Chromatography stationary phase material for high performance liquid chromatography
First Claim
1. A method for converting agarose beads with pores filled with an aqueous medium and of sufficient porosity to be permeable to proteins, to beads of sufficiently low porosity to be substantially impermeable to proteins, said method comprising:
- (a) treating said agarose beads with a first organic solvent in which agarose is soluble but which promotes swelling of agarose, to weaken the agarose while retaining said agarose in the form of beads;
(b) replacing substantially all of said first organic solvent and any remaining water in said agarose beads with a second organic solvent which neither dissolves nor swells the agarose to cause the pores of said agarose beads to at least partially collapse, thereby imparting to said beads a reduced porosity;
(c) placing an agarose crosslinking agent inside the pores of said beads; and
(d) causing said crosslinking agent to crosslink the agarose inside said pores to fix said reduced porosity.
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Accused Products
Abstract
Highly compressible chromatographic stationary phase particles such as agarose beads are made rigid to a degree suitable for use in HPLC, and nonporous to proteins by one of two procedures. The first involves shrinking the beads with the use of an organic solvent in which the agarose bead will neither dissolve nor swell to collapse the porosity, followed by crosslinking the bead surfaces inside the collapsed pores to fix the pores in their collapsed state. The second involves filling the pores (without shrinkage of the beads) with a polymerizable substance which grafts to the pore surface, and performing the graft polymerization. The invention also extends to rigid beads, which are rendered deformable to a limited degree by coating the surface with a polymer. Finally, porous rigid beads are rendered nonporous by polymerizing a polymerizable material inside the pores in the same manner as the porous compressible beads.
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Citations
12 Claims
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1. A method for converting agarose beads with pores filled with an aqueous medium and of sufficient porosity to be permeable to proteins, to beads of sufficiently low porosity to be substantially impermeable to proteins, said method comprising:
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(a) treating said agarose beads with a first organic solvent in which agarose is soluble but which promotes swelling of agarose, to weaken the agarose while retaining said agarose in the form of beads; (b) replacing substantially all of said first organic solvent and any remaining water in said agarose beads with a second organic solvent which neither dissolves nor swells the agarose to cause the pores of said agarose beads to at least partially collapse, thereby imparting to said beads a reduced porosity; (c) placing an agarose crosslinking agent inside the pores of said beads; and (d) causing said crosslinking agent to crosslink the agarose inside said pores to fix said reduced porosity. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification