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Hydration of pectic polysaccharides
Author(s) -
Ryden P.,
MacDougall A. J.,
Tibbits C. W.,
Ring S. G.
Publication year - 2000
Publication title -
biopolymers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.556
H-Index - 125
eISSN - 1097-0282
pISSN - 0006-3525
DOI - 10.1002/1097-0282(200011)54:6<398::aid-bip40>3.0.co;2-g
Subject(s) - swelling , chemistry , polyelectrolyte , polysaccharide , counterion , salt (chemistry) , ionic strength , ionic bonding , polymer chemistry , chemical engineering , ion , biophysics , organic chemistry , aqueous solution , polymer , engineering , biology
The hydration and swelling of pectic polysaccharides was examined at different pHs and ionic strengths as a function of osmotic stress. For weakly charged pectic polysaccharides at low concentrations of a monovalent salt (20 m M ), the main driving force for swelling originates from a polyelectrolyte effect due to the translational entropy of ions within the film. Swelling is reduced at higher salt concentrations and lower pHs. Polyelectrolyte collapse and minimal swelling is observed for more highly charged pectic polysaccharides. Replacement of the Na + counterion with Ca 2+ results in minimal swelling and the formation of network structures even for the weakly charged pectic polysaccharides. © 2000 John Wiley & Sons, Inc. Biopoly 54: 398–405, 2000