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 PA-231 (2008). HPTLC of voriconazole on silica gel with toluene - ethyl acetate 1:3. Quantitative determination by absorbance measurement at 255 nm. The linearity range was 10-1200 ng/spot, recovery was 99.5 %. The method was suitable for routine quality control of formulations.

J. Planar Chromatogr. 22, 421-424 (2009). TLC of domperidone and paracetamol on silica gel with acetone - toluene - methanol 2:2:1 in a twin trough chamber saturated for 30 min at room temperature. Quantitative determination by absorbance measurement at 285 nm for domperidone and at 248 nm for paracetamol.

J. AOAC Int. 93, 556-561 (2010). TLC of methamphetamine (MA), 3,4-methylenedioxymethamphetamine (MDMA), and 3,4-methylenedioxy-N-ethylamphetamine (MDEA) on silica gel with hexane - chloroform 1:9 and HPTLC on cyano phase with benzene - diethyl ether - petroleum ether (40-60 °) - acetonitrile - ethyl methyl ketone 4:7:7:1:1 with chamber saturation for 30 min. The hRf value of MA, MDMA, and MDAE on silica gel were 28, 23, and 36, repectively, and on cyano phase 35, 30, and 40, respectively. LOD on silica gel were 0.8, 0.6, and 1.2 µg/mL (in plasma) for MA, MDMA, and MDEA respectively.

J. Planar Chromatogr. 23, 420-425 (2010). TLC and pressurized planar electrochromatography (PPEC) of acetylsalicylic acid, caffeine, and acetaminophen on RP-18 and RP-18 W (prewashed with methanol) using acetonitrile - buffer - water ( e. g. 15 % acetonitrile in pH 3.8 buffer) in a horizontal chamber saturated for 15 min. Evaluation by densitometry. The results showed that PPEC of these drugs is characterized by faster separation, better performance, and different separation selectivity. The technique is still under development, however, rather slow because a variety of technical challenges must be overcome.

J. Liq. Chromatogr. Relat. Technol. 34, 805-816 (2011). HPTLC of methyl (1), ethyl (2), propyl (3), and butylparaben (4) on RP-18 first with methanol 60 % and in a second development with methanol 30 %. Quantitative determination by absorbance measurement at 254 nm. The hRf values of parabens (1) - (4) were 57, 47, 37 and 28, respectively. Linearity was between 0.46-2.74 µg/band for (1), 0.50-2.99 µg/band for (2), 0.54-3.24 µg/band for (3) and 0.58-3.49 µg/band for (4). The LOD and LOQ were between 100-370 ng/zone and 200-440 ng/zone, respectively. Relative standard deviation of precision was below 3.5 %. Recovery (by standard addition) was higher than 96.3 % in all cases.

J. Planar Chromatogr. 24, 48-52 (2011). HPTLC of hydroquinone on silica gel with chloroform - methanol 17:3 in a twin-trough chamber after saturation for 30 min at 25 °C. Quantitative determination by densitometry in absorbance mode at 289 nm. The hRf of hydroquinone was 51. Linearity was between 100 and 2500 ng/zone. Mean recovery was 99.2 %, with %RSD between 1.7-2.0 %. The intra-day precision (n = 3) as %RSD was 0.9-1.1 % and the inter-day precision 1.0-1.2 %. The LOD and LOQ was 39 and 116 ng/band, respectively.

J. Planar Chromatogr. 24, 337-343 (2011). TLC of tenoxicam and pyridine-2-amine on silica gel with ethyl acetate - toluene - butylamine 2:2:1 with chamber saturation for 15 min at room temperature. Quantitative determination by absorbance measurement at 288 nm. The hRf value was 52 and 64 for tenoxicam and pyridine-2-amine, respectively. Linearity was between 35-1820 mg/mL for tenoxicam and 10-500 mg/mL for pyridine-2-amine. LOD and LOQ were 0.9 and 2.6 mg/band for tenoxicam and 0.1 and 0.3 mg/band for pyridine-2-amine. The recovery was 99.0-99.9 % for tenoxicam and pyridine-2-amine. The %RSD did not exceed 1 % at any level.