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Far-infrared spectra of sequential copolymers of amino acids with alkyl group side chains

✍ Scribed by Koichi Itoh; Hiroaki Katabuchi

Publisher: Wiley (John Wiley & Sons)
Year: 1972
Tongue: English
Weight: 524 KB
Volume: 11
Category: Article
ISSN: 0006-3525
DOI: 10.1002/bip.1972.360110806

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✦ Synopsis

Far-infrared spectra were measured for the sequential copolymers of amino acids with alkyl group side chains. The analysis of the spectra showed that (LAla-LAla-Gly),, (LAl*Gly),, (LAla-Gly-Gly),, (LVal-L-Ala-L-Ala),, and (L-Val-LAla), have the antiparallel pleated sheet structures and that the backbone conformations of (I.-Val-LVal-L Ma), and (L-Val-LVal-Gly), are the same as that of poly-Lvaline. The far-infrared bands characteristic of the antiparallel pleated sheet structure were assigned on the basis of the result of the normal coordinate analysis of poly-Lalanine with this structure. The intersheet and interchain spacings of the sequential copolymers with the antiparallel pleated sheet structure were determined from the x-ray powder-diffraction patterns of these samples.

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