a semi-quantitative characterization of the predominant organic chemical structures and to compare the organic matter from permanently and seasonally flooded peatlands soils as well as to characterize the changes throughout the soil profile using principal component analysis (PCA) of 13C-SSNMR spectra....
The 13C-based multi-dimensional ssNMR approaches have been instrumental in revealing information on plant cell walls in their native environment. However, the requirement of enriching plants with 13C to obtain 2D and 3D correlation spectra needed for adequate analysis limits the applicability of these...
The protocol does not require large amounts of 13 CO 2 .This study shows that our 13 C-labeling of plant materials can make the accessibility to ssNMR technique easy and affordable. The derived high-resolution 2D and 3D correlation spectra are used to extract structural information of plant ...
Solid-state NMR (SSNMR) method... CP Jaroniec,BA Tounge,J Herzfeld,... - Springer Netherlands 被引量: 33发表: 2001年 SPAM-MQ-HETCOR: an improved method for heteronuclear correlation spectroscopy between quadrupolar and spin-1/2 nuclei in solid-state NMR. The recently introduced concept of ...
However, the structural studies of proteins by ssNMR are usually prolonged or impeded by signal assignments, especially the assignments of signals for collection of distance restraints, because of serious overlapping of signals in 2D 13 C– 13 C spectra. Sparse labeling of 13 C spins is an ...
In this study, the utility of 13C solid-state nuclear magnetic resonance spectroscopy (SSNMR) in characterizing the phase properties of pharmaceutical lipids was investigated. Variable temperature 13C SSNMR spectra and spin-lattice relaxation times (T1C) were obtained for high-purity oleic acid (OA...
The process of obtaining sequential resonance assignments for heterogeneous polypeptides and large proteins by solid-state NMR (ssNMR) is impeded by extensive spectral degeneracy in these systems. Even in these challenging cases, the cross peaks are not distributed uniformly over the entire spectral wid...
For paramagnetic systems, however, because of the large shift dispersion, insufficient 1 H or 1 H- 1 HRF decoupling with the limited RF fields available in a conventional probe typically results in severe loss of resolution in 1 H and 13 C SSNMR spectra. Also, large paramagnetic shifts mask...
Raman and 13C ssNMR spectra were collected and subjected to partial-least-squares and principle component regressions after mathematical treatment of the data. The model performance parameters such as root-mean-square error of prediction, standard error of prediction, and bias were low for Raman ...
Solid-state nuclear magnetic resonance (SSNMR) has been used for detailed structural investigations of the chicken, tinamou, and flamingo eggshell materials. 31P NMR spectra reveal that hydroxyapatite and β-tricalcium phosphate in the ratio 3:2 represent major constituents of phosphate species in ...