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Rheological characteristics of proanthocyanidin polymers from Pinus radiata . I. Rheological behavior of water‐soluble extract fractions and phlobaphenes
Author(s) -
Kim Seungrok,
Mainwaring David E.
Publication year - 1995
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1995.070560804
Subject(s) - rheology , pinus radiata , aqueous solution , dissolution , chemical engineering , viscosity , colloid , polyelectrolyte , polymer , chemistry , sonication , proanthocyanidin , materials science , chromatography , organic chemistry , botany , composite material , engineering , biology , polyphenol , antioxidant
The rheological characteristics of the solutions of the whole extracts and their fractions from the Pinus radiata bark were investigated. The viscosity changes upon addition of aqueous NaOH solution into the solutions of the hot water extracts are due mainly to the dissolution of the phlobaphene fraction. The polyelectrolyte character was established from the solutions of the hot‐water extracts. The kinetics of the size growth of naturally forming phlobaphenes could be observed by photon correlation spectroscopy (PCS) from the solutions of hot‐water extracts. Mild sonication could degrade phlobaphenes partly and this indicates that the formation of phlobaphenes is partly associated with colloidal interaction. © 1995 John Wiley & Sons, Inc.