Efficient Production of Reactive Oxidants by Atmospheric Bacterial-Derived Organic Matter in the Aqueous Phase.

ABSTRACT: Hydroxyl radicals (•OH), singlet oxygen (¹O₂*), and organic triplet excited states (³C*) play key roles as oxidants ("reactive intermediates (RIs)") in forming and oxidizing aqueous organic aerosols. Bioaerosols are ubiquitous in the atmosphere, but little is known about their photochemical behavior and contributions to atmospheric photochemistry. We investigated the photochemical behavior of aqueous-phase cellular organic matter (COM) and extracellular polymeric substances (EPS) from cultured bacteria isolated from atmospheric PM_2.5, focusing on their photochemical production of ³C*, ¹O₂*, and •OH. The molecular size and aromaticity of chromophores and fluorophores in COM and EPS increased with molecular weight (

SUBMITTER: Liu Y 

PROVIDER: S-EPMC12709572 | biostudies-literature | 2025 Apr

REPOSITORIES: biostudies-literature