Alternatives to the ‘water oxidation pathway’ of biological ozone formation

Journal of Chemical Biology

Arnold N. Onyango¹ 

[1] Department of Food Science and Technology, Jomo Kenyatta University of Agriculture and Technology, P. O. Box 62000, 00200 Nairobi, Kenya

关键词: Ozone;    Singlet oxygen;    Hydrogen peroxide;    Amino acid oxidation;    Baeyer-Villiger oxidation;   

DOI  :  10.1007/s12154-015-0140-6

学科分类：分子生物学，细胞生物学和基因

来源: Springer

【 摘 要 】

Recent studies have shown that ozone (O3) is endogenously generated in living tissues, where it makes both positive and negative physiological contributions. A pathway for the formation of both O3 and hydrogen peroxide (H2O2) was previously proposed, beginning with the antibody or amino acid-catalyzed oxidation of water by singlet oxygen (1O2) to form hydrogen trioxide (H2O3) as a key intermediate. A key pillar of this hypothesis is that some of the H2O2 molecules incorporate water-derived oxygen atoms. However, H2O3 decomposes extremely readily in water to form 1O2 and water, rather than O3 and H2O2. This article highlights key literature indicating that the oxidation of organic molecules such as the amino acids methionine, tryptophan, histidine, and cysteine by 1O2 is involved in ozone formation. Based on this, an alternative hypothesis for ozone formation is developed involving a further reaction of singlet oxygen with various oxidized organic intermediates. H2O2 having water-derived oxygen atoms is subsequently formed during ozone decomposition in water by known reactions.

【 授权许可】

Unknown