J. Planar Chromatogr. 22, 245-348 (2009). HPTLC of doxofylline (7-(1,3-dioxalan-2-ylmethyl)theophylline) in bulk drug and in formulations on silica gel, prewashed with methanol, with toluene - methanol 4:1 in a twin trough chamber saturated for 20 min. Quantitative determination by absorbance measurement at 275 nm.

60th Indian Pharmaceutical Congress PA-227 (2008). HPTLC of oxcarbazepine (in acetonitrile extracts of human plasma) on silica gel with ethyl acetate - toluene - methanol 7:2:1. The hRf values of oxcarbazepine and the internal standard chlorzoxazone were 54 and 86, respectively. The linearity range was 10-300 ng/mL, recovery from plasma was 75.2 %.

Abstract No. F-256, 61st IPC (2009). HPTLC of cefixime trihydrate and erdosteine in combined capsule dosage form on silica gel with ethyl acetate - acetone - methanol - water 15:5:5:3. Quantitative determination by absorbance measurement at 235 nm. The calibration curve was linear between 100 and 500 ng/band for cefixime and 150 to 750 ng/band for erdosteine. The limit of detection and quantification for cefixime was 0.37 µg/mL and 1.14 µg/mL, respectively and for erdosteine 0.33 µg/mL and 1.04 µg/mL, respectively.

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.

Abstract No. 259, 61st IPC (2009). HPTLC of quercetin in alcoholic extracts of the leaves of Cinnamomum malabatrum on silica gel with toluene - acetone - formic acid 36:12:5. Quantitative absorbance measurement at 254 nm. The alcoholic extract was found to contain 10.02 mg/g of quercetin. The total flavonoid content was estimated using a colorimetric method with aluminum chloride. Results were in good correlation with the HPTLC method.

IPA Convention, 2010, RA-PO 35. HPTLC of citicoline sodium in tablet formulation on silica gel with chloroform - methanol - water 3:7:3. The compound was well resolved with an hRf value of 53. Densitometric measurement at 280 nm. The method was linear in the range of 300-900 ng/band. HPLC analysis was performed on RP18 column using 1 % formic acid - methanol 19:1. Results obtained with either method were comparable.

Abstract No. F-234 61st IPC (2009). A stability-indicating HPTLC method is reported for estimation of diacerein in the presence of its degradation products. HPTLC on silica gel with toluene - ethyl acetate - formic acid 50:30:1. The hRf value of diacerein was 39. Densitometric analysis at 254 nm. The method was found to be linear in the range of 100-600 ng/band. The method was validated regarding stability. The sample was subjected to different stress conditions (acid/base hydrolysis, oxidation, photolysis, thermal) and showed extensive degradation in alkaline medium and mild degradation under acidic and oxidative conditions. The method allowed separation of diacerein from different degradation products.

Encyclopedia of Chromatography Third Edition 1, 2319-2322 (2009). The author describes the techniques and instruments for the detection and quantification of radiolabeled substances in thin-layer radiochromatography (TLRC) or radio-TLC. In detail, film autoradiography, liquid scintillation counting (LSC), storage phosphor imaging and in situ radioactivity scanning are described. The instruments for these methods are highly automated providing significant advantages in radiopharmaceutical purity determination, metabolism studies and many other investigations.