Abstract: A method for highly purifying human serum albumin (HSA), which comprises bringing a fraction containing HSA produced by genetic engineering into contact with a chelating chromatography carrier bound with copper ions, and eluting the HSA adsorbed by the carrier with a buffer containing ammonium chloride as an atagonist and having a pH of about 5-7.According to the method of the present invention, a component derived from yeast, which cannot be sufficiently removed by conventional purification methods for HSA produced by genetic engineering, can be removed from HSA produced by genetic engineering, and a highly purified HSA can be provided.

Abstract: Human serum albumin obtained by gene manipulation techniques can be purified by a combination of specified steps in which a culture supernatant obtained from a human serum albumin-producing host is subjected to ultrafiltration, heat treatment, acid treatment and another ultrafiltration, followed by subsequent treatments with a cation exchanger, a hydrophobic chromatography carrier and an anion exchanger, and by salting-out to thereby obtain a pure form of human serum albumin which contains substantially no proteinous and polysaccharide contaminants, which is formulated into a pharmaceutical preparation. This process makes it possible to effeciently purify recombinant human serum albumin and to provide substantially pure human serum albumin which does not contain producer host-related substances and other contaminants and is sufficiently free from coloration.

Abstract: A method of inhibiting the coloration of human serum albumin expressed by using the gene manipulation technology which method comprises separating coloring contaminants from said human serum albumin before said coloring contaminants bind to the human serum albumin.