Method for detecting and quantitating nucleic acid impurities in biochemical preparations
First Claim
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1. A process for detecting and quantitating an amount of a nucleic acid in a protein solution, comprising:
- a) measuring at least one light-emitting characteristic of a plurality of test solutions, each having a different known amount of nucleic acid and each having a nucleic acid detecting label;
b) forming a curve based on the light-emitting characteristic measurements of step a);
c) adding the label to a sample of the protein solution having a detergent and measuring at least one light-emitting characteristic from the sample; and
,d) comparing the light-emitting characteristic measurements of step c) with the curve and determining the amount of nucleic acid in the sample.
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Abstract
A homogeneous fluorescence-based nucleic acid detection and quantitation system is provided to measure nucleic acid in protein solutions. The process relies on the intercalation of a non-fluorescent dye into a double-stranded nucleic acid helix or single-stranded nucleic acid. The dye fluoresces after intercalation and the intensity is a direct measurement of the amount of nucleic acid present in the sample.
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Citations
13 Claims
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1. A process for detecting and quantitating an amount of a nucleic acid in a protein solution, comprising:
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a) measuring at least one light-emitting characteristic of a plurality of test solutions, each having a different known amount of nucleic acid and each having a nucleic acid detecting label; b) forming a curve based on the light-emitting characteristic measurements of step a); c) adding the label to a sample of the protein solution having a detergent and measuring at least one light-emitting characteristic from the sample; and
,d) comparing the light-emitting characteristic measurements of step c) with the curve and determining the amount of nucleic acid in the sample. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 11)
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9. A process for monitoring nucleic acid removal during recombinant protein manufacture, comprising:
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a) adding a detergent to a sample of protein solution in the presence of a purified assay buffer; b) adding a dye that strongly emits fluorescence when intercalating with double-stranded DNA; c) measuring an intensity from the dye; d) comparing the intensity from step c) with a curve for obtaining a quantity of DNA present in the sample. - View Dependent Claims (10)
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12. A kit for detecting and quantitating an amount of nucleic acid present in a protein sample, comprising:
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a) a receptacle containing a chemical label for detecting and quantitating an amount of nucleic acid present in a sample; b) a receptacle containing a purified assay buffer; c) a receptacle containing a nucleic acid standard for forming a curve; and
,d) a receptacle containing a detergent for preventing nucleic acid binding to protein. - View Dependent Claims (13)
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Specification