60th Indian Pharmaceutical Congress PA-82, (2008). HPTLC of wedelolactone in supercritical fluid extrats of Eclipta alba Hassk. on silica gel with toluene - ethyl acetate - formic acid 50:50:1. Densitometric evaluation at 240 nm. The method is linear in the range of 100-1000 ng/spot. The method was used for estimation of wedelolactone in the raw material obtain from different regions of the country (India).

60th Indian Pharmaceutical Congress PA-207, (2008). HPTLC of glibenclamide, rosiglitazone and metformin in combined dosage form on silica gel with methanol - tetrahydrofuran - water - acetate acid 40:9:10:1 with chamber saturation for 10 min. ThehRF values were 56, 60, and 80 for glibenclamide, rosiglitazone, and metformin respectively. Quantitative determination by absorbance measurement at 245 nm. The method was linear in the range of 200-1000 ng/zone (glibenclamide, rosiglitazone) and 120-600 ng/zone (metformin). Recovery was 0.97-99.3 % for all the three compounds. The method was suitable for simultaneous estimation of all three compounds in dosage form.

Ind. J. Pharm. Sci. 70(2), 251-255 (2008). HPTLC of olanzapine and fluoxetine on silica gel with methanol - toluene 2:1. Quantitative determination by absorbance measurement at 233 nm. The method was linear in the range of 100-800 ng/spot for olanzapine and 1000-1200 ng/spot for fluoxetine. Recovery was 99.4-100.4 % for both compounds. Forced degradation studies (acid, base, oxidation, photolyses and thermal) revealed that all the degradation products were well resolved from the principal compound. The method was suitable for routine quality control.

Asian J. Chem. 18(4), 2669-2672 (2006). TLC of lamivudine and zidovudine on silica gel with toluene - methanol - n-hexane 14:3:2. Quantitative determination by absorbance measurement at 275 nm. Linearity for lamivudine and zidovudine was in the range of 0.8-2.0 and 1.5-4.0 µg/zone, respectively. The average recovery was 99.4 - 100.3 % for both drugs. The method can be applied for routine simultaneous estimation in combined dosage form.

Phytochem. Anal. 20, 253-255 (2009). HPTLC of saponins in the tea seed meal of Camellia oleifera on silica gel with ethyl acetate – methanol – water 4:2:1. Quantitative determination by absorbance measurement at 214 nm. The hRf value of tea saponin was 40 and selectivity regarding matrix was given. The correlation coefficient was 0.9978 and the relative standard deviation 1.6 %. Linearity was between 0.9 and 22.2 µg/spot. The limit of detection and quantification was 870 ng and 2900 ng/spot, respectively.

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. Planar Chromatogr. 21, 277-282 (2008). TLC of clotrimazole and metronidazole on silica gel in a twin trough chamber saturated for 10 min with toluene - ethyl acetate - methanol - acetic acid 55:2:6:1. Quantitative determination by absorbance measurement at 220 nm.

Indian J. Pharma. Sci. 70(6), 831-834 (2008). HPTLC of sumatriptan on silica gel (pre-washed) with methanol - water - glacial acetic acid 40:80:1 with chamber saturation for 10 min. Quantitative determination by absorbance measurement at 230 nm. The hRf value was 64. The method was linear in the range of 200-800 ng/spot.