NDLI: Unveiling the molecular composition of the unextractable soil organic fraction (humin) by humeomics

Content Provider	Springer Nature Link
Author	Nebbioso, Antonio Vinci, Giovanni Drosos, Marios Spaccini, Riccardo Piccolo, Alessandro
Copyright Year	2015
Abstract	We applied humeomics to a soil unextractable humin fraction (HUM1) and its derived humin (HUM2) after removal of minerals by an HF/HCl treatment. Humeomics implies progressive separation and structural characterization of molecules released from complex humin matrices as (i) unbound, (ii) weakly ester-bound, (iii) strongly ester-bound, and (iv) ether-bound. Molecular characterization of fractions was achieved by GC-MS, thermochemolysis-GC-MS, and 13C-CPMAS-NMR. Both weight and chromatographic yields were higher for the clay-depleted HUM2 than those for HUM1, and this increased molecular detection in HUM2. Saturated and unsaturated alkanoic, α,ω-alkanedioic, hydroxyalkanoic acids, alkanols, and hydrocarbons were found in both HUM1 and HUM2. Abundant odd-C numbered n-alkanoic acids in unbound fractions indicated accumulation of free microbial metabolites, whereas plant-derived acids remained in fractions more tightly bound to the humin matrix. Unsaturated, n-alkanedioic, and hydroxyalkanoic acids were detected after hydrolysis of complex esters. The aromatic character in humin residues progressively increased with humeomics sequential steps, while alkyl and hydroxy-alkyl compounds were reduced. Humins contained similar components as a humic acid extracted from the same soil, implying that traditional humic pools differed in supramolecular arrangement rather than in molecular composition. The humeomic approach enables the determination of the molecular composition of humic matter and may improve knowledge of the structure-activity relations of organic matter in soil.
Starting Page	443
Ending Page	451
Page Count	9
File Format	PDF
ISSN	01782762
Journal	Biology and Fertility of Soils
Volume Number	51
Issue Number	4
e-ISSN	14320789
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2015-01-20
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Soil Humin Humeomics GC-MS Pyrolysis NMR Thermochemolysis Agriculture Soil Science & Conservation
Content Type	Text
Resource Type	Article
Subject	Agronomy and Crop Science Soil Science Microbiology

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