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Charge effects in the sedimentation of polyelectrolytes
Author(s) -
Ziccardi Robert,
Schumaker Verne
Publication year - 1971
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.360100922
Subject(s) - polyelectrolyte , electrolyte , chemistry , sedimentation , ionic strength , dilution , charge (physics) , ammonium chloride , ammonium , charge density , thermodynamics , chemical physics , chemical engineering , organic chemistry , polymer , physics , aqueous solution , sediment , paleontology , electrode , quantum mechanics , engineering , biology
The theory for sedimentation of macromolecular polyelectrolytes in solutions of low‐ionic strength has been modified for the case of a supporting low molecular weight electrolyte possessing a partial specific volume close to unity. The final equations simplify greatly, allowing sedimentation data to be plotted in a linear fashion. These data then may be readily extrapolated to infinite dilution, yielding a value, S o , simply related to size and shape. From the initial slope of such plots, the net charge on the macro‐molecular polyelectrolyte may be determined. It is suggested that tetramethyl‐ammonium chloride may prove to be a satisfactory supporting electrolyte for such studies.