J. Liquid Chromatogr. 12, 949-956 (1989). TLC of bleomycin complex on silanized silica with aqueous ammonium nitrate (2.5%) – methanol 7:3, or on silica with aqueous diammnonium hydrogen phosphate (2.5%) – methanol 1:1. Detection under UV 254 nm. Identification by densitometry at 291 nm. Comparison of the results with those obtained by spectrophotometry and HPLC. TLC method is highly suitable for routine quality control of bleomycines as a number of samples could be analysed within a short time (68 samples/analyst/day).

Anal. Letters 24, 217-232 (1991). TLC of terfenadine on silica with methanol – butanol – water – toluene – acetic acid 20:30:10:20:1. Quantification by densitometry at 254 nm. Comparison with non-aqueous titration method and ion-pair formation method, etc.

Chinese J. Food & Ferm. Ind. (Shipin Yu Fajao Gongye) (5), 75-78 (1992). TLC of agaritine on cellulose with butanol - acetic acid - water 65:15:25. Detection by spraying with a solution of p-dimethylaminobenzaldehyde in methanol. Detection limit 0.05 µg/spot. Comparison with HPLC and ion exchange column chromatographic methods.

2. Comparison of the selectivity of the systems and quantitative determination of hydrophobicity parameters. J. Planar Chromatogr. 8, 122-128 (1995). Comparison of the chromatographic behavior of some sulfonamides on normal and reversed phase TLC plates with methanol, isopropanol, ethanol, ethyl acetate, acetonitrile, MEK, dioxane and THF. Appropriation of a large amount of information about the hydrophobicity (RM°), the mechanism of adsorption, and the possibilities of separation of the sulfonamides by systematic investigation. The methods described are less expensive than GC and HPLC and easily be adapted for application in most routine quality control laboratories.

J. Chromatogr. A 791, 245-253 (1997). Determination of single polymer species of non-ionic detergents of the polyoxyethylene type by MALDI-MS. Separation of single polymer species by TLC on silica gel with ethyl acetate - isooctane - acetic acid - water 13:2:3:10, and RPC methods as verified by MALDI-MS. Comparison of the methods.

Indian Drugs 41 (8), 482-487 (2004). HPTLC on silica gel with toluene - acetone - ammonia 50:50:1. Quantitative determination by absorbance measurement at 315 nm. The method was validated in terms of linearity (300-1000 ng/spot), precision, accuracy, and specificity. For the content uniformity test the tizanidine hydrochloride content of 10 individual tablet units of two market formulations was determined after extracting with methanol. Both formulations compiled with the USP specification. The proposed content uniformity allows the parallel analysis of ten tablets on a single plate and provides a faster and cost-effective quality control tool for routine analysis. A simple, sensitive HPTLC content uniformity test was developed and validated for the analysis of tizanidine hydrochloride in its commercial single component tablet formulations (2 mg/tablet).

IPC 56th 2004, Abstract No. GP-8. Simultaneous HPTLC determination of ranitidine and domperidone on silica gel with methanol - 1, 4-dioxan 2:3. Quantitative determination by densitometric scanning at 282 nm. Rf values were 0.33 for ranitidine and 0.78 for domperidone. Linearity range was 0.5 – 2.5 mg/mL for both of the drugs. The recovery was in the range of 100.25 – 100.78 %. The method is suitable for the analysis of both drugs in combined dosage form.

J. Planar Chromatogr. 19, 58-61 (2006). HPTLC of xanthohumol and isoxanthohumol on silica gel with toluene - dioxane - acetic cacid 77:20:3 in an unsaturated flat-bottomed chamber. Quantification by scanning at 368 nm. The detection limit was 2 ng per spot. The method was validated for precision, accuracy, and repeatability. The method is specific; a linear relationship was obtained between response (peak area) and amount of xanthohumol in the range of 7.7-77 ng per spot; the correlation coefficient was 0.997. Recovery at the three levels was found to be 119.1 %, 95.7 %, and 96.7 %, respectively. Instrumental presision and repeatability were 0.38 and 1.5 %, respectively. Intra-day and Inter-day precision were 1.7 and 2.3 %, respectively.