Chromatographia 65 (3-4), 245-248 (2007). TLC of dimethyl phthalate, diethyl phthalate, dibutyl phthalate, di(2-ethylhexyl)phthalate (DEHP), benzyl butyl phthalate, diisodecyl phthalate, dimethyl adipate, diethyl adipate, di(2-ethylhexyl)adipate, triethyl citrate, tributyl citrate, tributyl acetyl citrate and n-butyl stearate on inorganic ion-exchanger stannic silicate with toluene - ethyl acetate 10:1 over 12 cm (25 min). Quantification of DEHP by densitometry at 280 nm. Limit of quantitation for DEHP was 0.50 µg/zone and limit of detection 0.05 µg/zone.

J. Chromatogr. A 1116 (1-2), 272-276 (2006). Application of TLC to fractionate well-characterized aquatic humic materials coupled with the novel evaluation of the trihalomethane formation potential of the fractionated materials. HPTLC on silica gel with methanol - ethyl acetate 2:1. Identification of three common fractions based on retention factor (Rf) in all substances examined.

J. Planar Chromatogr. 20, 399-406 (2007). General aspects of food analysis using planar chromatography as an optimum tool for national and international standards to keep analysis economical. Contents: 1. The changing situation as a challenge; 2. TLC and HPTLC applications in food analysis and rapidly growing topics; 2.1 Topics in the past twenty years; 2.2 Rapidly growing topics in the future; 3. Is HPTLC a reliable quantitative method in food analysis; 3.3 Performance key data; 3.2 Method comparison; 3.3 Separating power; 4. Obstacles and benefits of planar chromatography; 4.1 Obstacles; 4.2 Benefits; 5. Future potential of HPTLC in food analysis; 5.1 Simplified sample preparation; 5.2 Simultaneous determination of analytes with different detection principles or analytes difficult to detect in general; 5.3 Digital evaluation of plate images; 5.4 Bioactivity-based detection; 5.5 Mass-selective information on demand; 5.6 Cost-effectiveness; 6. Conclusions. Planar chromatography for simple solution of difficult problems, reduced sample preparation, selective derivatization, quantitative and sensitive determinations using appropriate instrumentation, compliance with regulated environments, e. g. cGMP and cGLP, validation fulfilling requirements for reliable analysis, reduced costs, high throughput and comparable results.

J. Planar Chromatogr. 20, 411-417 (2007). HPTLC of sucralose in dietetic products on silica gel impregnated with 0.1 M dipotassium hydrogen phosphate solution, and on amino phase with acetonitrile - water 17:3. Also a mixture of sucralose, sucrose, glucose, fructose was separated on amino phases with acetonitrile - water 3:1. Detection by dipping in 2-naphthol sulfuric acid reagent and aniline diphenylamine ortho-phosphoric acid reagent, followed by heating at 120 °C. Post-chromatographic derivatization on aluminium-backed amino plates was performed by heating the plate 190 °C for 20 min. Evaluation under UV light at 366 nm. For fluorescence enhancement the amino plate was dipped into a 1:2 solution of paraffin in n-hexane. Densitometric quantification by fluorescence measurement at 366 nm and by absorbance measurement at 500 and 405 nm.

J. Planar Chromatogr. 20, 13-18 (2007). Graft TLC separation of 28 pesticides (aziprotryne, fenvalerate, desmetryn, terbutryn, pyriproxyfen, benzthiazuron, fluoroglycofen-ethyl, bensultap, benalaxyl, thiabendazole, metalaxyl, tetramethrin, imazalil, atrazine, chlorfenvinphos, methoxychlor, carbaryl, alachlor, bromopropylate, captan, diuron, tetradifon, napropamide, metribuzin, metamitron, p,p’-DDE, dinoseb, monolinuron) on connected layers - silica and octadecyl silica wettable with water, achieved by two dimensional planar chromatography using a non-aqueous mobile phase in the first dimension and an aqueous reversed-phase mobile phase in the second dimension. HPTLC on silica gel with 1) ethyl acetate - n-heptane 1:4 or 3:7 in the first dimension and, after cutting into strips, connection with RP 18 plates and transfer with methanol, with 2) methanol - water 3:2 or 3:1 in the second dimension. Detection under UV light at 254 or 366 nm.

59th Indian Pharmaceutical congress C-305, 297, (2007). Phytoconstituents of mature and immature tubers of Ipomoea mauritiana (methanolic and aqueous extracts) have been studied. HPTLC on silica gel with chloroform - methanol - formic acid 6:3:1. Detection by spraying with vanilin - sulphuric acid reagent. Densitometric evaluation at 365 nm. Mature tubers were found to contain higher concentration of phytoconstiuents than immature tubers.

59th Indian Pharmaceutical congress F-54, 402, (2007). HPTLC of amlodipine besylate and bisoprolol on silica gel with methanol - ethyl acatete - ammonia 1:12:1. Densitometric evaluation at 229 nm. The method was linear in the range of 500-1000 ng/zone. Recovery was 99.9 -101.5 %.

J. Sep. Sci. 30, 2086-2091 (2007). HPTLC of 4alpha-methyl-24beta-ethyl-5alpha-cholesta-14,25-dien-3beta-ol (1), 24beta-ethylcolesta-5,9,11,22E-trien-3beta-ol (2), and betulinic acid (3) in Clerodendrum inerme on silica gel with toluene - ethyl acetate 47:3. Quantitative determination by absorbance measurement at 620 nm. The hRf value was 48, 34 and 22 for compounds (1) , (2) and (3), respectively. Linearity was between 100 and 2500 ng/zone. The limits of detection and quantification were 5, 6, and 10 µg/mL and 14, 18, and 29 µg/mL, respectively, for (1), (2), and (3).