title: Fractionation of outdated freeze-dried plasma: a comparative study of cold- and heat-ethanol fractionation procedures.
abstract: In a comparative study a total volume of 1435 kg outdated freeze-dried plasma, equivalent to approx. 200,000 kg liquid plasma, was fractionated into albumin (20%): about 30% of the total plasma volume was fractionated following the cold-ethanol procedure and about 70% following the heat-ethanol method. Average albumin recovery following cold-ethanol preparation was 47% of the albumin originally present in the freeze-dried plasma (= 50% of total protein); following heat-ethanol fractionation, 71%. Gelfiltration of heat-ethanol albumin showed a main peak (= 93%) representing albumin monomers and one slightly faster component (= 7%) representing albumin dimers. Gelfiltration of cold-ethanol isolated albumin on the other hand showed four peaks: albumin monomers (= 60%), albumin dimers (= 15%), and two other peaks representing higher molecular weight molecules (= 25%). Hemoglobin present in the reconstituted plasma was reduced about five-fold in the cold-ethanol product and about ten-fold in the heat-ethanol albumin. Stability tests of both products did not differ from equivalent products isolated from normal human plasma. Besides albumin, immunoglobulins may be isolated as Cohn fraction II-III prior to the heating procedure without significant albumin loss.
mesh_terms: D001771:Blood Banks; D003080:Cold Temperature; D000431:Ethanol / Q000494:pharmacology*; D005612:Freeze Drying; D006358:Hot Temperature; D006801:Humans; D010949:Plasma / Q000187:drug effects; D012709:Serum Albumin / Q000302:isolation & purification
chemical_list: D012709:Serum Albumin; D000431:Ethanol