CELLULOSE ION-EXCHANGE ADSORBENTS 75 1 and back-titrated with hydrochloric acid, using brom thymol blue as indicator: equiv. wt., 125.The debenzylated polymer was dialyzed and treated as in section a; yield 4.6 g. The multichain polyglutamic acid was hydrolyzed and the hydrolysate analyzed chromato-(25) S. Ion-exchange adsorbents have been prepared from cellulose under conditions such that physical properties suitable forThese adsorbents possess high capacity for the adsorption of proteins, yet permit column chromatography are maintained. elution under mild conditions. Titration curves are presented.

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