Nuclear magnetic resonance spectroscopy cross-polarization

Preston, C.,Trofymow, J., Sayer, B., and Niu, J. (1997). 13C nuclear magnetic resonance spectroscopy with cross-polarization and magic-angle spinning investigation of the proximate-analysis fractions used to assess litter quality in decomposition studies. Can. J. Bot. 75, 1601-1613. 

Wilson, M. A., Barron, P.F., and Goh,K.M. (1981b). Differences in structure of organic-matter in 2 soils as demonstrated by l3C cross polarization Nuclear magnetic-resonance spectroscopy with magic angle spinning. Geoderma 26, 323-327. 

Cross Polarization/Magic Angle Spinning Nuclear Magnetic Resonance Spectroscopy... 

Kaflak-Hachulska A (2000) The study of bone mineral using nuclear magnetic resonance spectroscopy with cross-polarization. PhD thesis. Medical University of Warsaw... 

Nuclear Overhauser effect (NOE), the transfer of spin polarization from one spin population to another by cross-relaxation in nuclear magnetic resonance spectroscopy. The NOE in, e.g., NOESY spectra can be used to derive distance information between two nuclei in a molecule and, hence, serves as a tool for structure elucidation. 

Solid state nuclear magnetic resonance spectroscopy (NMR), e.g. [107-109]. This technique is sensitive to the local environment of certain nuclei, their mobility and orientation [108]. It provides information about the heterogeneity of polymer blends to c. 5 nm or less (spin diffusion experiments) or c. 0.3 nm in cross-polarization experiments, from which the direct (averaged) distance between two types of nuclei in a sample can be determined [107,108]. Motions of moleuclar groups in a polymer chain can be analyzed and correlations with dispersion areas in the mechanical spectra may be possible [109]. Solid state NMR is not a standard technique at the present time but it is becoming increasingly important. 

Sfihi, H., Quinton, M.F., Legrand, A., Pregermain, S., Carson, D., Chiche, P. Evaluation of the aromaticity in French coals by C- H cross polarization, magic angle spinning and dipolar dephasing nuclear magnetic resonance spectroscopy Fuel, 65,1006 (1986)... 

CROSSED POLARIZATION AND MAGIC ANGLE SPINNING NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY (CP/MAS NMR)... 

In our work CP/MAS C-NMR (Cross-Polarization Magic Angle Spurning Carbon-13 Nuclear Magnetic Resonance) spectroscopy togefiier wifii spectral fitting has been the method used for stud3dng interactions between cellulose I and hemicelluloses. A necessary prerequisite for this approach is a reliable interpretation of cellulose I spectra. 

Preston C.M., Sayer B.G. What s in a nutshell an investigation of structure by carbon-13 cross-polarization magic-angle spinning nuclear magnetic resonance spectroscopy. Journal of Agricultural and Food Chemistry, 40 206-210 (1992). 

Both of these methods have been used for DOM isolation from major rivers and the surface ocean, and the general characteristics of these fractions of DOM are presented in Table I. The major C functional groups of humic substances and ultrafiltered DOM (UDOM) have been characterized by solid-state, cross-polarization magic angle spinning 13C nuclear magnetic resonance (NMR) spectroscopy. The samples of humic substances that were characterized by NMR spectroscopy were collected from the Amazon River... 

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