Data/hora: 20/06/2024 03:53:50

Biblioteca(s): | Embrapa Solos.
Data corrente: | 10/01/2007
Data da última atualização: | 20/10/2021
Autoria: | SIMPSON, A. J.; SONG, G.; SMITH, E.; LAM, B.; NOVOTNY, E. H.; HAYES, M. H. B.
Afiliação: | ANDRE J. SIMPSON, UNIVERSITY OF TORONTO; GUIXUE SONG, UNIVERSITY OF LIMERICK; EMMA SMITH, UNIVERSITY OF TORONTO; BUUAN LAM, UNIVERSITY OF TORONTO; ETELVINO HENRIQUE NOVOTNY, CNPS; MICHAEL H. B. HAYES, UNIVERSITY OF LIMERICK.
Título: | Unraveling the structural components of soil humin by use of solution-state nuclear magnetic resonance spectroscopy.
Ano de publicação: | 2007
Fonte/Imprenta: | Environmental Science & Technology, v. 41, n. 3, p. 876-883, Feb. 2007.
DOI: | https://doi.org/10.1021/es061576c
Idioma: | Inglês
Conteúdo: | Humin is the most recalcitrant and least understood fraction of soil organic matter. By definition, humin is that fraction not extracted by traditional aqueous alkaline soil extractants. Here we show that >_70% of the traditional humin fraction is solubilized when 0.1 M NaOH + 6 M urea and dimethyl sulfoxide (DMSO) + 6% H2SO4 are used in series after conventional extraction. Multidimensional solution-state NMR is applied in this study to gain an understanding of the major constituents present in these "solubilized humin fractions". The spectra indicated strong contributions from five main categories of components, namely. peptides, aliphatic species, carbohydrates, peptidoglycan, and lignin. Diffusion edited spectroscopy indicated that all species are present as macromolecules (or stable aggregate species). Although the distribution of the components is generally similar, peptidoglycan is present at significant levels supporting a higher microbial contribution to humin than to humic and fulvic fractions. The abundance of plant- and microbial-derived materials found does not exclude "humic" materials (e.g., oxidized lignin) or the presence of novel compounds at lower concentrations but suggests that a large proportion of humin is formed from classes of known compounds and parent biopolymers.
Palavras-Chave: | Organic polymers.
Thesaurus Nal: | Biopolymers; Carbohydrates; Peptides; Proteins; Soil.
Categoria do assunto: | P Recursos Naturais, Ciências Ambientais e da Terra
Registro original: | Embrapa Solos (CNPS)
Exemplares: | CNPS - (12740-1) - UPC - AP - DD -  -  - 2008.00003 - DIS