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29Si and 13C NMR spectra of trimethylsilylated amino acids

✍ Scribed by Jan Schraml; Magdalena Kvíčalová; Iveta Schwarzová; Jan Velíšek

Publisher
John Wiley and Sons
Year
1994
Tongue
English
Weight
395 KB
Volume
32
Category
Article
ISSN
0749-1581

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✦ Synopsis

Abstract

The ^29^Si and ^13^C NMR chemical shifts are reported for trimethylsilyl derivatives of 25 amino acids, the majority of which occur naturally as protein constituents of foodstuffs. The ^29^Si chemical shifts in trimethylsilyl esters of amino acids roughly correlate linearly with the p__K__ values of the parent amino acid. No such simple correlations were found for the shifts in the fully trimethylsilylated amino acids. The ^29^Si chemical shifts of various functionalities encountered fall into distinct spectral regions, but the shifts of (CH~3~)~3~SiN or (CH~3~)~3~SiOOC groups alone are not sufficiently characteristic to identify the acid but their combination is in most cases.

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