A rapid and reliable capillary zone electrophoresis method was used as a tool to obtain both qualitative and quantitative information about simple phenols, lignans, complex phenols (isomeric forms of secoiridoids), phenolic acids, and flavonoids in the solid-phase separation extracts from different Spanish extra-virgin olive oil in a short time (less than 6 min). Peak identification was done by...

The accurate O-H bond dissociation enthalpies for a series of meta and para substituted phenols (X-C6H4-OH, X=H, F, Cl, CH3, OCH3, OH, NH2, CF3, CN, and NO2) have been calculated by using the (RO)B3LYP procedure with 6-311G(d,p) and 6311++G(2df,2p) basis sets. The proton affinities of the corresponding phenoxide ions (XC6H4-O) have also been computed at the same level of theory. The effect of c...

A simple, fast, sensitive and versatile method for the analysis of phenols in water is proposed using microfluidic precolumn derivatization with the fluorogenic label coumarin-6-sulfonyl chloride (C6SCl) and HPLC separation on monolithic columns. Phenols react with C6SCl within 3.0 min in the microreactor at ambient temperature to produce phenol-coumarin sulphonamides derivatives which were sep...

1. Published data on the effects of red wine, ethanol and flavonoids on endothelium-dependent relaxation are equivocal. The present study was undertaken to determine the effects of red wine, ethanol and selected flavonoids present in red wine on endothelium-dependent relaxation. 2. Aortic rings from New Zealand White rabbits were set up in organ baths (20 ml) and contracted with noradrenaline (...

Alkaline water was used for the microwave-assisted extraction of some priority pollutants of phenols in sediments, i.e. phenol (Ph), 2-chlorophenol (2CP), 2,4-dichlorophenol (2,4DCP), 4-chlorophenol (4CP), 4-dinitrophenol (4NP) and pentachlorophenol (PCP). This organic solvent-free extraction procedure was optimized by studying the parameters such as pH, volume of the alkaline water, extraction...

Estonian shale oil contains about 25--30% phenols, and their action determines the toxicity of shale oils. The clinical symptoms of intoxication are rather similar, regardless of route of administration. Due to neurotropic action, the coordination of movements is impaired, and clonic and tetanic convulsions, paresis and paralysis of extremities, and narcosis are observed. In subacute and chroni...

Phenols (phenol and p-cresol) are amino acid metabolites produced by intestinal bacteria. Some reports have demonstrated that the accumulation of phenols in the serum has toxic effects in renal failure patients. In this study, we found that phenols accumulated in the serum of rats given a tyrosine diet, and that dietary intake of a galacto-oligosaccharide mixture (GOS) suppressed the accumulati...

Seven phenols of benzo(a)pyrene (4-, 5-, 6-, 7-, 8-, 9-, and 10-hydroxybenzo(a)pyrene) were tested for carcinogenicity on mouse skin by application of 0.4 mumole of compound once every two weeks for 56 weeks. None of the seven phenols tested was carcinogenic to mouse skin, while treatment with the same dose of benzo(a)pyrene produced tumors in 92% of the treated animals. The lack of carcinogeni...

We have briefly proposed (1) the general theory that “acetate-derived” aromatic metabolites arise ana.logously to fatty acids, by repeated condensation of malonyl coenzyme A units with an acyl coenzyme A “starter,” citing in support our own work on the 6-methylsalicylic acid of Penicillium urticae and the prior report of Bentley and Keil (2) on penicillic acid. A number of subsequent publicatio...