Method and device for detecting biomolecules
First Claim
1. A method for detecting a target biomolecule in a sample comprising a plurality of biomolecules, whereby the target biomolecule is provided directly or indirectly with a tag, which is linked to a signal generating agent comprising a catalytic active moiety which catalyses the transformation of an additional soluble species to an insoluble precipitate, said method comprising the steps of:
- a) providing a solid support with a plurality of spatially different locations arranged on its surface, whereby at least one location is electrically conducting and a plurality of individual flexible nanoelectrodes with probe biomolecule attached thereto being linked to said location,b) bringing the sample in contact with the solid support comprising said probe biomolecules, thereby the probe biomolecule and the target biomolecule interacting together,c) adding the soluble species,d) transforming the soluble species into the insoluble precipitate forming a deposit essentially on or at the nanoelectrodes, thereby decreasing the flexibility of the nanoelectrodese) measuring the electrical conductivity of the plurality of the nanoelectrodes at least one location, wherein a decrease in the flexibility of the electrode causes a decrease in the electrical conductivity to indicate the presence of the target biomolecule.
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Abstract
The present invention relates to a method for detecting a target biomolecule in a sample comprising a plurality of biomolecules, whereby the target biomolecule is provided with a tag, said tag comprising a catalytic active moiety which catalyses a reaction yielding an insoluble reaction product which precipitates on flexible electrically conductive nanoelectrodes. The precipitation onto said nanoelectrodes causes a change in their electroconductivity which is accessible to electroanalytical methods. The invention relates further to a biochip comprising a solid support with nanoelectrodes attached thereto and probe molecules bound to all or to a plurality of said nanoelectrodes which may be the same or different, a segment of said probe molecules being able to interact specifically with a segment of the target biomolecules.
15 Citations
19 Claims
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1. A method for detecting a target biomolecule in a sample comprising a plurality of biomolecules, whereby the target biomolecule is provided directly or indirectly with a tag, which is linked to a signal generating agent comprising a catalytic active moiety which catalyses the transformation of an additional soluble species to an insoluble precipitate, said method comprising the steps of:
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a) providing a solid support with a plurality of spatially different locations arranged on its surface, whereby at least one location is electrically conducting and a plurality of individual flexible nanoelectrodes with probe biomolecule attached thereto being linked to said location, b) bringing the sample in contact with the solid support comprising said probe biomolecules, thereby the probe biomolecule and the target biomolecule interacting together, c) adding the soluble species, d) transforming the soluble species into the insoluble precipitate forming a deposit essentially on or at the nanoelectrodes, thereby decreasing the flexibility of the nanoelectrodes e) measuring the electrical conductivity of the plurality of the nanoelectrodes at least one location, wherein a decrease in the flexibility of the electrode causes a decrease in the electrical conductivity to indicate the presence of the target biomolecule. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method for detecting a target biomolecule in a sample comprising a plurality of biomolecules, whereby the target biomolecule is provided directly or indirectly with a tag, which is linked to a signal generating agent comprising a catalytic active moiety which catalyses the transformation of an additional soluble species to an insoluble precipitate, said method comprising the steps of:
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a) providing a solid support with a plurality of spatially different locations arranged on its surface, whereby at least one location is electrically conducting and a plurality of individual flexible electropolymerized nanoelectrodes with probe biomolecule attached thereto being linked to said location, b) bringing the sample in contact with the solid support comprising said probe biomolecules, thereby the probe biomolecule and the target biomolecule interacting together, c) adding the soluble species, d) transforming the soluble species into the insoluble precipitate forming a deposit essentially on or at the nanoelectrodes, thereby decreasing the flexibility of the nanoelectrodes e) measuring the electrical conductivity of the plurality of the nanoelectrodes at least one location, wherein a decrease in the flexibility of the electrode causes a decrease in the electrical conductivity to indicate the presence of the target biomolecule.
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18. A method for detecting a target biomolecule in a sample comprising a plurality of biomolecules, whereby the target biomolecule is provided directly or indirectly with a tag, which is linked to a signal generating agent comprising a catalytic active moiety which catalyses the transformation of an additional soluble species to an insoluble precipitate, said method comprising the steps of:
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a) providing a solid support with a plurality of spatially different locations arranged on its surface, whereby at least one location is electrically conducting and a plurality of individual flexible nanoelectrodes, which nanoelectrodes are optionally substituted polypyrroles or copolymers thereof, with probe biomolecule attached thereto being linked to said location, b) bringing the sample in contact with the solid support comprising said probe biomolecules, thereby the probe biomolecule and the target biomolecule interacting together, c) adding the soluble species, d) transforming the soluble species into the insoluble precipitate forming a deposit essentially on or at the nanoelectrodes, thereby decreasing the flexibility of the nanoelectrodes e) measuring the electrical conductivity of the plurality of the nanoelectrodes at least one location, wherein a decrease in the flexibility of the electrode causes a decrease in the electrical conductivity to indicate the presence of the target biomolecule. - View Dependent Claims (19)
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Specification