TY - JOUR
T1 - Characterization of a major refractory component of marine dissolved organic matter
AU - Hertkorn, Norbert
AU - Benner, Ronald
AU - Frommberger, Moritz
AU - Schmitt-Kopplin, Philippe
AU - Witt, Matthias
AU - Kaiser, Karl
AU - Kettrup, Antonius
AU - Hedges, John I.
N1 - Funding Information:
The authors gratefully acknowledge a Humboldt research award for J.I.H., funding from the U.S. NSF for R.B. and K.K., and valuable discussions with K. Whitehead, Th. Dittmar, B. Koch, E. M. Perdue and Y. Gelinas. We thank H. Neumeir, E. Holzmann and S. Thaller (GSF) for skillful technical assistance during measurements and preparation of the manuscript.
PY - 2006/6/15
Y1 - 2006/6/15
N2 - Refractory carboxyl-rich alicyclic molecules (CRAM) are characterized in marine dissolved organic matter (DOM) using nuclear magnetic resonance spectroscopy and ultrahigh resolution mass spectrometry. CRAM are distributed throughout the water column and are the most abundant components of deep ocean DOM ever characterized. CRAM are comprised of a complex mixture of carboxylated and fused alicyclic structures with a carboxyl-C:aliphatic-C ratio of 1:2 to 1:7. CRAM are expected to constitute a strong ligand for metal binding, and multiple coordination across cations could promote aggregation and marine gel formation thereby affecting CRAM reactivity and the bioavailability of nutrients and trace metals. It appears CRAM are ultimately derived from biomolecules with structural similarities to sterols and hopanoids. The occurrence of CRAM in freshwater and terrestrial environments seems likely, considering the global distribution of biomolecules and the similarities of biogeochemical processes among environments.
AB - Refractory carboxyl-rich alicyclic molecules (CRAM) are characterized in marine dissolved organic matter (DOM) using nuclear magnetic resonance spectroscopy and ultrahigh resolution mass spectrometry. CRAM are distributed throughout the water column and are the most abundant components of deep ocean DOM ever characterized. CRAM are comprised of a complex mixture of carboxylated and fused alicyclic structures with a carboxyl-C:aliphatic-C ratio of 1:2 to 1:7. CRAM are expected to constitute a strong ligand for metal binding, and multiple coordination across cations could promote aggregation and marine gel formation thereby affecting CRAM reactivity and the bioavailability of nutrients and trace metals. It appears CRAM are ultimately derived from biomolecules with structural similarities to sterols and hopanoids. The occurrence of CRAM in freshwater and terrestrial environments seems likely, considering the global distribution of biomolecules and the similarities of biogeochemical processes among environments.
UR - http://www.scopus.com/inward/record.url?scp=33744792327&partnerID=8YFLogxK
U2 - 10.1016/j.gca.2006.03.021
DO - 10.1016/j.gca.2006.03.021
M3 - Article
AN - SCOPUS:33744792327
SN - 0016-7037
VL - 70
SP - 2990
EP - 3010
JO - Geochimica et Cosmochimica Acta
JF - Geochimica et Cosmochimica Acta
IS - 12
ER -
