Electrochemical assay for the detection of enzymes
First Claim
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1. A method for detecting for the presence of a protease in a test sample, said method comprising:
- (a) adding a test sample to a solid support comprising an electrode comprising;
(i) a self-assembled monolayer (SAM);
(ii) a covalently attached electroactive active moiety (EAM) comprising a transition metal complex with an E0, wherein said EAM comprises a ferrocene; and
(iii) a plurality of proteins attached to said electrode, wherein said proteins are arranged so that the EAM is at least partially shielded by the proteins from exposure to a solution and comprise a cleavage site of said protease, wherein the cleavage site is near the height of said EAM;
(b) cleaving a plurality of said proteins with said protease, if said protease is present, such that when the proteins are cleaved at the cleavage site, the EAM is exposed to the solution; and
(c) determining the presence of said protease by measuring a change of said E0.
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Abstract
The invention relates to novel compositions and methods for the detection of enzymes using the nuclear reorganization energy, λ, of an electron transfer process.
36 Citations
14 Claims
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1. A method for detecting for the presence of a protease in a test sample, said method comprising:
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(a) adding a test sample to a solid support comprising an electrode comprising; (i) a self-assembled monolayer (SAM); (ii) a covalently attached electroactive active moiety (EAM) comprising a transition metal complex with an E0, wherein said EAM comprises a ferrocene; and (iii) a plurality of proteins attached to said electrode, wherein said proteins are arranged so that the EAM is at least partially shielded by the proteins from exposure to a solution and comprise a cleavage site of said protease, wherein the cleavage site is near the height of said EAM; (b) cleaving a plurality of said proteins with said protease, if said protease is present, such that when the proteins are cleaved at the cleavage site, the EAM is exposed to the solution; and (c) determining the presence of said protease by measuring a change of said E0. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for detecting for the presence of a protease in a test sample, said method comprising:
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(a) adding a test sample to a solid support comprising an electrode, said electrode comprising; (i) a self-assembled monolayer (SAM); (ii) a covalently attached electroactive active moiety (EAM) comprising a transition metal complex with an E0, wherein said EAM comprises osmium and at least one cyano ligand; and (iii) a plurality of proteins attached to said electrode, wherein said proteins are arranged so that the EAM is at least partially shielded by the proteins from exposure to a solution and comprises a cleavage site of said protease, wherein the cleavage site is near the height of said EAM; (b) cleaving a plurality of said proteins with said protease, if the protease is present, such that when the proteins are cleaved at the cleavage site, the EAM is exposed to the solution; and (c) determining the presence of said protease by measuring a change of said E0. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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Specification