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The circular dichroism spectrum of poly‐ L ‐acetoxyproline
Author(s) -
Bovey F. A.,
Hood F. P.
Publication year - 1967
Publication title -
biopolymers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.556
H-Index - 125
eISSN - 1097-0282
pISSN - 0006-3525
DOI - 10.1002/bip.1967.360051005
Subject(s) - circular dichroism , chemistry , isomerization , solvent , polymer , crystallography , spectral line , stereochemistry , proline , vibrational circular dichroism , organic chemistry , amino acid , biochemistry , catalysis , physics , astronomy
We report the circular dichroism (CD) spectrum of poly‐ L acetoxyproline in trifluoroethanol, a solvent in which the form I to form II conformational isomerization occurs slowly enough to permit observation of the spectral changes. A comparison is made to poly‐ L proline. As judged by the similarity of the CD spectra, the conformations of the corresponding forms of the two polymers must be nearly the same. Transition assignments are proposed; these are shown to agree with the theoretical calculations of Pysh. There is a serious unexplained discrepancy between our solution data and those of Fasman for poly‐ L acetoxyproline.