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Electric birefringence studies on polyglutamic acid
Author(s) -
Kobayasi Syoyu,
Ikegami Akira
Publication year - 1975
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.1975.360140309
Subject(s) - birefringence , chemistry , polarizability , dipole , polyglutamic acid , kerr effect , electric field , anisotropy , helix (gastropod) , molecule , nuclear magnetic resonance , analytical chemistry (journal) , crystallography , optics , chromatography , organic chemistry , physics , ecology , biochemistry , nonlinear system , quantum mechanics , snail , biology
The electric birefringence for the aqueous solution of poly‐ L ‐glutamic acid (PGA) in the helical form was studied. PGA samples were fractionated by gel column chromatography. PGA showed a positive electric birefringence. The permanent dipole moment of the PGA molecule was suggested to be largely suppressed. The measurements of the intrinsic Kerr constants for various molecular lengths showed that the electric anisotropy (polarizability) of PGA is proportional to the 1.5 power of the length. The electric birefrigence measurement was also carried out in the helix–coil transition region. The Kerr constant of PGA was largely reduced on going from the helical form to the coiled form.