Download e-book for kindle: Atmospheric Oxidation and Antioxidants, Vol. 1 by Gerald Scott

By Gerald Scott

ISBN-10: 0444896155

ISBN-13: 9780444896155

Oxidation through molecular oxygen is likely one of the such a lot virtually very important of all chemical procedures. it's the foundation of power construction in animals and, even as, an incredible reason behind irreversible deterioration and supreme demise. guy makes use of oxygen absolutely within the creation of power by means of combustion, and plenty of vital commercial tactics within the petrochemical are in line with the managed oxidation of hydrocarbons. whilst, oxidation is the most explanation for deterioration of foodstuffs and of many business polymers. it really is of significant sensible significance that the mechanisms of oxidation and its prevention will be understood which will make the most of the reactions of oxygen extra successfully yet, both vital, to manage the antagonistic results of oxygen on man-made items and in organic platforms. the 3 volumes of this paintings are directed in the direction of those ambitions. even though complementary to each other, the 3 volumes shape a unmarried complete and it truly is was hoping that, by way of widespread cross-reference, readers might be enabled to make use of principles and adventure from different disciplines to enlighten their very own. quantity 1 experiences present figuring out of autoxidation, mostly at the foundation of the reactions of oxygen with characterized chemical substances. From this flows the fashionable mechanism of antioxidant activities and their program in stabilization know-how.

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Extra resources for Atmospheric Oxidation and Antioxidants, Vol. 1

Sample text

7,1964, p. 1095. U. F. ), Oxidation of Organic Compounds, Adv. in Chem. , 1968, p. 296. R. L. ), Polymer Stabilisation, Wiley Interscience, New York, 1965, p. 330 et seq. 81 G. Scott, Atmospheric Oxidation and Antioxidants, First edition, Elsevier, London and New York, 1965, p. 330 et seq. B. , New York, 1965, p. 249 et seq. 83 G. Scott, Atmospheric Oxidation and Antioxidants, First edition, Elsevier, London and New York, 1965, p. 402 et seq. 84 G. Scott, Atmospheric Oxidation and Antioxidants, First edition, Elsevier, London and New York, 1965, p.

Since that time the antioxidant function of a-tocopherol has been widened and deepened and there are now probably few biochemists who would not admit the fundamental importance of Vitamin E as a biological antioxidant in the lipids in vivo [179]. Of equal importance, however, has been the recognition of the same kind of synergism between a-tocopherol and other important constituents of the human diet, namely ascorbic acid, selenium and glutathione. Tappel [180] was able to link the antioxidant chemistry of these compounds with the synergism exhibited by these antioxidants in vitro.

The key intermediates in oxidation by molecular oxygen are alkyl and alkylperoxyl radicals and the first isolable products of oxida­ tion, the hydroperoxides (see Scheme 5). From this follows the two main mechanisms of antioxidant action: the chain-breaking and the preventive [1961. CB—A CB—D ROO RO-+OH CB—D PEROXIDE DECOMPOSITION (PD) METAL DEACTIVATION (MD) UV ABSORPTION (UVA) -ROOH RH A, h*/,M + /M 2 + Scheme 5. Mechanism of autoxidation and the role of antioxidants. Initiation is normally by reaction of hydroperoxides to give free radicals.

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Atmospheric Oxidation and Antioxidants, Vol. 1 by Gerald Scott


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