Enzyme cascade methods for E-TRACE assay signal amplification
First Claim
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1. A method for detecting a target analyte in a test sample, said method comprising:
- (a) contacting a target specific enzyme, a recycling enzyme and a peroxide-generating enzyme with said target sample under conditions wherein a peroxide is generated in the presence of said target analyte to form an assay mixture;
(b) contacting the assay mixture with a first solid support comprising an electrode comprising a covalently attached electroactive moiety (EAM) having a first E0, said EAM comprising a transition metal complex comprising a self-immolative moiety (SIM) and a peroxide sensitive moiety (PSM), wherein said peroxide reacts with said PSM to release said SIM from said EAM and result in said EAM having a second E0;
(c) measuring the electrochemical properties of said EAM at the first E0 and at the second E0; and
(d) detecting for the presence or concentration of said target analyte from said electrochemical properties.
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Abstract
The disclosure also relates to novel methods for detection of biological targets using amplification steps in conjunction with conversion of functional groups attached to a transitional metal complex, resulting in quantifiable electrochemical signal at two unique potentials, E°1 and E°2.
92 Citations
29 Claims
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1. A method for detecting a target analyte in a test sample, said method comprising:
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(a) contacting a target specific enzyme, a recycling enzyme and a peroxide-generating enzyme with said target sample under conditions wherein a peroxide is generated in the presence of said target analyte to form an assay mixture; (b) contacting the assay mixture with a first solid support comprising an electrode comprising a covalently attached electroactive moiety (EAM) having a first E0, said EAM comprising a transition metal complex comprising a self-immolative moiety (SIM) and a peroxide sensitive moiety (PSM), wherein said peroxide reacts with said PSM to release said SIM from said EAM and result in said EAM having a second E0; (c) measuring the electrochemical properties of said EAM at the first E0 and at the second E0; and (d) detecting for the presence or concentration of said target analyte from said electrochemical properties. - View Dependent Claims (13, 14, 15, 16, 29)
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2. A method for detecting a target analyte in a test sample, said method comprising:
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(a) contacting said test sample with a first complex comprising a labeled target analyte pre-bound to a binding ligand, with said test sample under conditions wherein said target analyte from said test sample, if present, displaces said labeled target from said first complex forming a second complex, wherein said labeled target analyte is labeled with a first member of a specific binding pair; (b) contacting said second complex with an intermediary enzyme of a peroxide generating system comprising a labeled linker forming a third complex, wherein said labeled linker is labeled with a second member of said specific binding pair; (c) isolating said third complex; (d) contacting said third complex with a substrate for said intermediary enzyme of peroxide-generating system under conditions such that product(s) are generated to form a first assay mixture; (e) contacting a peroxide-generating enzyme and optionally a recycling enzyme with first assay mixture under conditions wherein peroxide is generated to form a second assay mixture; (f) contacting the second, assay mixture with a first solid support comprising an electrode comprising a covalently attached electroactive moiety (EAM) having a first E0, said EAM comprising a transition metal complex comprising a self-immolative moiety (SIM) and a peroxide sensitive moiety (PSM), wherein said peroxide reacts with said PSM to release said SIM from said EAM and result in said EAM having a second E0; (g) measuring the electrochemical properties of said EAM at the first E0 and at the second E0; and (h) detecting for the presence or the concentration of said target analyte from said electrochemical properties. - View Dependent Claims (3, 6, 7, 8, 9, 10, 11, 12, 17, 18, 19, 20, 21, 22, 23, 24, 25, 27)
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4. A method for detecting a target analyte in a test sample, said method comprising:
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(a) contacting a first binding ligand with said test sample under conditions wherein said first binding ligand binds said target analyte, if present, in said test sample to form a first complex; (b) contacting said first complex with a second binding ligand under conditions wherein said first complex and said second binding ligand bind to form a second complex, wherein said second binding ligand comprises an intermediary enzyme of a peroxide-generating system; (c) isolating said second complex; (d) contacting said second complex with a substrate for said intermediary enzyme of peroxide-generating system under conditions such that products are generated to form a first assay mixture; (e) contacting a peroxide-generating enzyme and optionally a recycling enzyme with a first assay mixture under conditions wherein peroxide is generated to form a second assay mixture; (f) contacting the second assay mixture with a first solid support comprising an electrode comprising a covalently attached electroactive moiety (EAM) having a first E0, said EAM comprising a transition metal complex comprising a self-immolative moiety (SIM) and a peroxide sensitive moiety (PSM), wherein said peroxide reacts with said PSM to release said SIM from said EAM and result in said EAM having a second E0; (g) measuring the electrochemical properties of said EAM at the first E0 and at the second E0; and (h) detecting for the presence or the concentration of said target analyte from said electrochemical properties. - View Dependent Claims (5, 26, 28)
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Specification