J. Liq. Chromatogr. Relat. Technol. 30, 2231-2244 (2007). HPTLC of eight cephalosporins (cefaclor, cefoperazone, cefazolin, cefotaxime, cefoxitin, cefuroxime, cephalotin, and p-chlorophenacyl cephalothin) on silica gel with diisopropyl ether - toluene - ethyl acetate - 80 % formic acid 1:4:13:2 in a sandwich chamber. Also HPTLC on diol-, amino-, and cyano-modified silica gel. Detection under UV light at 254 nm.

Ind. J. Pharm. Sci. 70(3), 398 - 400 (2008). HPTLC of ibuprofen and pseudoephedrine HCl on silica gel with tert-butanol - ethyl acetate - acetic acid - water 7:4:2:2. Quantitative determination by absorbance measurement at 254 nm. The hRf value of pseudoephedrine was 68 and of ibuprofen 91. The method was linear in the concentration range of 45.6 - 75.6 µg/mL for ibuprofen and 6.8 - 11.3 µg/mL for pseudoephedrine. The recovery was between 100.7 and 101.0 % for both compounds. The method was suitable for routine quality control.

Chem. 18(1), 667-672 (2006). HPTLC of mefenamic acid and drotaverine HCl in tablets on silica gel with methanol - toluene - triethylamine 10:75:2. Quantitative determination by absorbance measurement at 241 nm. The hRf values were 31 and 47 for mefenamic acid and drotaverine HCl, respectively. The method was validated in terms of accuracy, precision, specificity, ruggedness. Linearity was between 3800 and 8400 ng for mefenamic acid and 1200 and 2700 ng for drotaverine HCl. The recovery (by standard addition method) was in the range of 99.1-100.9 % for both compounds. The method could be used for routine analysis of these compounds and their combined dosage form.

Indian Drugs 45(8), 663-666 (2008). HPTLC of geranial and luteolin from leaves of Cymbopogon citratus on silica gel with toluene - ethyl acetate 9:1 for geranial and toluene - ethyl acetate - formic acid 10:7:1 for luteolin. Densitometric evaluation at 200 nm (geranial) and 254 nm (luteolin). Alcoholic extracts of the plant leaves were found to contain 1.34 % and 1.49 % of geranial and luteolin respectively.

J. AOAC Int. 91, 1237-1243 (2008). HPTLC of zinc bis(O,O’-diisobutyl dithiophosphate), zinc bis(O,O’-didodecyl dithiophosphate), and Aglamol 99 on RP-2 by automated multiple development with methanol - water - acetic acid 6:3:2 for 25 mm, then acetonitrile - water 11:9 for 60 mm, and again acetonitrile - water for 80 mm, or on silica gel with a 14-step gradient based on toluene. For derivatization, the plate was dipped in a solution of 0.05 % primuline in acetone - water 4:1 for 1 s and immediately dried in warm air. Quantitative determination by fluorescence measurement at 366/>400 nm and by absorbance measurement at 220 nm. HPTLC-ATR-IR and HPTLC-FTIR, as well as HPTLC/DART-MS and HPTLC/ESI-MS were applied for identification.

J. Chromatogr. A 1216(20), 4485-4491 (2009). TLC of (+)-catechin and (-)-epicatechin on cellulose with water. Detection with 4-dimethylaminocinnamaldehyde in HCl produced blue bands. Detection with vanillin reagent produced quickly fading red spots. Quantitative determination by absorbance measurement at 655 nm. Linearity was between 2 to 12 ng/zone and a polynomial regression fit from 2 to 30 ng/zone. The repeatability of the separation of 20 ng/zone was 3.5 % (%RSD, n = 6). The visible limit of detection of both standards was 1 ng/zone, the densitometric limit of detection was 0.2 ng/zone. The optimized 4-dimethylaminocinnamaldehyde reagent is superior to the more frequently used vanillin reagent and is applicable also for determination of mixtures containing other catechins, such as (-)-catechin, (-)-epicatechin gallate, (-)-epigallocatechin gallate, procyanidin A2, procyanidin B1 and procyanidin B2.

J. Planar Chromatogr. 22, 15-17 (2009). HPTLC of biogenic amines (spermidine, putrescine, cadaverine, histamine, and tyramine) on silica gel (with concentration zone) in a twin trough chamber saturated for at least 1 h with acetone - ammonia 19:1. Detection by heating at 75 °C for 2 min, followed by spraying with ninhydrin reagent (300 mg ninhydrin in 100 mL n-butanol - glacial acetic acid 97:3) and again heating at 75 °C for 2 min. Quantitative determination by absorbance measurement at 410 nm.

Abstract No. 9147, IHCB (2009). HPTLC of quercetin in methanolic leaf extracts of Viola odorata on silica gel with ethyl acetate - formic acid - glacial acetic acid - water 100:11:11:26. Quantitative determination by absorbance measurement at 366/>400 nm for quantification. The extract contained 0.36 % quercetin.