Abstract
Summary The use of superconducting solenoids in 13C NMR can result in a substantial increase in spectral resolution over that obtained at commonly employed magnetic fields. Results are presented here for the cyclic decapeptide gramicidin S in both CD3OD and DMSO-d6 solutions. It was possible to monitor the complete motional behavior of the side chains of gramicidin S in CD3OD using 13C spin lattice relaxation times. Preliminary data are reported which confirm the frequency dependence of spin-lattice relaxation times for carbons in molecules not satisfying the extreme narrowing condition.
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