Abstract
The speaker demonstrates that gelatin at pH > 4.7 combines only with cations and at pH < 4.7 only with anions, while at the isoelectric point (pH = 4.7) it combines with neither anion nor cation.
He shows further that the curves representing the influence of monovalent anions or cations upon the swelling, osmotic pressure and viscosity of gelatin are always approximately parallel with the curves representing the amount of anion or cation found in chemical combination with the gelatin.
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