The application of 1H high-resolution magic-angle spinning NMR for the study of clay-organic associations in natural and synthetic complexes

Langmuir : the ACS Journal of Surfaces and Colloids
André J SimpsonBrian P Kelleher

Abstract

The preferential sorption of model compounds to calcium-exchanged montmorillonite surfaces was investigated using 1H high-resolution magic-angle spinning (HR-MAS) and liquid-state NMR. Synthetic mixtures, representing the major structural categories abundant in natural organic matter (NOM), and two soil extracts were sorbed to montmorillonite. The NMR spectra indicate that, of the organic components observable by 1H HR-MAS NMR, aliphatic components preferentially sorb to the clay surface, while carbohydrates and amino acids mainly remain in the supernatant. These results may help explain the highly aliphatic nature of organic matter associated with clay fractions in natural soils and sediments. Investigations using the synthetic mixtures demonstrate a specific interaction between the clay surface and the polar region in 1-palmitoyl-3-stearoyl-rac-glycerol. Similar observations were obtained with natural soil extracts. The results presented have important implications for understanding the role of organoclay complexes in natural processes, and provides preliminary evidence that HR-MAS NMR is a powerful analytical technique for the investigation of organoclay complex structure and conformation.

References

May 16, 2000·Solid State Nuclear Magnetic Resonance·R E StarkJ R Garbow
Jun 6, 2002·Die Naturwissenschaften·André J SimpsonMartin Hofmann
Feb 5, 2003·Environmental Science & Technology·André J SimpsonPatrick G Hatcher
Oct 22, 2003·Phytochemistry·Ashish P DeshmukhPatrick G Hatcher
Jan 28, 2004·Magnetic Resonance in Chemistry : MRC·Andre J SimpsonBrian Kelleher

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Citations

May 3, 2012·Journal of Chemical Ecology·Myrna J Simpson, André J Simpson
Aug 23, 2012·Environmental Science & Technology·Andre J SimpsonRonald Soong
Oct 22, 2010·Doklady Biological Sciences : Proceedings of the Academy of Sciences of the USSR, Biological Sciences Sections·T V AlekseevaYu G Kolyagin
Aug 28, 2009·Environmental Science & Technology·Sang Soo LeePaul Fenter
Jul 12, 2008·Langmuir : the ACS Journal of Surfaces and Colloids·Sang Soo LeeKathryn L Nagy
Mar 15, 2011·Progress in Nuclear Magnetic Resonance Spectroscopy·André J SimpsonMyrna J Simpson
Aug 30, 2008·Environmental Science & Technology·Azadeh ShirzadiAndré J Simpson
Sep 1, 2017·Langmuir : the ACS Journal of Surfaces and Colloids·Régis GuéganSylvian Cadars
Sep 5, 2021·Progress in Nuclear Magnetic Resonance Spectroscopy·Esperanza Pavón, María D Alba
Mar 3, 2007·Environmental Science & Technology·Andre J SimpsonMichael H B Hayes

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