J. Planar Chromatogr. 16, 433-437 (2003). TLC of prenylamine, lidoflazine, bepridil hydrochloride, and fendiline hydrochloride on RP-8 and RP-18 altering the pH and the concentration of organic modifier (methanol, ethanol, tetrahydrofuran, acetonitrile) in the aqueous phase. On RP-8 the best separation was achieved with 50% acetonitrile in pH 2.06 phosphate buffer and on RP-18 with 50% ethanol in pH 2.06 phosphate buffer. Detection under 254 nm and videodensitometric determination. New TLC procedure.

CBS 87, 4-5 (2001). HPTLC on silica gel with ethyl acetate - chloroform - methanol 6:4:1. Detection by dipping in fluorescamine solution. Quantitative determination by fluorescence measurement at 365/>400 nm.

Indian J. Pharm. Sci. 66 (3), 283-286 (2004). TLC of lamotrigine in its tablet dosage form on silica gel with acetone - toluene - ammonia 14:6:1. Quantitative determination by absorbance measurement at 312 nm. The method was quantitatively evaluated in terms of linearity, accuracy, precision, repeatability, and specificity to prove its utility in the analysis of tablet dosage form.

J. Planar Chromatogr. 17, 164-168 (2004). HPTLC of flupirtine maleate on silica gel with ethyl acetate - methanol - 25 % ammonia 17:2:1 in a saturated developing chamber. Then the developed plate must be dipped for 2 s in 1:3 paraffin - hexane. Dipping increases the fluorescence tenfold and preserves the fluorescence stability for hours. Presentation of a new formula for transforming fluorescence measurements in accordance with Kubelka-Munk theory. The fluorescence signals, the absorption signals, and data from a selected reference are combined in one expression. Only diode-array techniques can measure all the required data simultaneously. The fluorescence calibration curve was linear over the range 300 to 5000 ng per spot.

IPC 56th 2004, Abstract No. GP-17. HPTLC of mirtazapine in tablet dosage form on silica gel with chloroform - methanol 1:9. The Rf value was 0.50 - 0.52, the linearity range was 0.3 - 1.5 mg/spot. Quantitative determination by scanning at 295 nm. The method was validated for accuracy, precision, linearity, specificity, LOD, and LOQ.

J. Planar Chromatogr. 18, 372-376 (2005). HPTLC of sildenafil in four commercial products and three aphrodisiac herbal preparations on silica gel after pre-saturation with chloroform - methanol - diethylamine 90:10:1. Quantitative determination by absorbance measurement at 305 nm. Recovery was 100.6 and 98.2 % for pure and spiked samples.

J. AOAC Int. 88, 1517-1524 (2005). HPTLC of fenofibrate and gemfibrozil on diol phases in horizontal chambers using the sandwich technique with hexane - tetrahydrofuran 4:1. Quantitative determination by classical densitometry at 227 nm and videodensitometry at 254 nm. Recovery in the densitometric assay was 101.4 % for fenofibrate and 100.5 % for gemfibrozil. Videodensitometry resulted in recoveries of 102.7 % and 98.8 %, respectively.

Abstract G-29, IPC (2005). HPTLC of valdecoxib in tablets and human plasma on silica gel with methanol - water - chloroform 6:3:1. Celecoxib was used as internal standard. Quantitative determination by absorbance measurement at 254 nm. The compound was extracted from plasma with ethyl acetate showing an extraction yield of 85 %. Linearity was obtained in the range of 25-200 ng/mL, recovery rate was 99.8 % from tablets and 97.2 % from plasma.