globalchange  > 气候变化与战略
DOI: 10.1029/2019GB006225
论文题名:
Sargassum sp. Act as a Large Regional Source of Marine Dissolved Organic Carbon and Polyphenols
作者: Powers L.C.; Hertkorn N.; McDonald N.; Schmitt-Kopplin P.; Del Vecchio R.; Blough N.V.; Gonsior M.
刊名: Global Biogeochemical Cycles
ISSN: 0886-6236
EISSN: 1944-9224
出版年: 2019
卷: 33, 期:11
语种: 英语
英文关键词: biochemical composition ; brown alga ; dissolved organic carbon ; FTIR spectroscopy ; marine ecosystem ; mass spectrometry ; nuclear magnetic resonance ; phenolic compound ; seawater ; Sargassum ; Sargassum natans ; Sargassum sp.
学科: DOC ; FT-ICR MS ; marine dissolved organic matter ; marine polyphenols ; NMR ; Sargassum
中文摘要: Dissolved organic carbon (DOC) plays critical roles in marine carbon cycling, but its sources and sinks remain uncertain. In this study, we monitored DOC exudation rates of Sargassum natans under visible light (λ > 390 nm) and solar radiation. DOC release rates ranged from 7 to 10 μg C g−1 biomass hr−1 (wet weight) under visible light, but increased to 23 to 41 μg C g−1 biomass hr−1 when exposed to natural sunlight. Results indicate that DOC released by Sargassum could amount to 0.3 to 1.2 Tg C/year, potentially contributing significantly to the marine DOC pool in the Gulf of Mexico and Western North Atlantic. We employed the Folin-Ciocalteu phenolic content method, nuclear magnetic resonance (NMR) spectroscopy, and ultrahigh resolution Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS) to characterize the diverse pool of organic compounds exuded from Sargassum. Results from these complementary methods showed that Sargassum release large quantities of phlorotannins, a class of polyphenols that have very similar properties to terrestrial DOC. These phlorotannins and their oxygenated phenolic derivatives exhibit a high hydrogen deficiency and functionalization (i.e., 4 to 6 oxygen atoms per aromatic ring), representing 5 to 18% of the released DOC isolated by solid phase extraction. Thus, Sargassum is the largest biological source of open ocean polyphenols recorded to date. The amount of polyphenolic DOC released by Sargassum challenges previous beliefs that all polyphenols found within the oceans are remnants of terrestrial organic matter, although the stability of phlorotannins and their derivatives needs to be further evaluated. © 2019. American Geophysical Union. All Rights Reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/160091
Appears in Collections:气候变化与战略

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作者单位: University of Maryland Center for Environmental Science, Chesapeake Biological Laboratory, Solomons, MD, United States; Helmholtz Zentrum Muenchen–German Research Center for Environmental Health, Research Unit Analytical BioGeoChemistry, Neuherberg, Germany; Bermuda Institute of Ocean Sciences, St. George's, Bermuda; GEOMAR Helmholtz Centre for Ocean Research, Kiel, Germany; Chair of Analytical Food Chemistry, Technische Universität München, Weihenstephan, Germany; Earth System Science Interdisciplinary Center, University of Maryland, College Park, MD, United States; Department of Chemistry and Biochemistry, University of Maryland, College Park, MD, United States

Recommended Citation:
Powers L.C.,Hertkorn N.,McDonald N.,et al. Sargassum sp. Act as a Large Regional Source of Marine Dissolved Organic Carbon and Polyphenols[J]. Global Biogeochemical Cycles,2019-01-01,33(11)
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