Search results for "Sulfoxide"
showing 10 items of 313 documents
Therapeutic properties of haemodialysis and blood exchange transfusion in organophosphate poisoning
1976
Human blood was contaminated with nitrostigmine, dimethoate and demeton-S-methyl sulfoxide. It was then dialysed, concentrations of organophosphates were determined and dialysance values calculated. The influence of blood exchange transfusion on poison elimination as well as on the cholinesterase activity of blood, brain and muscle was studied in rats poisoned with nitrostigmine. Haemodialysis was found to be quite an effective method for eliminating demeton-S-methyl sulfoxide and dimethoate, dialysance values of 52.98 ml/min and 59.07 ml/min being found for demeton-S-methyl sulfoxide and dimethoate respectively. Nitrostigmine could not be removed by haemodialysis. These findings suggest th…
Cannabinoid control of brain bioenergetics: Exploring the subcellular localization of the CB1 receptor
2014
Brain mitochondrial activity is centrally involved in the central control of energy balance. When studying mitochondrial functions in the brain, however, discrepant results might be obtained, depending on the experimental approaches. For instance, immunostaining experiments and biochemical isolation of organelles expose investigators to risks of false positive and/or false negative results. As an example, the functional presence of cannabinoid type 1 (CB1) receptors on brain mitochondrial membranes (mtCB1) was recently reported and rapidly challenged, claiming that the original observation was likely due to artifact results. Here, we addressed this issue by directly comparing the procedures…
Heterogeneous response to differentiation induction with different polar compounds in a clonal rat rhabdomyosarcoma cell line (BA-HAN-1C)
1989
The clonal rat rhabdomyosarcoma cell line BA-HAN-1C was tested for its susceptibility to differentiation induction with different polar compounds. This cell line is composed of proliferating mononuclear tumour cells, some of which spontaneously fuse to form terminally differentiated postmitotic myotube-like giant cells. Exposure of BA-HAN-1C cells to dimethylsulphoxide (DMSO), hexamethylene bisacetamide (HMBA), sodium butyrate (NaBut) and N-monomethylformamide (NMF) resulted in a significant inhibition of proliferation (P less than 0.001) and in a simultaneous increase in differentiation. The response was most pronounced after exposure to NMF as evidenced by a marked increase in the creatin…
Dimethylsulfoxide as carrier in enzyme cytochemistry.
1971
Addition of dimethylsulfoxide (DMSO) to the incubation medium of succinate dehydrogenase in a concentration of 10% enhances the staining reaction in the hyphae of the fungus Cercosporella herpotrichoides after an incubation period of 15 min. Controls without DMSO remain unstained. DMSO causes a rapid penetration of the components of the medium through the mucilage that covers the hyphae.
Albumin binding and hydrophobic character of promazine and chlorpromazine metabolites.
1972
1. The binding of didesmethylpromazine, promazine N-oxide, 2-hydroxypromazine, promazine sulfoxide, monodesmethylpromazine sulfoxide, didesmethylchlorpromazine, chlorpromazine N-oxide, and chlorpromazine sulfoxide to bovine serum albumin was determined by means of sephadex gel filtration. 2. The albumin binding of these substances was characterized by the following parameters: the percentage α of free substance, the percentage β of bound substance, the binding constants K1, k+ and m, the number of binding sites per albumin molecule, and the free binding energy ΔFo. 3. The partition coefficients between n-octanol and buffer solution, pH 7.40, were measured for the above mentioned metabolites…
Synthesis of a New Fluorinated Oxazolidinone and Its Reactivity as a Chiral Auxiliary in Aldol Reactions.
2007
A new enantiomerically pure fluorinated oxazolidinone has been prepared from a fluorinated imidoyl chloride and an optically pure sulfoxide. The diastereoselective reduction of the β-iminosulfoxide thus formed followed by elimination of the sulfoxide and cyclization of the created aminoalcohol furnishes the desired product. The fluorinated oxazolidinone was subsequently used as a chiral auxiliary in Aldol reactions. We also found that the selective formation of the syn-Evans and syn-non-Evans diastereoisomer can be controlled by adjusting the Lewis acid/base ratio.
Ultrasound-assisted green solvent extraction of high-added value compounds from microalgae Nannochloropsis spp.
2015
Abstract The aim of this work was to investigate ultrasound (US)-assisted green solvent extraction of valuable compounds from the microalgae Nannochloropsis spp. Individual green solvents (water, ethanol (EtOH), dimethyl sulfoxide (DMSO)) and binary mixture of solvents (water-DMSO and water-EtOH) were used for the extraction procedures. Maximum total phenolic compounds yield ( Y p ≈ 0.33) was obtained after US pre-treatment ( W = 400 W, 15 min), being almost 5-folds higher compared to that found for the untreated samples and aqueous extraction ( Y p ≈ 0.06). The highest yield of total chlorophylls ( Y c ≈ 0.043) was obtained after US ( W = 400 W, 7.5 min), being more than 9-folds highe…
Synthese von 2-Acyloxy- und 2-Alkyloxy-3-ketoglycalen und ihren Bromaddukten
1983
Die an den Hydroxygruppen acetyl-, pivaloyl- und methylgeschutzten 2-Hydroxy-3-ketoglycale 5a, 5b bzw. 11 werden durch Oxidation der entsprechenden 1-O-Acylglucopyranosen 3a, 3b bzw. 9 an der freien 3-Hydroxygruppe mit Dimethylsulfoxid/Acetanhydrid oder Chlorsulfonylisocyanat hergestellt und charakterisiert. Nur beim Acetylderivat 3a verlaufen die Oxidation und die Eliminierung des 1-Acetyloxysubstituenten in einem Schritt. Beim Pivaloylderivat 3b und beim Methylderivat 9 mus die Eliminierung aus der 3-Ulose 4 bzw. 10 mit Diazabicycloundecen (DBU) vervollstandigt werden. – Die geschutzten Hex-1-enopyran-3-ulosen 5a, 5b und 11 addieren Brom stereoselektiv unter Bildung der D-ribo-konfigurier…
A rapid and cost-efficient DMSO-based method for isolating DNA from cultured lichen photobionts
2010
We have developed a simple and fast procedure for the purification of PCR-quality DNA from cultured lichen photobionts. This new one-step method uses the solvent dimethyl sulfoxide (DMSO) combined with heat treatment to chemically breakdown algal and plant tissues. The DMSO-DNA extracts may be directly precipitated and purified by standard techniques in a total time of approximately 30 min. Compared to other DNA extraction protocols, the DMSO-based method suppresses the need for liquid nitrogen, any extraction buffer, grinding, phenol, and long incubation or centrifugation steps, thereby considerably reducing the possibility of contamination. In addition, minimal amounts of starting materia…
Role of Phase Behavior and Atomization in the Supercritical Antisolvent Precipitation
2003
An experimental study on supercritical antisolvent (SAS) precipitation has been performed to gain insight into the role of phase behavior and atomization in controlling morphology and dimension of precipitates. The mixture yttrium acetate/dimethyl sulfoxide has been used as the main model system and supercritical CO 2 has been used as the antisolvent. Two SAS apparatuses (laboratory and pilot scale) with two injector arrangements and operating with various injector diameters in the range 60-500 μm have been used. The results showed that operating above the mixture critical point (MCP) of the ternary mixture yttrium acetate/dimethyl sulfoxide/ carbon dioxide, sub-micrometric particles are ge…