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 .

J. AOAC Int. 91, 1162-1167 (2008). HPTLC of curcumin, demethoxycurcumin, and bisdemethoxycurcumin as standards on silica gel prewashed with methanol using chloroform - methanol 97:3 in a twin-trough chamber at 23 °C and 31 % relative humidity. Quantitative determination by absorbance measurement at 430 nm.

Asian J. Chem. 19(6), 4183-4187 (2007). HPTLC of atenolol and indapamide in tablet formulation on silica gel with toluene - ethanol - acetone - acetic acid 70:25:30:3. Quantitative determination by absorbance measurement at 266 nm. The hRf value of atenolol and indapamide was 21 and 74, respectively. The linearity range was 3.8-10.9 ng/spot and 0.2-0.6 ng/spot for atenolol and indapamide respectively. The recovery was in the range of 98.7-100.1 % for both compounds.

Chromatographia 68 (9-10), 877-880 (2008). TLC of betulinic acid in Nymphoides macrospermum on silica gel with hexane - ethyl acetate - acetic acid 700:300:3. Detection by spraying with anisaldehyde-sulphuric acid reagent. Quantification by absorbance measurement at 540 nm. Linearity was in the concentration range of 100–600 ng/spot. The method is suitable for the routine quality control of Granthika Tagara.

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(2), 1078-1084 (2006). TLC of nimesulide and diclofenac sodium on silica gel with n-hexane - ethyl acetate - chloroform - acetic acid 16:2:3:1. Quantitative determination by absorbance measurement at 256 nm. The hRf value of nimesulide was 3 and of diclofenac sodium 57. Linearity was between 1.0 and 3.2 µg/zone for nimesulide and 0.5 and 1.6 µg/zone for diclofenac sodium. The recoveries (by standard addition method) were in the range of 99.1 and 101.0 for both drugs. The proposed method is precise and accurate and can be used for routine analysis of nimesulide and diclofenac sodium capsule formulation.

J. Planar Chromatogr. 22, 97-100 (2009). TLC of (+)-catechin, (-)-epicatechin, (-)-epigallocatechin, (-)-epicatechin gallate, (-)-epigallocatechin gallate, theaflavin, theaflavin 3-gallate, theaflavin 3’-gallate, and theaflavin 3,3’-digallate on polyamide phase in a horizontal chamber (saturated for 15 min) by twofold development with chloroform - methanol 2:3 or n-butanol - acetone - acetic acid 5:5:3. Separation of the flavonols myricetin, quercetin, kaempferol, rutin and the phenolic acids gallic acid, chlorogenic acid, and caffeic acid was achieved by twofold development with chloroform - methanol 2:3. Detection by spraying with iron(III) chloride solution and evaluation under daylight. Quantitative determination by absorbance measurement at 600 nm.

J. Planar Chromatogr. 22, 43-47 (2009). HPTLC of alpha-solanine and alpha-chaconine on silica gel with dichloromethane - methanol - 2.5 % ammonia 175: 75:11 in a horizontal chamber saturated for 15 min. After drying and heating at 90 °C for 25 min detection by dipping twice in modified Carr-Price reagent (antimony(III) chloride in acetic acid - dichloromethane), followed by heating at 110 °C for 3 min. Quantitative determination by absorbance measurement at 560 nm. Linearity was between 30 and 700 ng. The limit of detection was 5-20 ng/zone depending on the sample matrix, the limit of quantification was 30 ng/zone. The ratio of alpha-chaconine and alpha-solanine was between 4:1 to 2:1 for all analyzed samples.