Tetrahedron p. 2165 - 2182 (1982)
Update date:2022-08-04
Topics:
Leibfritz, Dieter
Haupt, Erhard
Dubischar, Norbert
Lachmann, Heinrich
Oekonomopulos, Raymond
Jung, Guenther
The uncommon amino-acid 2-methylalanine (α-aminoisobutiryc acid, Aib) was investigated by 13C-NMR.The chemical shifts of amino- or carboxy-protected derivates of Aib and of protected oligopeptides are discussed with respect to neighbouring groups and amino acids.The pH-dependence of the 13C-NMR spectra of Aib, Aib-Ala, Ala-Aib, Aib-Ala-Aib and Aib-Ala-Aib-Ala-Aib was studied.Using these examples, a new and advantageous method is demonstrated for the first time for the evaluation of NMR titration curves, which uses so-called chemical shift diagrams (CS diagrams).
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