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Occurrence of β‐chain conformation in poly‐γ‐methyl glutamate membranes
Author(s) -
Nakajima Akio,
Fujiwara Takashi,
Hayashi Toshio,
Kaji Keisuke
Publication year - 1973
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.1973.360121205
Subject(s) - chemistry , formic acid , membrane , optical rotatory dispersion , trifluoroacetic acid , triple helix , polymer , helix (gastropod) , polymer chemistry , chain (unit) , organic chemistry , crystallography , stereochemistry , circular dichroism , biochemistry , ecology , physics , astronomy , snail , biology
Molecular chain conformations of poly‐γ‐methyl‐ L ‐glutamate, poly‐γ‐methyl‐ D ‐glutamate, and poly‐γ‐methyl‐ D , L ‐glutamate in membranes prepared by using mainly trifluoroacetic acid and formic acid as solvents were investigated by infrared, X‐ray diffraction, and optical rotatory dispersion measurements. It was pointed that these polymers exist in the α‐helix form in membranes cast from trifluoroacetic acid solutions, but in the β‐chain form in membrances swollen in formic acid. The β‐chain structure was also observed in crystals precipitated from dilute solutions including formic acid. The formation of the β‐chain structure was discussed.