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Li, S. ; Harir, M. ; Bastviken, D.* ; Schmitt-Kopplin, P. ; Gonsior, M.* ; Enrich-Prast, A.* ; Valle Das Neves, J. ; Hertkorn, N.

Dearomatization drives complexity generation in freshwater organic matter.

Nature 628, 776-781 (2024)
Publ. Version/Full Text DOI PMC
Open Access Gold (Paid Option)
Creative Commons Lizenzvertrag
Dissolved organic matter (DOM) is one of the most complex, dynamic and abundant sources of organic carbon, but its chemical reactivity remains uncertain1-3. Greater insights into DOM structural features could facilitate understanding its synthesis, turnover and processing in the global carbon cycle4,5. Here we use complementary multiplicity-edited 13C nuclear magnetic resonance (NMR) spectra to quantify key substructures assembling the carbon skeletons of DOM from four main Amazon rivers and two mid-size Swedish boreal lakes. We find that one type of reaction mechanism, oxidative dearomatization (ODA), widely used in organic synthetic chemistry to create natural product scaffolds6-10, is probably a key driver for generating structural diversity during processing of DOM that are rich in suitable polyphenolic precursor molecules. Our data suggest a high abundance of tetrahedral quaternary carbons bound to one oxygen and three carbon atoms (OCqC3 units). These units are rare in common biomolecules but could be readily produced by ODA of lignin-derived and tannin-derived polyphenols. Tautomerization of (poly)phenols by ODA creates non-planar cyclohexadienones, which are subject to immediate and parallel cycloadditions. This combination leads to a proliferation of structural diversity of DOM compounds from early stages of DOM processing, with an increase in oxygenated aliphatic structures. Overall, we propose that ODA is a key reaction mechanism for complexity acceleration in the processing of DOM molecules, creation of new oxygenated aliphatic molecules and that it could be prevalent in nature.
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Publication type Article: Journal article
Document type Scientific Article
Corresponding Author
Keywords Valley Polarization; Mos2; Superconductivity; Valleytronics; Realization; Monolayer; Graphene; Pulses; Model
ISSN (print) / ISBN 0028-0836
e-ISSN 1476-4687
Journal Nature
Quellenangaben Volume: 628, Issue: 8009, Pages: 776-781 Article Number: , Supplement: ,
Publisher Nature Publishing Group
Publishing Place London
Non-patent literature Publications
Reviewing status Peer reviewed
Institute(s) Research Unit Analytical BioGeoChemistry (BGC)
Grants CAPES (Probal)
CNPq
CNPq (Universal and Ciencias sem Fronteiras)
FAPERJ (Cientista do Nosso Estado)
Chinese Scholarship Council
European Research Council ERC
Swedish Research Council (VR)
Swedish Research Council for Sustainable Development, FORMAS
Alexander von Humboldt Foundation