J. Planar Chromatogr. 23, 129-133 (2010). TLC of glicazide and glipizide on RP18 silica gel with 60 % acetonitrile in pH 2.3 phosphate buffer in an unsaturated horizontal chambers at room temperature. Detection and quantitative determination by absorbance measurement at 215 nm. Linearity was in the range of 0.8-1.8 µg/zone for both drugs and the correlation coefficients r were 0.998 for gliazide (hRf 38) and 0.993 for glipizide (hRf 51). LOD and LOQ were 50 and 200 ng/zone, respectively, for glicazide and 60 and 300 ng/zone for glipizide.

Phytochem. Anal. 21, 219-223 (2010). HPTLC of safranal in saffron extract and in a safranal-loaded nanoparticle formulation on silica gel with n-hexane - ethyl acetate 9:1. Quantitative determination by absorbance measurement at 310 nm. The hRf of safranal was 51. Linearity was between 0.5 and 5.0 µg/zone. The intra-day and inter-day precisions were 1.08-2.17 and 1.86-3.47 %, respectively. LOD was 50 ng/zone while LOQ was 150 ng/zone. The average recovery was 99.9 %. The proposed method provides significant advantages in terms of greater specificity and rapid analysis.

J. Liq. Chromatogr. Relat. Technol. 33, 423-430 (2010). HPTLC of olmesartan and zidovidine on silica gel with ethyl acetate - methanol - acetic acid 160:40:1 in a twin-trough chamber saturated for 10 min. Quantitative determination by densitometric scanning at 269 nm. The linearity range was 80-600 ng/zone. LOQ was 80 ng/zone, the correlation coefficient 0.9900 and 0.9820. Recovery was 90.1 and 79.6 %. The accuracy and precision of the method were determined by repeatability (intra-day) and intermediate precision (inter-day) for the set of quality control samples (low, mid, high) in replicate. The results revealed excellent intra- and inter-day accuracy and precision of the method, which was within the acceptable limit (accuracy (% RE) 11.89 and 6.76 (low), 2.53 and 3.83 (mid), and 0.65 and 7.14 (high); inter-day precision (CV): 3.29 and 3.00 (low), 1.02 and 1.51 (mid), and 1.11 and 0.69 (high); intra-day precision: 2.59 and 2.86 (low), 1.07 and 1.13 (mid), and 1.04 and 0.72 (high) - after LLE and SPE, respectively).

Rapid Commun. Mass Spectrom. 24, 1721-1729 (2010). Ambient proximal probe thermal desorption (TD) sampling of substances from a HPTLC plate and coupled with secondary ionization by atmospheric pressure chemical ionization (APCI) or electrospray ionization (ESI). The method does not require a specialized ionization source. Different anaytical parameters and performance metrics are reported and the method covers a wide range of analyte types including explosives, dyestuffs, herbicides and pharmaceuticals.

as a leading compound for quantification in raw material and finished product. J. Liq. Chromatogr. Relat. Technol. 33, 996-1004 (2010). TLC of xylose with acetonitrile - water 9:1 with chamber saturation at ambient temperature. Detection by dipping into 4-aminobenzoic acid reagent for 1 to 2 s followed by heating at 110 °C for 10 min. The hRf of xylose was 56. Quantitative determination by densitometric evaluation at 366 nm. The linearity determination coefficient was r2 = 0.9999. The recovery of xylose was between 102 and 106 %. The precision of a six-time preparation was 1.6 %.

J. Liq. Chromatogr. Relat. Technol. 33, 1013-1027 (2010). Preparative TLC of triacylglyerol (TAG) fractions on silica gel with hexane - acetone 25:4. Analytical TLC of TAG classes from sunflower, corn, soybean, cotton, and olive oil (differing in saturation) on silica gel, impregnated by dipping into a 5 % methanolic solution of silver nitrate, with petroleum ether - acetone - ethyl acetate 100:3:2 and 50:3:2. Detection by exposure to bromine and sulfuryl chloride vapor and heating at 180-200 °C . Quantitative determination by absorbance measurement at 450 nm.

Indian Drugs 47(11), 68-72 (2010). TLC on silica gel with ethyl acetate - acetic acid - water 15:3:2. The hRf value was 57. Densitometric evaluation at 265 nm. The method was linear in the range of 200-2400 ng/band. The method was suitable for routine quality control of the drug in formulation as there is no interference from excipients.

Analytical Chemistry - An Indian Journal 8(4), 608-612 (2009). An HPTLC method is reported for estimation of lupeol and beta-sitosterol from the whole plant of Vernonia cinerea (Acanthaceae). Methanolic extracts of the plant were subjected to chromatographic analysis on silica gel with toluene - methanol 220:3. Derivatization with Liebermann-Burchard reagent. Densitometric evaluation at 366 nm. The plant was found to contain 0.49 mg/g and 1.4 mg/g of lupeol and beta-sitosterol respectively. The method was suitable for quality control of herbal raw material.