Peroxides removal

However, an important problem arises during the peroxidative removal of phenols from aqueous solutions PX is inactivated by free radicals, as well as by oligomeric and polymeric products formed in the reaction, which attach themselves to the enzyme (Nazari and others 2007). This suicide peroxide inactivation has been shown to reduce the sensitivity and efficiency of PX. Several techniques have been introduced to reduce the extent of suicide inactivation and to improve the lifetime of the active enzyme, such as immobilization. Moreover, Nazari and others (2007) reported a mechanism to prevent and control the suicide peroxide inactivation of horseradish PX by means of the activation and stabilization effects of Ni2+ ion, which was found to be useful in processes such as phenol removal and peroxidative conversion of reducing substrates, in which a high concentration of hydrogen peroxide may lead to irreversible enzyme inactivation. 

Hydrogen peroxide Removal of interferences by anion and cation resin, luminol CL, rainwater 35 nM 46... 

Palmitic acid, 69 o-Pelargonylphenol, 58 P-Pelaigonylphenol, 58 Pentaacetyl d-CLUcononitrile, 14,74 2,4-PENTANEDIONE, 6 Pentose synthesis, 14 Perkin reaction, 55 Peroxide, removal, 95 Perphthalic acid, mono-, 70... 

Polyethylene glycol. May be contaminated with aldehydes and peroxides, removing interfering species. [Ray and Purathingal AB 146 307 1985]. 

The aerial oxidation of solutions of complexes (330) has been investigated. Chromatography separation led to the identification of products which underwent dehydrogenation of the ethylene bridge (Scheme 31).2413 Such dehydrogenation reactions are inhibited by fluoroalkyl substituents and enhanced by alkyl substituents. Oxidation with hydrogen peroxide removes the ethylene bridge. 

The work of H. C. Brown has made hydroboration an enormously useful synthetic reaction. Oxidation of the adduct with alkaline hydrogen peroxide removes the boron smoothly without rearrangement and replaces it by a hydroxy group. The oxidation proceeds entirely with retention of configuration. For example, the product of Reaction 7.19 is converted by oxidation to trans-2-methylcyclopentanol in high yields (Equation 7.20). 

Hydrogen peroxide removes mold in a less toxic way. Make sure you are protecting yourself while using it. See www.mold-removal. biz/ mold-removal-1101.htm. 

Catalase Aspergillus niger Shelf life improvement of food Milk preservation Hydrogen peroxide removal... 

Trifluoroethanol46 Hydrogen peroxide Removal of sulfur-containing impurities... 

Tetrahydrofuran54 Alkaline hydrogen peroxide Removal of methacrolein impurity... 

Octene was mixed with the dirhenium heptoxide catalyst (0.1 mol % to 2 mol % based of olefin), cooled, and the oxidizing solution (in the reagent ratio range of 1 2 to 1 14 olefin/peroxide) added. After the reaction was complete, the reaction was filtered, cooled, unreacted peroxide removed by addition of sodium sulfite, and desiccant added to remove water. The product was isolated by vacuum distillation. 

In the first step (equation 1), peroxide removes two electrons from the protein. One derives from iron and another from an organic group, R, giving the well-known compound 1. Compound 1 thus has two fewer electrons than the native enzyme. In most peroxidases, the oxidized organic group is the porphyrin leading to a porphyrin tt-cation radical. However, in cytochrome c peroxidase (CcP), a tryptophan residue rather than the porphyrin is oxidized. ... 

Shertzer, H. G. and Tabor, M. W. Peroxide removal from organic solvents and vegetable oils.. Environ. Sci. Health, A20 845-855, 1985. 

Figure 2. Sodium hydroxide consumption in a standard oxidation of methyl a-D-glucopyranoside over Ti-MCM-41 with hydrogen peroxide ( ), removal of the heterogeneous catalyst after Ih and further reaction of the solution ( ) and upon re-use of the solid catalyst ( ).

Sodium lactate Traces of copper and iron precipitated as sulfide excess sulfide oxidized to sulfate with hydrogen peroxide excess peroxide removed by activated carbon. 

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