H2O2 HYDROGEN PEROXIDE

In addition to the hydrides of formula HjX, oxygen forms the hydride H2O2, hydrogen peroxide, and sulphur forms a whole series of hydrides called sulphanes. These are yellow liquids which are thermodynamically unstable with respect to hydrogen sulphide and sulphur. 

H2O2 (hydrogen peroxide) chirality, 80 symmetry elements, 82 NF3 (nitrogen trifluoride) dipole moment, 98, 99 NFl3 (ammonia)... 

There are several other routes to acetone of minor importance air oxidation of IPA reaction between IPAand acrolein for the production of allyl alcohol, with acetone as the by-product vapor phase oxidation of butane coproduction when IPA is oxidized yielding acetone and H2O2, hydrogen peroxide, the principal ingredient of bleach and by-product production from the manufacture of methyl ethyl ketone. 

Pathways in the synthesis and metaboiism of dopamine. The metaboiism of dopamine produces hydrogen peroxide, which can be converted to water by giutathione peroxidase (GPX) or can in the presence of iron produce reactive hydroxyi radicais. DOPA, dihydroxyphenyiaianine DA, dopamine MTA, 3-methoxytyramine DOPAC, dihydroxyphenyi acetic acid HVA, homovaniiiic acid GPX, giutathione peroxidase H2O2, hydrogen peroxide. 

C>2 anion superoxide —H2O2 hydrogen peroxide OH hydroxyl radical... 

Fig. 3. Suggested schematic pathways involved in dopaminergic neurons CAT, catalase GPx, glutathione peroxidase GR, glutathione reductase MAO, monoamine oxidase SOD, superoxide dismu-tase GSH and GSSG, reduced and oxidized glutathione, respectively Oj, superoxide HO, hydroxyl radical H2O2, hydrogen peroxide. (After P15.)...

One of the main functions of peroxisomes is to detoxify the cell by splitting hydrogen peroxide. They contain the enzyme catalase. Catalase converts H2O2 (hydrogen peroxide, a toxic by-product of cellular metabolism) to H2O and O2, with 4H202 4H2O-I-2O2. Peroxisomes also degrade fatty acids and toxic compounds and catalyze the first two steps required in the synthesis of ether-linked phospholipids (which are later used to build membranes) and sterols. In addition, it plays a role in isoprenoid biosynthesis and amino acid metabolism. 

Fig-1 Biochemical relationships of the reactive species in the mitochondrial matrix. QH ubiquinol, Qff ubisemiquinone, Q ubiquinone, NO nitric oxide, N0 nitroxyl anion, O2 molecular oxygen, Oy superoxide anion radical, ONOO peroxynitrite, H2O2 hydrogen peroxide, HO hydroxyl radical... 

Hydrogen Peroxide (H2O2). Hydrogen peroxide can be prepared by the reaction of barium peroxide and sulfuric acid (see equation 13). As barium sulfate precipitates out, hydrogen peroxide is easily separated. 

FIGURE I Free radical interactions with lipoproteins or cells. LO, Lipoxygenase O j, superoxide anion ONOO", peroxynitrite H2O2, hydrogen peroxide XO, xanthine oxidase NO, nitric oxide NOS, nitric oxide synthase. 

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