Sedat Imre

Characterization and lime treatment of olive mill wastewater.

Seventeen olive mill wastewater (OMW) samples were characterized. For characterization of the samples, amount of total, fixed, volatile, suspended, volatile-suspended solids, COD, oil-grease, polyphenol, volatile phenol, nitrogen and reducing sugar were determined. Effects of lime treatment on the waste samples were investigated. Reduction of contents of the samples treated with the lime was described. The effect of the addition of lime on an artificial phenolic mixture was also examined.

Laurenyne, a new acetylene from Laurencia obtusa: crystal structure and absolute configuration

Abstract Laurenyne, a new chloroacetylene from the red form of the alga Laurencia obtusa has been identified and its crystal structure determined.

Obtusallene I, a new halogenated allene from Laurencia Obtusa

Abstract Obtusallene, a new halogenated bicyclic ether with an allenic side chain, has been isolated from the red form of the alga Laurencia obtusa, and identified by spectroscopic methods and X-ray crystallography.

Halogenated secondary metabolites from Laurencia Obtusa

A new sesquiterpene (1), and a halogenated C15 acetogenin (2), a stereoisomer of neoisoprelaurefucin were isolated from Laurencia obtusa. Four known compounds laurencienyne (3), rogiolenyne B (4), obtusenol (5), and (3E)-dactomelyne (6) were also isolated from this alga. Rogiolenyne B (4) and (3E)-dactomelyne (6) were found for the first from this species. The structures of these compounds were elucidated by spectroscopic methods. The unambiguous assignments of the 1H and 13C NMR spectral data of (5) and 13C NMR data of (6) were also reported for the first time.

Anthraquinones in Digitalis species

Abstract Twenty anthraquinones have been found in the roots of Digitalis trojana of which the following are new: digitopurpone-1-methyl ether, ω-hydroxypacybasin and ω-hydroxyziganein. The biogenesis of the thirty anthraquinones now known in Digitalis s.l. is discussed.

A photo artefact from linderazulene

Abstract Exposure of an ethanolic solution of linderazulene to direct sunlight yields the sesquiterpene keto-lactone 2 .

Ent-13-epiconcinndiol from the red alga Chondria tenuissima and its absolute configuration

Abstract The bromo-diterpene, ent -13-epiconcinndiol, has been isolated from the marine red alga Chondria tenuissima . Its absolute configuration was determined by X-ray crystallography.

Polybrominated Non-Terpenoid C15 Compounds from Laurencia paniculata and Laurencia obtusa

Two polybrominated C15-acetogenins (1,2) isolated from a Mediterranean sponge previously and a new polybrominated bicyclic ether with a bromoallenic side chain (3) were isolated from Laurencia paniculata and Laurencia obtusa respectively. The structures of these compounds were elucidated by spectroscopic methods.

Determination of poly(ethylene glycol)-400 in urine by fourier transform–infrared spectrometry

A simple and rapid method for the analysis of poly(ethylene glycol)-400 (PEG-400)(used in the study of intestinal physiology) in human urine is described using Fourier transform–infrared spectrometry. The quantitative measurements were carried out by using the absorbance value of the C—O—C band (wavenumber 1100 cm–1). The lower limit of determination of PEG-400 in human urine was 0.8 mg cm–3. Analytical recovery of PEG-400 added to urine controls was 99.6%. The results of the analyses of one urine sample were compared with those obtained by using high-performance liquid chromatography. Limitations and advantages of the two systems are discussed.

An anthraquinone from the roots of Digitalis davisiana

Abstract A new anthraquinone, 1-hydroxy-2-hydroxymethyl-8-methoxyanthraquinone, was isolated from the root of Digitalis davisiana .