Reduction of quinone and non-quinone redox functional groups in different humic acid samples by Geobacter sulfurreducens

被引：72

作者：

Hernandez-Montoya, Virginia ^{[4
]}

Alvarez, Luis H. ^{[3
]}

Montes-Moran, Miguel A. ^{[2
]}

Cervantes, Francisco J. ^{[1
,3
]}

机构：

[1] Norwegian Univ Sci & Technol NTNU, Dept Biotechnol, N-7491 Trondheim, Norway

[2] CSIC, Inst Nacl Carbon, E-33080 Oviedo, Spain

[3] IPICyT, Div Ciencias Ambientales, San Luis Potosi 78216, Slp, Mexico

[4] Inst Tecnol Aguascalientes, Dept Ingn Quim, Aguascalientes 20256, Ags, Mexico

来源：

GEODERMA | 2012年 / 183卷

关键词：

Humic acids; Microbial humus reduction; Quinones; Electron transferring capacity; DISSOLVED ORGANIC-MATTER; ELECTRON-ACCEPTORS; SPECTROSCOPIC CHARACTERIZATION; FLUORESCENCE SPECTROSCOPY; REDUCING MICROORGANISMS; SUBSTANCES; SOILS; RESPIRATION; OXIDATION; METHANOGENESIS;

D O I：

10.1016/j.geoderma.2012.03.007

中图分类号：

S15 [土壤学];

学科分类号：

0903 ; 090301 ;

摘要：

Humic substances constitute the most abundant organic fraction in the biosphere, which have extensively been studied for more than 200 years; however, much remains unknown regarding their structure and properties. In the present study, 12 different samples of humic acids (HA) were extracted from a wide diversity of organic rich environments, including soil from different forests and plantations, and were characterized based on their elemental composition, carboxyl and phenolic content, FTIR spectra and their electron transferring capacities (ETCs). The total ETCs determined in a H-2/Pd reaction system greatly varied (112-392 mu mol g(-1)) depending on the origin of the organic bulk material. Further analysis indicated that non-quinone (NQ) redox functional groups in HA accounted for an important fraction (25-44%) of the total quantified ETCs. Results derived from the present study constitute the first demonstration that humus-reducing microorganisms are capable of reducing both quinone and NQ redox functional groups in different HA samples and expand our understanding on the microbial reduction of humic substances. (C) 2012 Elsevier B.V. All rights reserved.

引用

页码：25 / 31

页数：7

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