Premium
Distorted α‐helix for poly (γ‐benzyl L ‐glutamate) in the nematic solid stale
Author(s) -
Samulski E. T.,
Tobolsky A. V.
Publication year - 1971
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.360100607
Subject(s) - liquid crystal , helix (gastropod) , dichloromethane , chemistry , chloroform , phase (matter) , crystallography , liquid crystalline , side chain , stereochemistry , polymer , organic chemistry , materials science , solvent , ecology , snail , biology , optoelectronics
Abstract A strong magnetic field has been utilized to orient the liquid crystalline phase of concentrated polypeptide solutions enabeling the preparation of nematic solid films. The uniaxially oriented nematic films are suitable for x‐ray studies of the polypeptide backbone chain conformation. A distorted α‐helix with 3.5 residues per turn is observed in nematic films of the L ‐isomer of poly (benzyl glutamate) when the film is cast from chloroform. The normal α‐helix (3.6 residues per turn) is found in similarly prepared films cast from dichloromethane.