Published April 1, 1975
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Journal Article
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Nuclear magnetic resonance spectroscopy: Reinvestigation of carbon-13 spin-lattice relaxation time measurements of amino acids
Abstract
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.
Additional Information
© 1975 by the National Academy of Sciences. Contributed by John D. Roberts, December 1, 1974. This research was supported at the California Institute of Technology by the Public Health Service, Research Grant GM-11072, from the Institute of General Medical Sciences and the National Science Foundation, and at the University of California, San Diego by the Public Health Service, Research Grant RR-00708, and by the National Science Foundation. This paper is Contribution no. 5082 from the Gates and Crellin Laboratories of Chemistry.Files
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