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

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	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
	Kujawinski, EB ; Del Vecchio, R ; Blough, NV ; Klein, GC ; Marshall, AG
刊名	MARINE CHEMISTRY
	2004
卷号	92 期号:1-4 页码:23-37
关键词	ESI FT-ICR MS FT-MS DOM fulvic acids photochemistry protozoan grazing
ISSN号	0304-4203
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.
学科主题	Chemistry; Oceanography
原文出处	ELSEVIER SCIENCE BV
语种	英语
公开日期	2012-02-13
内容类型	期刊论文
源URL	[http://ir.scsio.ac.cn/handle/344004/9382]
专题	南海海洋研究所_海洋微食物网高被引文献
推荐引用方式 GB/T 7714	Kujawinski, EB,Del Vecchio, R,Blough, NV,et al. 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[J]. MARINE CHEMISTRY,2004,92(1-4):23-37.
APA	Kujawinski, EB,Del Vecchio, R,Blough, NV,Klein, GC,&Marshall, AG.(2004).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,92(1-4),23-37.
MLA	Kujawinski, EB,et al."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 92.1-4(2004):23-37.