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Dielectric changes in hyaluronate solutions at microwave frequencies as a function of concentration, system pH, and temperature
Author(s) -
Jani S. K.,
Dahiya J. N.,
Roberts J. A.
Publication year - 1980
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.1980.360190415
Subject(s) - chemistry , dielectric , permittivity , dissipation factor , aqueous solution , microwave , microwave cavity , analytical chemistry (journal) , hyaluronic acid , refractive index , ionic liquid , chromatography , optics , organic chemistry , materials science , quantum mechanics , physics , optoelectronics , biology , genetics , catalysis
The dielectric response of human umbilical cord hyaluronic acid in various environments has been studied at microwave frquencies using a resonant microwave cavity as a probe. Both the real and imaginary parts of complex dielectric constant and the loss tangent for hyaluronate solutions are obtained by utilizing equations for perturbation of a resonant cavity. Dielectric changes at room temperature have been observed in aqueous solutions of hyaluronic acid as a function of concentration ranging from 0 to 350 mg/ml. The data indicate the existence of ordered phases in hyaluronate solutions at selective concentrations, that is, exhibiting lyotropic‐type transitions. Hyaluronate solutions at 1.5 and 3 mg/ml concentrations have been studied at various pH in the range of 6–8 and at constant ionic strength 0.1. A temperature‐dependent transition in hyaluronate solution of 120 mg/ml concentration has been observed at physiological temperature. It is shown that this temperature‐dependent behavior can be related to the orientational polarizability term in the Debye theory of polar molecules in liquids.