title: A general method for the isolation of haptoglobin 1-1, 2-1, and 2-2 from human plasma.
abstract: A general method for the isolation of haptoglobin 1-1, 2-1, and 2-2 human plasma is described. Plasma is fractionated by affinity chromatography on chicken hemoglobin-Sepharose using the full capacity of the column; then after washing the column thoroughly, haptoglobin is eluted with 8 M urea and the eluate is collected in fractions to separate active and denatured haptoglobin. The urea-free, active fractions of haptoglobin are fractionated by affinity chromatography on Affi-Gel Con A to remove nonglycoproteins, principally apolipoprotein A-I, and the haptoglobin is eluted with 0.5 M glucose. Then the haptoglobin-containing fractions are fractionated by negative immunoadsorption chromatography on anti-chicken hemoglobin-protein A-Sepharose to remove chicken hemoglobin-human haptoglobin complexes. Haptoglobin prepared by this three-step procedure is biologically active and nearly homogeneous. The recovery is approximately 70%, irrespective of phenotype. The procedure can be completed in 3 days. A partial purification of apolipoprotein A-I is obtained simultaneously by this method.
mesh_terms: D000818:Animals; D002645:Chickens; D002846:Chromatography, Affinity / Q000379:methods; D006242:Haptoglobins / Q000302:isolation & purification*; D006454:Hemoglobins; D006801:Humans; D012685:Sepharose
chemical_list: D006242:Haptoglobins; D006454:Hemoglobins; D012685:Sepharose