Abstract
The 13C spin-lattice relaxation times, T1's, of several amino acids have been measured as a function of pD and concentration. A strong dependence of the carboxyl carbon T1 was observed for both pD and concentration and is believed to be due to intermolecular associations. For the carboxyl carbon, spin rotation is proposed as the predominant relaxation mechanism, whereas the other carbons are relaxed mainly by the dipole-dipole mechanism, and their relaxation times are relatively independent of changes in concentration and pD.
Keywords: progressive saturation
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Selected References
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- Allerhand A., Komoroski R. A. Study of internal rotations in gramicidin S by means of carbon-13 spin-lattice relaxation measurements. J Am Chem Soc. 1973 Dec 12;95(25):8228–8231. doi: 10.1021/ja00806a003. [DOI] [PubMed] [Google Scholar]
- Deslauriers R., Garrigou-Lagrange C., Bellocq A. M., Smith U. C. Carbon-13 nuclear magnetic resonance studies on thyrotropin-releasing factor and related peptides. FEBS Lett. 1973 Apr 1;31(1):59–66. doi: 10.1016/0014-5793(73)80073-0. [DOI] [PubMed] [Google Scholar]
- Deslauriers R., Walter R., Smith I. C. Intramolecular motion in peptide determined by 13C NMR: a spin-lattice relaxation time-study on MSH-release-inhibiting factor. FEBS Lett. 1973 Nov 15;37(1):27–32. doi: 10.1016/0014-5793(73)80419-3. [DOI] [PubMed] [Google Scholar]