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Nuclear magnetic resonance spectroscopy: Reinvestigation of carbon-13 spin-lattice relaxation time measurements of amino acids

Pearson, Harry and Gust, Devens and Armitage, Ian M. and Huber, Hanspeter and Roberts, John D. and Stark, Ruth E. and Vold, Regitze R. and Vold, Robert L. (1975) Nuclear magnetic resonance spectroscopy: Reinvestigation of carbon-13 spin-lattice relaxation time measurements of amino acids. Proceedings of the National Academy of Sciences of the United States of America, 72 (4). pp. 1599-1601. ISSN 0027-8424. http://resolver.caltech.edu/CaltechAUTHORS:PEApnas75

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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.


Item Type:Article
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.
Subject Keywords:carbon-13 nuclear magnetic resonance; paramagnetic metal ions; 13C relaxation times; glycine nuclear magnetic resonance
Record Number:CaltechAUTHORS:PEApnas75
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:PEApnas75
Alternative URL:http://www.pnas.org/cgi/content/abstract/72/4/1599
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:8575
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:21 Aug 2007
Last Modified:26 Dec 2012 09:40

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