System and method for electrochemical detection of biological compounds
First Claim
1. An electrochemical method for detecting a target polynucleotide, comprising:
- obtaining a first electrochemical signal, a portion of the first electrochemical signal arising from a first amount of a probe molecule reversibly immobilized on an electrode and not intercalated with the target polynucleotide;
increasing or decreasing an amount of the target polynucleotide in fluid communication with the first amount of the probe molecule, wherein the probe molecule preferentially associates with the target polynucleotide over the electrode;
obtaining a second electrochemical signal, a portion of the second electrochemical signal arising from a second amount of the probe molecule reversibly immobilized on the electrode and not intercalated with the target polynucleotide; and
determining a difference between the first and second electrochemical signals.
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Abstract
The present invention relates to an electrochemical method for detecting a target polynucleotide. An electrode comprising an electrode surface is provided. The electrode surface includes at least one probe molecule reversibly immobilized with respect to the electrode surface. A first electrochemical signal indicative of an amount of probe molecule immobilized with respect to the electrode surface is obtained. The electrode surface is contacted with a liquid comprising the target polynucleotide. Upon the contacting step, at least some of the probe molecule immobilized with respect to the electrode surface dissociates therefrom. A second electrochemical signal indicative of an amount of probe molecule immobilized with respect to the electrode surface is obtained. The presence of the target polynucleotide is determined at least partially on the basis of the first and second electrochemical signals.
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Citations
18 Claims
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1. An electrochemical method for detecting a target polynucleotide, comprising:
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obtaining a first electrochemical signal, a portion of the first electrochemical signal arising from a first amount of a probe molecule reversibly immobilized on an electrode and not intercalated with the target polynucleotide; increasing or decreasing an amount of the target polynucleotide in fluid communication with the first amount of the probe molecule, wherein the probe molecule preferentially associates with the target polynucleotide over the electrode; obtaining a second electrochemical signal, a portion of the second electrochemical signal arising from a second amount of the probe molecule reversibly immobilized on the electrode and not intercalated with the target polynucleotide; and determining a difference between the first and second electrochemical signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification