J. Planar Chromatogr. 24, 154-159 (2011). TLC of avobenzone (methoxydibenzoylmethane), octocrylene, Uvinul T 150 (ethyl hexyl triazone, ET), and ethylparaben on silica gel with cyclohexane - diethyl ether 1:1 (method A), or with cyclohexane - piperidine 15:1 (method B), in a chamber lined with filter paper and saturated for 20 min. Quantitative determination by densitometry at 380 nm for avobenzene and at 300 nm for octocrylene. LOD and LOQ were 170 and 510 ng/zone for avobenzone (method A) and 180 and 537 ng/zone for octocrylene (method B), respectively. The linearity range was 200-1800 ng/zone for avobenzone and octocrylene.

J. of Chromatogr. Sci. 49, 560-567 (2011). Evaluation of the fingerprinting efficiency of a novel two-dimensional analytical system composed of RP-TLC and RP-LC-MS. The efficiency of the system was compared with that of the one-dimensional system RP-TLC with MS detection. The test samples were phenolic acid extracts from Salvia lavandulifolia. Both systems can be applied to the fingerprint analysis of herbal extracts, but the two-dimensional system based on RP-TLC and RP-LC-MS can provide more abundant information.

International Journal of PharmTech Research 3(2), 909-918 (2011). TLC of paracetamol, aceclofenac and rabeprazole on silica gel (prewashed with methanol) with ethyl acetate - methanol - glacial acetic acid 90:10:1 with chamber saturation for 20 min. The hRf value of paracetamol, aceclofenac and rabeprazole was 79, 63 and 39. Quantitative determination by densitometry in absorbance mode at 275 nm. The method was linear in the range of 100-500 ng/band for paracetamol, 20-100 ng/ band for aceclofenac, and 2-10 ng/band for rabeprazole. The recovery was between 99.2-101.0 %.

Preparative Biochemistry and Biotechnology 40, 337-346 (2010). TLC of dexrabeprazole (DEX) and domperidone (DOM) in combined dosage form on silica gel with acetone - toluene - methanol 9:9:1. Quantitative evaluation by absorbance measurement at 285 nm. The hRf of DEX and DOM was 49 and 24, respectively. The linearity range for DEX was 50-350 ng/band (r=9960) and for DOM 100-700 ng/band (r=9982).

J. Liq. Chromatogr. Relat. Technol. 34, 1502-1517 (2011). HPTLC of irinotecan in bulk drug and injectable formulations on silica gel with acetone - ethyl acetate 17:3 + 1 drop acetic acid. Quantitative determination by absorbance measurement at 366 nm. The hRf of irinotecan was 31. Linearity was 50-500 ng/zone. The LOD and LOQ was found to be 10 and 33 ng/zone. The intra-day precision was 4.3 % (n = 6) and inter-day precision over three different days was 3.1 %. Intra-day and inter-day accuracy were 96.9-100.3 % and 96.5-98.7 %, respectively. Recovery (by standard addition) ranged from 94.6-101.4 %.

J. Planar Chromatogr. 24, 507-512 (2011). HPTLC of flavonoids (quercetin and kaempferol) and biflavonoids (sciadopitysin, ginkgetin, and bilobetin) in aqueous methanolic extracts of Ginkgo biloba on RP-18 by double development with 1) acetonitrile - water - methanol - formic acid 20:20:1:0.005 and 2) acetonitrile - water - methanol - formic acid 20:17:1:0.005. Quantitative determination by densitometry in absorption mode at 254 nm. LOD and LOQ were in the range of 0.12-0.37 and 0.60-1.85 µg/zone, respectively. Linearity was found over the concentration range of 0.5-4.0 µg/zone for quercetin, kaempferol, sciadopitysin, ginkgetin, and bilobetin with correlation coefficients r = 0.9990, 0.9922, 0.9939, 0.9974, and 0.9706, respectively. Average recoveries were in the range of 97.7-100.4 %.

J. Ethnopharmacol. 137, 99-104 (2011). HPTLC of karanjin in rabbit plasma on silica gel with dichloromethane - toluene - methanol 35:15:3. Qualitative evaluation under UV 366 nm and quantitative determination by densitometry at 366 nm. Linearity was between 1.0 and 15.0 µg/mL. LOD and LOQ were 0.5 and 1.0 µg/mL, respectively. The inter-day and intra-day accuracies were 97.1 % and 92.2 %, respectively. Recovery (by standard addition) was between 98.2 % and 99.9 %.

Volumes 1-3, CBS Publishers & Distributors, New Delhi, India (2013). The first volume provides a comprehensive introduction to the HPTLC technique, including details for each HPTLC step as well as various factors which influence the performance of a HPTLC analysis. Then presented over 3 volumes, 528 protocols for the HPTLC analysis of pharmaceutical formulations follow. Each protocol provides details on the preparation of samples and standards, chromatographic equipment, parameters for densitometric evaluation, chromatographic conditions, including stationary phase, mobile phase, standard and sample application, chamber saturation, relative humidity, quantity of mobile phase, temperature, migration distance and other critical parameters. References to the original publication are given as well as comments on the validation or any comparative study. Each protocol is illustrated with a typical densitogram, structures of the compounds analysed and overlaid UV spectra of compounds analysed (for selection of suitable wavelength for densitrometric scanning). All in all a comprehensive collection of protocols for pharmaceutical formulations.