Diesel Soot — Catalyzed Production of Reactive Oxygen Species: Cooperative Effects with Bisulfite
نویسندگان
چکیده
The fragmentation of KMB (4-(methylthio)-2-oxobutyric acid) as an indicator reaction for the production of strong oxidants is catalyzed by diesel soot particles in the light. This reaction operates also in the dark and can be strongly stimulated by the addition of sulfite. The cooperative activity of diesel soot particles (DP) and sulfite also bleaches the carotenoid crocin. This molecule represents a model for both the groups of plant pigments as well as polyene structures embedded as flexible backbones in cellular membranes. Enhanced chemiluminescence generated by linolenic acid in the presence of either ter/-butylhydroperoxide or hydrogenperoxide is detected in the presence of both DP and H SO ,'. Luminescence originates from singlet oxygen or chemically excited molecules such as triplet ketones and is thus a valuable indicator for peroxidation of lipids involved in membrane damage. All reactions were inhibited by SOD (superoxide dismutase) whereas catalase had no effect.
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