J. Planar Chromatogr. 15, 380-383 (2002). HPTLC of 24 2-(2,4-dihydroxyphenyl)benzothiazoles on RP-8 and RP-18 with water-methanol mixtures with amounts of methanol in the range 0.50-1.0 v/v at intervals of 0.05. Densitometry at 325 nm.

Bioorg. Med. Chem. 11, 1583-1592, 2003. TLC high throughput assay for screening of potential Mur enzyme inhibitors. Application of 2-aL aliquots of reaction mixtures containing Mur enzymes, ATP[a-32P], and inhibitors on PEI cellulose. Developed in 0,75-M KH2PO4 (pH 3,4) for at least 3 h. Radioactive spots corresponding to ATP[a-32P] and ADP[a-32P] were scanned and quantified using a phospho imager system.

J. Liq. Chrom. & Rel. Technol. 26, 3277-3287 (2003). TLC of 13 5,5-disubstitited barbiturates (e.g. barbital, pentobarbital, butabarbital, amobarbital, phenobarbital, aprobarbital, butalbital, talbutal, cyclopal) on RP-18 with methanol - water and methanol - Bates-Bower borate buffer mixtures. The methanol content was varied by 5% volume from 40 to 100%. After drying, visualization under UV 254 nm. Significant correlations were found between e.g. RM, RM0, log kIAM, log P, selected biological activity values, and topological indices. TLC results as base for theoretical considerations.

CBS 86, 7 (2001). HPTLC on silica gel in horizontal development chamber with acetone - water 9:1 with chamber saturation for 15 min. Detection by dipping 1 s in 0.02 % 4-nitrosodimethylaniline in ethanol with 0.01 N HCl (adjusted at pH 2) followed by heating at 150 °C. Quantitative determination by absorbance measurement at 495 nm.

J. Liq. Chrom. Rel. Technol. 27, 2057-2070 (2004). HPTLC of pioglitazone hydrochloride ((±)-5-[p-[2-(ethyl-2-pridinyl)ethoxy]-benzyl]-2,4-thiazolidinedione hydrochloride), rosiglitazone maleate ((±)-5-[4-[2-[N-methyl-N-(2--pyridinyl)amino]-ethoxy]benzyl]-2,4-thiazolidinedione maleate), and repaglinide S(+)-2-ethoxy-4-[N-[1-(2-piperidinophenyl)-3-methyl-1-butyl]-aminocarbonylmethyl]benzoic acid on cyano-phase with 1,4-dioxane - buffer pH 2.8/4.4/6.4/7.9 1:4; 2:3; 1:1; 3:2; 2:1 in horizontal chambers without saturation. Quantitative determination of pioglitazone by reflectance/transmittance measurement at 266 nm.

J. Planar Chromatogr. 17, 46-50 (2004). Two-dimensional TLC and HPTLC of cephalosporins (cefaclor, cefaperazone sodium, cefazolin sodium, cefotaxime sodium, cefoxitin sodium, cefuroxime sodium, cephalothin sodium, p-chlorophenacyl cephalotin ester) on silica gel in a horizontal chamber with methanol - 98 % formic acid - ethyl acetate 29:1:70 in the first dimension followed by methanol - toluene - ethyl acetate - 98 % formic acid 1:4:13:2 in the second dimension after drying for 1 h . Detection under UV light at 254 and 366 nm. Quantitative determination at 240 nm.

IPC 56th 2004, Abstract No. DP-33. An HPTLC method is reported for the standardization of Trikatukuc Curanam, an Ayurvedic preparation with Piper nigrum and Piper longum, both containing piperine as major alkaloid. HPTLC of piperine on silica gel with toluene - ethyl acetate 7:3 .Extraction with methylene chloride, the evaporated residue of the organic layer was taken in ethyl acetate and subjected to the analysis.The band corresponding to piperine was scanned at 338 nm. Linearity was 8-40 ng with recovery of 99.03 %.

IPC 56th 2004, Abstract No. CP-32. A stability indicating HPTLC method has been developed for the analysis of solid dosage forms containing beta-carotene. HPTLC of beta-carotene on silica gel with petrol ether (40-60 °C) - methanol - toluene 4:8:1. Rf value of beta-carotene was 0.65-0.70. Quantification by densitometric evaluation at 460 nm. The method was validated for accuracy, precision, linearity, and stability, and can be adopted for routine analysis of beta-carotene in formulations.