摘要:
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. The thus obtained human serum albumin can further be purified by treating recombinant human serum albumin with a hydrophobic chromatography carrier at pH of 2 to 5 and a salt concentration of 0.4 to 1 and exposing the carrier to a pH of 6 to 8 and a salt concentration of 0.01 to 0.3 M, or treating the culture supernatant with boric acid or a salt thereof at pH 8 to 11 for 1 to 10 hours and recovering the supernatant. 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.
摘要:
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. The thus obtained human serum albumin can further be purified by treating recombinant human serum albumin with a hydrophobic chromatography carrier at pH of 2 to 5 and a salt concentration of 0.4 to 1 and exposing the carrier to a pH of 6 to 8 and a salt concentration of 0.01 to 0.3 M, or treating the culture supernatant with boric acid or a salt thereof at pH 8 to 11 for 1 to 10 hours and recovering the supernatant. 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.
摘要:
A method for decoloring a recombinant human serum albumin by treating the albumin with a reducing agent is disclosed. Also, a method for decoloring a recombinant human serum albumin by treating the albumin with a method removing free polysaccharides with a cation exchanger followed by heat treatment is disclosed. The present invention provides a recombinant human serum albumin, coloring of which is fully suppressed by preventing binding of certain coloring components, which are contained in the raw materials or contaminants secreted by a microorganism, to human serum albumin so as not to cause coloring of the human serum albumin.
摘要:
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.
摘要:
The invention provides a process for purifying recombinant human serum albumin (rHSA) by heating a-culture medium containing rHSA and the rHSA-producing host cells, feeding said heated solution upwardly into a fluidized bed in which adsorbent particles are suspended to effect contacting with the adsorbent particles and then recovering the adsorbed fraction containing the rHSA, and a composition comprising rHSA which shows a A350/A280 ratio of below 0.015, when formulated into a 25% solution of said albumin.
摘要:
The invention provides a process for purifying recombinant human serum albumin (rHSA) by heating a culture medium containing rHSA and the rHSA-producing host cello, feeding said heated solution upwardly into a fluidized bed in which adsorbent particles are suspended to effect contacting with the adsorbent particles and then recovering the adsorbed fraction containing the rHSA, and a composition comprising rHSA which shows a A35D/A280 ratio of below 0.015, when formulated into a 25% solution of said albumin.
摘要:
The present invention describes a process for activating Factor II to Factor II.sub.a by incubating Factor II in the presence of Factor V, Factor X.sub.a, phospholipids, and calcium ions. Each of the factors is prepared from a single impure protein fraction which includes Factors II, V and X. The Factor II, V and X purification procedure comprises the steps of DEAE ligand chromatography and precipitation by the addition of barium chloride. Factor V is recovered from the barium chloride supernatant, and Factors II and X are contained in the barium chloride precipitate. The barium chloride precipitate is dissolved in an aqueous solution and is applied to a chromatographic resin coupled with a ligand which binds Factor X and Factor II weakly or not at all. Factor II is recovered from the fraction, which remains unbound or weakly bound to the Factor X binding ligand. Factor X.sub.a is prepared by recovering Factor X from the ligand during the Factor II preparation procedure and activating the Factor X to Factor X.sub.a by specific proteolytic cleavage.
摘要:
An antibody provided by the present invention has a low reactivity with amyloid precursor proteins, and has a higher reactivity with amylospheroids than with amyloid β fibrils or monomeric amyloid β-proteins. According to the present invention, an antibody is provided that has a higher reactivity with amylospheroids than with amyloid precursor proteins, and has any one or more of the following properties: (i) a higher activity with amylospheroids than with amyloid β fibrils; (ii) a higher reactivity with amylospheroids than with monomeric amyloid β-proteins; and (iii) an activity of inhibiting neuronal cell death induced by amylospheroids.
摘要:
The objective of the present invention is to confer pest resistance to plants of Poaceae without using any chemically synthesized pesticides. The pest resistance can be conferred to plants of Poaceae by isolating from a natural plant an endophytic bacterium capable of expressing pest resistance, artificially culturing the endophytic bacterium, and introducing the bacteria to a Poaceae plant of interest.
摘要:
The present invention relates to a variety obtained by selecting and cross-breeding those individuals producing the insect resistance substance peramine from Glyceria ischyroneura Steud. growing wild in various districts of Japan.