Method for facilitating an automated isolation of a biopolymer using magnetic particles
First Claim
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1. A method for isolating a nucleic acid from an aqueous solution utilizing magnetic particles comprising the steps of:
- a) adding silica-coated magnetic particles to an aqueous solution comprising the nucleic acid in the presence of a salt and a hydratable additive, which is selected from the group consisting of ethylene glycol, tetraethylene glycol, polyalkylene glycol, cyclodextrin, carageenan, dextran, dextran sulfate, xanthan, cellulose, hydroxypropyl cellulose, amylose, 2-hydroxypropyl-β
-cyclodextrin, agar agar or a mixture thereof, wherein the concentration of the additive is in the range of from 2% (w/v) to 7% (w/v) and is selected to prevent substantial clustering of the magnetic particles during the performance of the method and wherein the concentration of the salt is sufficiently high to cause the nucleic acid to adhere to the particles but not so high as to substantially denature or degrade the nucleic acid or to cause the nucleic acid to precipitate,b) incubating the aqueous solution of step a) to allow the particles of step a) and the nucleic acid of step a) to adhere, reversibly bind or absorb to the particles of step (a),c) applying a magnetic field to said solution to separate the magnetic particles from said solution,d) optionally washing the separated magnetic particles of step c); and
e) exposing the magnetic particles from step (c) or (d) to an elution buffer under conditions in which said nucleic acid is eluted from said magnetic particles.
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Abstract
A method for isolating polynucleotides, such as DNA, RNA and hybrids thereof from an aqueous solution containing polynucleotides by reversibly binding the polynucleotides to silica-coated magnetic particles in the presence of a salt and non-ionic hydratable additive is disclosed. The salt and non-ionic hydratable additive concentrations are adjusted to levels that result in adhesion of the nucleic acid to the particles without degradation or precipitation of the nucleic acid.
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Citations
28 Claims
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1. A method for isolating a nucleic acid from an aqueous solution utilizing magnetic particles comprising the steps of:
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a) adding silica-coated magnetic particles to an aqueous solution comprising the nucleic acid in the presence of a salt and a hydratable additive, which is selected from the group consisting of ethylene glycol, tetraethylene glycol, polyalkylene glycol, cyclodextrin, carageenan, dextran, dextran sulfate, xanthan, cellulose, hydroxypropyl cellulose, amylose, 2-hydroxypropyl-β
-cyclodextrin, agar agar or a mixture thereof, wherein the concentration of the additive is in the range of from 2% (w/v) to 7% (w/v) and is selected to prevent substantial clustering of the magnetic particles during the performance of the method and wherein the concentration of the salt is sufficiently high to cause the nucleic acid to adhere to the particles but not so high as to substantially denature or degrade the nucleic acid or to cause the nucleic acid to precipitate,b) incubating the aqueous solution of step a) to allow the particles of step a) and the nucleic acid of step a) to adhere, reversibly bind or absorb to the particles of step (a), c) applying a magnetic field to said solution to separate the magnetic particles from said solution, d) optionally washing the separated magnetic particles of step c); and e) exposing the magnetic particles from step (c) or (d) to an elution buffer under conditions in which said nucleic acid is eluted from said magnetic particles. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. A kit for isolating a nucleic acid from an aqueous solution comprising at least:
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a) an aliquot of silica-coated magnetic particles suspended in an aqueous solution in a first container, b) a hydratable additive, a stock solution of a hydratable additive or a ready-for application solution of a hydratable additive, wherein said hydratable additive is selected from the group consisting of ethylene glycol, tetraethylene glycol, polyalkylene glycol, cyclodextrin, carageenan, dextran, dextran sulfate, xanthan, cellulose, hydroxypropyl cellulose, amylose, 2-hydroxypropyl-β
-cyclodextrin, agar agar and mixtures thereof, and/orc) a chaotropic or a non-chaotropic salt, a stock solution of a chaotropic or a non-chaotropic salt or a ready-for-application solution of a chaotropic or non-chaotropic salt. - View Dependent Claims (25, 26, 27, 28)
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Specification