Phytochem. Anal. 20, 421-426 (2009). HPTLC of delta-9-tetrahydrocannabinol in the flowertops of Cannabis sativa on silica gel with chloroform with chamber saturation for 20 min. Quantitative determination by absorbance measurement at 206 nm. Derivatization by dipping in Fast Blue B solution for 5 s. The hRf value of delta-9-tetrahydrocannabinol was 47 and selectivity regarding matrix was given. Linearity was given between 50 and 500 ng/zone. The limit of quantification and detection was 50 and 10 ng/zone, respectively. The intra- and inter-day repeatability (%RSD, n = 9) were not higher than 5.0 %. Recovery was 85.8 % for delta-9-tetrahydrocannabinol in decarboxylated Cannabis samples. The method was shown to be comparable within a small degree of error (0.5 %) to results from a validated HPLC method.

Ind. J. Pharma. Sci. 71(1), 95-97 (2009). HPTLC of emtricitabine and tenofovir on silica gel with chloroform - methanol 9:1. Quantitative determination by absorbance measurement at 265 nm. The calibration curve was linear between 200 and 1000 ng with a regression coefficient of 0.9995.

Abstract No. F-244, 61st IPC (2009). HPTLC of rabeprazole and itopride on silica gel with ethyl acetate - methanol - benzene - chloroform 2:4:3:1. The hRf value was 42 and 61 for rabeprazole and itopride, respectively. Quantitative determination by absorbance measurement at 276 nm. The method was linear in the range of 200-300 ng/band for rabeprazole and 1500-2250 ng/band for itopride.

Abstract No. F-315, 61st IPC (2009). HPTLC for pravastatin on silica gel with ethyl acetate - toluene - acetonitrile - formic acid 60:35:5:2. Quantitative determination by absorbance measurement at 237 nm. The method was linear in the range of 318-3816 ng/band. Recovery was 99.9-101.2 %. Stability tests showed that degradation products resulting under acid stress conditions were well resolved from the main component.

Abstract No. F-235, 61st IPC (2009). HPTLC of olanzapine on silica gel with methanol - ethyl acetate 4:1. The hRf value was 35. Quantitative determination by absorbance measurement at 285 nm. The method was linear in the range of 100-600 ng/band. The method was suitable for analysis of formulations and in-house prepared mucoadhesive microemulsions.

60th Indian Pharmaceutical Congress PG-264 (2008). HPTLC of quercetin in acetone extracts of Psidium guajava leaves on silica gel with toluene - acetone - formic acid 38:10:5. Quantitative determination of quercetin by absorbance measurement at 364 nm. The correlation coefficient was 0.9847. There was a good correlation between peak area and corresponding concentration of quercetin. The proposed HPTLC method provided a good resolution of quercetin from other constituents present in acetone extract of tender leaves of Psidium guajava and can be used for the quantification of quercetin.

60th Indian Pharmaceutical Congress PA-223 (2008). HPTLC of curcumin, demethoxycurcumin and bis-demethoxycurcumin on silica gel with chloroform - methanol 19:1. The hRf values were 25, 38, and 61 for bis-demethoxycurcumin, demethoxycurcumin, and curcumin respectively. Quantitative determination by absorbance measurement at 420 nm. The method was linear in the range of 50-400 ng/spot (curcumin), 10-150 ng/spot (demethoxycurcumin), and 5-40 ng/spot (bis-demethoxycurcumin). Recovery was in the range of 99.2-100.5 % for all three compounds.

60th Indian Pharmaceutical Congress PG-349 (2008). HPTLC of 3H-4M-benzaldehyde (in crude plant material, extracts and dosage form of Hemidesmus indicus) on silica gel with toluene - ethyl acetate - methanol - acetic acid 15:3:1:1. Quantitative determination by absorbance measurement at 230 nm.