IMPLICATIONS OF OMEGA-OXOCARBOXYLIC ACIDS IN THE REMOTE MARINE ATMOSPHERE FOR PHOTOOXIDATION OF UNSATURATED FATTY-ACIDS
IMPLICATIONS OF OMEGA-OXOCARBOXYLIC ACIDS IN THE REMOTE MARINE ATMOSPHERE FOR PHOTOOXIDATION OF UNSATURATED FATTY-ACIDS
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DOI：
10.1038/325330a0
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发表时间：
1987-01-22
期刊：
影响因子：
64.8
通讯作者：
GAGOSIAN, RB
中科院分区：
文献类型：
--
作者：
KAWAMURA, K;GAGOSIAN, RB
特定的有机化合物被用作海洋大气中生物和人为来源输入的示踪剂1-8。这种示踪剂方法利用海洋和陆地植物各种脂类化合物的独特分子特征或指纹来确定气溶胶中有机物质的来源。然而，这些物质中的许多都不稳定，会发生转化反应。例如，不饱和脂肪酸是海洋和陆地植物的主要成分，但在遥远的海洋气溶胶3、6、7中并未经常检测到。不饱和脂肪酸在大气中转化的机制尚未阐明。本文报道了在海洋气溶胶中发现了一系列同源的ω-氧羧酸(C4-C14，C9最多)。我们认为这些化合物是海洋环境中不饱和脂肪酸的氧化产物。ω-氧酸的发现，加上气溶胶、海水和降雨中单羧酸和双羧酸的额外数据，使我们假设了海洋大气和表层海水中不饱和脂肪酸的光诱导氧化反应机制。
Specific organic compounds have been used as tracers of biological and anthropogenic source inputs to the marine atmosphere1–8. This tracer approach uses the unique molecular signatures or fingerprints for various lipid compound classes of marine and terrestrial plants to identify the sources of the organic substances in aerosols9. However, many of these substances are not stable and undergo transformation reactions. For example, unsaturated fatty acids, which are major constituents of marine and terrestrial plants, have not been frequently detected in remote marine aerosols3,6,7. The mechanism for the transformation of unsaturated fatty acids in the atmosphere has not been elucidated. In this paper, we report the discovery of a homologous series of ω-oxocarboxylic acids (C4–C14; C9being maximum) in marine aerosols. We propose that these compounds are oxidation products of unsaturated fatty acids in the marine environment. The discovery of ω-oxoacids, along with additional aerosol, sea water, and rain data for mono- and di-carboxylic acids, has led us to postulate a photo-induced oxidative reaction scheme for unsaturated fatty acids in the marine atmosphere and surface seawater.