation at 254 nm. The method was linear in the range of 100-600 ng/band. The method was suitable for estimation of the drug in mucoadhesive microemulsion formulations, as well as for solubility and diffusion studies.

Indian Drugs 47(6), 59-61 (2010). HPTLC of gallic acid in bark powder of Terminalia crenulata (Combretaceae) on silica gel with toluene - ethyl acetate - formic acid - methanol 60:60:16:4 with chamber saturation for 30 min. Densitometric evaluation at 254 nm. The method was linear in the range of 200-1200 ng/band. Samples extracted with different solvents were compared. Both alcoholic and water extracts were found to contain gallic acid where as it was absent in the chloroform extract.

Journal of Pharmacy Research 2(5), 975-977 (2009). Quantitative analysis of jatamansone in jatamansi oil obtained by steam distillation of rhizome extracts of Nardostachys jatamansi (Valerianaceae). HPTLC on silica gel with petroleum ether - acetone 3:1 in a saturated twin trough chamber. The hRf value of jatamansone was 43. Densitometric evaluation at 285 nm. The method was linear in the range of 250-1500 ng/band. The recovery was 98.8-102.2 %. The oil was found to contain 20.3 % of jatamansone.

International Journal of Green Pharmacy 3 (1), 47-17 (2009). HPTLC of caffeine on silica gel with ethyl acetate - methanol 9:1. Densitometric quantification at 274 nm. The method was linear in the range of 2-14 µg/band. The sample extracted with 5 % diethyl amine in water gave the maximum yield of caffeine (2.1 %). The proposed chromatography gave the best resolution with caffeine at an hRf value of 40. The method can be used for quality control of tea samples in respect of caffeine contents.

Indian Drugs 47(6), 31-38 (2010). Pods of Prosopis were extracted with different solvents and the extracts were subjected to phytochemical evaluation using 2D paper chromatography and HPTLC. Analysis of phenolic acids by two-directional paper chromatography with toluene - acetic acid - water 6:7:3 in the first direction and sodium formate - formic acid - water 10:1:200 in the second direction. For detection of phytoconstituents HPTLC on silica gel with different mobile phases and detection wavelengths: 1) beta-sitosterol with toluene - methanol 9:1, measured at 258 nm, 2) coumaric acid with toluene - ethanol 4:1, measured at 292 nm, 3) quercetin with toluene - methanol 4:1, measured at 271 nm, and 4) caffeine with toluene - acetone 7:3, measured at 272 nm.

Eur. J. Med. Chem. 45, 3719-3725 (2010). HPTLC of sulpiride and mebeverine on silica gel with ethanol - methylene chloride - triethyl amine 35:15:1. Quantitative determination by absorbance measurement at 221 nm. The hRF of sulpiride and mebeverine was 42 and 62, respectively. Linearity was between 0.4-1.4 µg/band for sulpiride and 0.2-1.6 µg/band for mebeverine. Detection and quantification limits were 0.02 and 0.3 µg/band for sulpiride and 0.04 and 0.2 µg/band for mebeverine. The intra-day and inter-day precisions had a %RSD lower than 2.6 %.Recoveries (by standard addition) were 99.3 % and 100.7 % for sulpiride and mebeverine, respectively. The proposed method showed comparable statistical results with the standard HPLC method