The solution conformational properties of the opiate agonist-antagonist pairs morphinc+nalorphine and oxymorphoncwmloxone have been investigated by NMR spectroscopy of their salts and free bases in aqueous and uon-aqueous solutions, respectively. Nitrogen inversion in the piperidine ring takes place
Conformations of side chains of somatostatin very high field proton NMR studies
β Scribed by David H. Live; Donald G. Davis; William C. Agosta; David Cowburn
- Publisher
- John Wiley and Sons
- Year
- 1982
- Tongue
- English
- Weight
- 425 KB
- Volume
- 19
- Category
- Article
- ISSN
- 0749-1581
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β¦ Synopsis
Abstract
The high field proton NMR spectra (500 and 600 MHz) of the peptide hormone somatostatin in D~2~O are reported. The results obtained are used to derive values of the couplings and chemical shifts related to the solution conformation of several of the side chains. This work resolves a discrepancy in the literature concerning the assignments of resonances in the spectrum. It also provides a means of testing the accuracy of obtaining values for these couplings and shifts in previous 2D NMR studies at lower field from strongly coupled multiplets in spectra of this complexity.
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