Chromatographia 27, 53-54 (1989). TLC on alumina - silver nitrate with benzene - ethyl acetate - methanol 2:2:1. Detection under UV 254 nm. Detection limit, 0.1 µg. Comparison with HPLC.

J. Planar Chromatogr. 2, 180-189 (1989). Properties of the sample and matrix effects, that affect quantitative TLC using scanning densitometry are discussed. The sorbent matrix influences the shape of calibration curves, and impurity gradients, resulting from contamination of the layer or application of derivatizing reagents are common sources of baseline instability. Chemical reactions catalyzed by the sorbent layer, which may also involve oxygen or light, are a source of sample instability. Fluorescence quenching and fluorescence enhancement effects can influence the reliability of quantification in the fluorescence mode. Some practical examples of the effects are discussed. Comparison of HPLC and TLC.

J. Chromatogr. 555, 239-245 (1991). HPTLC of abscisic acid on silica with toluene – ethyl acetate – acetic acid 25:15:2. Quantification by densitometry at 270 nm. Also HPLC. Comparison of the two methods.

Anal. Chim. Acta 275, 147-162 (1993). HPTLC of the anabolic residues in biological samples on silica with seven solvent systems in one or in two dimensions. Detection under UV 366 nm. Also, HPLC and GC/MS. Discussion of the influence of the matrix and the applied methods on the results.

J. Chromatogr. 674, 3-13 (1994). Discussion of the potential and the constraints of TLC, GC and HPLC towards substance identification, together with their detection modes, including color reactions on the plate, MS and diode - array UV spectrophotometry. Evaluation of the identification power of TLC and color reactions plus GC or HPLC retention indices for the purpose. The possibility for identification by means of computerized database searches are considered.

Indian Drugs 34 (6) 339-345 (1997). HPTLC on silica gel with toluene - acetone - isopropanol - NH3 60:30:20:3. Diloxanide furoate was used as internal standard. Visualization by spraying with 0.01% ninhydrin. Quantitation by densitometry at 520 nm.

Indian Drugs 41 (3), 160-164 (2004). Combinations of ofloxacin and tinidazole (1:3) are available as tablet dosage forms. Stability indicating HPTLC of ofloxacin and tinidazole on silica gel with dioxan - ethyl acetate - toluene - acetic acid - water 5.5:5:3.2:2:2 . Quantification by absorbance measurement at 307 nm. The Rf value of ofloxacin and tinidazole was found to be 0.12 and 0.85 respectively. Recovery was 99.85 % and 99.45 % for ofloxacin and tinidazole respectively. The proposed method was quantitatively evaluated in terms of calibration of concentration range, stability, and accuracy. It can be adopted for routine analysis of the formulation.

56th IPC 2004, Abstract No. GP-48. HPTLC of rabeprazole sodium in tablet dosage form on silica gel with ethyl acetate - methanol 9:1. Optimization of experimental parameters such as bandwidth, chamber saturation time, solvent front migration, and mobile phase composition. Quantitative determination by scanning at 260 nm. The Rf value was 0.59. The method was linear with a correlation coefficient of 0.99, recovery was 98.81 %.