Search results for "ethanol"
showing 10 items of 2041 documents
ChemInform Abstract: Heterocyclic Photorearrangements. Photochemical Behaviour of Some 3,5-Disubstituted 1,2,4-Oxadiazoles in Methanol at 254 nm.
1989
Photochemical behaviour of some 3,5-disubstituted 1,2,4-oxadiazoles in methanol at 254 nm has been investigated. Ring photoisomerization to the 1,3,4-oxadiazole heterocycle or formation of open chain compounds involving the nucleophilic solvent was shown to depend on the nature and the position of the substituent. Photoinduced ring closure into the benzimidazole system, involving a 3-N-phenylamino side chain sequence and a photolytic intermediate of the oxadiazole heterocycle, is also reported.
Chromatographic separation of chlorthalidone enantiomers using β-cyclodextrins as chiral additives
2000
Different beta-cyclodextrins have been tested as chiral additives in the mobile phase for the chromatographic analysis of chlorthalidone enantiomers in a C18 LiChrospher (125 x 4 mm I.D.) column. The effect on enantioresolution of different parameters was studied: composition of the mobile phase (percentage of organic solvent, type of buffer and pH), mobile phase flow-rate, and type and concentration of beta-cyclodextrin. A 25:75 mixture of methanol and 0.1 M phosphate buffer, pH 4, containing 2% triethylamine (v/v), and 12.5 mM beta-cyclodextrin, at a flow-rate of 0.8 ml/min, was found to be the best option for the resolution of chlorthalidone enantiomers. Under such conditions, linear cal…
Thermal transformation of micro-crystalline cellulose in phosphoric acid
2011
Use of crude oil derivatives such as diesel and gasoline is becoming unsuitable due to their detriment to environment and to the increasing worldwide energy demand which is driving crude oil reservoirs towards exhaustion. Replacement of diesel and gasoline with biofuels (i.e. biodiesel and bioethanol, respectively) is very desirable. In fact, biofuels are not only environmentally sustainable, but also potentially inexhaustible due to the large amounts of waste biomasses from which they can be retrieved. In the present study, a model compound (micro-crystalline cellulose) was dissolved in phosphoric acid and converted at 80 °C to glucose, thereby providing the possible substrate for fermenta…
Catalytic transesterification of Pistacia chinensis seed oil using HPW immobilized on magnetic composite graphene oxide/cellulose microspheres
2018
Abstract In the present study, magnetic composite graphene oxide/cellulose (GO/CM@Fe3O4) microspheres were prepared as support material, which are cost-efficient, non-toxic and environmental friendly. The microspheres with higher adsorption capacity were further modified using triethylene tetramine (TETA), and H3PW12O40 (HPW) was immobilized to form GO/CM-NH2@Fe3O4-HPW microspheres as heterogeneous catalyst for biodiesel production. The novel heterogeneous catalyst was characterized by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), Brunauer-Emmett-Teller (BET) and X-ray diffractometry (XRD). For the first time, GO/CM-NH2@Fe3O4--HPW was applied in the tr…
Protein traffic is an intracellular target in alcohol toxicity
2011
Eukaryotic cells comprise a set of organelles, surrounded by membranes with a unique composition, which is maintained by a complex synthesis and transport system. Cells also synthesize the proteins destined for secretion. Together, these processes are known as the secretory pathway or exocytosis. In addition, many molecules can be internalized by cells through a process called endocytosis. Chronic and acute alcohol (ethanol) exposure alters the secretion of different essential products, such as hormones, neurotransmitters and others in a variety of cells, including central nervous system cells. This effect could be due to a range of mechanisms, including alcohol-induced alterations in the d…
Biphenyls and xanthones from the podostemaceae
1992
Abstract Investigation of the fruiting parts of Mourera fluviatilis afforded 6-desoxyjacareubin, trapezifoliaxanthone and a series of eight new biphenyl derivatives; 3,5-dimethoxybiphenyl; 2,2-dimethyl-5-methoxy-7-phenylchromene; 2,2-dimethyl-7-methoxy-5-phenylchromene; 2-(3,3-dimethylallyl)-3-hydroxy-5-methoxybiphenyl; 2,3-dihydro-6-methoxy-4-phenyl-2,3,3-trimethylcoumarone; [(2,3-dihydro-3,3-dimethyl-6-methoxy-4-phenyl)-2-coumaronyl]methanol; 2,3-dihydro-3,3-dimethyl-6-methoxy-2-oxo-4-phenylcoumarone; and a dimeric biphenyl.
Does ethanol intake interfere with the evaluation of glycated hemoglobins?
1989
Ethanol and/or its metabolites interfere with the chromatographic assay of glycated hemoglobins. Fasting plasma glucose, blood ethanol, HbA(1), HbA(1c), HbA(1a+b), MCV and GGT were determined in 22 control subjects; 22 alcoholics, 22 diabetic patients and 22 alcoholic diabetic patients. Fasting plasma glucose and all hemoglobin fractions were lower in alcoholic subjects and, except for HbA(1a+b), higher in diabetic patients and in alcoholic diabetic patients. HbA(1), and HbA(1c) correlated well with plasma glucose but not with blood ethanol, MCV and GGT. Glycated hemoglobin was not found to be a useful marker for alcohol abuse. With the chromatographic method we used, the evaluation of glyc…
Effects of red wine polyphenols and alcohol on glucose metabolism and the lipid profile: a randomized clinical trial.
2013
Summary Background & aims Epidemiological data suggest that moderate red wine consumption reduces cardiovascular mortality and the incidence of diabetes. However, whether these effects are due to ethanol or to non-alcoholic components of red wine still remains unknown. The aim of the present study was to compare the effects of moderate consumption of red wine, dealcoholized red wine, and gin on glucose metabolism and the lipid profile. Methods Sixty-seven men at high cardiovascular risk were randomized in a crossover trial. After a run-in period, all received each of red wine (30 g alcohol/d), the equivalent amount of dealcoholized red wine, and gin (30 g alcohol/d) for 4 week periods, in a…
Characterization of a disulphide-bound Pir-cell wall protein (Pir-CWP) ofYarrowia lipolytica
2003
In this work we have studied the disulphide-bound group of cell wall mannoproteins of Yarrowia lipolytica and Candida albicans. In the case of Y. lipolytica, SDS-PAGE analysis of the beta-mercaptoethanol-extracted material from the purified cell walls of the yeast form, showed the presence of a main polypeptide of 45 kDa and some minor bands in the 100-200 kDa range. This pattern of bands is similar to that obtained in identical extracts in Saccharomyces cerevisiae (Moukadiri et al., 1999), and besides, all these bands cross-react with an antibody raised against beta-mercaptoethanol-extracted material from the purified cell walls of S. cerevisiae, suggesting that the 45 kDa band could be th…
Varietal and geographic classification of french red wines in terms of elements, amino acids and aromatic alcohols
1988
Thirty-four French red wines from three regions already studied for their anthocyanin and flavonoid constituents have been further analysed for elements, amino acids and aromatic alcohols. An interpretation of the differences between wines related to their different geographic and varietal origins has been made from the results of statistical analyses: F statistic, principal component analysis (PCA) and stepwise discriminant analysis (SDA). Wine samples produced near Bordeaux were found to be characterised by higher rubidium and lower lithium and calcium concentrations. Differences between wine samples made from the same grape variety or produced in the same region are mainly related to dif…