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17O-NMR. of Enriched Acetic Acid, Glycine, Glutamic Acid and Aspartic Acid in Aqueous Solution. II. Relaxation Studies

✍ Scribed by Ioannis P. Gerothanassis; Roger Hunston; Jürgen Laulenvein

Publisher
John Wiley and Sons
Year
1982
Tongue
German
Weight
607 KB
Volume
65
Category
Article
ISSN
0018-019X

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✦ Synopsis

Abstract

The ^17^O‐NMR. line widths of the enriched amino acids glycine, aspartic acid, glutamic acid and, for comparative reasons, acetic acid were measured in aqueous solution between pH 1 and 14. The ^17^O‐NMR. line‐width maxima of glycine at pH≈︁11 and acetic acid at pH≈︁5 are shown to arise from traces of paramagnetic metal ions. The increase in line width in case of glycine on going from the zwitterion 10 the cataion is attributed to an increase in the ^17^O‐quadrupole coupling constant. No evidence for an intermolecular or intramolecular association of glycine in the zwitterionic form was found. When the paramagnetic impurities were eliminated by addition of EDTA, both the longitudinal and transverse relaxation times remained unchanged on deprotonation of the amino group. The overlapping of the α, β‐ and α, γ‐carboxyl resonances of aspartic and glutamic acid, respectively, created difficulties for their line‐width analysis.

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