The electrooxidation of p-dimethoxybenzene on platinum electrodes in strictly dried acetonitrile solutions was studied by in situ spectroscopic methods (UV-Vis differential reflectance, FT-IR reflectance and electron spin resonance (ESR) spectroscopies). The UV-Vis and IR spectra allowed us to i...
Proper choice of reaction conditions allows formation of either the quinone or corresponding diquinone as the major product upon treatment of 2-alkyl-1,4-dimethoxybenzenes with ceric ammonium nitrate.
Rainbow trout liver microsomes were used to study the O-demethylation and ring hydroxylation of 4-methoxyphenol (4-MP) (4-hydroxyanisole) at 11 and 25 o C by directly measuring the production of the primary metabolite hydroquinone (HQ), 4-methoxycatechol (4-MCAT), and additional metaboli...
Background: Monobenzylether of hydroquinone is used worldwide to remove residual pigment in patients with vitiligo universalis. Because of the side effects reported with this drug, the use of monobenzylether of hydroquinone has been restricted in The Netherlands. Objective: Our purpose was to ev...
Dulcin (DL), now banned, was once a widely used artificial sweetener. DL possesses an ureido group that is metabolized by direct glucuronidation in rabbit liver microsomes. Dulcin N-glucuronide (DNG) is the only type of ureido N-glucuronide known to date; ureido glucuronidation in humans has not...
Photodegradation kinetics of Monuron (3-(4-chlorophenyl)-1,1-dimethylurea) in photoreactor with immobilized and suspended TiO2 photocatalyst were studied. The effect of addition of ferric or ferrous perchlorate was investigated. Whatever the concentration of Fe(III/II) added there is no signific...
Titanium dioxide photocatalysts were prepared by a new synthesis method that involves rapid heating with short and medium exposures of the sol–gel prepared amorphous starting materials at different temperatures and calcination times (RHSE and RHME series). Samples were also synthesized using co...
The initial stages of photodegradation of three urea-based herbicides [ArNHCON(CH 3 ) 2 =(1)]: Fenuron, Monuron and Diuron have been studied using laser-flash photolysis and pulse radiolysis. Radical cations 2 are generated immediately after the laser pulse, and deprotonate to yi...
In recent years, several documented cases of transformer failures have been attributed to the presence of corrosive sulfur species in the insulating oil [1], [2]. However, all sources of corrosive sulfur in oil have not been completely identified, yet. They can be residuals from the refining pro...
A procedure was developed for preparing stilbene by thermal desulfuring of dibenzyl disulfide and dibenzyl sulfide with metals (Fe, Zn). The major product of the similar reaction of dibenzyl disulfide with copper is dibenzyl.
Pressboard is a hard and rigid board having high with excellent electrical and mechanical properties, is specifically produced for the high voltage and extra high voltage Transformer Industry. Components and insulating sheets of pressboard are used in oil-cooled power transformers and distributi...
BackgroundIn routine practice, irritable bowel syndrome (IBS) symptoms are often difficult to be relieved and impair significantly patients’ quality of life (QoL). A randomised, double‐blind, placebo‐controlled study has shown the efficacy of alverine citrate/simeticone (ACS) combination for ...
Aliment Pharmacol Ther 31, 615–624SummaryBackground Alverine citrate and simeticone combination has been used for almost 20 years in irritable bowel syndrome (IBS), but supportive scientific evidence of efficacy was limited.Aim To evaluate the efficacy of alverine citrate and simeticone combi...
A highly sensitive and selective high performance liquid chromatography-tandem mass spectrometry method was developed and validated for the quantification of alverine (ALV) and its active metabolite, para hydroxy alverine (PHA), in human plasma. For sample preparation, solid phase extraction of ...
Borate, lithium borate and borophosphate powders were synthesized by the sol–gel method. Triethyl borate, lithium methoxide, and orthophosphoric acid were used as precursors for B2O3, Li2O, and P2O5, respectively. Powders were characterized by FTIR, DTA, XRD and SEM techniques. Powders from the...
The influence of N-substituent of triethyl(indol-2-yl)borate (2) on the palladium catalyzed cross-coupling reaction was examined, and an efficiency of triethyl(1-tert-butoxycarbonylindol-2-yl)borate (2e) could be shown.
This work describes the development of a fast method for speciation analysis of triethyl‐lead and tributyl‐tin species in urine samples after in situ derivatization by tetraethyl‐ or tetrapropyl‐borate reagents. The alkylation reaction is done in the aqueous and urine medium and the less‐po...
The stoichiometry of the reaction Np(VI) + H3hedta [hedta is N-(2-hydroxyethyl)ethylenediaminetriacetate, HEDTA, anion] in a 0.05 M HClO4 solution was studied by spectrophotometry. With Np(VI) in excess, 1 mol of HEDTA reduces 4 mol of Np(VI) to Np(V). In 0.125–1.0 M HClO4 solutions (the ionic ...
The binuclear tin(IV) complex with N-(2-hydroxyethyl)ethylenediamine-N,N′,N′-triacetic acid (H4Hedtra) is synthesized. The compound is characterized by elemental analysis, thermogravimetry, and IR spectroscopy. An X-ray diffraction analysis of complex Sn(μ-Hedtra)(μ-OH)SnCl3(H2O)] · 3H2O (I...
The influence of EDTA (ethylenediaminetetraacetic acid, disodium salt) or HEDTA (N-(2-hydroxyethyl)ethylenediaminetriacetic acid, trisodium salt) on silver–copper electrodeposition from ammonium hydroxide solution was investigated. Voltammetric studies showed that silver was deposited at potent...
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