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Titolo:
The application of multidimensional NMR to the study of soil humic substances
Autore:
Kingery, WL; Simpson, AJ; Hayes, MHB; Locke, MA; Hicks, RP;
Indirizzi:
Mississippi State Univ, Dept Plant & Soil Sci, Mississippi State, MS 39762USA Mississippi State Univ Mississippi State MS USA 39762 State, MS 39762USA Univ Birmingham, Sch Chem, Birmingham B15 2TT, W Midlands, England Univ Birmingham Birmingham W Midlands England B15 2TT W Midlands, England Univ Limerick, Sch Chem & Environm Sci, Limerick, Ireland Univ Limerick Limerick Ireland h Chem & Environm Sci, Limerick, Ireland USDA ARS, So Weed Sci Res Unit, Stoneville, MS 38776 USA USDA ARS Stoneville MS USA 38776 d Sci Res Unit, Stoneville, MS 38776 USA Mississippi State Univ, Dept Chem, Mississippi State, MS 39762 USA Mississippi State Univ Mississippi State MS USA 39762 State, MS 39762 USA
Titolo Testata:
SOIL SCIENCE
fascicolo: 6, volume: 165, anno: 2000,
pagine: 483 - 494
SICI:
0038-075X(200006)165:6<483:TAOMNT>2.0.ZU;2-0
Fonte:
ISI
Lingua:
ENG
Soggetto:
MAGNETIZATION TRANSFER;
Keywords:
humic substances; multidimensional NMR spectroscopy; molecular structures; TOCSY; HMQC;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
25
Recensione:
Indirizzi per estratti:
Indirizzo: Kingery, WL Mississippi State Univ, Dept Plant & Soil Sci, Box 9555, Mississippi State, MS 39762 USA Mississippi State Univ Box 9555 Mississippi State MS USA 39762
Citazione:
W.L. Kingery et al., "The application of multidimensional NMR to the study of soil humic substances", SOIL SCI, 165(6), 2000, pp. 483-494

Abstract

Humic substances are the most abundant organic macromolecules in soils, and comprehension of their chemical structure is essential to understanding their role in terrestrial ecosystems. The one-dimensional nuclear magnetic resonance (NMR) spectroscopy techniques now used widely to study humic substances have provided important insight into humic structures, but the complexity of these macromolecules gives rise to resonance signals that are broadand have spectral overlap. This has prevented the definitive functional group assignments necessary for structural determination, Hence, interest hasfocused on more powerful two-dimensional NMR experiments, such as the homonuclear TOtal Correlation SpectroscopY (TOCSY) and Heteronuclear Multiple Quantum Coherence (HMQC), which were employed in the study of a soil humic acid standard. The purpose of this paper is to outline the potential of these techniques to the study of soil humic structures. The 2-D spectra produced were extremely encouraging, with multitudes of cross-peaks produced from both TOCSY and HMQC experiments. The identification of fatty ester/acid chains and amino acid couplings are given as examples. Results obtained with these NMR experiments indicate substantial improvements in functional group assignment capabilities and the potential for marked progress in the determination of the chemical structure of soil humic substances.

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Documento generato il 25/11/20 alle ore 15:52:56