Indian J. Pharm. Sci. 69(4), 589 (2007). HPTLC of ropinirole on silica gel with methanol - acetone 4:1. Aripiprazole was used as internal standard. Under chromatographic conditions both ropinirole and aripiprazole were well separated. Evaluation under UV 254 nm. UV spectrometry was carried out at 250 nm.

J. Planar Chromatogr. 21, 113-117 (2008). HPTLC of alpha-solanine and alpha-chaconine on silica gel with chloroform - methanol - water - aqueous ammonia 140:60:10:1. Detection by dipping in cerium(IV) sulfate derivatization reagent. Quantitative determination by absorbance measurement at 505 nm.

Phytochem. Anal. 19, 244-250 (2007). HPTLC of taraxerol in Clitoria ternatea on silica gel with hexane - ethyl acetate 4:1. Detection by spraying with anisaldehyde reagent. Quantitative determination by absorbance measurement at 420 nm. The hRf value of taraxerol was 53 and selectivity regarding the matrix was given. Linearity was between 100 and 1200 ng of taraxerol. Recovery values were between 99.6 and 99.7 %. The limit of detection and quantification for taraxerol was 31 and 105 ng/spot, respectively.

J. Pharm. Biomed. Anal. 43 (3), 839-844 (2007). HPTLC of artemether both as a bulk drug and in pharmaceutical formulations on silica gel aluminum plates with toluene - ethyl acetate - formic acid 80:20:3. Quantification of artemether by densitometry at 565 nm. Linearity was between 200 and 1000 ng/spot. The limit of detection and quantification was 65 and 197 ng/spot, respectively. The method was successfully applied in the analysis of lipid based parenteral formulations and marketed oral solid dosage formulation.

fruits. Indian Drugs 45(11), 908-910 (2008). HPTLC of embelin in ethanolic extract of dried fruits of Embelia ribes Burm. on silica gel with ethyl acetate - methanol 9:1. Quantitative determination by absorbance measurement at 365 nm. The total content in Embelia ribes fruit was 0.034 %. The proposed HPTLC method provides a good resolution of embelin from other constituents present in the ethanolic extract of dried fruits of Embelia ribes Burm.

J. Chromatogr. A 1207 (1-2), 155-159 (2008). HPTLC of secoisolariciresinol diglucoside in flaxseed on RP18W with methanol - 0.1 % formic acid 2:3, using the alkaline hydrolysis in aqueous medium of undefatted samples. Quantitative determination by absorbance measurement at 282 nm. Validation of the method following the protocol proposed by the Société Francaise des Sciences et Techniques Pharmaceutiques lead to a dependable and high throughput procedure well suited for routine application. Linearity was between 321–1071 ng/zone and the RSD of repeatability and intermediate precision did not exceed 3.6 %.

J. Liq. Chromatogr. Relat. Technol. 31, 752-762 (2008). TLC and HPTLC of nine dipeptides (gly-gly, ala-gly, pro-leu, pro-asp, pro-gly, leu-pro, ala-pro, phe-pro, val-pro) on silica gel with ethanol - dichloromethane 2:1 and methanol - dichloromethane 1:1 in a horizontal chamber saturated for 20 min. Detection by spraying with sodium azide and starch solution (25 mL aqueous starch solution, containing 2.5 g starch, was added to 20 mL aqueous sodium azide solution containing 2 g sodium azide, the mixture was adjusted to pH 5.5 with 0.1 mol/L hydrochloric acid and diluted to 50 mL with water to obtain 4 % and 5 % solution for sodium azide and starch, respectively). All solutions were prepared fresh daily. The limit of detection was 2-200 pmol/spot for the iodine azide procedure, 1-100 pmol/spot for iodine, 20-2000 pmol/spot for UV 254 nm, and 40-1000 pmol/spot for spraying with ninhydrine and drying at 110 °C .

60th Indian Pharmaceutical Congress PA-201, (2008). HPTLC of clozapine on silica gel with toluene - acetonitrile - ethyl acetate - ammonia 80:20:1. The hRf value was 35. Quantitative determination by absorbance measurement at 290 nm. The drug when subjected to forced degradation (acid, alkali, thermal, photodegradation) was well separated from degraded products. The compound was found to be stable to oxidative conditions. The method was suitable for routine quality control of formulation.