Hydrogen peroxide based

The alkene is allowed to react at low temperatures with a mixture of aqueous hydrogen peroxide, base, and a co-solvent to give a low conversion of the alkene (29). These conditions permit reaction of the water-insoluble alkene and minimise the subsequent ionic reactions of the epoxide product. Phase-transfer techniques have been employed (30). A variation of this scheme using a peroxycarbimic acid has been reported (31). 

Desulfurization using purified enzymes Investigations into enzymatic desulfurization as an alternative to microbial desulfurization has revealed several enzymes capable of the initial oxidation of sulfur. A study reported use of laccase with azino-bis-(3-ethylbenzothiazoline-6-sulfonic acid) (ABTS) as a mediator for oxidation of DBT [181]. The rate of this reaction was compared to hydrogen peroxide-based phosphotungstic acid-catalyzed oxidation and the latter was found to be about two orders of magnitude higher. The authors also oxidized diesel oil sulfur to no detectable levels via extraction of the oxidized sulfur compounds from diesel. In Table 9, the enzymes used in oxidation of DBT to DBTO are reported. 

Wang, B.Q. and Dong, S.J. (2000) Sol-gel-derived amperometric biosensor for hydrogen peroxide based on methylene green incorporated in Nafion film. Talanta, 51, 565—572. 

Freeman T.M., Seitz W.R., Chemiluminescence fiber optic probe for hydrogen peroxide based on the luminol reaction, Anal. Chem. 1978 50(9) 1242-1246. 

An advanced sensor for hydrogen peroxide based on Prussian blue... 

I.L. Mattos, L. Gorton, T. Ruzgas, and A.A. Karyakin, Sensor for hydrogen peroxide based on Prussian blue modified electrode improvement of the operational stability. Anal. Sci. 16, 1-5 (2000). 

J. Yu and H.X. Ju, Amperometric biosensor for hydrogen peroxide based on hemoglobin entrapped in titania sol-gel film. Anal. Chim. Acta 486, 209—216 (2003). 

Also, a selective sensor for hydrogen peroxide based on FIA was proposed by Janasek et al. [78], H202 can be detected in the presence of luminol and Co(II) and Cu(II) foils, obtaining linear determination ranges of 0.1-200 pmol/L and 5-200 pmol/L under FI conditions, respectively. To improve the selectivity, the CL detector was combined with a thin-layer gas dialysis cell. 

In 1994, Mansuy and coworkers found that a simple ammonium salt, like ammonium acetate alone, is a very efficient cocatalyst for the metalloporphyrin-catalyzed epoxidation of simple alkenes by hydrogen peroxide ". Bases like sodium carbonate, sodium acetate or tetrabutylammonium hydroxide turned out to promote the porphyrin-catalyzed epoxidation without any other additive. Adducts of hydrogen peroxide (with Na2C03, urea, MesNO, PhsPO), which turned out to be particularly useful for reactions in which the concentration of H2O2 in solution needs to be controlled at a fixed level, have been employed by Johnstone and coworkers. 

Bromine has also been suggested for an indirect detection process for the determination of tetracyclines in pharmaceutical formulations [155]. A bromine/hydrogen peroxide-based electrogenerated chemiluminescence reaction is shown to be enhanced by tetracycline derivatives and detection levels down to the pg dm level are reported on the basis of this enhancement effect. 

G. Palleschi, M.A. Nabi Rahni, G.J. Lubrano, J.N. Nwainbi and G.G. Guilbault, A study of interferences in glucose measurements in blood by hydrogen peroxide based glucose probes, Anal. Biochem., 159 (1986) 114-121. 

Zhang Y, Wilson GS. Electrochemical oxidation of hydrogen peroxide on platinum and platinum/iridium electrodes in physiological buffer and its applicability to hydrogen peroxide-based biosensors. Journal of Electroanalytical Chemistry 1993, 345, 253-271. 

Thus, the substituted heteropolyanion is stable and active even in the presence of oxidants such as /-BuOOH or PhIO. Note that the heteropolyanion is unstable with respect to hydrogen peroxide. Based on the high stability, TMSP can be used for alkane hydroxylation [67b]. Mansuy et al. have reported that P2Wn06i (Mn3+ Br)8 is oxidation resistant and more active for the epoxidation of cyclooctene with PhIO than those containing Fe3+, Co2+, Ni2+, or Cu2+ [68]. The oxygenations of cyclohexane, adamantane, and heptane and the hydroxylation of naphthalene, are also catalyzed by TMSP. 

However, the comparison of the data collected in Tab. 6-4 offers a realistic estimate of process efficiencies. The quantum yield of OH radical formation on Ti02 is only 4 to 10% at best. This is the major reason why Ti02 processes have, in general, not been commercially successful. Pure economic analysis (favored by Bolton) results in an estimate that hydrogen peroxide based photo-initiated AOPs are 50 to 100 times more efficient in their use of electricity than Ti02 photocata-... 

EFFECT OF pH ON BTA IN GLYCINE-HYDROGEN PEROXIDE BASED Cu CMP SLURRY... 

Although the mitochondria are the primary site of oxidation for dietary and storage fats, the peroxisomal oxidation pathway is responsible for the oxidation of very long-chain fatty acids, jS-methyl branched fatty acids, and bile acid precursors. The peroxisomal pathway also plays a role in the oxidation of dicarboxylic acids. In addition, it plays a role in isoprenoid biosynthesis and amino acid metabolism. Peroxisomes are also involved in bile acid biosynthesis, a part of plasmalogen synthesis and glyoxylate transamination. Furthermore, the literature indicates that peroxisomes participate in cholesterol biosynthesis, hydrogen peroxide-based cellular respiration, purine, fatty acid, long-chain... 

Jonsson, G. and Gorton, L. (1989) An electrochemical sensor for hydrogen-peroxide based on peroxide adsorbed on a spectrographic graphite electrode. Electroanalysis, 1 (5), 465 468. 

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