气候变化领域集成服务门户(CCPortal): Relating Paramagnetic Properties to Molecular Parameters of Humic Acids Isolated from Permafrost Peatlands in the European Arctic

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DOI	10.3390/molecules29010104
	Relating Paramagnetic Properties to Molecular Parameters of Humic Acids Isolated from Permafrost Peatlands in the European Arctic
	Lodygin, Evgeny; Vasilevich, Roman; Abakumov, Evgeny
发表日期	2024
EISSN	1420-3049
起始页码	29
结束页码	1
卷号	29 期号:1
英文摘要	Free radicals (FRs) are intermediate participants in the transformation process of soil organic matter, and free radical activity is a fundamental property of humic substances. The aim of this work was to conduct a comparative study of the paramagnetic properties of humic acids (HAs) isolated from Histosols by electron paramagnetic resonance (EPR) spectroscopy. The studied Histosols are found in permafrost peatlands in four natural geographic subzones of the European Arctic (from forest tundra to northern tundra). The results obtained showed that in anaerobic conditions on the peatlands in the tundra zone, the formation of semiquinone-type radicals occurs through the reduction of quinone fragments of HAs and leads to an increase in the concentration of paramagnetic centres within HAs. PCA analysis allowed us to reveal relationships between the properties of the initial raw peat samples, the molecular composition of the isolated HAs, and their paramagnetic parameters. It was found that FR localization occurs predominantly on aromatic fragments of lignin nature, which are confined to the low molecular weight fraction of HAs. The g-factor values of the EPR spectra of HAs indicate the presence of carbon- and oxygen-centred FRs in the HA structure, with a predominance of the latter.
英文关键词	soil organic matter; free radicals; EPR spectroscopy; Histosols
语种	英语
WOS研究方向	Biochemistry & Molecular Biology ; Chemistry
WOS类目	Biochemistry & Molecular Biology ; Chemistry, Multidisciplinary
WOS记录号	WOS:001140408500001
来源期刊	MOLECULES
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/296301
作者单位	Russian Academy of Sciences; Institute of Biology, Komi Scientific Centre, Ural Branch RAS; Komi Science Centre of the Ural Branch of the Russian Academy of Sciences; Saint Petersburg State University
推荐引用方式 GB/T 7714	Lodygin, Evgeny,Vasilevich, Roman,Abakumov, Evgeny. Relating Paramagnetic Properties to Molecular Parameters of Humic Acids Isolated from Permafrost Peatlands in the European Arctic[J],2024,29(1).
APA	Lodygin, Evgeny,Vasilevich, Roman,&Abakumov, Evgeny.(2024).Relating Paramagnetic Properties to Molecular Parameters of Humic Acids Isolated from Permafrost Peatlands in the European Arctic.MOLECULES,29(1).
MLA	Lodygin, Evgeny,et al."Relating Paramagnetic Properties to Molecular Parameters of Humic Acids Isolated from Permafrost Peatlands in the European Arctic".MOLECULES 29.1(2024).