Isolation of lactoferrin from milk
First Claim
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1. A method for substantially purifying human lactoferrin from milk, comprising the steps of:
- contacting milk or a milk fraction containing human lactoferrin with a strong cation exchange resin under elevated ionic strength conditions which are at least 10 mM higher in monovalent cation concentration than milk for a binding period forming human lactoferrin-resin complexes;
removing the milk or milk fraction which remains unbound and recovering the human lactoferrin-resin complexes; and
eluting the human lactoferrin from the recovered human lactoferrin-resin complexes with a salt solution having an ionic strength sufficient to elute the human lactoferrin from the human lactoferrin-resin complexes.
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Abstract
The invention provides methods for purification of human lactoferrin from milk, especially milk of nonhuman species, and for separation of human lactoferrin from undesired macromolecular species present in the milk, including separation from nonhuman lactoferrin species.
78 Citations
27 Claims
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1. A method for substantially purifying human lactoferrin from milk, comprising the steps of:
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contacting milk or a milk fraction containing human lactoferrin with a strong cation exchange resin under elevated ionic strength conditions which are at least 10 mM higher in monovalent cation concentration than milk for a binding period forming human lactoferrin-resin complexes; removing the milk or milk fraction which remains unbound and recovering the human lactoferrin-resin complexes; and eluting the human lactoferrin from the recovered human lactoferrin-resin complexes with a salt solution having an ionic strength sufficient to elute the human lactoferrin from the human lactoferrin-resin complexes. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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- 16. A method for purifying native human lactoferrin from hLF degradation products in a sample, comprising the step of contacting the sample with a strong cation exchange resin under binding conditions and eluting the native human lactoferrin as a resolvable peak by applying a salt gradient or in a stepwise mode and recovering the peak consisting essentially of native human lactoferrin having an intact amino terminal sequence.
- 19. A method for separating human lactoferrin from bovine lactoferrin in a sample, comprising contacting the sample with a strong cation exchange resin and eluting the human lactoferrin from the resin with a salt solution which preferentially elutes human lactoferrin but does not substantially elute bovine lactoferrin concomitantly with the human lactoferrin.
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23. A method for isolating substantially pure recombinant human lactoferrin from the milk of a transgenic animal harboring a transgene which encodes the expression and secretion of recombinant human lactoferrin in its milk, comprising the steps of:
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obtaining milk or a milk fraction of said transgenic animal containing recombinant human lactoferrin; contacting said milk or milk fraction with a strong cation exchange resin under conditions for binding of the human lactoferrin to the resin; eluting the recombinant human lactoferrin from the strong cation exchange resin with a stepwise salt gradient or linear salt gradient. - View Dependent Claims (24, 25)
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- 26. A method for removing LPS from a solution, comprising the step of contacting a solution containing LPS with a resin comprising immobilized hLF and recovering the portion of the solution that is bound to the resin comprising immobilized hLF.
Specification