Nuclear magnetic resonance spectroscopy: reinvestigation of carbon-13 spin-lattice relaxation time measurements of amino acids.
AUTOR(ES)
Pearson, H
RESUMO
The carbon-13 spin-lattice relaxation times (T1) of glycine have been measured as a function of pD and concentration. Contrary to previously reported findings, no significant dependence was observed on either pD or concentration. In addition, the T1 values reported here are much longer than those published earlier. The discrepancies arise from the presence of paramagnetic impurities in the earlier samples. For the carboxyl carbon, dipole-dipole relaxation is dominant in both D2O and H2O solution, and in H2O there is a significant intermolecular dipolar contribution. Proton and oxygen relaxation times have also been measured. These, along with the carbon relaxation data, allow a discussion of the dynamics of glycine in solution.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=432585Documentos Relacionados
- Nuclear Magnetic Resonance Spectroscopy. Carbon-13 Spin-Lattice Relaxation Time Measurements of Amino Acids
- Evaluation of PHB/Clay nanocomposite by spin-lattice relaxation time
- Deuterium off-resonance rotating frame spin-lattice relaxation of macromolecular bound ligands.
- Natural-Abundance Carbon-13 Fourier-Transform Nuclear Magnetic Resonance Spectra and Spin Lattice Relaxation Times of Unfractionated Yeast Transfer-RNA*
- Spin-lattice relaxation of laser-polarized xenon in human blood