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学科主题: Chemistry; Oceanography
题名: Probing molecular-level transformations of dissolved organic matter: insights on photochemical degradation and protozoan modification of DOM from electrospray ionization Fourier transform ion cyclotron resonance mass spectrometry
作者: Kujawinski, EB ; Del Vecchio, R ; Blough, NV ; Klein, GC ; Marshall, AG
关键词: ESI FT-ICR MS ; FT-MS ; DOM ; fulvic acids ; photochemistry ; protozoan grazing
刊名: MARINE CHEMISTRY
发表日期: 2004-01-01
卷: 92, 期:1-4, 页:23-37
部门归属: Columbia Univ Barnard Coll, Dept Environm Sci, New York, NY 10027 USA; Univ Maryland, ESSIC, College Pk, MD 20742 USA; Univ Maryland, Dept Chem & Biochem, College Pk, MD 20742 USA; Florida State Univ, Dept Chem & Biochem, Tallahassee, FL 32306 USA; Florida State Univ, Ion Cyclotron Resonance Program, Natl High Magnet Field Lab, Tallahassee, FL 32310 USA
英文摘要: Molecular-level characterization of natural organic matter (NOM) has been elusive due to the inherent complexity of natural organic mixtures and to the fact that individual components are often polar and macromolecular. Electrospray ionization (ESI) is a "soft" ionization technique that ionizes polar compounds from aqueous solution prior to injection into a mass spectrometer. The highest resolution and mass accuracy of compounds within NOM have been achieved when ESI is combined with an ultrahigh-resolution mass spectrometer such as the Fourier transform ion cyclotron resonance mass spectrometer (FT-ICR MS). With this technique, individual molecules within a variety of natural organic mixtures can be detected and their elemental composition can be determined. At low mass-to-charge (m/z) ratio, the resolution is high enough to assign exact molecular formulas allowing specific components of these mixtures to be identified. In addition to molecular identification, we can now use ESI FT-ICR MS to examine molecular-level changes in different organic mixtures as a function of relevant geo-processes, such as microbial alterations and photochemistry. Here we present the results from the application of ESI FT-ICR MS to two geochemical questions: (1) the effect of photoirradiation on the molecular composition of fulvic acids and (2) the role of protozoan grazers in the modification of DOM in aquatic systems. (C) 2004 Elsevier B.V. All rights reserved.
语种: 英语
原文出处: 查看原文
内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/9382
Appears in Collections:海洋微食物网高被引文献_期刊论文

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Kujawinski, EB; Del Vecchio, R; Blough, NV; Klein, GC; Marshall, AG.Probing molecular-level transformations of dissolved organic matter: insights on photochemical degradation and protozoan modification of DOM from electrospray ionization Fourier transform ion cyclotron resonance mass spectrometry,MARINE CHEMISTRY,2004,92(1-4):23-37
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