✦ LIBER ✦

An infrared study on the conformation of poly-L-proline in concentrated aqueous salt solutions

✍ Scribed by Charles A. Swenson

Publisher: Wiley (John Wiley & Sons)
Year: 1971
Tongue: English
Weight: 341 KB
Volume: 10
Category: Article
ISSN: 0006-3525
DOI: 10.1002/bip.360101218

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✦ Synopsis

The infrared absorption of poly-L-proline in concentrated aqueous salt solutions was measured in the fundanierital region. Of primary interest were the carbonyl absorption of the peptide linkage and the methylene C-H bending absorption of the pyrrolidine ring. These spectral regions each show an additional component in the concentrated salt solutions. Using the position of the absorptions of poly-L-proline I (cis) and I1 (frans) as models, we conclude that both cis-trans linkages are present in the peptide in salt solutions. Increasing the temperature shifts the equilibrium slightly in favor of cis.

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