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The natural abundance 15N nmr spectra of linear polysarcosine (DP = 35) has been recorded in Me2SO and H2O solution. Because of cis/trans isomerization at the peptide bond, a broad signal with several splittings was observed. These splittings appear to reflect the influence of three peptide bonds on a single N atom. The 15N signals from the sequence polypeptides (β‐Ala‐Sar‐Gly)n and (β‐Ala‐Sar‐D,L‐Ala)n also show a cis/trans splitting, as well as chemical shifts which are dependent on the peptide sequence. The tertiary nitrogen of the sarcosyl residue has a T1 relaxation time which is longer than the T1 for secondary nitrogens of the other amino acids. The nuclear Overhauser effect is also discussed.
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Kricheldorf et al. (1977) studied this question.
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