J. AOAC Int. 91, 1331-1338 (2008). HPTLC of ciprofloxacin (1-cyclopropyl-6-fluoro-1,4-dihydro-4-oxo-7-(piperazin-1-yl)quinoline-3-carboxylic acid hydrochloride) and degradation products (7-[(2-aminoethyl)amino]-1-cyclopropyl-6-fluoro-1,4-dihydro-4-oxo-quinoline-3-carboxylic acid and 7-amino-1-cyclopropyl-6-fluoro-1,4-dihydro-4-oxo-quinoline-3-carboxylic acid) on silica gel with chloroform - methanol - 25 % ammonia 43:43:14. Detection with 0.3 % methanolic ninhydrin solution and dimethylaminobenzaldehyde and quantitative determination by absorbance measurement at 277 nm.

60th Indian Pharmaceutical Congress PA-204, (2008). HPTLC of carvedilol on silica gel with methanol - ethyl acetate 13:7. The hRF was 49. Quantitative determination by absorbance measurement at 242 nm. Linearity was between 200-1000 ng/spot. The recovery was 98-102 %. The method was suitable for routine quality control of the drug in formulation.

60th Indian Pharmaceutical Congress PA-08, (2008). HPTLC of ofloxacin and ornidazole on silica gel with chloroform - methanol - toluene - diethyl amine - water 20:15:25:10:1 in a saturated (20 min) twin trough chamber. Densitometric evaluation at 304 nm. The method was linear in the range of 20-250 ng/µL for both compounds. Recovery was between 100.6 and 101.2 %. The method is suitable for routine quality control.

Ind. J. Pharm. Sci. 69 (6), 834-836 (2007). HPTLC of olmesartan medoxomil and hydrochlorothiazide on silica gel with acetonitrile - chloroform - acetic acid 14:4:1. Quantitative determination by absorbance measurement at 254 nm. The calibration curve was linear between 500 and 750 ng/spot for olmesartan medoxomil and between 100 and 600 ng/spot for hydrochlorothiazide. The limit of detection and quantification for olmesartan medoxomil was 170 and 500 ng/spot, and for hydrochlorothiazide 30 and 100 ng/spot. The proposed method can be successfully used to determine the drug content of marketed tablet formulation.

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.

J. Chinese Trad. Patent Med. 30 (12), 1997-1800 (2008). TLC of Hongjinchan granule extracts on silica gel with 1) n-butanol - glacial acetic acid - water 7:1:2; and 2) chloroform - ethyl acetate 7:3. Detection 1) under UV 365 nm; 2) by spraying with 2 % iron(III) chloride in ethanol; 3) by exposure to ammonia vapor for approx. 15 min. Identification by comparison with the standards of the component drugs. Quantification of scutellarin by HPLC.

J. Planar Chromatogr. 21, 267-270 (2008). HPTLC of pitavastatin calcium on silica gel (prewashed with methanol) in a twin trough chamber saturated for 30 min at room temperature with toluene - methanol - glacial acetic acid 190:59:1. Quantitative determination by absorbance measurement at 238 nm. The limits of detection and quantification were 7 and 20 ng/band, respectively.

Anal. Chim. Acta 598 (2), 312-317 (2007). TLC of paroxetine hydrochloride on silica gel with butanol - acetic acid - water 16:4:1. The hRf value of paroxetine HCl was 48 and separation from the degradation products (produced by acid and alkali hydrolysis, oxidation and photodegradation) was good. Quantitative determination by absorbance measurement at 295 nm. The linearity was in the range of 300 - 1500 ng/spot and the correlation coefficient was 0.9903. The limit of detection and quantitation was 50 and 150 ng/zone, respectively.