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Electric birefringence studies on polyglutamic acid

✍ Scribed by Syoyu Kobayasi; Akira Ikegami

Book ID
101716204
Publisher
Wiley (John Wiley & Sons)
Year
1975
Tongue
English
Weight
474 KB
Volume
14
Category
Article
ISSN
0006-3525

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✦ Synopsis

Abstract

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.

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