Side Products of Routine Plasma Fractionation

Abstract
Cholinesterase (EC 3.1.1.8) for intravenous use has been obtained from fraction IV, a by‐product of ethanol fractionation. A four‐step procedure has been developed associating precipitation by Rivanol® and PEG 4000 with chromatography on DEAE‐cellulose. The yield corresponds to 30–35% of the activity found in fraction IV. Vials containing 5000 U of CHE stabilized by 2.5% albumin have been prepared. The pyrogen‐free product is well tolerated in the human.