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Dielectric dispersion of polyglutamic acid solution
Author(s) -
Takashima Shiro
Publication year - 1963
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.360010207
Subject(s) - dielectric , chemistry , dispersion (optics) , relaxation (psychology) , polyglutamic acid , dielectric dispersion , dipole , viscosity , nuclear magnetic resonance , analytical chemistry (journal) , permittivity , thermodynamics , materials science , chromatography , optics , organic chemistry , physics , psychology , social psychology , biochemistry , optoelectronics
The dielectric dispersion of polyglutamic acid (PGA) was studied in the pH range of 4–9.8. Three different dispersion curves were obtained. Above pH 6.0, where PGA has a random coil configuration, the dielectric dispersion is characterized by a large dielectric increment (ca. 450) and a relaxation time of 10–12.7 × 10 −6 sec. Between pH 6.0 and 5.0, where PGA is in a transitional state with small viscosity, a dispersion curve with very small dielectric increment and also small relaxation time was observed. Below pH 5.0, where PGA has a helical configuration, the dispersion is characterized by a relaxation time of 10–12 × 10 −6 sec. and a dielectric increment of about 120. The dipole moment of coil and helical forms of PGA were calculated by using Allgen's equation, and qualitative discussions of these dielectric properties are presented.