APPLICATION OF QUADRUPOLAR XE-131-NMR RELAXATION TO THE STUDY OF MACROMOLECULAR SYSTEMS

摘要

Xe-131-NMR longitudinal relaxation rates have been measured by the inversion recovery method for xenon in presence of lecithin vesicles or a small protein charybdotoxin. The transverse relaxation rates in the same spectra have been obtained by spectral deconvolution. The results show that xenon in lecithin vesicles is in a rapid exchange between free and bound sites and that averaging of the electric-field gradient at the Xe nucleus is a two-step process. From these results, estimates have been obtained for the parameters entering the Xe-131 quadrupolar interaction. (C) 1996 John Wiley & Sons, Inc. [References: 16]