J. Pharm. Biomed. Anal 39, 132-138 (2005). A simple, selective, precise and stability-indicating HPTLC method of analysis of curcumin both as a bulk drug and in formulations was developed and validated. HPTLC on silica gel with chloroform-methanol 37:3. This system was found to give compact spots of curcumin (Rf 0.48). Densitometric analysis of curcumin in the absorbance mode at 430 nm. The linear regression analysis data for the calibration plots showed good linear relationship with r =0.996 and 0.994 via peak height and peak area, respectively, in the concentration range of 50-300 ng per spot. The method was validated for precision, recovery, robustness. The LOD and LOQ were 8 and 25 ng per spot, respectively. Curcumin was subjected to acid and alkali hydrolysis, oxidation and photodegradation.

Indian Drugs 42 (6), 345-352 (2005). TLC fingerprint identification of methanolic extracts of Adhatoda vasica, Lawsonia inermis and Alkanna tinctoria, on silica gel. For Lawsonia inermis and Alkanna tinctoria the developing solvent toluene - acetone - acetic acid 90:10:1 was used, and for Adhatoda vasica n-hexane - acetone - diethyl ether 3:1:1 for. Detection of alkannin by spraying with 10 % methanolic KOH.

Indian Drugs 42 (7), 424-427 (2005) HPTLC of fexofenadine HCl from tablet dosage form on silica gel with dichloromethane - methanol 13:7. Quantitative determination by absorbance measurement at 260 nm. The linear detector response was observed between 0.2 and 1.0 µg. The method was validated to determine its accuracy and precision. The LOD was found to be 0.08 ng/µL, LOQ was 0.02 ng/µL. The recovery was carried out by standard addition method and was found to be 100.82 %.

J. Sep. Sci. 26, 1359-1362 (2003). HPTLC of tramadol and chlorzoxazone (internal standard) on silica gel with ethyl acetate - methanol 7:1 and 1 drop of ammonia. Quantitative determination by absorbance measurement at 275 nm. Linearity of determination of levofloxacin is between 1.0 and 2.5 µg and its average percentage recovery is 104.6 %.

Indian Drugs 44(1), 43-47 (2007). HPTLC of beta-sitosterol in methanolic extracts of powdered Cynodon dactylon (Linn.) Pers., on silica gel with chloroform - toulene 19:1. Detection with Libermann-Burchard reagent. Quantitative determination by densitometry at 366 nm. Beta-sitosterol response was linear over the range of 40 µg/mL to 90 µg/mL. The amount of beta-sitosterol in the whole plant powder of Canodon dactylon (Linn.) Pers was found to be 0.60 mg. The validated HPTLC method can be used for routine quality control of Cynodon dactylon (Linn.) Pers. whole plant powder and quantification of beta-sitosterol.

Indian J. Pharm. Sci. 68 (6), 790-793 (2007). HPTLC of carvedilol in bulk drug and pharmaceutical formulations, on silica gel with ethyl acetate - toluene - methanol 2:8:7. Quantitative absorbance measurement at 242 nm. The hRf value of carvedilol was 65. The method was found to be linear over the concentration range of 50-300 ng/spot with recovery of 98.3-101.1%.The method was validated for accuracy and precision. Comparison with an HPLC method showed the HPTLC method to be advantageous regarding sample throughput.

Pharmazie 60, 110-114 (2005). TLC of two glyceride derivatives of mefenamic acid (“3a and 3b“) on silica gel with hexane - ethyl acetate 5:1. Detection by exposure to iodine vapors.

J. Planar Chromatogr. 20, 293-301 (2007). TLC of candesartan, eprosartan, losartan, telmisartan, and valsartan on silica gel, aluminum oxide, amino-, cyano-, and diol-phase in a horizontal chamber in sandwich technique. Diol-phases were developed with hexane - isopropanol - formic acid 40:60:1, cyano-phases with hexane - dioxane - formic acid 30:70:1. Detection and quantification at 254 nm.