5 results match your criteria: "Institute of Chemistry at Tallinn Technical University[Affiliation]"
Chemosphere
February 2002
Department of Environmental Chemistry and Technology, Institute of Chemistry at Tallinn Technical University, Estonia.
The kinetics of the degradation of seven nitrophenols (2-nitrophenol, 4-nitrophenol, 2,5-dinitrophenol, 2,6-dinitrophenol, 2,4-dinitrophenol, 2-methyl-4,6-dinitrophenol, 4-methyl-2,6-dinitrophenol) with the Fenton reagent, photo-Fenton, and hydrogen peroxide photolysis was investigated. The efficiency and operating costs for the studied treatments were evaluated and compared. The Fenton reagent was found to be the most efficient and the cheapest way for the nitrophenols (NPs) degradation.
View Article and Find Full Text PDFElectrophoresis
February 2002
Department of Analytical Chemistry, Institute of Chemistry at Tallinn Technical University, Tallinn, Estonia.
Acetonitrile is a well-suited medium for nonaqueous capillary electroseparations and enables extending the range of applications of capillary electrophoresis (CE) techniques to more hydrophobic species. In this study, the dialkylimidazolium-based low temperature melting organic salts know as "ionic liquids" (ILs) are used as electrolytes. At room temperature these liquids are miscible with acetonitrile which makes it easy to use them for adjustment of analyte mobility and separation.
View Article and Find Full Text PDFNat Prod Lett
February 2002
Institute of Chemistry at Tallinn Technical University, Estonia.
Starting from ergosterol two novel 9,11-secosterols with modified side chains (1a) and (1c) were synthesized via eight main transformations.
View Article and Find Full Text PDFProc Natl Acad Sci U S A
July 2001
Department of Bioorganic Chemistry, Institute of Chemistry at Tallinn Technical University, Akadeemia tee 15, Tallinn 12618, Estonia.
The highest concentrations of prostaglandins in nature are found in the Caribbean gorgonian Plexaura homomalla. Depending on its geographical location, this coral contains prostaglandins with typical mammalian stereochemistry (15S-hydroxy) or the unusual 15R-prostaglandins. Their metabolic origin has remained the subject of mechanistic speculations for three decades.
View Article and Find Full Text PDFBioorg Med Chem Lett
July 1999
Institute of Chemistry at Tallinn Technical University, Estonia.
Natural prostaglandins (PG) F2alpha and E1 as well as (+)-cloprostenol were regioselectively 11-acylated using Novozym 435 as a catalyst and vinyl acetate as an acyl donor. Unlike the above compounds the 15-OH group of PGE2 was also acylated with a significant velocity under the same conditions. The enantiospecificity of the lipase-catalysed 11-acetylation of cloprostenol was established by separate treatment of(+)- and (-)-cloprostenols.
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