Non-ion-exchange sorption of tyrosine and tryptophan on AV-17-2P anionite

The non-ion-exchange sorption of tyrosine and tryptophan from hydrochloric solutions at temperatures of 293 and 343 K on a Cl-form AV-17-2P anionite w as studied. It was found that both hydrochloric acid and the amino acids we re jointly sorbed by the ionite with the formation of ionic pairs containin g water molecules. The distribution of the amino acids in the anionite-solu tion systems was shown to proceed according to their ability to form interm olecular complexes in the ionite phase. With increasing temperature, the so rption values for HCl and tyrosine increase, whereas that for tryptophan de creases, a behavior that is associated with changes in the acid-base proper ties of the side groups of the molecules of the amino acids.