The accumulation of metabolites can be traced and quantified by the intensities of 13C NMR peaks. Therefore, 13C NMR spectroscopy can be used as a valuable tool to investigate human lens carbohydrate metabolism non-interventionally.doi:10.1002/jccs.198900046Ugur Camli...
Carbon 13 NMR Theory of NMR The positively charged nuclei of certain elements (e.g., 13C and 1H) behave as tiny magnets. In the presence of a strong external magnetic field (Bo), these nuclear magnets align either with ( ) the applied field or opposed to ( ) the applied field. ...
Rapid sample spinning of these compounds causes the nematic director to align along the spinning axis, resulting in narrow peaks in the C-13 NMR spectra. The 2D method of SLF produces a first order splitting pattern for each carbon signal, from which C-H dipolar coupling constants can be ...
The experimental observable consists of the 13C resonance peaks in the carbonyl region of the NMR spectrum for the protein. The ratio of the peak intensities in the presence and absence of the off-resonance rf field is related to both the Zeeman spin-lattice relaxation rate (1/T1) and to ...
Why carbon-13 FT NMR spectra cannot be phasedIt is commonly observed that in spite of repeated cycles of applying zero- and firstorder phase corrections to absorption-mode carbon-13 FT NMR spectra, the spectra still possess what appears to be a residual dispersion-mode component at random ...
On the assignment of the carbon‐13 NMR spectrum of bilirubin An individual assignment of certain peaks in the proton and 13C NMR spectra of bilirubin and of bilirubin dimethyl ester is described. The assignment was achieved through the spectra of vinylneoxanthobilirubinic acid and by off-...
The determination of these five compounds including β-naphthol in a mixture was done by measuring the intensities of their C2 peaks. The NMR method was applied to a sulfonation process of β-naphthol. G-acid has been proved to be the only major product in the sulfonation reaction in ...
300 cm−1.13C solid-state NMR was therefore performed to show the presence of carbon (Fig. 2b). Interestingly, the resonance appears around 125 p.p.m., similar to that of reduced graphene oxide/graphite27, which corresponds tosp2carbons with an electron density very similar to graphite...
3d, characteristic chemical shifts of 13C-NMR spectra at 102.6, 128.3, 126.8, 144.0, 142.6, and 140.7 ppm are in accordance with that of 2,3-DAPN demonstrated by previous publications (see Supplementary Fig. 4)30. Among the 13C-NMR spectra, peaks located at 144.0, 142.6, 140.7 ppm ...
Fine structure in the solution state 13C-NMR spectrum of C60 and its endofullerene derivatives The 13C NMR spectrum of fullerene C60 in solution displays two small ``side peaks" on the shielding side of the main 13C peak, with integrated intensities of 1.63\\% and 0.81\\% of the main ...